diff --git a/kola/_helper.h b/kola/_helper.h
index 39eda36..5224ca5 100644
--- a/kola/_helper.h
+++ b/kola/_helper.h
@@ -9,7 +9,7 @@
 extern "C" {
 #endif
 
-enum TokenSyn {
+static enum TokenSyn {
     CMD=1, CMD_N, TEXT, LITERAL, STRING, NUM, NUM_H, NUM_B, NUM_F, CLN, CMA, SLP, SRP
 } TokenSyn;
 
@@ -57,6 +57,10 @@ static const char* get_format(int code) {
     {
     case 1:
         ERR_MSG(unknown symbol '%s');
+    case 2:
+        ERR_MSG(command '%s' not found);
+    case 3:
+        ERR_MSG(an error occured during handling command '%s');
     case 10:
         ERR_MSG(end of line in incurrect place);
     case 28:
@@ -80,42 +84,85 @@ static const char* get_format(int code) {
 #include "frameobject.h"
 // For Cython limiting, error setting function has to define here 
 static void __inline kola_set_error(PyObject* exc_type, int errorno,
-                            const char* filename, int lineno, char* text) 
+                            const char* filename, int lineno, const char* text) 
 {
     PyErr_Format(exc_type, get_format(errorno), errorno, text);
 
     // add traceback in .kola file
-#if PY_VERSION_HEX >= 0x03080000
-    _PyTraceback_Add("<kola>", filename, lineno);
-#else
-    PyCodeObject* code = NULL;
-    PyFrameObject* frame = NULL;
-    PyObject* globals = NULL;
-    PyObject *exc, *val, *tb;
+    #if PY_VERSION_HEX >= 0x03080000
+        _PyTraceback_Add("<kola>", filename, lineno);
+    #else
+        PyCodeObject* code = NULL;
+        PyFrameObject* frame = NULL;
+        PyObject* globals = NULL;
+        PyObject *exc, *val, *tb;
+
+        PyErr_Fetch(&exc, &val, &tb);
+
+        globals = PyDict_New();
+        if (!globals) goto end;
+        code = PyCode_NewEmpty(filename, "<kola>", lineno);
+        if (!code) goto end;
+        frame = PyFrame_New(
+            PyThreadState_Get(),
+            code,
+            globals,
+            NULL
+        );
+        if (!frame) goto end;
+
+        frame->f_lineno = lineno;
+        PyErr_Restore(exc, val, tb);
+        PyTraceBack_Here(frame);
+
+    end:
+        Py_XDECREF(code);
+        Py_XDECREF(frame);
+        Py_XDECREF(globals);
+    #endif
+}
 
+static void __inline kola_set_errcause(PyObject* exc_type, int errorno,
+                            const char* filename, int lineno, const char* text, PyObject* cause) 
+{
+    PyErr_Format(exc_type, get_format(errorno), errorno, text);
+    
+    PyObject *exc, *val, *tb;
     PyErr_Fetch(&exc, &val, &tb);
-
-    globals = PyDict_New();
-    if (!globals) goto end;
-    code = PyCode_NewEmpty(filename, "<kola>", lineno);
-    if (!code) goto end;
-    frame = PyFrame_New(
-        PyThreadState_Get(),
-        code,
-        globals,
-        NULL
-    );
-    if (!frame) goto end;
-
-    frame->f_lineno = lineno;
-    PyErr_Restore(exc, val, tb);
-    PyTraceBack_Here(frame);
-
-end:
-    Py_XDECREF(code);
-    Py_XDECREF(frame);
-    Py_XDECREF(globals);
-#endif
+    if (cause == Py_None) {
+        PyException_SetContext(val, NULL);
+    } else {
+        Py_INCREF(cause);
+        PyException_SetCause(val, cause);
+    }
+    #if PY_VERSION_HEX >= 0x03080000
+        PyErr_Restore(exc, val, tb);
+        _PyTraceback_Add("<kola>", filename, lineno);
+    #else
+        PyCodeObject* code = NULL;
+        PyFrameObject* frame = NULL;
+        PyObject* globals = NULL;
+        globals = PyDict_New();
+        if (!globals) goto end;
+        code = PyCode_NewEmpty(filename, "<kola>", lineno);
+        if (!code) goto end;
+        frame = PyFrame_New(
+            PyThreadState_Get(),
+            code,
+            globals,
+            NULL
+        );
+        if (!frame) goto end;
+
+        frame->f_lineno = lineno;
+        PyErr_Restore(exc, val, tb);
+        PyTraceBack_Here(frame);
+
+    end:
+        Py_XDECREF(code);
+        Py_XDECREF(frame);
+        Py_XDECREF(globals);
+    #endif
 }
 #endif
 
diff --git a/kola/_helper.pxd b/kola/_helper.pxd
index f7f7ac7..d45e372 100644
--- a/kola/_helper.pxd
+++ b/kola/_helper.pxd
@@ -16,4 +16,5 @@ cdef extern from "_helper.h":
         SLP
         SRP
     const uint8_t yy_goto[7][8]
-    void kola_set_error(object exc_type, int errorno, const char* filename, int lineno, char* text) except *
+    void kola_set_error(object exc_type, int errorno, const char* filename, int lineno, const char* text) except *
+    void kola_set_errcause(object exc_type, int errorno, const char* filename, int lineno, const char* text, object cause) except *
diff --git a/kola/klvm.py b/kola/klvm.py
index e73fa81..d2b37e8 100644
--- a/kola/klvm.py
+++ b/kola/klvm.py
@@ -1,6 +1,4 @@
-from argparse import ArgumentParser
-import sys
-from typing import Any, Callable, Dict, List, Optional, Tuple, Union
+from typing import Any, Callable, Dict, Set, Tuple, Union
 from types import MethodType
 from .lexer import BaseLexer, StringLexer, FileLexer
 from .parser import Parser
@@ -24,10 +22,13 @@ class KoiLangMeta(type):
     """
     Metaclass for KoiLang class
     """
-    __command_field__: List[KoiLangCommand]
+    __command_field__: Set[KoiLangCommand]
 
     def __new__(cls, name: str, base: Tuple[type, ...], attr: Dict[str, Any]):
-        __command_field__ = [i for i in attr.values() if isinstance(i, KoiLangCommand)]
+        __command_field__ = {i for i in attr.values() if isinstance(i, KoiLangCommand)}
+        for i in base:
+            if isinstance(i, KoiLangMeta):
+                __command_field__.update(i.__command_field__)
         attr["__command_field__"] = __command_field__
 
         return super().__new__(cls, name, base, attr)
@@ -54,20 +55,20 @@ def parse(self, lexer: Union[BaseLexer, str]) -> None:
         Parser(lexer, self.command_set).exec_()
     
     def parse_file(self, path: str) -> None:
-        Parser(FileLexer(path), self.command_set).exec_()
+        self.parse(FileLexer(path))
     
     def parse_command(self, cmd: str) -> None:
-        Parser(StringLexer(cmd, stat=1), self.command_set).exec_()
+        self.parse(StringLexer(cmd, stat=1))
     
     def parse_args(self, args: str) -> Tuple[tuple, dict]:
         return Parser(StringLexer(args, stat=2), self.command_set).parse_args()
 
 
-def kola_command(func: Callable) -> KoiLangCommand:
+def kola_command(func: Callable[..., Any]) -> KoiLangCommand:
     return KoiLangCommand(func.__name__, func)
 
-def kola_text(func: Callable) -> KoiLangCommand:
+def kola_text(func: Callable[[Any, str], Any]) -> KoiLangCommand:
     return KoiLangCommand("@text", func)
 
-def kola_number(func: Callable) -> KoiLangCommand:
+def kola_number(func: Callable[..., Any]) -> KoiLangCommand:
     return KoiLangCommand("@number", func)
\ No newline at end of file
diff --git a/kola/parser.c b/kola/parser.c
index 0817d8c..3c721fa 100644
--- a/kola/parser.c
+++ b/kola/parser.c
@@ -1781,16 +1781,6 @@ static int __Pyx__GetException(PyThreadState *tstate, PyObject **type, PyObject
 static int __Pyx_GetException(PyObject **type, PyObject **value, PyObject **tb);
 #endif
 
-/* PyUnicode_Unicode.proto */
-static CYTHON_INLINE PyObject* __Pyx_PyUnicode_Unicode(PyObject *obj);
-
-/* JoinPyUnicode.proto */
-static PyObject* __Pyx_PyUnicode_Join(PyObject* value_tuple, Py_ssize_t value_count, Py_ssize_t result_ulength,
-                                      Py_UCS4 max_char);
-
-/* RaiseException.proto */
-static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb, PyObject *cause);
-
 /* FastTypeChecks.proto */
 #if CYTHON_COMPILING_IN_CPYTHON
 #define __Pyx_TypeCheck(obj, type) __Pyx_IsSubtype(Py_TYPE(obj), (PyTypeObject *)type)
@@ -1816,6 +1806,9 @@ static CYTHON_INLINE void __Pyx__ExceptionSwap(PyThreadState *tstate, PyObject *
 static CYTHON_INLINE void __Pyx_ExceptionSwap(PyObject **type, PyObject **value, PyObject **tb);
 #endif
 
+/* RaiseException.proto */
+static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb, PyObject *cause);
+
 /* GetAttr3.proto */
 static CYTHON_INLINE PyObject *__Pyx_GetAttr3(PyObject *, PyObject *, PyObject *);
 
