diff --git a/expected_results.json b/expected_results.json
index db3e792b..29f62522 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": 0}, "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": 4}, "chapter_8/valid/extra_credit/compound_assignment_for_loop.c": {"return_code": 10}, "chapter_8/valid/extra_credit/switch_break.c": {"return_code": 5}, "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_with_loop.c": {"return_code": 123}, "chapter_8/valid/extra_credit/switch_assign_in_body.c": {"return_code": 3}, "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_case.c": {"return_code": 3}, "chapter_8/valid/extra_credit/switch_nested_not_taken.c": {"return_code": 2}, "chapter_8/valid/extra_credit/switch_decl.c": {"return_code": 7}, "chapter_8/valid/extra_credit/switch_with_continue.c": {"return_code": 5}, "chapter_8/valid/extra_credit/switch_empty.c": {"return_code": 10}, "chapter_8/valid/extra_credit/goto_loop_body.c": {"return_code": 1}, "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_block.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"}, 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{"return_code": 0}, "chapter_4/valid/precedence.c": {"return_code": 1}, "chapter_4/valid/not_sum_2.c": {"return_code": 0}, "chapter_4/valid/and_true.c": {"return_code": 1}, "chapter_4/valid/lt_true.c": {"return_code": 1}, "chapter_4/valid/extra_credit/bitwise_precedence.c": {"return_code": 1}, "chapter_3/valid/mod.c": {"return_code": 0}, "chapter_3/valid/unop_add.c": {"return_code": 0}, "chapter_3/valid/associativity_3.c": {"return_code": 8}, "chapter_3/valid/mult.c": {"return_code": 6}, "chapter_3/valid/sub.c": {"return_code": 255}, "chapter_3/valid/div_neg.c": {"return_code": 254}, "chapter_3/valid/unop_parens.c": {"return_code": 253}, "chapter_3/valid/add.c": {"return_code": 3}, "chapter_3/valid/associativity.c": {"return_code": 252}, "chapter_3/valid/associativity_2.c": {"return_code": 1}, "chapter_3/valid/div.c": {"return_code": 2}, "chapter_3/valid/sub_neg.c": {"return_code": 3}, "chapter_3/valid/associativity_and_precedence.c": {"return_code": 10}, "chapter_3/valid/parens.c": {"return_code": 14}, "chapter_3/valid/precedence.c": {"return_code": 14}, "chapter_3/valid/extra_credit/bitwise_shiftr.c": {"return_code": 62}, "chapter_3/valid/extra_credit/bitwise_and.c": {"return_code": 1}, "chapter_3/valid/extra_credit/bitwise_shiftl.c": {"return_code": 140}, "chapter_3/valid/extra_credit/bitwise_or.c": {"return_code": 3}, "chapter_3/valid/extra_credit/bitwise_shift_precedence.c": {"return_code": 0}, "chapter_3/valid/extra_credit/bitwise_xor.c": {"return_code": 6}, "chapter_3/valid/extra_credit/bitwise_shift_associativity_2.c": {"return_code": 16}, "chapter_3/valid/extra_credit/bitwise_shift_associativity.c": {"return_code": 66}, "chapter_3/valid/extra_credit/bitwise_precedence.c": {"return_code": 21}, "chapter_11/valid/long_expressions/long_args.c": {"return_code": 0}, "chapter_11/valid/long_expressions/logical.c": {"return_code": 0}, "chapter_11/valid/long_expressions/type_specifiers.c": {"return_code": 0}, "chapter_11/valid/long_expressions/multi_op.c": 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"chapter_11/valid/implicit_casts/convert_by_assignment.c": {"return_code": 0}, "chapter_11/valid/implicit_casts/common_type.c": {"return_code": 0}, "chapter_11/valid/implicit_casts/long_constants.c": {"return_code": 0}, "chapter_11/valid/implicit_casts/convert_function_arguments.c": {"return_code": 