diff --git a/expected_results.json b/expected_results.json
index 9b3112aa..424dc949 100644
--- a/expected_results.json
+++ b/expected_results.json
@@ -1 +1 @@
-{"chapter_6/valid/rh_assignment.c": {"return_code": 1}, "chapter_6/valid/if_nested_2.c": {"return_code": 2}, "chapter_6/valid/if_nested_3.c": {"return_code": 3}, "chapter_6/valid/nested_ternary.c": {"return_code": 7}, "chapter_6/valid/binary_false_condition.c": {"return_code": 0}, "chapter_6/valid/else.c": {"return_code": 2}, "chapter_6/valid/nested_ternary_2.c": {"return_code": 15}, "chapter_6/valid/ternary_short_circuit.c": {"return_code": 1}, "chapter_6/valid/multiple_if.c": {"return_code": 8}, "chapter_6/valid/if_null_body.c": {"return_code": 1}, "chapter_6/valid/ternary_rh_binop.c": {"return_code": 1}, "chapter_6/valid/ternary_middle_assignment.c": {"return_code": 2}, "chapter_6/valid/if_nested_4.c": {"return_code": 4}, "chapter_6/valid/ternary_middle_binop.c": {"return_code": 1}, "chapter_6/valid/if_taken.c": {"return_code": 1}, "chapter_6/valid/if_not_taken.c": {"return_code": 0}, "chapter_6/valid/if_nested_5.c": {"return_code": 1}, "chapter_6/valid/assign_ternary.c": {"return_code": 2}, "chapter_6/valid/ternary.c": {"return_code": 4}, "chapter_6/valid/if_nested.c": {"return_code": 1}, "chapter_6/valid/ternary_short_circuit_2.c": {"return_code": 2}, "chapter_6/valid/binary_condition.c": {"return_code": 5}, "chapter_6/valid/extra_credit/goto_label_and_var.c": {"return_code": 5}, "chapter_6/valid/extra_credit/goto_label_main_2.c": {"return_code": 1}, "chapter_6/valid/extra_credit/bitwise_ternary.c": {"return_code": 5}, "chapter_6/valid/extra_credit/goto_label_main.c": {"return_code": 0}, "chapter_6/valid/extra_credit/goto_nested_label.c": {"return_code": 5}, "chapter_6/valid/extra_credit/goto_backwards.c": {"return_code": 5}, "chapter_6/valid/extra_credit/goto_label.c": {"return_code": 1}, "chapter_6/valid/extra_credit/compound_if_expression.c": {"return_code": 1}, "chapter_6/valid/extra_credit/goto_after_declaration.c": {"return_code": 1}, "chapter_8/valid/for.c": {"return_code": 16}, "chapter_8/valid/continue.c": {"return_code": 1}, "chapter_8/valid/multi_continue_same_loop.c": {"return_code": 1}, "chapter_8/valid/for_absent_post.c": {"return_code": 0}, "chapter_8/valid/null_for_header.c": {"return_code": 4}, "chapter_8/valid/nested_loop.c": {"return_code": 1}, "chapter_8/valid/nested_break.c": {"return_code": 250}, "chapter_8/valid/do_while.c": {"return_code": 16}, "chapter_8/valid/for_absent_condition.c": {"return_code": 0}, "chapter_8/valid/do_while_break_immediate.c": {"return_code": 10}, "chapter_8/valid/continue_empty_post.c": {"return_code": 30}, "chapter_8/valid/nested_continue.c": {"return_code": 24}, "chapter_8/valid/break.c": {"return_code": 1}, "chapter_8/valid/for_nested_shadow.c": {"return_code": 1}, "chapter_8/valid/empty_expression.c": {"return_code": 0}, "chapter_8/valid/multi_break.c": {"return_code": 1}, "chapter_8/valid/for_decl.c": {"return_code": 101}, "chapter_8/valid/for_shadow.c": {"return_code": 1}, "chapter_8/valid/break_immediate.c": {"return_code": 1}, "chapter_8/valid/while.c": {"return_code": 6}, "chapter_8/valid/empty_loop_body.c": {"return_code": 252}, "chapter_8/valid/extra_credit/switch_fallthrough.c": {"return_code": 6}, "chapter_8/valid/extra_credit/compound_assignment_for_loop.c": {"return_code": 1}, "chapter_8/valid/extra_credit/switch_break.c": {"return_code": 10}, "chapter_8/valid/extra_credit/switch_default.c": {"return_code": 22}, "chapter_8/valid/extra_credit/switch_default_fallthrough.c": {"return_code": 0}, "chapter_8/valid/extra_credit/switch_in_loop.c": {"return_code": 1}, "chapter_8/valid/extra_credit/switch_no_case.c": {"return_code": 4}, "chapter_8/valid/extra_credit/switch_nested_not_taken.c": {"return_code": 2}, "chapter_8/valid/extra_credit/switch_decl.c": {"return_code": 1}, "chapter_8/valid/extra_credit/switch_with_continue.c": {"return_code": 5}, "chapter_8/valid/extra_credit/switch_empty.c": {"return_code": 12}, "chapter_8/valid/extra_credit/goto_bypass_condition.c": {"return_code": 10}, "chapter_8/valid/extra_credit/switch_nested_switch.c": {"return_code": 1}, "chapter_8/valid/extra_credit/switch_default_not_last.c": {"return_code": 0}, "chapter_8/valid/extra_credit/switch_assign_in_condition.c": {"return_code": 2}, "chapter_8/valid/extra_credit/switch.c": {"return_code": 3}, "chapter_8/valid/extra_credit/switch_goto_mid_case.c": {"return_code": 1}, "chapter_14/valid/libraries/static_pointer.c": {"return_code": 0}, "chapter_14/valid/libraries/global_pointer.c": {"return_code": 1}, "chapter_14/valid/function_calls/address_of_argument.c": {"return_code": 0}, "chapter_14/valid/function_calls/update_value_through_pointer_parameter.c": {"return_code": 0}, "chapter_14/valid/function_calls/return_pointer.c": {"return_code": 0}, "chapter_14/valid/extra_credit/incr_through_pointer.c": {"return_code": 11}, "chapter_14/valid/extra_credit/compound_assign_through_pointer.c": {"return_code": 1}, "chapter_14/valid/declarators/declare_pointer_in_for_loop.c": {"return_code": 5}, "chapter_14/valid/declarators/abstract_declarators.c": {"return_code": 0}, "chapter_14/valid/declarators/declarators.c": {"return_code": 0}, "chapter_14/valid/dereference/static_var_indirection.c": {"return_code": 0}, "chapter_14/valid/dereference/multilevel_indirection.c": {"return_code": 0}, "chapter_14/valid/dereference/read_through_pointers.c": {"return_code": 