@@ -2302,14 +2295,12 @@ int __pyx_module_is_main_kola__parser = 0;
 static PyObject *__pyx_builtin_KeyError;
 static PyObject *__pyx_builtin_StopIteration;
 /* #### Code section: string_decls ### */
-static const char __pyx_k_[] = "'";
+static const char __pyx_k_[] = ".";
 static const char __pyx_k_n[] = "n";
-static const char __pyx_k__2[] = ".";
 static const char __pyx_k_gc[] = "gc";
-static const char __pyx_k__16[] = "?";
+static const char __pyx_k__15[] = "?";
 static const char __pyx_k_new[] = "__new__";
 static const char __pyx_k_pop[] = "pop";
-static const char __pyx_k_None[] = "None";
 static const char __pyx_k_dict[] = "__dict__";
 static const char __pyx_k_exec[] = "exec_";
 static const char __pyx_k_main[] = "__main__";
@@ -2328,7 +2319,6 @@ static const char __pyx_k_number[] = "@number";
 static const char __pyx_k_pickle[] = "pickle";
 static const char __pyx_k_reduce[] = "__reduce__";
 static const char __pyx_k_update[] = "update";
-static const char __pyx_k_command[] = "command '";
 static const char __pyx_k_disable[] = "disable";
 static const char __pyx_k_KeyError[] = "KeyError";
 static const char __pyx_k_getstate[] = "__getstate__";
@@ -2337,7 +2327,6 @@ static const char __pyx_k_setstate[] = "__setstate__";
 static const char __pyx_k_exception[] = "exception";
 static const char __pyx_k_exec_once[] = "exec_once";
 static const char __pyx_k_isenabled[] = "isenabled";
-static const char __pyx_k_not_found[] = "' not found";
 static const char __pyx_k_pyx_state[] = "__pyx_state";
 static const char __pyx_k_reduce_ex[] = "__reduce_ex__";
 static const char __pyx_k_Parser_pop[] = "Parser.pop";
@@ -2369,7 +2358,6 @@ static const char __pyx_k_pyx_unpickle_Parser[] = "__pyx_unpickle_Parser";
 static const char __pyx_k_Parser___reduce_cython[] = "Parser.__reduce_cython__";
 static const char __pyx_k_Parser___setstate_cython[] = "Parser.__setstate_cython__";
 static const char __pyx_k_Incompatible_checksums_s_vs_0x26[] = "Incompatible checksums (%s vs 0x266c945 = (command_set, lexer, stack_top, stat, t_cache))";
-static const char __pyx_k_an_error_occured_during_handling[] = "an error occured during handling command '";
 #if !CYTHON_USE_MODULE_STATE
 static PyObject *__pyx_kp_u_;
 static PyObject *__pyx_kp_s_Incompatible_checksums_s_vs_0x26;
@@ -2377,7 +2365,6 @@ static PyObject *__pyx_n_s_KeyError;
 static PyObject *__pyx_n_s_KoiLangCommandError;
 static PyObject *__pyx_n_s_KoiLangError;
 static PyObject *__pyx_n_s_KoiLangSyntaxError;
-static PyObject *__pyx_kp_u_None;
 static PyObject *__pyx_n_s_Parser;
 static PyObject *__pyx_n_s_Parser___reduce_cython;
 static PyObject *__pyx_n_s_Parser___setstate_cython;
@@ -2388,12 +2375,9 @@ static PyObject *__pyx_n_s_Parser_pop;
 static PyObject *__pyx_n_s_Parser_push;
 static PyObject *__pyx_n_s_PickleError;
 static PyObject *__pyx_n_s_StopIteration;
-static PyObject *__pyx_n_s__16;
-static PyObject *__pyx_kp_u__2;
-static PyObject *__pyx_kp_u_an_error_occured_during_handling;
+static PyObject *__pyx_n_s__15;
 static PyObject *__pyx_n_s_asyncio_coroutines;
 static PyObject *__pyx_n_s_cline_in_traceback;
-static PyObject *__pyx_kp_u_command;
 static PyObject *__pyx_n_s_command_set;
 static PyObject *__pyx_n_s_dict;
 static PyObject *__pyx_n_s_dict_2;
@@ -2414,7 +2398,6 @@ static PyObject *__pyx_n_s_main;
 static PyObject *__pyx_n_s_n;
 static PyObject *__pyx_n_s_name;
 static PyObject *__pyx_n_s_new;
-static PyObject *__pyx_kp_u_not_found;
 static PyObject *__pyx_kp_u_number;
 static PyObject *__pyx_n_s_parse_args;
 static PyObject *__pyx_n_s_pickle;
@@ -2460,19 +2443,19 @@ static PyObject *__pyx_tp_new_4kola_6parser_Parser(PyTypeObject *t, PyObject *a,
 static PyObject *__pyx_int_40290629;
 #endif
 #if !CYTHON_USE_MODULE_STATE
-static PyObject *__pyx_tuple__3;
-static PyObject *__pyx_tuple__5;
-static PyObject *__pyx_tuple__10;
-static PyObject *__pyx_tuple__12;
-static PyObject *__pyx_tuple__14;
-static PyObject *__pyx_codeobj__4;
+static PyObject *__pyx_tuple__2;
+static PyObject *__pyx_tuple__4;
+static PyObject *__pyx_tuple__9;
+static PyObject *__pyx_tuple__11;
+static PyObject *__pyx_tuple__13;
+static PyObject *__pyx_codeobj__3;
+static PyObject *__pyx_codeobj__5;
 static PyObject *__pyx_codeobj__6;
 static PyObject *__pyx_codeobj__7;
 static PyObject *__pyx_codeobj__8;
-static PyObject *__pyx_codeobj__9;
-static PyObject *__pyx_codeobj__11;
-static PyObject *__pyx_codeobj__13;
-static PyObject *__pyx_codeobj__15;
+static PyObject *__pyx_codeobj__10;
+static PyObject *__pyx_codeobj__12;
+static PyObject *__pyx_codeobj__14;
 #endif
 /* #### Code section: late_includes ### */
 /* #### Code section: module_state ### */
@@ -2505,7 +2488,6 @@ typedef struct {
   PyObject *__pyx_n_s_KoiLangCommandError;
   PyObject *__pyx_n_s_KoiLangError;
   PyObject *__pyx_n_s_KoiLangSyntaxError;
-  PyObject *__pyx_kp_u_None;
   PyObject *__pyx_n_s_Parser;
   PyObject *__pyx_n_s_Parser___reduce_cython;
   PyObject *__pyx_n_s_Parser___setstate_cython;
@@ -2516,12 +2498,9 @@ typedef struct {
   PyObject *__pyx_n_s_Parser_push;
   PyObject *__pyx_n_s_PickleError;
   PyObject *__pyx_n_s_StopIteration;
-  PyObject *__pyx_n_s__16;
-  PyObject *__pyx_kp_u__2;
-  PyObject *__pyx_kp_u_an_error_occured_during_handling;
+  PyObject *__pyx_n_s__15;
   PyObject *__pyx_n_s_asyncio_coroutines;
   PyObject *__pyx_n_s_cline_in_traceback;
-  PyObject *__pyx_kp_u_command;
   PyObject *__pyx_n_s_command_set;
   PyObject *__pyx_n_s_dict;
   PyObject *__pyx_n_s_dict_2;
@@ -2542,7 +2521,6 @@ typedef struct {
   PyObject *__pyx_n_s_n;
   PyObject *__pyx_n_s_name;
   PyObject *__pyx_n_s_new;
-  PyObject *__pyx_kp_u_not_found;
   PyObject *__pyx_kp_u_number;
   PyObject *__pyx_n_s_parse_args;
   PyObject *__pyx_n_s_pickle;
@@ -2568,19 +2546,19 @@ typedef struct {
   PyObject *__pyx_n_s_update;
   PyObject *__pyx_n_s_use_setstate;
   PyObject *__pyx_int_40290629;
-  PyObject *__pyx_tuple__3;
-  PyObject *__pyx_tuple__5;
-  PyObject *__pyx_tuple__10;
-  PyObject *__pyx_tuple__12;
-  PyObject *__pyx_tuple__14;
-  PyObject *__pyx_codeobj__4;
+  PyObject *__pyx_tuple__2;
+  PyObject *__pyx_tuple__4;
+  PyObject *__pyx_tuple__9;
+  PyObject *__pyx_tuple__11;
+  PyObject *__pyx_tuple__13;
+  PyObject *__pyx_codeobj__3;
+  PyObject *__pyx_codeobj__5;
   PyObject *__pyx_codeobj__6;
   PyObject *__pyx_codeobj__7;
   PyObject *__pyx_codeobj__8;
-  PyObject *__pyx_codeobj__9;
-  PyObject *__pyx_codeobj__11;
-  PyObject *__pyx_codeobj__13;
-  PyObject *__pyx_codeobj__15;
+  PyObject *__pyx_codeobj__10;
+  PyObject *__pyx_codeobj__12;
+  PyObject *__pyx_codeobj__14;
 } __pyx_mstate;
 