0}, "chapter_11/valid/implicit_casts/convert_static_initializer.c": {"return_code": 0}, "chapter_11/valid/extra_credit/bitwise_long_op.c": {"return_code": 0}, "chapter_11/valid/extra_credit/compound_assign_to_int.c": {"return_code": 1}, "chapter_11/valid/extra_credit/compound_assign_to_long.c": {"return_code": 1}, "chapter_11/valid/extra_credit/switch_int.c": {"return_code": 1}, "chapter_11/valid/extra_credit/switch_long.c": {"return_code": 0}, "chapter_19/constant_folding/all_types/fold_truncate.c": {"return_code": 0}, "chapter_19/constant_folding/all_types/fold_cast_to_double.c": {"return_code": 0}, "chapter_19/constant_folding/all_types/fold_ulong.c": {"return_code": 0}, "chapter_19/constant_folding/all_types/fold_double.c": {"return_code": 0}, "chapter_19/constant_folding/all_types/fold_conditional_jump.c": {"return_code": 0}, "chapter_19/constant_folding/all_types/fold_extensions_and_copies.c": {"return_code": 0}, "chapter_19/constant_folding/all_types/negative_zero.c": {"return_code": 0}, "chapter_19/constant_folding/all_types/fold_long.c": {"return_code": 0}, "chapter_19/constant_folding/all_types/fold_uint.c": {"return_code": 0}, "chapter_19/constant_folding/all_types/fold_cast_from_double.c": {"return_code": 0}, "chapter_19/constant_folding/int_only/fold_unary.c": {"return_code": 0}, "chapter_19/constant_folding/int_only/fold_conditional_jump.c": {"return_code": 0}, "chapter_19/constant_folding/int_only/fold_binary.c": {"return_code": 0}, "chapter_19/constant_folding/int_only/fold_control_flow.c": {"return_code": 0}, "chapter_19/constant_folding/int_only/fold_exception.c": {"return_code": 0}, "chapter_19/unreachable_code_elimination/remove_useless_starting_label.c": {"return_code": 99}, "chapter_19/unreachable_code_elimination/dead_for_loop.c": {"return_code": 10}, "chapter_19/unreachable_code_elimination/and_clause.c": {"return_code": 0}, "chapter_19/unreachable_code_elimination/keep_final_jump.c": {"return_code": 17}, "chapter_19/unreachable_code_elimination/remove_jump_keep_label.c": {"return_code": 10}, "chapter_19/unreachable_code_elimination/dead_branch_inside_loop.c": {"return_code": 0}, "chapter_19/unreachable_code_elimination/empty.c": {"return_code": 0}, "chapter_19/unreachable_code_elimination/infinite_loop.c": {"return_code": 11}, "chapter_19/unreachable_code_elimination/constant_if_else.c": {"return_code": 45}, "chapter_19/unreachable_code_elimination/dead_blocks_with_predecessors.c": {"return_code": 5}, "chapter_19/unreachable_code_elimination/remove_conditional_jumps.c": {"return_code": 1}, "chapter_19/unreachable_code_elimination/dead_after_return.c": {"return_code": 2}, "chapter_19/unreachable_code_elimination/empty_block.c": {"return_code": 0}, "chapter_19/unreachable_code_elimination/dead_after_if_else.c": {"return_code": 0}, "chapter_19/unreachable_code_elimination/or_clause.c": {"return_code": 1}, "chapter_19/copy_propagation/all_types/pointer_arithmetic.c": {"return_code": 2}, "chapter_19/copy_propagation/all_types/store_doesnt_kill.c": {"return_code": 0}, "chapter_19/copy_propagation/all_types/propagate_into_type_conversions.c": {"return_code": 0}, "chapter_19/copy_propagation/all_types/redundant_double_copies.c": {"return_code": 0}, "chapter_19/copy_propagation/all_types/char_type_conversion.c": {"return_code": 1, "stdout": "CBA@"}, "chapter_19/copy_propagation/all_types/alias_analysis.c": {"return_code": 