0}, "chapter_14/valid/dereference/update_through_pointers.c": {"return_code": 0}, "chapter_14/valid/dereference/address_of_dereference.c": {"return_code": 0}, "chapter_14/valid/dereference/simple.c": {"return_code": 3}, "chapter_14/valid/dereference/dereference_expression_result.c": {"return_code": 0}, "chapter_14/valid/casts/cast_between_pointer_types.c": {"return_code": 0}, "chapter_14/valid/casts/pointer_int_casts.c": {"return_code": 0}, "chapter_14/valid/casts/null_pointer_conversion.c": {"return_code": 0}, "chapter_14/valid/comparisons/compare_pointers.c": {"return_code": 0}, "chapter_14/valid/comparisons/pointers_as_conditions.c": {"return_code": 0}, "chapter_14/valid/comparisons/compare_to_null.c": {"return_code": 0}, "chapter_10/valid/static_then_extern.c": {"return_code": 3}, "chapter_10/valid/push_arg_on_page_boundary.c": {"return_code": 1}, "chapter_10/valid/static_local_multiple_scopes.c": {"return_code": 0, "stdout": "Aa\nBb\nCc\nDd\nEe\nFf\nGg\nHh\nIi\nJj\nKk\nLl\nMm\nNn\nOo\nPp\nQq\nRr\nSs\nTt\nUu\nVv\nWw\nXx\nYy\nZz\n"}, "chapter_10/valid/tentative_definition.c": {"return_code": 5}, "chapter_10/valid/static_variables_in_expressions.c": {"return_code": 0}, "chapter_10/valid/static_recursive_call.c": {"return_code": 0, "stdout": "ABCDEFGHIJKLMNOPQRSTUVWXYZ"}, "chapter_10/valid/shadow_static_local_var.c": {"return_code": 0}, "chapter_10/valid/multiple_static_local.c": {"return_code": 29}, "chapter_10/valid/multiple_static_file_scope_vars.c": {"return_code": 4}, "chapter_10/valid/static_local_uninitialized.c": {"return_code": 4}, "chapter_10/valid/type_before_storage_class.c": {"return_code": 7}, "chapter_10/valid/extern_block_scope_variable.c": {"return_code": 3}, "chapter_10/valid/distinct_local_and_extern.c": {"return_code": 7}, "chapter_10/valid/libraries/internal_hides_external_linkage.c": {"return_code": 0}, "chapter_10/valid/libraries/external_tentative_var.c": {"return_code": 0}, "chapter_10/valid/libraries/external_linkage_function.c": {"return_code": 0}, "chapter_10/valid/libraries/external_variable.c": {"return_code": 0}, "chapter_10/valid/libraries/internal_linkage_var.c": {"return_code": 0}, "chapter_10/valid/libraries/external_var_scoping.c": {"return_code": 0}, "chapter_10/valid/libraries/internal_linkage_function.c": {"return_code": 0}, "chapter_10/valid/extra_credit/goto_skip_static_initializer.c": {"return_code": 10}, "chapter_2/valid/neg.c": {"return_code": 251}, "chapter_2/valid/negate_int_max.c": {"return_code": 1}, "chapter_2/valid/redundant_parens.c": {"return_code": 246}, "chapter_2/valid/neg_zero.c": {"return_code": 0}, "chapter_2/valid/bitwise_int_min.c": {"return_code": 254}, "chapter_2/valid/bitwise_zero.c": {"return_code": 255}, "chapter_2/valid/parens_3.c": {"return_code": 4}, "chapter_2/valid/parens_2.c": {"return_code": 253}, "chapter_2/valid/bitwise.c": {"return_code": 243}, "chapter_2/valid/nested_ops_2.c": {"return_code": 1}, "chapter_2/valid/nested_ops.c": {"return_code": 2}, "chapter_2/valid/parens.c": {"return_code": 254}, "chapter_1/valid/return_0.c": {"return_code": 0}, "chapter_1/valid/newlines.c": {"return_code": 0}, "chapter_1/valid/return_2.c": {"return_code": 2}, "chapter_1/valid/multi_digit.c": {"return_code": 100}, "chapter_1/valid/tabs.c": {"return_code": 0}, "chapter_1/valid/spaces.c": {"return_code": 0}, "chapter_1/valid/no_newlines.c": {"return_code": 0}, "chapter_13/valid/floating_expressions/logical.c": {"return_code": 0}, "chapter_13/valid/floating_expressions/arithmetic_ops.c": {"return_code": 0}, "chapter_13/valid/floating_expressions/static_initialized_double.c": {"return_code": 0}, "chapter_13/valid/floating_expressions/comparisons.c": {"return_code": 0}, "chapter_13/valid/floating_expressions/simple.c": {"return_code": 1}, "chapter_13/valid/floating_expressions/loop_controlling_expression.c": {"return_code": 100}, "chapter_13/valid/libraries/double_parameters.c": {"return_code": 0}, "chapter_13/valid/libraries/use_arg_after_fun_call.c": {"return_code": 4}, "chapter_13/valid/libraries/double_and_int_params_recursive.c": {"return_code": 0}, "chapter_13/valid/libraries/extern_double.c": {"return_code": 1}, "chapter_13/valid/libraries/double_params_and_result.c": {"return_code": 1}, "chapter_13/valid/explicit_casts/double_to_signed.c": {"return_code": 0}, "chapter_13/valid/explicit_casts/unsigned_to_double.c": {"return_code": 0}, "chapter_13/valid/explicit_casts/signed_to_double.c": {"return_code": 0}, "chapter_13/valid/explicit_casts/double_to_unsigned.c": {"return_code": 0}, "chapter_13/valid/implicit_casts/convert_for_assignment.c": {"return_code": 0}, "chapter_13/valid/implicit_casts/common_type.c": {"return_code": 0}, "chapter_13/valid/implicit_casts/static_initializers.c": {"return_code": 0}, "chapter_13/valid/implicit_casts/complex_arithmetic_common_type.c": {"return_code": 1}, "chapter_13/valid/constants/round_constants.c": {"return_code": 0}, "chapter_13/valid/constants/constant_doubles.c": {"return_code": 0}, "chapter_13/valid/special_values/subnormal_not_zero.c": {"return_code": 0}, "chapter_13/valid/special_values/negative_zero.c": {"return_code": 0}, "chapter_13/valid/special_values/infinity.c": {"return_code": 0}, "chapter_13/valid/function_calls/double_parameters.c": {"return_code": 0}, "chapter_13/valid/function_calls/double_and_int_parameters.c": {"return_code": 