 #ifdef __cplusplus
@@ -2629,7 +2607,6 @@ static int __pyx_m_clear(PyObject *m) {
   Py_CLEAR(clear_module_state->__pyx_n_s_KoiLangCommandError);
   Py_CLEAR(clear_module_state->__pyx_n_s_KoiLangError);
   Py_CLEAR(clear_module_state->__pyx_n_s_KoiLangSyntaxError);
-  Py_CLEAR(clear_module_state->__pyx_kp_u_None);
   Py_CLEAR(clear_module_state->__pyx_n_s_Parser);
   Py_CLEAR(clear_module_state->__pyx_n_s_Parser___reduce_cython);
   Py_CLEAR(clear_module_state->__pyx_n_s_Parser___setstate_cython);
@@ -2640,12 +2617,9 @@ static int __pyx_m_clear(PyObject *m) {
   Py_CLEAR(clear_module_state->__pyx_n_s_Parser_push);
   Py_CLEAR(clear_module_state->__pyx_n_s_PickleError);
   Py_CLEAR(clear_module_state->__pyx_n_s_StopIteration);
-  Py_CLEAR(clear_module_state->__pyx_n_s__16);
-  Py_CLEAR(clear_module_state->__pyx_kp_u__2);
-  Py_CLEAR(clear_module_state->__pyx_kp_u_an_error_occured_during_handling);
+  Py_CLEAR(clear_module_state->__pyx_n_s__15);
   Py_CLEAR(clear_module_state->__pyx_n_s_asyncio_coroutines);
   Py_CLEAR(clear_module_state->__pyx_n_s_cline_in_traceback);
-  Py_CLEAR(clear_module_state->__pyx_kp_u_command);
   Py_CLEAR(clear_module_state->__pyx_n_s_command_set);
   Py_CLEAR(clear_module_state->__pyx_n_s_dict);
   Py_CLEAR(clear_module_state->__pyx_n_s_dict_2);
@@ -2666,7 +2640,6 @@ static int __pyx_m_clear(PyObject *m) {
   Py_CLEAR(clear_module_state->__pyx_n_s_n);
   Py_CLEAR(clear_module_state->__pyx_n_s_name);
   Py_CLEAR(clear_module_state->__pyx_n_s_new);
-  Py_CLEAR(clear_module_state->__pyx_kp_u_not_found);
   Py_CLEAR(clear_module_state->__pyx_kp_u_number);
   Py_CLEAR(clear_module_state->__pyx_n_s_parse_args);
   Py_CLEAR(clear_module_state->__pyx_n_s_pickle);
@@ -2692,19 +2665,19 @@ static int __pyx_m_clear(PyObject *m) {
   Py_CLEAR(clear_module_state->__pyx_n_s_update);
   Py_CLEAR(clear_module_state->__pyx_n_s_use_setstate);
   Py_CLEAR(clear_module_state->__pyx_int_40290629);
-  Py_CLEAR(clear_module_state->__pyx_tuple__3);
-  Py_CLEAR(clear_module_state->__pyx_tuple__5);
-  Py_CLEAR(clear_module_state->__pyx_tuple__10);
-  Py_CLEAR(clear_module_state->__pyx_tuple__12);
-  Py_CLEAR(clear_module_state->__pyx_tuple__14);
-  Py_CLEAR(clear_module_state->__pyx_codeobj__4);
+  Py_CLEAR(clear_module_state->__pyx_tuple__2);
+  Py_CLEAR(clear_module_state->__pyx_tuple__4);
+  Py_CLEAR(clear_module_state->__pyx_tuple__9);
+  Py_CLEAR(clear_module_state->__pyx_tuple__11);
+  Py_CLEAR(clear_module_state->__pyx_tuple__13);
+  Py_CLEAR(clear_module_state->__pyx_codeobj__3);
+  Py_CLEAR(clear_module_state->__pyx_codeobj__5);
   Py_CLEAR(clear_module_state->__pyx_codeobj__6);
   Py_CLEAR(clear_module_state->__pyx_codeobj__7);
   Py_CLEAR(clear_module_state->__pyx_codeobj__8);
-  Py_CLEAR(clear_module_state->__pyx_codeobj__9);
-  Py_CLEAR(clear_module_state->__pyx_codeobj__11);
-  Py_CLEAR(clear_module_state->__pyx_codeobj__13);
-  Py_CLEAR(clear_module_state->__pyx_codeobj__15);
+  Py_CLEAR(clear_module_state->__pyx_codeobj__10);
+  Py_CLEAR(clear_module_state->__pyx_codeobj__12);
+  Py_CLEAR(clear_module_state->__pyx_codeobj__14);
   return 0;
 }
 #endif
@@ -2740,7 +2713,6 @@ static int __pyx_m_traverse(PyObject *m, visitproc visit, void *arg) {
   Py_VISIT(traverse_module_state->__pyx_n_s_KoiLangCommandError);
   Py_VISIT(traverse_module_state->__pyx_n_s_KoiLangError);
   Py_VISIT(traverse_module_state->__pyx_n_s_KoiLangSyntaxError);
-  Py_VISIT(traverse_module_state->__pyx_kp_u_None);
   Py_VISIT(traverse_module_state->__pyx_n_s_Parser);
   Py_VISIT(traverse_module_state->__pyx_n_s_Parser___reduce_cython);
   Py_VISIT(traverse_module_state->__pyx_n_s_Parser___setstate_cython);
@@ -2751,12 +2723,9 @@ static int __pyx_m_traverse(PyObject *m, visitproc visit, void *arg) {
   Py_VISIT(traverse_module_state->__pyx_n_s_Parser_push);
   Py_VISIT(traverse_module_state->__pyx_n_s_PickleError);
   Py_VISIT(traverse_module_state->__pyx_n_s_StopIteration);
-  Py_VISIT(traverse_module_state->__pyx_n_s__16);
-  Py_VISIT(traverse_module_state->__pyx_kp_u__2);
-  Py_VISIT(traverse_module_state->__pyx_kp_u_an_error_occured_during_handling);
+  Py_VISIT(traverse_module_state->__pyx_n_s__15);
   Py_VISIT(traverse_module_state->__pyx_n_s_asyncio_coroutines);
   Py_VISIT(traverse_module_state->__pyx_n_s_cline_in_traceback);
-  Py_VISIT(traverse_module_state->__pyx_kp_u_command);
   Py_VISIT(traverse_module_state->__pyx_n_s_command_set);
   Py_VISIT(traverse_module_state->__pyx_n_s_dict);
   Py_VISIT(traverse_module_state->__pyx_n_s_dict_2);
@@ -2777,7 +2746,6 @@ static int __pyx_m_traverse(PyObject *m, visitproc visit, void *arg) {
   Py_VISIT(traverse_module_state->__pyx_n_s_n);
   Py_VISIT(traverse_module_state->__pyx_n_s_name);
   Py_VISIT(traverse_module_state->__pyx_n_s_new);
-  Py_VISIT(traverse_module_state->__pyx_kp_u_not_found);
   Py_VISIT(traverse_module_state->__pyx_kp_u_number);
   Py_VISIT(traverse_module_state->__pyx_n_s_parse_args);
   Py_VISIT(traverse_module_state->__pyx_n_s_pickle);
@@ -2803,19 +2771,19 @@ static int __pyx_m_traverse(PyObject *m, visitproc visit, void *arg) {
   Py_VISIT(traverse_module_state->__pyx_n_s_update);
   Py_VISIT(traverse_module_state->__pyx_n_s_use_setstate);
   Py_VISIT(traverse_module_state->__pyx_int_40290629);
-  Py_VISIT(traverse_module_state->__pyx_tuple__3);
-  Py_VISIT(traverse_module_state->__pyx_tuple__5);
-  Py_VISIT(traverse_module_state->__pyx_tuple__10);
-  Py_VISIT(traverse_module_state->__pyx_tuple__12);
-  Py_VISIT(traverse_module_state->__pyx_tuple__14);
-  Py_VISIT(traverse_module_state->__pyx_codeobj__4);
+  Py_VISIT(traverse_module_state->__pyx_tuple__2);
+  Py_VISIT(traverse_module_state->__pyx_tuple__4);
+  Py_VISIT(traverse_module_state->__pyx_tuple__9);
+  Py_VISIT(traverse_module_state->__pyx_tuple__11);
+  Py_VISIT(traverse_module_state->__pyx_tuple__13);
+  Py_VISIT(traverse_module_state->__pyx_codeobj__3);
+  Py_VISIT(traverse_module_state->__pyx_codeobj__5);
   Py_VISIT(traverse_module_state->__pyx_codeobj__6);
   Py_VISIT(traverse_module_state->__pyx_codeobj__7);
   Py_VISIT(traverse_module_state->__pyx_codeobj__8);
-  Py_VISIT(traverse_module_state->__pyx_codeobj__9);
-  Py_VISIT(traverse_module_state->__pyx_codeobj__11);
-  Py_VISIT(traverse_module_state->__pyx_codeobj__13);
-  Py_VISIT(traverse_module_state->__pyx_codeobj__15);
+  Py_VISIT(traverse_module_state->__pyx_codeobj__10);
+  Py_VISIT(traverse_module_state->__pyx_codeobj__12);
+  Py_VISIT(traverse_module_state->__pyx_codeobj__14);
   return 0;
 }
 #endif
@@ -2848,7 +2816,6 @@ static int __pyx_m_traverse(PyObject *m, visitproc visit, void *arg) {
 #define __pyx_n_s_KoiLangCommandError __pyx_mstate_global->__pyx_n_s_KoiLangCommandError
 #define __pyx_n_s_KoiLangError __pyx_mstate_global->__pyx_n_s_KoiLangError
 #define __pyx_n_s_KoiLangSyntaxError __pyx_mstate_global->__pyx_n_s_KoiLangSyntaxError
-#define __pyx_kp_u_None __pyx_mstate_global->__pyx_kp_u_None
 #define __pyx_n_s_Parser __pyx_mstate_global->__pyx_n_s_Parser
 #define __pyx_n_s_Parser___reduce_cython __pyx_mstate_global->__pyx_n_s_Parser___reduce_cython
 #define __pyx_n_s_Parser___setstate_cython __pyx_mstate_global->__pyx_n_s_Parser___setstate_cython
@@ -2859,12 +2826,9 @@ static int __pyx_m_traverse(PyObject *m, visitproc visit, void *arg) {
 #define __pyx_n_s_Parser_push __pyx_mstate_global->__pyx_n_s_Parser_push
 #define __pyx_n_s_PickleError __pyx_mstate_global->__pyx_n_s_PickleError
 #define __pyx_n_s_StopIteration __pyx_mstate_global->__pyx_n_s_StopIteration
-#define __pyx_n_s__16 __pyx_mstate_global->__pyx_n_s__16
-#define __pyx_kp_u__2 __pyx_mstate_global->__pyx_kp_u__2
-#define __pyx_kp_u_an_error_occured_during_handling __pyx_mstate_global->__pyx_kp_u_an_error_occured_during_handling
+#define __pyx_n_s__15 __pyx_mstate_global->__pyx_n_s__15
 #define __pyx_n_s_asyncio_coroutines __pyx_mstate_global->__pyx_n_s_asyncio_coroutines
 #define __pyx_n_s_cline_in_traceback __pyx_mstate_global->__pyx_n_s_cline_in_traceback
-#define __pyx_kp_u_command __pyx_mstate_global->__pyx_kp_u_command
 #define __pyx_n_s_command_set __pyx_mstate_global->__pyx_n_s_command_set
 #define __pyx_n_s_dict __pyx_mstate_global->__pyx_n_s_dict
 #define __pyx_n_s_dict_2 __pyx_mstate_global->__pyx_n_s_dict_2
@@ -2885,7 +2849,6 @@ static int __pyx_m_traverse(PyObject *m, visitproc visit, void *arg) {
 #define __pyx_n_s_n __pyx_mstate_global->__pyx_n_s_n
 #define __pyx_n_s_name __pyx_mstate_global->__pyx_n_s_name
 #define __pyx_n_s_new __pyx_mstate_global->__pyx_n_s_new
-#define __pyx_kp_u_not_found __pyx_mstate_global->__pyx_kp_u_not_found
 #define __pyx_kp_u_number __pyx_mstate_global->__pyx_kp_u_number
 #define __pyx_n_s_parse_args __pyx_mstate_global->__pyx_n_s_parse_args
 #define __pyx_n_s_pickle __pyx_mstate_global->__pyx_n_s_pickle
@@ -2911,19 +2874,19 @@ static int __pyx_m_traverse(PyObject *m, visitproc visit, void *arg) {
 #define __pyx_n_s_update __pyx_mstate_global->__pyx_n_s_update
 #define __pyx_n_s_use_setstate __pyx_mstate_global->__pyx_n_s_use_setstate
 #define __pyx_int_40290629 __pyx_mstate_global->__pyx_int_40290629
-#define __pyx_tuple__3 __pyx_mstate_global->__pyx_tuple__3
-#define __pyx_tuple__5 __pyx_mstate_global->__pyx_tuple__5
-#define __pyx_tuple__10 __pyx_mstate_global->__pyx_tuple__10
-#define __pyx_tuple__12 __pyx_mstate_global->__pyx_tuple__12
-#define __pyx_tuple__14 __pyx_mstate_global->__pyx_tuple__14
-#define __pyx_codeobj__4 __pyx_mstate_global->__pyx_codeobj__4
+#define __pyx_tuple__2 __pyx_mstate_global->__pyx_tuple__2
+#define __pyx_tuple__4 __pyx_mstate_global->__pyx_tuple__4
+#define __pyx_tuple__9 __pyx_mstate_global->__pyx_tuple__9
+#define __pyx_tuple__11 __pyx_mstate_global->__pyx_tuple__11
+#define __pyx_tuple__13 __pyx_mstate_global->__pyx_tuple__13
+#define __pyx_codeobj__3 __pyx_mstate_global->__pyx_codeobj__3
+#define __pyx_codeobj__5 __pyx_mstate_global->__pyx_codeobj__5
 #define __pyx_codeobj__6 __pyx_mstate_global->__pyx_codeobj__6
 #define __pyx_codeobj__7 __pyx_mstate_global->__pyx_codeobj__7
 #define __pyx_codeobj__8 __pyx_mstate_global->__pyx_codeobj__8
-#define __pyx_codeobj__9 __pyx_mstate_global->__pyx_codeobj__9
-#define __pyx_codeobj__11 __pyx_mstate_global->__pyx_codeobj__11
-#define __pyx_codeobj__13 __pyx_mstate_global->__pyx_codeobj__13
-#define __pyx_codeobj__15 __pyx_mstate_global->__pyx_codeobj__15
+#define __pyx_codeobj__10 __pyx_mstate_global->__pyx_codeobj__10
+#define __pyx_codeobj__12 __pyx_mstate_global->__pyx_codeobj__12
+#define __pyx_codeobj__14 __pyx_mstate_global->__pyx_codeobj__14
 #endif
 /* #### Code section: module_code ### */
 