0}, "chapter_19/copy_propagation/all_types/copy_struct.c": {"return_code": 0}, "chapter_19/copy_propagation/all_types/redundant_struct_copies.c": {"return_code": 1}, "chapter_19/copy_propagation/all_types/propagate_null_pointer.c": {"return_code": 1}, "chapter_19/copy_propagation/all_types/propagate_all_types.c": {"return_code": 1}, "chapter_19/copy_propagation/all_types/funcall_kills_aliased.c": {"return_code": 0}, "chapter_19/copy_propagation/all_types/dont_propagate/static_are_aliased.c": {"return_code": 0}, "chapter_19/copy_propagation/all_types/dont_propagate/store_kills_aliased.c": {"return_code": 0}, "chapter_19/copy_propagation/all_types/dont_propagate/copy_to_offset.c": {"return_code": 3}, "chapter_19/copy_propagation/all_types/dont_propagate/dont_propagate_addr_of.c": {"return_code": 0}, "chapter_19/copy_propagation/all_types/dont_propagate/type_conversion.c": {"return_code": 1}, "chapter_19/copy_propagation/all_types/dont_propagate/zero_neg_zero_different.c": {"return_code": 1}, "chapter_19/copy_propagation/int_only/killed_then_redefined.c": {"return_code": 0}, "chapter_19/copy_propagation/int_only/different_paths_same_copy.c": {"return_code": 0}, "chapter_19/copy_propagation/int_only/multi_path_no_kill.c": {"return_code": 0}, "chapter_19/copy_propagation/int_only/redundant_copies.c": {"return_code": 20}, "chapter_19/copy_propagation/int_only/fig_19_8.c": {"return_code": 0}, "chapter_19/copy_propagation/int_only/propagate_into_complex_expressions.c": {"return_code": 1}, "chapter_19/copy_propagation/int_only/propagate_static.c": {"return_code": 0}, "chapter_19/copy_propagation/int_only/propagate_static_var.c": {"return_code": 0}, "chapter_19/copy_propagation/int_only/kill_and_add_copies.c": {"return_code": 0}, "chapter_19/copy_propagation/int_only/init_all_copies.c": {"return_code": 0}, "chapter_19/copy_propagation/int_only/propagate_params.c": {"return_code": 0}, "chapter_19/copy_propagation/int_only/nested_loops.c": {"return_code": 0}, "chapter_19/copy_propagation/int_only/constant_propagation.c": {"return_code": 6}, "chapter_19/copy_propagation/int_only/propagate_var.c": {"return_code": 0}, "chapter_19/copy_propagation/int_only/different_source_values_same_copy.c": {"return_code": 0}, "chapter_19/copy_propagation/int_only/dont_propagate/source_killed_on_one_path.c": {"return_code": 0, "stdout": "DA"}, "chapter_19/copy_propagation/int_only/dont_propagate/one_reaching_copy.c": {"return_code": 0}, "chapter_19/copy_propagation/int_only/dont_propagate/dest_killed.c": {"return_code": 4}, "chapter_19/copy_propagation/int_only/dont_propagate/no_copies_reach_entry.c": {"return_code": 4}, "chapter_19/copy_propagation/int_only/dont_propagate/listing_19_14.c": {"return_code": 101}, "chapter_19/copy_propagation/int_only/dont_propagate/add_all_blocks_to_worklist.c": {"return_code": 100}, "chapter_19/copy_propagation/int_only/dont_propagate/multi_values.c": {"return_code": 0}, "chapter_19/copy_propagation/int_only/dont_propagate/static_dst_killed.c": {"return_code": 0}, "chapter_19/copy_propagation/int_only/dont_propagate/static_src_killed.c": {"return_code": 0}, "chapter_19/copy_propagation/int_only/dont_propagate/source_killed.c": {"return_code": 0}, "chapter_19/dead_store_elimination/all_types/aliased_dead_at_exit.c": {"return_code": 0}, "chapter_19/dead_store_elimination/all_types/getaddr_doesnt_gen.c": {"return_code": 0}, "chapter_19/dead_store_elimination/all_types/copy_to_dead_struct.c": {"return_code": 