0}, "chapter_13/valid/function_calls/standard_library_call.c": {"return_code": 0}, "chapter_13/valid/function_calls/use_arg_after_fun_call.c": {"return_code": 4}, "chapter_13/valid/function_calls/return_double.c": {"return_code": 1}, "chapter_13/valid/function_calls/double_and_int_params_recursive.c": {"return_code": 0}, "chapter_13/valid/extra_credit/compound_assign.c": {"return_code": 1}, "chapter_13/valid/extra_credit/nan.c": {"return_code": 0}, "chapter_13/valid/extra_credit/compound_assign_implicit_cast.c": {"return_code": 1}, "chapter_18/valid/params_and_returns/temporary_lifetime.c": {"return_code": 0}, "chapter_18/valid/params_and_returns/ignore_retval.c": {"return_code": 0}, "chapter_18/valid/params_and_returns/return_space_overlap.c": {"return_code": 0}, "chapter_18/valid/params_and_returns/return_big_struct_on_page_boundary.c": {"return_code": 0}, "chapter_18/valid/params_and_returns/simple.c": {"return_code": 0}, "chapter_18/valid/params_and_returns/return_struct_on_page_boundary.c": {"return_code": 0}, "chapter_18/valid/params_and_returns/return_incomplete_type.c": {"return_code": 0}, "chapter_18/valid/params_and_returns/stack_clobber.c": {"return_code": 0}, "chapter_18/valid/params_and_returns/libraries/return_calling_conventions.c": {"return_code": 0}, "chapter_18/valid/params_and_returns/libraries/missing_retval.c": {"return_code": 1}, "chapter_18/valid/params_and_returns/libraries/access_retval_members.c": {"return_code": 0}, "chapter_18/valid/params_and_returns/libraries/retval_struct_sizes.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/semantic_analysis/resolve_tags.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/semantic_analysis/namespaces.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/semantic_analysis/incomplete_structs.c": {"return_code": 0, "stdout": "I'm a struct!\n"}, "chapter_18/valid/no_structure_parameters/semantic_analysis/cast_struct_to_void.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/libraries/global_struct.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/libraries/param_struct_pointer.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/libraries/return_struct_pointer.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/libraries/opaque_struct.c": {"return_code": 0, "stdout": "new struct\nstatic struct\nglobal struct\n"}, "chapter_18/valid/no_structure_parameters/libraries/array_of_structs.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/libraries/initializers/auto_struct_initializers.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/libraries/initializers/static_struct_initializers.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/libraries/initializers/nested_static_struct_initializers.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/libraries/initializers/nested_auto_struct_initializers.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/smoke_tests/static_vs_auto.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/smoke_tests/simple.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/size_and_offset_calculations/member_offsets.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/size_and_offset_calculations/sizeof_exps.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/size_and_offset_calculations/sizeof_type.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/scalar_member_access/arrow.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/scalar_member_access/linked_list.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/scalar_member_access/static_structs.c": {"return_code": 0, "stdout": "zero\nmn\nop\nwx\nyz\nBCD\nCDE\nDEF\nEFG\nbcd\ncde\n"}, "chapter_18/valid/no_structure_parameters/scalar_member_access/nested_struct.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/scalar_member_access/dot.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/parse_and_lex/postfix_precedence.c": {"return_code": 1}, "chapter_18/valid/no_structure_parameters/parse_and_lex/trailing_comma.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/parse_and_lex/space_around_struct_member.c": {"return_code": 1}, "chapter_18/valid/no_structure_parameters/parse_and_lex/struct_member_looks_like_const.c": {"return_code": 3}, "chapter_18/valid/no_structure_parameters/struct_copy/copy_struct_through_pointer.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/struct_copy/copy_struct_with_arrow_operator.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/struct_copy/copy_struct.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/struct_copy/stack_clobber.c": {"return_code": 0}, "chapter_18/valid/no_structure_parameters/struct_copy/copy_struct_with_dot_operator.c": {"return_code": 0}, "chapter_18/valid/parameters/pass_args_on_page_boundary.c": {"return_code": 0}, "chapter_18/valid/parameters/incomplete_param_type.c": {"return_code": 3}, "chapter_18/valid/parameters/simple.c": {"return_code": 0}, "chapter_18/valid/parameters/stack_clobber.c": {"return_code": 0}, "chapter_18/valid/parameters/libraries/param_calling_conventions.c": {"return_code": 0}, "chapter_18/valid/parameters/libraries/struct_sizes.c": {"return_code": 0}, "chapter_18/valid/parameters/libraries/pass_struct.c": {"return_code": 0}, "chapter_18/valid/parameters/libraries/modify_param.c": {"return_code": 0}, "chapter_18/valid/parameters/libraries/classify_params.c": {"return_code": 0}, "chapter_15/valid/initialization/automatic.c": {"return_code": 0}, "chapter_15/valid/initialization/static.c": {"return_code": 