@@ -3548,13 +3511,14 @@ static void __pyx_f_4kola_6parser_6Parser_set_error(struct __pyx_obj_4kola_6pars
   int __pyx_v_errorno = ((int)16);
   int __pyx_v_lineno;
   char const *__pyx_v_text;
+  struct __pyx_obj_4kola_5lexer_Token *__pyx_v_cur = 0;
   __Pyx_RefNannyDeclarations
-  int __pyx_t_1;
+  PyObject *__pyx_t_1 = NULL;
   int __pyx_t_2;
   int __pyx_t_3;
-  char *__pyx_t_4;
-  int __pyx_t_5;
-  PyObject *__pyx_t_6 = NULL;
+  int __pyx_t_4;
+  char *__pyx_t_5;
+  int __pyx_t_6;
   int __pyx_lineno = 0;
   const char *__pyx_filename = NULL;
   int __pyx_clineno = 0;
@@ -3570,7 +3534,7 @@ static void __pyx_f_4kola_6parser_6Parser_set_error(struct __pyx_obj_4kola_6pars
  *         cdef:
  *             int lineno = 1             # <<<<<<<<<<<<<<
  *             const char* text = ""
- *         if not self.t_cache is None:
+ *             Token cur = self.t_cache
  */
   __pyx_v_lineno = 1;
 
@@ -3578,142 +3542,154 @@ static void __pyx_f_4kola_6parser_6Parser_set_error(struct __pyx_obj_4kola_6pars
  *         cdef:
  *             int lineno = 1
  *             const char* text = ""             # <<<<<<<<<<<<<<
- *         if not self.t_cache is None:
- *             lineno = self.t_cache.lineno
+ *             Token cur = self.t_cache
+ *         if not cur is None:
  */
   __pyx_v_text = ((char const *)"");
 
   /* "kola/parser.pyx":24
  *             int lineno = 1
  *             const char* text = ""
- *         if not self.t_cache is None:             # <<<<<<<<<<<<<<
+ *             Token cur = self.t_cache             # <<<<<<<<<<<<<<
+ *         if not cur is None:
  *             lineno = self.t_cache.lineno
- *             if errorno == 16:
  */
-  __pyx_t_1 = (((PyObject *)__pyx_v_self->t_cache) != Py_None);
-  __pyx_t_2 = (__pyx_t_1 != 0);
-  if (__pyx_t_2) {
+  __pyx_t_1 = ((PyObject *)__pyx_v_self->t_cache);
+  __Pyx_INCREF(__pyx_t_1);
+  __pyx_v_cur = ((struct __pyx_obj_4kola_5lexer_Token *)__pyx_t_1);
+  __pyx_t_1 = 0;
 
-    /* "kola/parser.pyx":25
+  /* "kola/parser.pyx":25
  *             const char* text = ""
- *         if not self.t_cache is None:
- *             lineno = self.t_cache.lineno             # <<<<<<<<<<<<<<
+ *             Token cur = self.t_cache
+ *         if not cur is None:             # <<<<<<<<<<<<<<
+ *             lineno = self.t_cache.lineno
  *             if errorno == 16:
- *                 errorno = (self.stat << 4) + self.t_cache.syn
  */
-    __pyx_t_3 = __pyx_v_self->t_cache->lineno;
-    __pyx_v_lineno = __pyx_t_3;
+  __pyx_t_2 = (((PyObject *)__pyx_v_cur) != Py_None);
+  __pyx_t_3 = (__pyx_t_2 != 0);
+  if (__pyx_t_3) {
 
     /* "kola/parser.pyx":26
- *         if not self.t_cache is None:
+ *             Token cur = self.t_cache
+ *         if not cur is None:
+ *             lineno = self.t_cache.lineno             # <<<<<<<<<<<<<<
+ *             if errorno == 16:
+ *                 errorno = (self.stat << 4) + cur.syn
+ */
+    __pyx_t_4 = __pyx_v_self->t_cache->lineno;
+    __pyx_v_lineno = __pyx_t_4;
+
+    /* "kola/parser.pyx":27
+ *         if not cur is None:
  *             lineno = self.t_cache.lineno
  *             if errorno == 16:             # <<<<<<<<<<<<<<
- *                 errorno = (self.stat << 4) + self.t_cache.syn
- *             text = <char*>self.t_cache.raw_val
+ *                 errorno = (self.stat << 4) + cur.syn
+ *             text = <char*>cur.raw_val
  */
-    __pyx_t_2 = ((__pyx_v_errorno == 16) != 0);
-    if (__pyx_t_2) {
+    __pyx_t_3 = ((__pyx_v_errorno == 16) != 0);
+    if (__pyx_t_3) {
 
-      /* "kola/parser.pyx":27
+      /* "kola/parser.pyx":28
  *             lineno = self.t_cache.lineno
  *             if errorno == 16:
- *                 errorno = (self.stat << 4) + self.t_cache.syn             # <<<<<<<<<<<<<<
- *             text = <char*>self.t_cache.raw_val
+ *                 errorno = (self.stat << 4) + cur.syn             # <<<<<<<<<<<<<<
+ *             text = <char*>cur.raw_val
  *         while not self.t_cache is None and not CMD <= self.t_cache.syn <= TEXT:
  */
-      __pyx_v_errorno = ((__pyx_v_self->stat << 4) + __pyx_v_self->t_cache->syn);
+      __pyx_v_errorno = ((__pyx_v_self->stat << 4) + __pyx_v_cur->syn);
 
-      /* "kola/parser.pyx":26
- *         if not self.t_cache is None:
+      /* "kola/parser.pyx":27
+ *         if not cur is None:
  *             lineno = self.t_cache.lineno
  *             if errorno == 16:             # <<<<<<<<<<<<<<
- *                 errorno = (self.stat << 4) + self.t_cache.syn
- *             text = <char*>self.t_cache.raw_val
+ *                 errorno = (self.stat << 4) + cur.syn
+ *             text = <char*>cur.raw_val
  */
     }
 
-    /* "kola/parser.pyx":28
+    /* "kola/parser.pyx":29
  *             if errorno == 16:
- *                 errorno = (self.stat << 4) + self.t_cache.syn
- *             text = <char*>self.t_cache.raw_val             # <<<<<<<<<<<<<<
+ *                 errorno = (self.stat << 4) + cur.syn
+ *             text = <char*>cur.raw_val             # <<<<<<<<<<<<<<
  *         while not self.t_cache is None and not CMD <= self.t_cache.syn <= TEXT:
  *             self.t_cache = self.lexer.next_token()
  */
-    if (unlikely(__pyx_v_self->t_cache->raw_val == Py_None)) {
+    if (unlikely(__pyx_v_cur->raw_val == Py_None)) {
       PyErr_SetString(PyExc_TypeError, "expected bytes, NoneType found");
-      __PYX_ERR(0, 28, __pyx_L1_error)
+      __PYX_ERR(0, 29, __pyx_L1_error)
     }
-    __pyx_t_4 = __Pyx_PyBytes_AsWritableString(__pyx_v_self->t_cache->raw_val); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 28, __pyx_L1_error)
-    __pyx_v_text = ((char *)__pyx_t_4);
+    __pyx_t_5 = __Pyx_PyBytes_AsWritableString(__pyx_v_cur->raw_val); if (unlikely((!__pyx_t_5) && PyErr_Occurred())) __PYX_ERR(0, 29, __pyx_L1_error)
+    __pyx_v_text = ((char *)__pyx_t_5);
 
-    /* "kola/parser.pyx":24
- *             int lineno = 1
+    /* "kola/parser.pyx":25
  *             const char* text = ""
- *         if not self.t_cache is None:             # <<<<<<<<<<<<<<
+ *             Token cur = self.t_cache
+ *         if not cur is None:             # <<<<<<<<<<<<<<
  *             lineno = self.t_cache.lineno
  *             if errorno == 16:
  */
   }
 
-  /* "kola/parser.pyx":29
- *                 errorno = (self.stat << 4) + self.t_cache.syn
- *             text = <char*>self.t_cache.raw_val
+  /* "kola/parser.pyx":30
+ *                 errorno = (self.stat << 4) + cur.syn
+ *             text = <char*>cur.raw_val
  *         while not self.t_cache is None and not CMD <= self.t_cache.syn <= TEXT:             # <<<<<<<<<<<<<<
  *             self.t_cache = self.lexer.next_token()
  *         kola_set_error(KoiLangSyntaxError, errorno,
  */
   while (1) {
-    __pyx_t_1 = (((PyObject *)__pyx_v_self->t_cache) != Py_None);
-    __pyx_t_5 = (__pyx_t_1 != 0);
-    if (__pyx_t_5) {
+    __pyx_t_2 = (((PyObject *)__pyx_v_self->t_cache) != Py_None);
+    __pyx_t_6 = (__pyx_t_2 != 0);
+    if (__pyx_t_6) {
     } else {
-      __pyx_t_2 = __pyx_t_5;
+      __pyx_t_3 = __pyx_t_6;
       goto __pyx_L7_bool_binop_done;
     }
-    __pyx_t_5 = (CMD <= __pyx_v_self->t_cache->syn);
-    if (__pyx_t_5) {
-      __pyx_t_5 = (__pyx_v_self->t_cache->syn <= TEXT);
+    __pyx_t_6 = (CMD <= __pyx_v_self->t_cache->syn);
+    if (__pyx_t_6) {
+      __pyx_t_6 = (__pyx_v_self->t_cache->syn <= TEXT);
     }
-    __pyx_t_1 = ((!(__pyx_t_5 != 0)) != 0);
-    __pyx_t_2 = __pyx_t_1;
+    __pyx_t_2 = ((!(__pyx_t_6 != 0)) != 0);
+    __pyx_t_3 = __pyx_t_2;
     __pyx_L7_bool_binop_done:;
-    if (!__pyx_t_2) break;
+    if (!__pyx_t_3) break;
 
-    /* "kola/parser.pyx":30
- *             text = <char*>self.t_cache.raw_val
+    /* "kola/parser.pyx":31
+ *             text = <char*>cur.raw_val
  *         while not self.t_cache is None and not CMD <= self.t_cache.syn <= TEXT:
  *             self.t_cache = self.lexer.next_token()             # <<<<<<<<<<<<<<
  *         kola_set_error(KoiLangSyntaxError, errorno,
  *             self.lexer._filename, lineno, text)
  */
-    __pyx_t_6 = ((PyObject *)((struct __pyx_vtabstruct_4kola_5lexer_BaseLexer *)__pyx_v_self->lexer->__pyx_vtab)->next_token(__pyx_v_self->lexer)); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 30, __pyx_L1_error)
-    __Pyx_GOTREF(__pyx_t_6);
-    __Pyx_GIVEREF(__pyx_t_6);
+    __pyx_t_1 = ((PyObject *)((struct __pyx_vtabstruct_4kola_5lexer_BaseLexer *)__pyx_v_self->lexer->__pyx_vtab)->next_token(__pyx_v_self->lexer)); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 31, __pyx_L1_error)
+    __Pyx_GOTREF(__pyx_t_1);
+    __Pyx_GIVEREF(__pyx_t_1);
     __Pyx_GOTREF((PyObject *)__pyx_v_self->t_cache);
     __Pyx_DECREF((PyObject *)__pyx_v_self->t_cache);
-    __pyx_v_self->t_cache = ((struct __pyx_obj_4kola_5lexer_Token *)__pyx_t_6);
-    __pyx_t_6 = 0;
+    __pyx_v_self->t_cache = ((struct __pyx_obj_4kola_5lexer_Token *)__pyx_t_1);
+    __pyx_t_1 = 0;
   }
 