4}, "chapter_19/dead_store_elimination/all_types/delete_dead_pt_ii_instructions.c": {"return_code": 5}, "chapter_19/dead_store_elimination/all_types/dont_elim/funcall_generates_aliased.c": {"return_code": 4}, "chapter_19/dead_store_elimination/all_types/dont_elim/copytooffset_doesnt_kill.c": {"return_code": 0}, "chapter_19/dead_store_elimination/all_types/dont_elim/use_and_update.c": {"return_code": 1}, "chapter_19/dead_store_elimination/all_types/dont_elim/recognize_all_uses.c": {"return_code": 0}, "chapter_19/dead_store_elimination/all_types/dont_elim/never_kill_store.c": {"return_code": 4}, "chapter_19/dead_store_elimination/all_types/dont_elim/load_generates_aliased.c": {"return_code": 10}, "chapter_19/dead_store_elimination/int_only/static_not_always_live.c": {"return_code": 23}, "chapter_19/dead_store_elimination/int_only/fig_19_11.c": {"return_code": 0}, "chapter_19/dead_store_elimination/int_only/dead_store_static_var.c": {"return_code": 0}, "chapter_19/dead_store_elimination/int_only/loop_dead_store.c": {"return_code": 0, "stdout": "CHNTZ"}, "chapter_19/dead_store_elimination/int_only/simple.c": {"return_code": 3}, "chapter_19/dead_store_elimination/int_only/delete_arithmetic_ops.c": {"return_code": 5}, "chapter_19/dead_store_elimination/int_only/elim_second_copy.c": {"return_code": 0}, "chapter_19/dead_store_elimination/int_only/initialize_blocks_with_empty_set.c": {"return_code": 1}, "chapter_19/dead_store_elimination/int_only/dont_elim/self_copy.c": {"return_code": 0}, "chapter_19/dead_store_elimination/int_only/dont_elim/static_vars_at_exit.c": {"return_code": 0}, "chapter_19/dead_store_elimination/int_only/dont_elim/used_one_path.c": {"return_code": 0}, "chapter_19/dead_store_elimination/int_only/dont_elim/recognize_all_uses.c": {"return_code": 0}, "chapter_19/dead_store_elimination/int_only/dont_elim/dont_remove_funcall.c": {"return_code": 0, "stdout": "C"}, "chapter_19/dead_store_elimination/int_only/dont_elim/add_all_to_worklist.c": {"return_code": 0, "stdout": "ML"}, "chapter_19/dead_store_elimination/int_only/dont_elim/nested_loops.c": {"return_code": 0, "stdout": "DKHEB"}, "chapter_19/dead_store_elimination/int_only/dont_elim/loop.c": {"return_code": 1}, "chapter_19/dead_store_elimination/int_only/dont_elim/static_vars_fun.c": {"return_code": 5}, "chapter_19/whole_pipeline/all_types/fold_infinity.c": {"return_code": 0}, "chapter_19/whole_pipeline/all_types/fold_cast_to_double.c": {"return_code": 0}, "chapter_19/whole_pipeline/all_types/signed_unsigned_conversion.c": {"return_code": 0}, "chapter_19/whole_pipeline/all_types/alias_analysis_change.c": {"return_code": 0, "stdout": "A"}, "chapter_19/whole_pipeline/all_types/fold_char_condition.c": {"return_code": 0}, "chapter_19/whole_pipeline/all_types/fold_negative_zero.c": {"return_code": 0}, "chapter_19/whole_pipeline/all_types/fold_negative_values.c": {"return_code": 0}, "chapter_19/whole_pipeline/all_types/listing_19_5_more_types.c": {"return_code": 9}, "chapter_19/whole_pipeline/all_types/fold_cast_from_double.c": {"return_code": 0}, "chapter_19/whole_pipeline/all_types/fold_extension_and_truncation.c": {"return_code": 0}, "chapter_19/whole_pipeline/int_only/dead_condition.c": {"return_code": 10}, "chapter_19/whole_pipeline/int_only/listing_19_5.c": {"return_code": 9}, "chapter_19/whole_pipeline/int_only/elim_and_copy_prop.c": {"return_code": 10}, "chapter_19/whole_pipeline/int_only/remainder_test.c": {"return_code": 