0}, "chapter_15/valid/initialization/trailing_comma_initializer.c": {"return_code": 3}, "chapter_15/valid/initialization/automatic_nested.c": {"return_code": 0}, "chapter_15/valid/initialization/static_nested.c": {"return_code": 0}, "chapter_15/valid/libraries/set_array_val.c": {"return_code": 0}, "chapter_15/valid/libraries/return_pointer_to_array.c": {"return_code": 0}, "chapter_15/valid/libraries/global_array.c": {"return_code": 0}, "chapter_15/valid/subscripting/subscript_nested.c": {"return_code": 0}, "chapter_15/valid/subscripting/subscript_pointer.c": {"return_code": 0}, "chapter_15/valid/subscripting/array_of_pointers_to_arrays.c": {"return_code": 0}, "chapter_15/valid/subscripting/simple_subscripts.c": {"return_code": 0}, "chapter_15/valid/subscripting/simple.c": {"return_code": 3}, "chapter_15/valid/subscripting/complex_operands.c": {"return_code": 0}, "chapter_15/valid/subscripting/addition_subscript_equivalence.c": {"return_code": 0}, "chapter_15/valid/subscripting/subscript_precedence.c": {"return_code": 1}, "chapter_15/valid/allocation/test_alignment.c": {"return_code": 0}, "chapter_15/valid/pointer_arithmetic/pointer_add.c": {"return_code": 0}, "chapter_15/valid/pointer_arithmetic/add_dereference_and_assign.c": {"return_code": 0}, "chapter_15/valid/pointer_arithmetic/pointer_diff.c": {"return_code": 0}, "chapter_15/valid/pointer_arithmetic/compare.c": {"return_code": 0}, "chapter_15/valid/extra_credit/incr_ptr.c": {"return_code": 1}, "chapter_15/valid/declarators/big_array.c": {"return_code": 0}, "chapter_15/valid/declarators/equivalent_declarators.c": {"return_code": 0}, "chapter_15/valid/declarators/return_nested_array.c": {"return_code": 0}, "chapter_15/valid/declarators/array_as_argument.c": {"return_code": 0}, "chapter_15/valid/declarators/for_loop_array.c": {"return_code": 0}, "chapter_15/valid/casts/multi_dim_casts.c": {"return_code": 0}, "chapter_15/valid/casts/implicit_and_explicit_conversions.c": {"return_code": 0}, "chapter_15/valid/casts/cast_array_of_pointers.c": {"return_code": 1}, "chapter_17/valid/void/cast_to_void.c": {"return_code": 12}, "chapter_17/valid/void/void_function.c": {"return_code": 0}, "chapter_17/valid/void/void_for_loop.c": {"return_code": 0, "stdout": "ZYXWVUTSRQPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPQRSTUVWXYZZYXWVUTSRQPONMLKJIHGFEDCBA"}, "chapter_17/valid/void/ternary.c": {"return_code": 0}, "chapter_17/valid/libraries/pass_alloced_memory.c": {"return_code": 0}, "chapter_17/valid/libraries/test_for_memory_leaks.c": {"return_code": 0}, "chapter_17/valid/libraries/sizeof_extern.c": {"return_code": 1}, "chapter_17/valid/sizeof/sizeof_basic_types.c": {"return_code": 0}, "chapter_17/valid/sizeof/sizeof_consts.c": {"return_code": 0}, "chapter_17/valid/sizeof/sizeof_expressions.c": {"return_code": 0}, "chapter_17/valid/sizeof/sizeof_array.c": {"return_code": 0}, "chapter_17/valid/sizeof/sizeof_derived_types.c": {"return_code": 0}, "chapter_17/valid/sizeof/simple.c": {"return_code": 0}, "chapter_17/valid/sizeof/sizeof_result_is_ulong.c": {"return_code": 0}, "chapter_17/valid/sizeof/sizeof_not_evaluated.c": {"return_code": 4}, "chapter_17/valid/void_pointer/array_of_pointers_to_void.c": {"return_code": 0}, "chapter_17/valid/void_pointer/conversion_by_assignment.c": {"return_code": 0}, "chapter_17/valid/void_pointer/explicit_cast.c": {"return_code": 0}, "chapter_17/valid/void_pointer/simple.c": {"return_code": 100}, "chapter_17/valid/void_pointer/memory_management_functions.c": {"return_code": 0}, "chapter_17/valid/void_pointer/common_pointer_type.c": {"return_code": 0}, "chapter_16/valid/strings_as_lvalues/addr_of_string.c": {"return_code": 0, "stdout": "Sample\tstring!\n\n"}, "chapter_16/valid/strings_as_lvalues/standard_library_calls.c": {"return_code": 0, "stdout": "Hello, World!\n"}, "chapter_16/valid/strings_as_lvalues/array_of_strings.c": {"return_code": 0}, "chapter_16/valid/strings_as_lvalues/cast_string_pointer.c": {"return_code": 0}, "chapter_16/valid/strings_as_lvalues/empty_string.c": {"return_code": 0}, "chapter_16/valid/strings_as_lvalues/pointer_operations.c": {"return_code": 0}, 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"chapter_19/whole_pipeline/all_types/propagate_into_load.c": {"return_code": 0}, "chapter_13/valid/explicit_casts/cvttsd2si_rewrite.c": {"return_code": 0}, "chapter_13/valid/explicit_casts/rewrite_cvttsd2si_regression.c": {"return_code": 0}, "chapter_13/valid/function_calls/push_xmm.c": {"return_code": 0}, "chapter_16/valid/chars/rewrite_movz_regression.c": {"return_code": 0}, "chapter_12/valid/explicit_casts/rewrite_movz_regression.c": {"return_code": 0}, "chapter_11/valid/long_expressions/rewrite_large_multiply_regression.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/rewrite_regression_test.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/cmp_no_updates.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/bin_uses_operands.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/division_uses_ax.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/cmp_generates_operands.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/eax_live_at_exit.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/unary_uses_operand.