-  /* "kola/parser.pyx":31
+  /* "kola/parser.pyx":32
  *         while not self.t_cache is None and not CMD <= self.t_cache.syn <= TEXT:
  *             self.t_cache = self.lexer.next_token()
  *         kola_set_error(KoiLangSyntaxError, errorno,             # <<<<<<<<<<<<<<
  *             self.lexer._filename, lineno, text)
  * 
  */
-  __Pyx_GetModuleGlobalName(__pyx_t_6, __pyx_n_s_KoiLangSyntaxError); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 31, __pyx_L1_error)
-  __Pyx_GOTREF(__pyx_t_6);
+  __Pyx_GetModuleGlobalName(__pyx_t_1, __pyx_n_s_KoiLangSyntaxError); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 32, __pyx_L1_error)
+  __Pyx_GOTREF(__pyx_t_1);
 
-  /* "kola/parser.pyx":32
+  /* "kola/parser.pyx":33
  *             self.t_cache = self.lexer.next_token()
  *         kola_set_error(KoiLangSyntaxError, errorno,
  *             self.lexer._filename, lineno, text)             # <<<<<<<<<<<<<<
  * 
  *     cpdef tuple parse_args(self):
  */
-  kola_set_error(__pyx_t_6, __pyx_v_errorno, __pyx_v_self->lexer->_filename, __pyx_v_lineno, __pyx_v_text); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 31, __pyx_L1_error)
-  __Pyx_DECREF(__pyx_t_6); __pyx_t_6 = 0;
+  kola_set_error(__pyx_t_1, __pyx_v_errorno, __pyx_v_self->lexer->_filename, __pyx_v_lineno, __pyx_v_text); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 32, __pyx_L1_error)
+  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
 
   /* "kola/parser.pyx":20
  *         return n
@@ -3726,13 +3702,14 @@ static void __pyx_f_4kola_6parser_6Parser_set_error(struct __pyx_obj_4kola_6pars
   /* function exit code */
   goto __pyx_L0;
   __pyx_L1_error:;
-  __Pyx_XDECREF(__pyx_t_6);
+  __Pyx_XDECREF(__pyx_t_1);
   //__Pyx_AddTraceback("kola.parser.Parser.set_error", __pyx_clineno, __pyx_lineno, __pyx_filename);
   __pyx_L0:;
+  __Pyx_XDECREF((PyObject *)__pyx_v_cur);
   __Pyx_RefNannyFinishContext();
 }
 
-/* "kola/parser.pyx":34
+/* "kola/parser.pyx":35
  *             self.lexer._filename, lineno, text)
  * 
  *     cpdef tuple parse_args(self):             # <<<<<<<<<<<<<<
@@ -3778,7 +3755,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
     if (unlikely(!__Pyx_object_dict_version_matches(((PyObject *)__pyx_v_self), __pyx_tp_dict_version, __pyx_obj_dict_version))) {
       PY_UINT64_T __pyx_typedict_guard = __Pyx_get_tp_dict_version(((PyObject *)__pyx_v_self));
       #endif
-      __pyx_t_1 = __Pyx_PyObject_GetAttrStr(((PyObject *)__pyx_v_self), __pyx_n_s_parse_args); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 34, __pyx_L1_error)
+      __pyx_t_1 = __Pyx_PyObject_GetAttrStr(((PyObject *)__pyx_v_self), __pyx_n_s_parse_args); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 35, __pyx_L1_error)
       __Pyx_GOTREF(__pyx_t_1);
       #ifdef __Pyx_CyFunction_USED
       if (!__Pyx_IsCyOrPyCFunction(__pyx_t_1)
@@ -3804,11 +3781,11 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
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@@ -3827,7 +3804,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
     #endif
   }
 
-  /* "kola/parser.pyx":36
+  /* "kola/parser.pyx":37
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@@ -3837,31 +3814,31 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
   __pyx_v_stat = 1;
   __pyx_v_action = 0;
 
-  /* "kola/parser.pyx":38
+  /* "kola/parser.pyx":39
  *             uint8_t stat = 1, action = 0
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  *             list args = []             # <<<<<<<<<<<<<<
  *             dict kwds = {}
  *             object v
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-  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 38, __pyx_L1_error)
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-  /* "kola/parser.pyx":39
+  /* "kola/parser.pyx":40
  * 
  *             list args = []
  *             dict kwds = {}             # <<<<<<<<<<<<<<
  *             object v
  *             Token i
  */
-  __pyx_t_1 = __Pyx_PyDict_NewPresized(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 39, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_PyDict_NewPresized(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 40, __pyx_L1_error)
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-  /* "kola/parser.pyx":43
+  /* "kola/parser.pyx":44
  *             Token i
  * 
  *         while True:             # <<<<<<<<<<<<<<
@@ -3870,7 +3847,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
  */
   while (1) {
 
-    /* "kola/parser.pyx":44
+    /* "kola/parser.pyx":45
  * 
  *         while True:
  *             self.stat = stat             # <<<<<<<<<<<<<<
@@ -3879,19 +3856,19 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
  */
     __pyx_v_self->stat = __pyx_v_stat;
 
-    /* "kola/parser.pyx":45
+    /* "kola/parser.pyx":46
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  *             i = self.lexer.next_token()             # <<<<<<<<<<<<<<
  *             if i is None:
  *                 stat = yy_goto[0][stat-1]
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-    __pyx_t_1 = ((PyObject *)((struct __pyx_vtabstruct_4kola_5lexer_BaseLexer *)__pyx_v_self->lexer->__pyx_vtab)->next_token(__pyx_v_self->lexer)); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 45, __pyx_L1_error)
+    __pyx_t_1 = ((PyObject *)((struct __pyx_vtabstruct_4kola_5lexer_BaseLexer *)__pyx_v_self->lexer->__pyx_vtab)->next_token(__pyx_v_self->lexer)); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 46, __pyx_L1_error)
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-    /* "kola/parser.pyx":46
+    /* "kola/parser.pyx":47
  *             self.stat = stat
  *             i = self.lexer.next_token()
  *             if i is None:             # <<<<<<<<<<<<<<
@@ -3902,7 +3879,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
     __pyx_t_7 = (__pyx_t_6 != 0);
     if (__pyx_t_7) {
 
-      /* "kola/parser.pyx":47
+      /* "kola/parser.pyx":48
  *             i = self.lexer.next_token()
  *             if i is None:
  *                 stat = yy_goto[0][stat-1]             # <<<<<<<<<<<<<<
@@ -3911,7 +3888,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
  */
       __pyx_v_stat = ((yy_goto[0])[(__pyx_v_stat - 1)]);
 
-      /* "kola/parser.pyx":46
+      /* "kola/parser.pyx":47
  *             self.stat = stat
  *             i = self.lexer.next_token()
  *             if i is None:             # <<<<<<<<<<<<<<
@@ -3921,7 +3898,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
       goto __pyx_L5;
     }
 
-    /* "kola/parser.pyx":49
+    /* "kola/parser.pyx":50
  *                 stat = yy_goto[0][stat-1]
  *             else:
  *                 stat = yy_goto[i.get_flag()][stat - 1]             # <<<<<<<<<<<<<<
@@ -3933,7 +3910,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
     }
     __pyx_L5:;
 
-    /* "kola/parser.pyx":50
+    /* "kola/parser.pyx":51
  *             else:
  *                 stat = yy_goto[i.get_flag()][stat - 1]
  *             action = stat >> 4             # <<<<<<<<<<<<<<
@@ -3942,7 +3919,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
  */
     __pyx_v_action = (__pyx_v_stat >> 4);
 
-    /* "kola/parser.pyx":51
+    /* "kola/parser.pyx":52
  *                 stat = yy_goto[i.get_flag()][stat - 1]
  *             action = stat >> 4
  *             stat &= 0x0F             # <<<<<<<<<<<<<<
@@ -3951,7 +3928,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
  */
     __pyx_v_stat = (__pyx_v_stat & 0x0F);
 
-    /* "kola/parser.pyx":53
+    /* "kola/parser.pyx":54
  *             stat &= 0x0F
  * 
  *             if action == 1:             # <<<<<<<<<<<<<<
@@ -3961,7 +3938,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
     switch (__pyx_v_action) {
       case 1:
 
-      /* "kola/parser.pyx":54
+      /* "kola/parser.pyx":55
  * 
  *             if action == 1:
  *                 args.append(i.val)             # <<<<<<<<<<<<<<
@@ -3970,10 +3947,10 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
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       __Pyx_INCREF(__pyx_t_1);
-      __pyx_t_8 = __Pyx_PyList_Append(__pyx_v_args, __pyx_t_1); if (unlikely(__pyx_t_8 == ((int)-1))) __PYX_ERR(0, 54, __pyx_L1_error)
+      __pyx_t_8 = __Pyx_PyList_Append(__pyx_v_args, __pyx_t_1); if (unlikely(__pyx_t_8 == ((int)-1))) __PYX_ERR(0, 55, __pyx_L1_error)
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-      /* "kola/parser.pyx":53
+      /* "kola/parser.pyx":54
  *             stat &= 0x0F
  * 
  *             if action == 1:             # <<<<<<<<<<<<<<
@@ -3983,7 +3960,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
       break;
       case 2:
 
-      /* "kola/parser.pyx":56
+      /* "kola/parser.pyx":57
  *                 args.append(i.val)
  *             elif action == 2:
  *                 self.push(i)             # <<<<<<<<<<<<<<
@@ -3992,7 +3969,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
  */
       ((struct __pyx_vtabstruct_4kola_6parser_Parser *)__pyx_v_self->__pyx_vtab)->push(__pyx_v_self, __pyx_v_i, 0);
 
-      /* "kola/parser.pyx":55
+      /* "kola/parser.pyx":56
  *             if action == 1:
  *                 args.append(i.val)
  *             elif action == 2:             # <<<<<<<<<<<<<<
@@ -4002,22 +3979,22 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
       break;
       case 3:
 
