diff --git a/.clang-format b/.clang-format
index 26cb1dd..e707e6c 100644
--- a/.clang-format
+++ b/.clang-format
@@ -2,3 +2,4 @@
 BasedOnStyle: Chromium
 ColumnLimit:  100
 IndentWidth: 4
+AlignEscapedNewlines: DontAlign
diff --git a/source/Utils.cpp b/source/Utils.cpp
index 242840a..3762406 100644
--- a/source/Utils.cpp
+++ b/source/Utils.cpp
@@ -14,10 +14,7 @@
 std::string tryDemangle(const char* mangled) {
     int rc;
     char* out = abi::__cxa_demangle(mangled, NULL, NULL, &rc);
-    if (rc != 0) {
-        PRINTF_ERR("demangling error\n");
-        exit(1);
-    }
+    ASSERT(rc == 0, "demangling failed");
     std::string outStr = out;
     free(out);
     return outStr;
diff --git a/source/Utils.hpp b/source/Utils.hpp
index 55ee94d..e4accd5 100644
--- a/source/Utils.hpp
+++ b/source/Utils.hpp
@@ -84,8 +84,22 @@ std::string prefixLines(const std::string& str, const std::string& linePrefix);
 
 // NOTE: doing it as variadic func rather than macro would prevent
 // compiler from issuing warnings about incorrect format string
-#define PRINTF_ERR(...)                   \
-    do {                                  \
+#define PRINTF_ERR(...) \
+    do { \
         fprintf(stderr, "sv-bugpoint: "); \
-        fprintf(stderr, __VA_ARGS__);     \
+        fprintf(stderr, __VA_ARGS__); \
+    } while (0)
+
+#define PRINTF_INTERNAL_ERR(...) \
+    do { \
+        PRINTF_ERR("Internal error: %s:%d: ", __FILE__, __LINE__); \
+        fprintf(stderr, __VA_ARGS__); \
+    } while (0)
+
+#define ASSERT(cond, msg) \
+    do { \
+        if (!(cond)) { \
+            PRINTF_INTERNAL_ERR("Assertion `%s` failed: %s\n", #cond, msg); \
+            exit(1); \
+        } \
     } while (0)