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/funcall_generates_args.c": {"return_code": 0}, "chapter_20/int_only/with_coalescing/briggs_coalesce_hardreg.c": {"return_code": 0}, "chapter_20/int_only/with_coalescing/briggs_dont_coalesce.c": {"return_code": 0}, "chapter_20/int_only/with_coalescing/george_dont_coalesce_2.c": {"return_code": 0}, "chapter_20/int_only/with_coalescing/george_dont_coalesce.c": {"return_code": 0}, "chapter_20/int_only/with_coalescing/no_george_test_for_pseudos.c": {"return_code": 0}, "chapter_20/int_only/with_coalescing/george_off_by_one.c": {"return_code": 0}, "chapter_3/valid/extra_credit/bitwise_variable_shift_count.c": {"return_code": 76}, "chapter_3/valid/extra_credit/bitwise_shiftr_negative.c": {"return_code": 255}, "chapter_4/valid/extra_credit/bitwise_shift_precedence.c": {"return_code": 1}, "chapter_4/valid/extra_credit/bitwise_and_precedence.c": {"return_code": 0}, "chapter_5/valid/extra_credit/bitwise_in_initializer.c": {"return_code": 11}, "chapter_5/valid/extra_credit/compound_assignment_lowest_precedence.c": {"return_code": 1}, "chapter_5/valid/extra_credit/bitwise_ops_vars.c": {"return_code": 9}, "chapter_5/valid/extra_credit/compound_bitwise_chained.c": {"return_code": 1}, "chapter_5/valid/extra_credit/compound_bitwise_assignment_lowest_precedence.c": {"return_code": 1}, "chapter_5/valid/extra_credit/prefix_incr_and_decr.c": {"return_code": 1}, "chapter_5/valid/extra_credit/postfix_incr_and_decr.c": {"return_code": 1}, "chapter_5/valid/extra_credit/postfix_precedence.c": {"return_code": 1}, "chapter_5/valid/extra_credit/incr_parenthesized.c": {"return_code": 1}, "chapter_6/valid/lh_assignment.c": {"return_code": 1}, "chapter_6/valid/extra_credit/prefix_if.c": {"return_code": 1}, "chapter_6/valid/extra_credit/postfix_in_ternary.c": {"return_code": 9}, "chapter_6/valid/extra_credit/prefix_in_ternary.c": {"return_code": 2}, "chapter_6/valid/extra_credit/compound_assign_ternary.c": {"return_code": 8}, "chapter_6/valid/extra_credit/lh_compound_assignment.c": {"return_code": 1}, "chapter_6/valid/extra_credit/postfix_if.c": {"return_code": 1}, "chapter_5/valid/extra_credit/incr_in_binary_expr.c": {"return_code": 1}, "chapter_5/valid/extra_credit/incr_expression_statement.c": {"return_code": 1}, "chapter_6/valid/ternary_precedence.c": {"return_code": 20}, "chapter_6/valid/extra_credit/label_token.c": {"return_code": 1}, "chapter_6/valid/extra_credit/whitespace_after_label.c": {"return_code": 1}, "chapter_6/valid/extra_credit/unused_label.c": {"return_code": 0}, "chapter_6/valid/extra_credit/label_all_statements.c": {"return_code": 100}, "chapter_7/valid/extra_credit/goto_sibling_scope.c": {"return_code": 11}, "chapter_7/valid/extra_credit/goto_outer_scope.c": {"return_code": 1}, "chapter_8/valid/extra_credit/loop_header_postfix_and_prefix.c": {"return_code": 1}, "chapter_8/valid/extra_credit/label_loops_breaks_and_continues.c": {"return_code": 12}, "chapter_8/valid/extra_credit/goto_bypass_init_exp.c": {"return_code": 1}, "chapter_8/valid/extra_credit/compound_assignment_controlling_expression.c": {"return_code": 1}, "chapter_8/valid/extra_credit/goto_bypass_post_exp.c": {"return_code": 11}, "chapter_8/valid/extra_credit/label_loop_body.c": {"return_code": 1}, "chapter_8/valid/extra_credit/post_exp_incr.c": {"return_code": 21}, "chapter_8/valid/extra_credit/switch_nested_cases.c": {"return_code": 1}, "chapter_8/valid/extra_credit/switch_with_continue_2.c": {"return_code": 5}, "chapter_8/valid/extra_credit/switch_not_taken.c": {"return_code": 1}, "chapter_8/valid/extra_credit/switch_default_only.c": {"return_code": 1}, "chapter_8/valid/extra_credit/switch_single_case.c": {"return_code": 1}, "chapter_8/valid/extra_credit/case_block.c": {"return_code": 1}, "chapter_8/valid/extra_credit/duffs_device.c": {"return_code": 1}, "chapter_8/valid/extra_credit/loop_in_switch.c": {"return_code": 123}, "chapter_9/valid/arguments_in_registers/dont_clobber_edx.c": {"return_code": 1}, "chapter_9/valid/extra_credit/label_naming_scheme.c": {"return_code": 0}, "chapter_9/valid/extra_credit/dont_clobber_ecx.c": {"return_code": 1}, "chapter_10/valid/extra_credit/bitwise_ops_file_scope_vars.c": {"return_code": 0}, "chapter_10/valid/extra_credit/label_file_scope_var_same_name.c": {"return_code": 0}, "chapter_10/valid/extra_credit/increment_global_vars.c": {"return_code": 0}, "chapter_10/valid/extra_credit/switch_on_extern.c": {"return_code": 0}, "chapter_10/valid/extra_credit/compound_assignment_static_var.c": {"return_code": 0}, "chapter_10/valid/extra_credit/label_static_var_same_name.c": {"return_code": 5}, "chapter_10/valid/extra_credit/switch_skip_extern_decl.c": {"return_code": 0}, "chapter_10/valid/extra_credit/switch_skip_static_initializer.c": {"return_code": 10}, "chapter_10/valid/extra_credit/libraries/same_label_same_fun.c": {"return_code": 0}, "chapter_4/valid/extra_credit/bitwise_xor_precedence.c": {"return_code": 5}, "chapter_4/valid/extra_credit/bitwise_or_precedence.c": {"return_code": 5}, "chapter_11/valid/extra_credit/increment_long.c": {"return_code": 0}, "chapter_11/valid/extra_credit/bitshift.c": {"return_code": 0}}
\ No newline at end of file
diff --git a/test_framework/basic.py b/test_framework/basic.py
index d13c4bcb..f3750d4b 100644
--- a/test_framework/basic.py
+++ b/test_framework/basic.py
@@ -421,6 +421,7 @@ class TestDirs:
     INVALID_SEMANTICS = "invalid_semantics"
     INVALID_DECLARATIONS = "invalid_declarations"
     INVALID_TYPES = "invalid_types"
+    INVALID_LABELS = "invalid_labels"
     INVALID_STRUCT_TAGS = "invalid_struct_tags"