-      /* "kola/parser.pyx":58
+      /* "kola/parser.pyx":59
  *                 self.push(i)
  *             elif action == 3:
  *                 args.append(self.pop().val)             # <<<<<<<<<<<<<<
  *             elif action == 4:
  *                 v = self.pop().val
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-      __pyx_t_1 = ((PyObject *)((struct __pyx_vtabstruct_4kola_6parser_Parser *)__pyx_v_self->__pyx_vtab)->pop(__pyx_v_self, 0)); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 58, __pyx_L1_error)
+      __pyx_t_1 = ((PyObject *)((struct __pyx_vtabstruct_4kola_6parser_Parser *)__pyx_v_self->__pyx_vtab)->pop(__pyx_v_self, 0)); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 59, __pyx_L1_error)
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       __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
-      __pyx_t_8 = __Pyx_PyList_Append(__pyx_v_args, __pyx_t_2); if (unlikely(__pyx_t_8 == ((int)-1))) __PYX_ERR(0, 58, __pyx_L1_error)
+      __pyx_t_8 = __Pyx_PyList_Append(__pyx_v_args, __pyx_t_2); if (unlikely(__pyx_t_8 == ((int)-1))) __PYX_ERR(0, 59, __pyx_L1_error)
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-      /* "kola/parser.pyx":57
+      /* "kola/parser.pyx":58
  *             elif action == 2:
  *                 self.push(i)
  *             elif action == 3:             # <<<<<<<<<<<<<<
@@ -4027,14 +4004,14 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
       break;
       case 4:
 
-      /* "kola/parser.pyx":60
+      /* "kola/parser.pyx":61
  *                 args.append(self.pop().val)
  *             elif action == 4:
  *                 v = self.pop().val             # <<<<<<<<<<<<<<
  *                 i = self.pop()
  *                 if not i.syn == LITERAL:
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-      __pyx_t_2 = ((PyObject *)((struct __pyx_vtabstruct_4kola_6parser_Parser *)__pyx_v_self->__pyx_vtab)->pop(__pyx_v_self, 0)); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 60, __pyx_L1_error)
+      __pyx_t_2 = ((PyObject *)((struct __pyx_vtabstruct_4kola_6parser_Parser *)__pyx_v_self->__pyx_vtab)->pop(__pyx_v_self, 0)); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 61, __pyx_L1_error)
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@@ -4042,19 +4019,19 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
       __Pyx_XDECREF_SET(__pyx_v_v, __pyx_t_1);
       __pyx_t_1 = 0;
 
-      /* "kola/parser.pyx":61
+      /* "kola/parser.pyx":62
  *             elif action == 4:
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  *                 i = self.pop()             # <<<<<<<<<<<<<<
  *                 if not i.syn == LITERAL:
  *                     self.t_cache = i
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-      __pyx_t_1 = ((PyObject *)((struct __pyx_vtabstruct_4kola_6parser_Parser *)__pyx_v_self->__pyx_vtab)->pop(__pyx_v_self, 0)); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 61, __pyx_L1_error)
+      __pyx_t_1 = ((PyObject *)((struct __pyx_vtabstruct_4kola_6parser_Parser *)__pyx_v_self->__pyx_vtab)->pop(__pyx_v_self, 0)); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 62, __pyx_L1_error)
       __Pyx_GOTREF(__pyx_t_1);
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       __pyx_t_1 = 0;
 
-      /* "kola/parser.pyx":62
+      /* "kola/parser.pyx":63
  *                 v = self.pop().val
  *                 i = self.pop()
  *                 if not i.syn == LITERAL:             # <<<<<<<<<<<<<<
@@ -4064,7 +4041,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
       __pyx_t_7 = ((!((__pyx_v_i->syn == LITERAL) != 0)) != 0);
       if (__pyx_t_7) {
 
-        /* "kola/parser.pyx":63
+        /* "kola/parser.pyx":64
  *                 i = self.pop()
  *                 if not i.syn == LITERAL:
  *                     self.t_cache = i             # <<<<<<<<<<<<<<
@@ -4077,7 +4054,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
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         __pyx_v_self->t_cache = __pyx_v_i;
 
-        /* "kola/parser.pyx":64
+        /* "kola/parser.pyx":65
  *                 if not i.syn == LITERAL:
  *                     self.t_cache = i
  *                     self.set_error(201)             # <<<<<<<<<<<<<<
@@ -4086,9 +4063,9 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
  */
         __pyx_t_9.__pyx_n = 1;
         __pyx_t_9.errorno = 0xC9;
-        ((struct __pyx_vtabstruct_4kola_6parser_Parser *)__pyx_v_self->__pyx_vtab)->set_error(__pyx_v_self, &__pyx_t_9); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 64, __pyx_L1_error)
+        ((struct __pyx_vtabstruct_4kola_6parser_Parser *)__pyx_v_self->__pyx_vtab)->set_error(__pyx_v_self, &__pyx_t_9); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 65, __pyx_L1_error)
 
-        /* "kola/parser.pyx":62
+        /* "kola/parser.pyx":63
  *                 v = self.pop().val
  *                 i = self.pop()
  *                 if not i.syn == LITERAL:             # <<<<<<<<<<<<<<
@@ -4097,16 +4074,16 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
  */
       }
 
-      /* "kola/parser.pyx":65
+      /* "kola/parser.pyx":66
  *                     self.t_cache = i
  *                     self.set_error(201)
  *                 kwds[i.val] = v             # <<<<<<<<<<<<<<
  *             elif action == 5:
  *                 i = self.pop()
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-      if (unlikely((PyDict_SetItem(__pyx_v_kwds, __pyx_v_i->val, __pyx_v_v) < 0))) __PYX_ERR(0, 65, __pyx_L1_error)
+      if (unlikely((PyDict_SetItem(__pyx_v_kwds, __pyx_v_i->val, __pyx_v_v) < 0))) __PYX_ERR(0, 66, __pyx_L1_error)
 
-      /* "kola/parser.pyx":59
+      /* "kola/parser.pyx":60
  *             elif action == 3:
  *                 args.append(self.pop().val)
  *             elif action == 4:             # <<<<<<<<<<<<<<
@@ -4116,19 +4093,19 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
       break;
       case 5:
 
-      /* "kola/parser.pyx":67
+      /* "kola/parser.pyx":68
  *                 kwds[i.val] = v
  *             elif action == 5:
  *                 i = self.pop()             # <<<<<<<<<<<<<<
  *                 if not i.syn == LITERAL:
  *                     self.t_cache = i
  */
-      __pyx_t_1 = ((PyObject *)((struct __pyx_vtabstruct_4kola_6parser_Parser *)__pyx_v_self->__pyx_vtab)->pop(__pyx_v_self, 0)); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 67, __pyx_L1_error)
+      __pyx_t_1 = ((PyObject *)((struct __pyx_vtabstruct_4kola_6parser_Parser *)__pyx_v_self->__pyx_vtab)->pop(__pyx_v_self, 0)); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 68, __pyx_L1_error)
       __Pyx_GOTREF(__pyx_t_1);
       __Pyx_DECREF_SET(__pyx_v_i, ((struct __pyx_obj_4kola_5lexer_Token *)__pyx_t_1));
       __pyx_t_1 = 0;
 
-      /* "kola/parser.pyx":68
+      /* "kola/parser.pyx":69
  *             elif action == 5:
  *                 i = self.pop()
  *                 if not i.syn == LITERAL:             # <<<<<<<<<<<<<<
@@ -4138,7 +4115,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
       __pyx_t_7 = ((!((__pyx_v_i->syn == LITERAL) != 0)) != 0);
       if (__pyx_t_7) {
 
-        /* "kola/parser.pyx":69
+        /* "kola/parser.pyx":70
  *                 i = self.pop()
  *                 if not i.syn == LITERAL:
  *                     self.t_cache = i             # <<<<<<<<<<<<<<
@@ -4151,7 +4128,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
         __Pyx_DECREF((PyObject *)__pyx_v_self->t_cache);
         __pyx_v_self->t_cache = __pyx_v_i;
 
-        /* "kola/parser.pyx":70
+        /* "kola/parser.pyx":71
  *                 if not i.syn == LITERAL:
  *                     self.t_cache = i
  *                     self.set_error(202)             # <<<<<<<<<<<<<<
@@ -4160,9 +4137,9 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
  */
         __pyx_t_9.__pyx_n = 1;
         __pyx_t_9.errorno = 0xCA;
-        ((struct __pyx_vtabstruct_4kola_6parser_Parser *)__pyx_v_self->__pyx_vtab)->set_error(__pyx_v_self, &__pyx_t_9); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 70, __pyx_L1_error)
+        ((struct __pyx_vtabstruct_4kola_6parser_Parser *)__pyx_v_self->__pyx_vtab)->set_error(__pyx_v_self, &__pyx_t_9); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 71, __pyx_L1_error)
 
-        /* "kola/parser.pyx":68
+        /* "kola/parser.pyx":69
  *             elif action == 5:
  *                 i = self.pop()
  *                 if not i.syn == LITERAL:             # <<<<<<<<<<<<<<
@@ -4171,17 +4148,17 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
  */
       }
 
-      /* "kola/parser.pyx":71
+      /* "kola/parser.pyx":72
  *                     self.t_cache = i
  *                     self.set_error(202)
  *                 kwds[i.val] = v             # <<<<<<<<<<<<<<
  *             elif action == 6:
  *                 v = [self.pop().val]
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-      if (unlikely(!__pyx_v_v)) { __Pyx_RaiseUnboundLocalError("v"); __PYX_ERR(0, 71, __pyx_L1_error) }
-      if (unlikely((PyDict_SetItem(__pyx_v_kwds, __pyx_v_i->val, __pyx_v_v) < 0))) __PYX_ERR(0, 71, __pyx_L1_error)
+      if (unlikely(!__pyx_v_v)) { __Pyx_RaiseUnboundLocalError("v"); __PYX_ERR(0, 72, __pyx_L1_error) }
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-      /* "kola/parser.pyx":66
+      /* "kola/parser.pyx":67
  *                     self.set_error(201)
  *                 kwds[i.val] = v
  *             elif action == 5:             # <<<<<<<<<<<<<<
@@ -4191,16 +4168,16 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_parse_args(struct __pyx_obj_4kola
       break;
       case 6:
 
-      /* "kola/parser.pyx":73
+      /* "kola/parser.pyx":74
  *                 kwds[i.val] = v
  *             elif action == 6:
  *                 v = [self.pop().val]             # <<<<<<<<<<<<<<
  *             elif action == 7:
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-      /* "kola/parser.pyx":109
+      /* "kola/parser.pyx":110
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-      /* "kola/parser.pyx":110
+      /* "kola/parser.pyx":111
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@@ -4749,7 +4722,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_exec_once(struct __pyx_obj_4kola_
       __pyx_r = Py_None; __Pyx_INCREF(Py_None);
       goto __pyx_L0;
 
-      /* "kola/parser.pyx":108
+      /* "kola/parser.pyx":109
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@@ -4758,7 +4731,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_exec_once(struct __pyx_obj_4kola_
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-    /* "kola/parser.pyx":106
+    /* "kola/parser.pyx":107
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  *         token = self.t_cache
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@@ -4767,19 +4740,19 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_exec_once(struct __pyx_obj_4kola_
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-  /* "kola/parser.pyx":112
+  /* "kola/parser.pyx":113
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  *         args = self.parse_args()             # <<<<<<<<<<<<<<
  *         kwds = <dict>args[1]
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+  __pyx_t_1 = ((struct __pyx_vtabstruct_4kola_6parser_Parser *)__pyx_v_self->__pyx_vtab)->parse_args(__pyx_v_self, 0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 113, __pyx_L1_error)
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-  /* "kola/parser.pyx":113
+  /* "kola/parser.pyx":114
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  *         args = self.parse_args()
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@@ -4788,9 +4761,9 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_exec_once(struct __pyx_obj_4kola_
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+  __pyx_t_1 = __Pyx_GetItemInt_Tuple(__pyx_v_args, 1, long, 1, __Pyx_PyInt_From_long, 0, 0, 1); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 114, __pyx_L1_error)
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@@ -4798,7 +4771,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_exec_once(struct __pyx_obj_4kola_
   __pyx_v_kwds = ((PyObject*)__pyx_t_2);
   __pyx_t_2 = 0;
 