     # valid test programs for parts I & II
     # (we'll handle part III test sdifferently)
@@ -434,6 +435,7 @@ class TestDirs:
         TestDirs.INVALID_SEMANTICS,
         TestDirs.INVALID_DECLARATIONS,
         TestDirs.INVALID_TYPES,
+        TestDirs.INVALID_LABELS,
         TestDirs.INVALID_STRUCT_TAGS,
     ],
     "valid": [TestDirs.VALID],
@@ -450,6 +452,7 @@ class TestDirs:
             TestDirs.INVALID_SEMANTICS,
             TestDirs.INVALID_DECLARATIONS,
             TestDirs.INVALID_TYPES,
+            TestDirs.INVALID_LABELS,
             TestDirs.INVALID_STRUCT_TAGS,
         ]
         + dirs["valid"],
@@ -460,6 +463,7 @@ class TestDirs:
             TestDirs.INVALID_SEMANTICS,
             TestDirs.INVALID_DECLARATIONS,
             TestDirs.INVALID_TYPES,
+            TestDirs.INVALID_LABELS,
             TestDirs.INVALID_STRUCT_TAGS,
         ]
         + dirs["valid"],
diff --git a/test_properties.json b/test_properties.json
index f8f6bbad..348ea1d8 100644
--- a/test_properties.json
+++ b/test_properties.json
@@ -42,6 +42,12 @@
         "chapter_4/valid/extra_credit/bitwise_and_precedence.c": [
             "bitwise"
         ],
+        "chapter_4/valid/extra_credit/bitwise_or_precedence.c": [
+            "bitwise"
+        ],
+        "chapter_4/valid/extra_credit/bitwise_xor_precedence.c": [
+            "bitwise"
+        ],
         "chapter_5/invalid_parse/extra_credit/compound_initializer.c": [
             "compound"
         ],
@@ -582,15 +588,24 @@
         "chapter_11/invalid_labels/extra_credit/switch_duplicate_cases.c": [
             "switch"
         ],
+        "chapter_11/invalid_labels/extra_credit/switch_duplicate_cases_2.c": [
+            "switch"
+        ],
         "chapter_11/valid/extra_credit/bitwise_long_op.c": [
             "bitwise"
         ],
+        "chapter_11/valid/extra_credit/bitshift.c": [
+            "bitwise"
+        ],
         "chapter_11/valid/extra_credit/compound_assign_to_int.c": [
             "compound"
         ],
         "chapter_11/valid/extra_credit/compound_assign_to_long.c": [
             "compound"
         ],
+        "chapter_11/valid/extra_credit/increment_long.c": [
+            "increment"
+        ],
         "chapter_11/valid/extra_credit/switch_int.c": [
             "switch"
         ],
diff --git a/tests/chapter_10/valid/extra_credit/increment_global_vars.c b/tests/chapter_10/valid/extra_credit/increment_global_vars.c
index 2a24281a..595ca4d1 100644
--- a/tests/chapter_10/valid/extra_credit/increment_global_vars.c
+++ b/tests/chapter_10/valid/extra_credit/increment_global_vars.c
@@ -7,8 +7,8 @@ int incr_i(void){
     if (i == 1) {
         i++;
         ++i;
-        return 0;
     }
+    return 0;
 }
 
 int decr_j(void) {
diff --git a/tests/chapter_11/invalid_labels/extra_credit/switch_duplicate_cases_2.c b/tests/chapter_11/invalid_labels/extra_credit/switch_duplicate_cases_2.c
new file mode 100644
index 00000000..891e44af
--- /dev/null
+++ b/tests/chapter_11/invalid_labels/extra_credit/switch_duplicate_cases_2.c
@@ -0,0 +1,15 @@
+int switch_statement(int i) {
+    switch((long) i) {
+        case 100l: return 0;
+        /* Even though 100l and 100 have different types, they have the same
+         * value once converted to the type of the switch expression (long)
+         * so they conflict
+         */
+        case 100: return 0;
+        default: return 1;
+    }
+}
+
+int main(void) {
+    return switch_statement(100);
+}
\ No newline at end of file
diff --git a/tests/chapter_11/valid/extra_credit/bitshift.c b/tests/chapter_11/valid/extra_credit/bitshift.c
new file mode 100644
index 00000000..935149a5
--- /dev/null
+++ b/tests/chapter_11/valid/extra_credit/bitshift.c
@@ -0,0 +1,53 @@
+// Test bit shift operations on long integers; the main focus is making sure
+// we type check them correctly
+int main(void) {
+
+    long l = 137438953472l; // 2^37
+    int shiftcount = 2;
+
+    if (l >> shiftcount != 34359738368l /* 2 ^ 35 */) {
+        return 1;
+    }
+
+    if (l << shiftcount != 549755813888 /* 2 ^ 39 */) {
+        return 2;
+    }
+
+    // test w/ immediate right operand too
+    if (l << 2 != 549755813888 /* 2 ^ 39 */) {
+        return 3;
+    }
+
+    // use long as right shift operand
+    // NOTE: we shouldn't perform usual arithmetic conversions here
+    // (result has same type as left operand) but we won't be able to fully
+    // validate that until chapter 12
+    long long_shiftcount = 3l;
+
+    // declare some variables near i; we'll make sure they aren't clobbered by
+    // bit shift operations
+    int i_neighbor1 = 0;
+    int i = -2147483645; // -2^31 + 3
+    int i_neighbor2 = 0;
+
+    // should be -2^28
+    if (i >> long_shiftcount != -268435456) {
+        return 4;
+    }
+
+    i = -1;
+    if (i >> 10l != -1) {
+        return 5;
+    }
+
+    // make sure we didn't shift any bits into i's neighbors
+    if (i_neighbor1) {
+        return 6;
+    }
+
+    if (i_neighbor2) {
+        return 7;
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/tests/chapter_11/valid/extra_credit/bitwise_long_op.c b/tests/chapter_11/valid/extra_credit/bitwise_long_op.c
index cdddf2aa..268b2f3a 100644
--- a/tests/chapter_11/valid/extra_credit/bitwise_long_op.c
+++ b/tests/chapter_11/valid/extra_credit/bitwise_long_op.c
@@ -1,34 +1,72 @@
+/* Test bitwise &, |, and ^ operations on long integers.
+ * Make sure we:
+ * - promote both operands to a common type;
+ * - actually perform quadword (not longword) operations
+ * - use appropriate rewrite rules where one operand is an
+ *   immediate that can't fit in a signed 32-bit integer
+ */
 int main(void) {
-    /* A long integer where the upper 32 bits are 0 and lower 32 bits are 1 */
-    long lower_32_bits_set = 4294967295; // 2^32 - 1
-
-    /* A long integer where upper 32 bits are 1 and lower 32 bits are 0 */
-    long upper_32_bits_set = -1 - lower_32_bits_set;
-
-    /* Casting a long to an int and back is equivalent to either:
-     * - setting all upper bits to 1, if bit 32 is 1 (meaning the truncated int is negative)
-     * or,
-     * - setting all uppers bits to 0, if bit 32 is 0 (meaning the truncated int is positive)
-     * Additionally, i & -1 == i for any signed integer i, whether i is a long or an int.
-     * The loop below validates that these properties holds for a sample of
-     * roughly 100,000,000 longs.
-     */
-    for (long l = 17179869184; l > 2147483648; l = l - 150) {
-
-        int i = (int) l;
-        if (i >= 0) {
-            /* use bitwise "and" to zero out upper bits */
-            if ((l & lower_32_bits_set) != i)
-                return 1;
-        } else {
-            /* use bitwise "or" to set upper bits */
-            if ((l | upper_32_bits_set) != i)
-                return 2;
-        }
-
-        /* every bit is set in -1, so l & -1 == l */
-        if ((l & -1) != l)
-            return 3;
-    }
-    return 0; // success
+    // basic tests to make sure we're performing quadword operations
+    long l1 = 71777214294589695l;  // 0x00ff00ff00ff00ff
+    long l2 = -4294967296;  // -2^32; upper 32 bits are 1, lower 32 bits are 0
+
+    if ((l1 & l2) != 71777214277877760l /* 0x00ff00ff00000000 */) {
+        return 1;
+    }
+
+    if ((l1 | l2) != -4278255361 /* 0xffffffff00ff00ff */) {
+        return 2;
+    }
+
+    if ((l1 ^ l2) != -71777218556133121 /* 0x0ff00ff0000ff00ff */) {
+        return 3;
+    }
+
+    /* Rewrite rules: andq $IMM, m64 doesn't work if $IMM can't fit
+     * in signed 32-bit int. Ditto for orq and xorq */
+    if ((-1l & 34359738368l) != 34359738368l) {  // 34359738368 == 2^35
+        return 4;
+    }
+
+    if ((0l | 34359738368l) != 34359738368l) {
+        return 5;
+    }
+
+    // 137438953472 == 2^37;
+    if ((34359738368l ^ 137438953472l) != 171798691840l) {
+        return 6;
+    }
+
+    /* Typechecking: promote both operands to common type */
+    long l = 4611686018427387903l;  // 0x3fffffffffffffff
+    // if we try to use i in longword bitwise op without sign-extending it
+    // first, we may try to read neighboring values l and i2
+    int i = -1073741824;  // 0b1100....0, or 0xc0000000
+    int i2 = -1;
+
+    // 1. sign-extend i to 64 bits; upper 32 bits are all 1s
+    // 2. take bitwise AND of sign-extended value with l
+    // 3. result is 3fffffffc0000000; upper bits match l, lower bits match i
+    if ((i & l) != 4611686017353646080l) {
+        return 7;
+    }
+
+    // i is sign-extended so upper bytes are 1s; lower bytes of l are 1s
+    if ((l | i) != -1) {
+        return 8;
+    }
+
+    // 0x3fffffffffffffff ^ 0xffffffffc0000000 = 0xc00000003fffffff
+    if ((l ^ i) != -4611686017353646081) {
+        return 9;
+    }
+
+    // 1. sign extend i2; value is still -1
+    // 2. XOR result w/ 0x3fffffffffffffff (as a constant this time)
+    // 3. result is the same as taking bitwise complement of 0x3fffffffffffffff
+    if ((i2 ^ 4611686018427387903l) != ~4611686018427387903l) {
+        return 10;
+    }
+
+    return 0;  // success
 }
\ No newline at end of file
diff --git a/tests/chapter_11/valid/extra_credit/compound_assign_to_int.c b/tests/chapter_11/valid/extra_credit/compound_assign_to_int.c
index f4afb002..6a4bd78a 100644
--- a/tests/chapter_11/valid/extra_credit/compound_assign_to_int.c
+++ b/tests/chapter_11/valid/extra_credit/compound_assign_to_int.c
@@ -1,5 +1,8 @@
 int main(void) {
     int i = -20;
+    int b = 2147483647;
+    int c = -5000000;
+
     /* This statement is evaluated as follows:
      * 1. sign-extend i to a long with value -20
      * 2. add this long to 2147483648, resulting in the long 2147483628,
@@ -7,5 +10,38 @@ int main(void) {
      * can be represented as an int)
      */
     i += 2147483648l;
-    return (i == 2147483628);
+
+    // make sure we got the right answer and didn't clobber b
+    if (i != 2147483628) {
+        return 1;
+    }
+    if (b != 2147483647) {
+        return 2;
+    }
+
+    // b /= -2^35 + 1
+    // if we try to perform int (rather than long)
+    // division, we'll interpret this value as 1 and
+    // b's value won't change.