-  /* "kola/parser.pyx":114
+  /* "kola/parser.pyx":115
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  *         kwds = <dict>args[1]
  *         args = <tuple>args[0]             # <<<<<<<<<<<<<<
@@ -4807,9 +4780,9 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_exec_once(struct __pyx_obj_4kola_
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+  __pyx_t_2 = __Pyx_GetItemInt_Tuple(__pyx_v_args, 0, long, 1, __Pyx_PyInt_From_long, 0, 0, 1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 115, __pyx_L1_error)
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@@ -4817,7 +4790,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_exec_once(struct __pyx_obj_4kola_
   __Pyx_DECREF_SET(__pyx_v_args, ((PyObject*)__pyx_t_1));
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-  /* "kola/parser.pyx":116
+  /* "kola/parser.pyx":117
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@@ -4827,7 +4800,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_exec_once(struct __pyx_obj_4kola_
   switch (__pyx_v_token->syn) {
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-    /* "kola/parser.pyx":117
+    /* "kola/parser.pyx":118
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@@ -4839,7 +4812,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_exec_once(struct __pyx_obj_4kola_
     __pyx_v_name = ((PyObject*)__pyx_t_1);
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-    /* "kola/parser.pyx":116
+    /* "kola/parser.pyx":117
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@@ -4849,7 +4822,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_exec_once(struct __pyx_obj_4kola_
     break;
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-    /* "kola/parser.pyx":119
+    /* "kola/parser.pyx":120
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@@ -4859,25 +4832,25 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_exec_once(struct __pyx_obj_4kola_
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-    /* "kola/parser.pyx":120
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     __Pyx_GOTREF(__pyx_t_2);
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-    /* "kola/parser.pyx":118
+    /* "kola/parser.pyx":119
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@@ -4887,7 +4860,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_exec_once(struct __pyx_obj_4kola_
     break;
     case TEXT:
 
-    /* "kola/parser.pyx":122
+    /* "kola/parser.pyx":123
  *             args = (token.val,) + args
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  *             name = "@text"             # <<<<<<<<<<<<<<
@@ -4897,14 +4870,14 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_exec_once(struct __pyx_obj_4kola_
     __Pyx_INCREF(__pyx_kp_u_text);
     __pyx_v_name = __pyx_kp_u_text;
 
-    /* "kola/parser.pyx":123
+    /* "kola/parser.pyx":124
  *         elif token.syn == TEXT:
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  *             args = (token.val,)             # <<<<<<<<<<<<<<
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  */
-    __pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 123, __pyx_L1_error)
+    __pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 124, __pyx_L1_error)
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@@ -4912,7 +4885,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_exec_once(struct __pyx_obj_4kola_
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     __pyx_t_2 = 0;
 
-    /* "kola/parser.pyx":121
+    /* "kola/parser.pyx":122
  *             name = "@number"
  *             args = (token.val,) + args
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@@ -4923,7 +4896,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_exec_once(struct __pyx_obj_4kola_
     default: break;
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-  /* "kola/parser.pyx":124
+  /* "kola/parser.pyx":125
  *             name = "@text"
  *             args = (token.val,)
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@@ -4939,20 +4912,20 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_exec_once(struct __pyx_obj_4kola_
     __Pyx_XGOTREF(__pyx_t_10);
     /*try:*/ {
 
-      /* "kola/parser.pyx":125
+      /* "kola/parser.pyx":126
  *             args = (token.val,)
  *         try:
  *             cmd = self.command_set[name]             # <<<<<<<<<<<<<<
  *         except KeyError:
- *             raise KoiLangCommandError(f"command '{name}' not found") from None
+ *             kola_set_errcause(KoiLangCommandError, 2,
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-      if (unlikely(!__pyx_v_name)) { __Pyx_RaiseUnboundLocalError("name"); __PYX_ERR(0, 125, __pyx_L5_error) }
-      __pyx_t_2 = __Pyx_PyObject_Dict_GetItem(__pyx_v_self->command_set, __pyx_v_name); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 125, __pyx_L5_error)
+      if (unlikely(!__pyx_v_name)) { __Pyx_RaiseUnboundLocalError("name"); __PYX_ERR(0, 126, __pyx_L5_error) }
+      __pyx_t_2 = __Pyx_PyObject_Dict_GetItem(__pyx_v_self->command_set, __pyx_v_name); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 126, __pyx_L5_error)
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-      /* "kola/parser.pyx":124
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  *             name = "@text"
  *             args = (token.val,)
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@@ -4970,82 +4943,62 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_exec_once(struct __pyx_obj_4kola_
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-    /* "kola/parser.pyx":126
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  *             cmd = self.command_set[name]
  *         except KeyError:             # <<<<<<<<<<<<<<
- *             raise KoiLangCommandError(f"command '{name}' not found") from None
- * 
+ *             kola_set_errcause(KoiLangCommandError, 2,
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  *             cmd = self.command_set[name]
  *         except KeyError:
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-      __Pyx_GetModuleGlobalName(__pyx_t_11, __pyx_n_s_KoiLangCommandError); if (unlikely(!__pyx_t_11)) __PYX_ERR(0, 127, __pyx_L7_except_error)
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+    __pyx_L6_exception_handled:;
+    __Pyx_XGIVEREF(__pyx_t_8);
+    __Pyx_XGIVEREF(__pyx_t_9);
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-  /* "kola/parser.pyx":129
- *             raise KoiLangCommandError(f"command '{name}' not found") from None
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  *         try:             # <<<<<<<<<<<<<<
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@@ -5076,7 +5034,7 @@ static PyObject *__pyx_f_4kola_6parser_6Parser_exec_once(struct __pyx_obj_4kola_
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+#if PY_MAJOR_VERSION == 2
+static int __Pyx_inner_PyErr_GivenExceptionMatches2(PyObject *err, PyObject* exc_type1, PyObject* exc_type2) {
+    PyObject *exception, *value, *tb;
+    int res;
+    __Pyx_PyThreadState_declare
+    __Pyx_PyThreadState_assign
+    __Pyx_ErrFetch(&exception, &value, &tb);
+    res = exc_type1 ? PyObject_IsSubclass(err, exc_type1) : 0;
+    if (unlikely(res == -1)) {
+        PyErr_WriteUnraisable(err);
+        res = 0;
+    }
+    if (!res) {
+        res = PyObject_IsSubclass(err, exc_type2);
+        if (unlikely(res == -1)) {
+            PyErr_WriteUnraisable(err);
+            res = 0;
+        }
+    }
+    __Pyx_ErrRestore(exception, value, tb);
+    return res;
+}
+#else
+static CYTHON_INLINE int __Pyx_inner_PyErr_GivenExceptionMatches2(PyObject *err, PyObject* exc_type1, PyObject *exc_type2) {
+    if (exc_type1) {
+        return __Pyx_IsAnySubtype2((PyTypeObject*)err, (PyTypeObject*)exc_type1, (PyTypeObject*)exc_type2);
+    } else {
+        return __Pyx_IsSubtype((PyTypeObject*)err, (PyTypeObject*)exc_type2);
+    }
+}
+#endif
+static int __Pyx_PyErr_GivenExceptionMatchesTuple(PyObject *exc_type, PyObject *tuple) {
+    Py_ssize_t i, n;
+    assert(PyExceptionClass_Check(exc_type));
+    n = PyTuple_GET_SIZE(tuple);
+#if PY_MAJOR_VERSION >= 3
+    for (i=0; i<n; i++) {
+        if (exc_type == PyTuple_GET_ITEM(tuple, i)) return 1;
+    }
+#endif
+    for (i=0; i<n; i++) {
+        PyObject *t = PyTuple_GET_ITEM(tuple, i);
+        #if PY_MAJOR_VERSION < 3
+        if (likely(exc_type == t)) return 1;
+        #endif
+        if (likely(PyExceptionClass_Check(t))) {
+            if (__Pyx_inner_PyErr_GivenExceptionMatches2(exc_type, NULL, t)) return 1;
+        } else {
+        }
+    }
+    return 0;
+}
+static CYTHON_INLINE int __Pyx_PyErr_GivenExceptionMatches(PyObject *err, PyObject* exc_type) {
+    if (likely(err == exc_type)) return 1;
+    if (likely(PyExceptionClass_Check(err))) {
+        if (likely(PyExceptionClass_Check(exc_type))) {
+            return __Pyx_inner_PyErr_GivenExceptionMatches2(err, NULL, exc_type);
+        } else if (likely(PyTuple_Check(exc_type))) {
+            return __Pyx_PyErr_GivenExceptionMatchesTuple(err, exc_type);
+        } else {
+        }
+    }
+    return PyErr_GivenExceptionMatches(err, exc_type);
+}
+static CYTHON_INLINE int __Pyx_PyErr_GivenExceptionMatches2(PyObject *err, PyObject *exc_type1, PyObject *exc_type2) {
+    assert(PyExceptionClass_Check(exc_type1));
+    assert(PyExceptionClass_Check(exc_type2));
+    if (likely(err == exc_type1 || err == exc_type2)) return 1;
+    if (likely(PyExceptionClass_Check(err))) {
+        return __Pyx_inner_PyErr_GivenExceptionMatches2(err, exc_type1, exc_type2);
+    }
+    return (PyErr_GivenExceptionMatches(err, exc_type1) || PyErr_GivenExceptionMatches(err, exc_type2));
+}
+#endif
+
+/* SwapException */
+#if CYTHON_FAST_THREAD_STATE
+static CYTHON_INLINE void __Pyx__ExceptionSwap(PyThreadState *tstate, PyObject **type, PyObject **value, PyObject **tb) {
+    PyObject *tmp_type, *tmp_value, *tmp_tb;
+    #if CYTHON_USE_EXC_INFO_STACK
+    _PyErr_StackItem *exc_info = tstate->exc_info;
+    tmp_type = exc_info->exc_type;
+    tmp_value = exc_info->exc_value;
+    tmp_tb = exc_info->exc_traceback;
+    exc_info->exc_type = *type;
+    exc_info->exc_value = *value;
+    exc_info->exc_traceback = *tb;
+    #else
+    tmp_type = tstate->exc_type;
+    tmp_value = tstate->exc_value;
+    tmp_tb = tstate->exc_traceback;
+    tstate->exc_type = *type;
+    tstate->exc_value = *value;
+    tstate->exc_traceback = *tb;
+    #endif
+    *type = tmp_type;
+    *value = tmp_value;
+    *tb = tmp_tb;
+}
+#else
+static CYTHON_INLINE void __Pyx_ExceptionSwap(PyObject **type, PyObject **value, PyObject **tb) {
+    PyObject *tmp_type, *tmp_value, *tmp_tb;
+    PyErr_GetExcInfo(&tmp_type, &tmp_value, &tmp_tb);
+    PyErr_SetExcInfo(*type, *value, *tb);
+    *type = tmp_type;
+    *value = tmp_value;
+    *tb = tmp_tb;
+}
+#endif
+
+/* RaiseException */
+#if PY_MAJOR_VERSION < 3
+static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb, PyObject *cause) {
     __Pyx_PyThreadState_declare
     CYTHON_UNUSED_VAR(cause);
     Py_XINCREF(type);
@@ -9650,157 +9654,6 @@ static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb, PyObject
 }
 #endif
 