+    b /= -34359738367l;
+    if (b) { // b's value should be 0
+        return 3;
+    }
+
+    // make sure we didn't clobber i or c
+    if (i != 2147483628) {
+        return 4;
+    }
+    if (c != -5000000) {
+        return 5;
+    }
+
+    // this result will be outside the range of int; we'll
+    // convert it to int in the usual implementation-defined way
+    c *= 10000l;
+    if (c != 1539607552) {
+        return 6;
+    }
+
+    return 0;
 }
\ No newline at end of file
diff --git a/tests/chapter_11/valid/extra_credit/compound_assign_to_long.c b/tests/chapter_11/valid/extra_credit/compound_assign_to_long.c
index dff8b69e..3827bf15 100644
--- a/tests/chapter_11/valid/extra_credit/compound_assign_to_long.c
+++ b/tests/chapter_11/valid/extra_credit/compound_assign_to_long.c
@@ -1,7 +1,10 @@
 int main(void) {
-    long l = -1;
+    long l = -34359738368l; // -2^35
     int i = -10;
-    /* We should convert i to a long, then add it to l */
-    l += i;
-    return (l == -11);
+    /* We should convert i to a long, then subtract from l */
+    l -= i;
+    if (l != -34359738358l) {
+        return 1;
+    }
+    return 0;
 }
\ No newline at end of file
diff --git a/tests/chapter_11/valid/extra_credit/increment_long.c b/tests/chapter_11/valid/extra_credit/increment_long.c
new file mode 100644
index 00000000..21a07774
--- /dev/null
+++ b/tests/chapter_11/valid/extra_credit/increment_long.c
@@ -0,0 +1,22 @@
+// make sure we support prefix and postfix ++/-- on long variables
+int main(void) {
+    long x = -9223372036854775807l;
+
+    // postfix ++
+    if (x++ != -9223372036854775807l) {
+        return 1;
+    }
+    if (x != -9223372036854775806l) {
+        return 2;
+    }
+
+    // prefix --
+    if (--x != -9223372036854775807l) {
+        return 3;
+    }
+    if (x != -9223372036854775807l) {
+        return 4;
+    }
+
+    return 0; // success
+}
\ No newline at end of file
diff --git a/tests/chapter_11/valid/extra_credit/switch_int.c b/tests/chapter_11/valid/extra_credit/switch_int.c
index ed4004ab..2a47e574 100644
--- a/tests/chapter_11/valid/extra_credit/switch_int.c
+++ b/tests/chapter_11/valid/extra_credit/switch_int.c
@@ -31,16 +31,16 @@ int main(void) {
      * that we get the expected result
      */
     if (switch_on_int(5) != 0)
-        return 0;
+        return 1;
     if (switch_on_int(0) != 1)
-        return 0;
+        return 2;
     if (switch_on_int(-1) != 2)
-        return 0;
+        return 3;
     /* 17179869184 is 2^34; it will be truncated to 0
      * when passed as a parameter to switch_on_int
      */
     if (switch_on_int(17179869184) != 1)
-        return 0;
+        return 4;
 
-    return 1;
+    return 0;
 }
\ No newline at end of file
diff --git a/tests/chapter_3/valid/extra_credit/bitwise_shiftr_negative.c b/tests/chapter_3/valid/extra_credit/bitwise_shiftr_negative.c
index 0c6706ae..7cee0170 100644
--- a/tests/chapter_3/valid/extra_credit/bitwise_shiftr_negative.c
+++ b/tests/chapter_3/valid/extra_credit/bitwise_shiftr_negative.c
@@ -1,4 +1,8 @@
-/* Make sure we use arithmetic rather than logical right shift */
+/* Make sure we use arithmetic rather than logical right shift.
+ * NOTE: right bitshift of negative value is implementation-defined;
+ * we follow GCC and use sign extension
+ * (see https://gcc.gnu.org/onlinedocs/gcc/Integers-implementation.html)
+ * */
 int main(void) {
     return -5 >> 30;
 }
\ No newline at end of file
diff --git a/tests/chapter_4/valid/extra_credit/bitwise_and_precedence.c b/tests/chapter_4/valid/extra_credit/bitwise_and_precedence.c
index 348bd63b..0f5b27e5 100644
--- a/tests/chapter_4/valid/extra_credit/bitwise_and_precedence.c
+++ b/tests/chapter_4/valid/extra_credit/bitwise_and_precedence.c
@@ -3,5 +3,6 @@
 #endif
 
 int main(void) {
+    // & has lower precedence than ==
     return 5 & 7 == 5;
 }
\ No newline at end of file
diff --git a/tests/chapter_4/valid/extra_credit/bitwise_or_precedence.c b/tests/chapter_4/valid/extra_credit/bitwise_or_precedence.c
new file mode 100644
index 00000000..3aed4045
--- /dev/null
+++ b/tests/chapter_4/valid/extra_credit/bitwise_or_precedence.c
@@ -0,0 +1,8 @@
+#ifdef SUPPRESS_WARNINGS
+#pragma GCC diagnostic ignored "-Wparentheses"
+#endif
+
+int main(void) {
+    // | has lower precedence than !=
+    return 5 | 7 != 5;
+}
\ No newline at end of file
diff --git a/tests/chapter_4/valid/extra_credit/bitwise_xor_precedence.c b/tests/chapter_4/valid/extra_credit/bitwise_xor_precedence.c
new file mode 100644
index 00000000..9adee300
--- /dev/null
+++ b/tests/chapter_4/valid/extra_credit/bitwise_xor_precedence.c
@@ -0,0 +1,8 @@
+#ifdef SUPPRESS_WARNINGS
+#pragma GCC diagnostic ignored "-Wparentheses"
+#endif
+
+int main(void) {
+    // ^ has lower precedence than <
+    return 5 ^ 7 < 5;
+}
\ No newline at end of file