-/* FastTypeChecks */
-#if CYTHON_COMPILING_IN_CPYTHON
-static int __Pyx_InBases(PyTypeObject *a, PyTypeObject *b) {
-    while (a) {
-        a = __Pyx_PyType_GetSlot(a, tp_base, PyTypeObject*);
-        if (a == b)
-            return 1;
-    }
-    return b == &PyBaseObject_Type;
-}
-static CYTHON_INLINE int __Pyx_IsSubtype(PyTypeObject *a, PyTypeObject *b) {
-    PyObject *mro;
-    if (a == b) return 1;
-    mro = a->tp_mro;
-    if (likely(mro)) {
-        Py_ssize_t i, n;
-        n = PyTuple_GET_SIZE(mro);
-        for (i = 0; i < n; i++) {
-            if (PyTuple_GET_ITEM(mro, i) == (PyObject *)b)
-                return 1;
-        }
-        return 0;
-    }
-    return __Pyx_InBases(a, b);
-}
-static CYTHON_INLINE int __Pyx_IsAnySubtype2(PyTypeObject *cls, PyTypeObject *a, PyTypeObject *b) {
-    PyObject *mro;
-    if (cls == a || cls == b) return 1;
-    mro = cls->tp_mro;
-    if (likely(mro)) {
-        Py_ssize_t i, n;
-        n = PyTuple_GET_SIZE(mro);
-        for (i = 0; i < n; i++) {
-            PyObject *base = PyTuple_GET_ITEM(mro, i);
-            if (base == (PyObject *)a || base == (PyObject *)b)
-                return 1;
-        }
-        return 0;
-    }
-    return __Pyx_InBases(cls, a) || __Pyx_InBases(cls, b);
-}
-#if PY_MAJOR_VERSION == 2
-static int __Pyx_inner_PyErr_GivenExceptionMatches2(PyObject *err, PyObject* exc_type1, PyObject* exc_type2) {
-    PyObject *exception, *value, *tb;
-    int res;
-    __Pyx_PyThreadState_declare
-    __Pyx_PyThreadState_assign
-    __Pyx_ErrFetch(&exception, &value, &tb);
-    res = exc_type1 ? PyObject_IsSubclass(err, exc_type1) : 0;
-    if (unlikely(res == -1)) {
-        PyErr_WriteUnraisable(err);
-        res = 0;
-    }
-    if (!res) {
-        res = PyObject_IsSubclass(err, exc_type2);
-        if (unlikely(res == -1)) {
-            PyErr_WriteUnraisable(err);
-            res = 0;
-        }
-    }
-    __Pyx_ErrRestore(exception, value, tb);
-    return res;
-}
-#else
-static CYTHON_INLINE int __Pyx_inner_PyErr_GivenExceptionMatches2(PyObject *err, PyObject* exc_type1, PyObject *exc_type2) {
-    if (exc_type1) {
-        return __Pyx_IsAnySubtype2((PyTypeObject*)err, (PyTypeObject*)exc_type1, (PyTypeObject*)exc_type2);
-    } else {
-        return __Pyx_IsSubtype((PyTypeObject*)err, (PyTypeObject*)exc_type2);
-    }
-}
-#endif
-static int __Pyx_PyErr_GivenExceptionMatchesTuple(PyObject *exc_type, PyObject *tuple) {
-    Py_ssize_t i, n;
-    assert(PyExceptionClass_Check(exc_type));
-    n = PyTuple_GET_SIZE(tuple);
-#if PY_MAJOR_VERSION >= 3
-    for (i=0; i<n; i++) {
-        if (exc_type == PyTuple_GET_ITEM(tuple, i)) return 1;
-    }
-#endif
-    for (i=0; i<n; i++) {
-        PyObject *t = PyTuple_GET_ITEM(tuple, i);
-        #if PY_MAJOR_VERSION < 3
-        if (likely(exc_type == t)) return 1;
-        #endif
-        if (likely(PyExceptionClass_Check(t))) {
-            if (__Pyx_inner_PyErr_GivenExceptionMatches2(exc_type, NULL, t)) return 1;
-        } else {
-        }
-    }
-    return 0;
-}
-static CYTHON_INLINE int __Pyx_PyErr_GivenExceptionMatches(PyObject *err, PyObject* exc_type) {
-    if (likely(err == exc_type)) return 1;
-    if (likely(PyExceptionClass_Check(err))) {
-        if (likely(PyExceptionClass_Check(exc_type))) {
-            return __Pyx_inner_PyErr_GivenExceptionMatches2(err, NULL, exc_type);
-        } else if (likely(PyTuple_Check(exc_type))) {
-            return __Pyx_PyErr_GivenExceptionMatchesTuple(err, exc_type);
-        } else {
-        }
-    }
-    return PyErr_GivenExceptionMatches(err, exc_type);
-}
-static CYTHON_INLINE int __Pyx_PyErr_GivenExceptionMatches2(PyObject *err, PyObject *exc_type1, PyObject *exc_type2) {
-    assert(PyExceptionClass_Check(exc_type1));
-    assert(PyExceptionClass_Check(exc_type2));
-    if (likely(err == exc_type1 || err == exc_type2)) return 1;
-    if (likely(PyExceptionClass_Check(err))) {
-        return __Pyx_inner_PyErr_GivenExceptionMatches2(err, exc_type1, exc_type2);
-    }
-    return (PyErr_GivenExceptionMatches(err, exc_type1) || PyErr_GivenExceptionMatches(err, exc_type2));
-}
-#endif
-
-/* SwapException */
-#if CYTHON_FAST_THREAD_STATE
-static CYTHON_INLINE void __Pyx__ExceptionSwap(PyThreadState *tstate, PyObject **type, PyObject **value, PyObject **tb) {
-    PyObject *tmp_type, *tmp_value, *tmp_tb;
-    #if CYTHON_USE_EXC_INFO_STACK
-    _PyErr_StackItem *exc_info = tstate->exc_info;
-    tmp_type = exc_info->exc_type;
-    tmp_value = exc_info->exc_value;
-    tmp_tb = exc_info->exc_traceback;
-    exc_info->exc_type = *type;
-    exc_info->exc_value = *value;
-    exc_info->exc_traceback = *tb;
-    #else
-    tmp_type = tstate->exc_type;
-    tmp_value = tstate->exc_value;
-    tmp_tb = tstate->exc_traceback;
-    tstate->exc_type = *type;
-    tstate->exc_value = *value;
-    tstate->exc_traceback = *tb;
-    #endif
-    *type = tmp_type;
-    *value = tmp_value;
-    *tb = tmp_tb;
-}
-#else
-static CYTHON_INLINE void __Pyx_ExceptionSwap(PyObject **type, PyObject **value, PyObject **tb) {
-    PyObject *tmp_type, *tmp_value, *tmp_tb;
-    PyErr_GetExcInfo(&tmp_type, &tmp_value, &tmp_tb);
-    PyErr_SetExcInfo(*type, *value, *tb);
-    *type = tmp_type;
-    *value = tmp_value;
-    *tb = tmp_tb;
-}
-#endif
-
 /* GetAttr3 */
 static PyObject *__Pyx_GetAttr3Default(PyObject *d) {
     __Pyx_PyThreadState_declare
@@ -9907,7 +9760,7 @@ static PyObject* __Pyx_ImportFrom(PyObject* module, PyObject* name) {
         if (unlikely(!module_name_str)) { goto modbad; }
         module_name = PyUnicode_FromString(module_name_str);
         if (unlikely(!module_name)) { goto modbad; }
-        module_dot = PyUnicode_Concat(module_name, __pyx_kp_u__2);
+        module_dot = PyUnicode_Concat(module_name, __pyx_kp_u_);
         if (unlikely(!module_dot)) { goto modbad; }
         full_name = PyUnicode_Concat(module_dot, name);
         if (unlikely(!full_name)) { goto modbad; }
@@ -12348,7 +12201,7 @@ __Pyx_PyType_GetName(PyTypeObject* tp)
                                                __pyx_n_s_name);
     if (unlikely(name == NULL) || unlikely(!PyUnicode_Check(name))) {
         PyErr_Clear();
-        Py_XSETREF(name, __Pyx_NewRef(__pyx_n_s__16));
+        Py_XSETREF(name, __Pyx_NewRef(__pyx_n_s__15));
     }
     return name;
 }
diff --git a/kola/parser.pyx b/kola/parser.pyx
index f1c674e..71e285c 100644
--- a/kola/parser.pyx
+++ b/kola/parser.pyx
@@ -21,11 +21,12 @@ cdef class Parser:
         cdef:
             int lineno = 1
             const char* text = ""
-        if not self.t_cache is None:
+            Token cur = self.t_cache
+        if not cur is None:
             lineno = self.t_cache.lineno
             if errorno == 16:
-                errorno = (self.stat << 4) + self.t_cache.syn
-            text = <char*>self.t_cache.raw_val
+                errorno = (self.stat << 4) + cur.syn
+            text = <char*>cur.raw_val
         while not self.t_cache is None and not CMD <= self.t_cache.syn <= TEXT:
             self.t_cache = self.lexer.next_token()
         kola_set_error(KoiLangSyntaxError, errorno,
@@ -124,14 +125,17 @@ cdef class Parser:
         try:
             cmd = self.command_set[name]
         except KeyError:
-            raise KoiLangCommandError(f"command '{name}' not found") from None
+            kola_set_errcause(KoiLangCommandError, 2, 
+                self.lexer._filename, token.lineno, token.raw_val, None)
         
         try:
             return cmd(*args, **kwds)
         except KoiLangError:
             raise
         except Exception as e:
-            raise KoiLangCommandError(f"an error occured during handling command '{name}'") from e
+            kola_set_errcause(KoiLangCommandError, 3, 
+                self.lexer._filename, token.lineno, token.raw_val, e)
+
     
     cpdef void exec_(self) except *:
         self.exec_once()
diff --git a/kola/version.py b/kola/version.py
index 47fc159..d7c1618 100644
--- a/kola/version.py
+++ b/kola/version.py
@@ -1,2 +1,2 @@
-__version__ = "0.1.0b3"
-version_info = (0, 1, 0, "beta", 3)
\ No newline at end of file
+__version__ = "0.1.0b4"
+version_info = (0, 1, 0, "beta", 4)
\ No newline at end of file