0}, "chapter_19/whole_pipeline/int_only/int_min.c": {"return_code": 0}, "chapter_20/all_types/no_coalescing/mixed_ints.c": {"return_code": 9}, "chapter_20/all_types/no_coalescing/dbl_trivially_colorable.c": {"return_code": 3}, "chapter_20/all_types/no_coalescing/dbl_fun_call.c": {"return_code": 1}, "chapter_20/all_types/no_coalescing/stack_alignment.c": {"return_code": 1}, "chapter_20/all_types/no_coalescing/track_dbl_arg_registers.c": {"return_code": 1}, "chapter_20/all_types/no_coalescing/fourteen_pseudos_interfere.c": {"return_code": 0}, "chapter_20/all_types/no_coalescing/div_interference.c": {"return_code": 1}, "chapter_20/all_types/no_coalescing/test_spilling_dbls.c": {"return_code": 3}, "chapter_20/all_types/no_coalescing/store_pointer_in_register.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/same_instr_interference.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/test_spill_metric.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/unary_interference.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/optimistic_coloring.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/track_arg_registers.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/many_pseudos_fewer_conflicts.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/same_instr_no_interference.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/copy_no_interference.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/force_spill.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/callee_saved_stack_alignment.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/idiv_interference.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/preserve_across_fun_call.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/use_all_hardregs.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/test_spill_metric_2.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/loop.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/trivially_colorable.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/cdq_interference.c": {"return_code": 0}, "chapter_20/int_only/with_coalescing/coalesce_prevents_spill.c": {"return_code": 0}, "chapter_20/int_only/with_coalescing/george_coalesce.c": {"return_code": 1}, "chapter_20/int_only/with_coalescing/briggs_coalesce.c": {"return_code": 2}, "chapter_20/int_only/with_coalescing/briggs_coalesce_tmps.c": {"return_code": 1}, "chapter_19/whole_pipeline/all_types/integer_promotions.c": {"return_code": 0}, "chapter_19/whole_pipeline/all_types/propagate_into_copytooffset.c": {"return_code": 0}, "chapter_19/whole_pipeline/all_types/propagate_into_store.c": {"return_code": 0}, "chapter_19/whole_pipeline/all_types/propagate_into_copyfromoffset.c": {"return_code": 0}, "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}}
\ No newline at end of file
diff --git a/test_framework/regalloc.py b/test_framework/regalloc.py
index 535a1d4d..3ae00bcb 100644
--- a/test_framework/regalloc.py
+++ b/test_framework/regalloc.py
@@ -302,7 +302,6 @@ class CoalesceTest(NamedTuple):
     "fourteen_pseudos_interfere.c": NoSpillTest(),
     "track_dbl_arg_registers.c": NoSpillTest(),
     "store_pointer_in_register.c": NoSpillTest(),
-    "funcall_generates_args.c": NoSpillTest(),
     "force_spill.c": SpillTest(
         max_spilled_instructions=3,
         max_spilled_pseudos=1,
diff --git a/test_properties.json b/test_properties.json
index 86490ef0..bef2fb22 100644
--- a/test_properties.json
+++ b/test_properties.json
@@ -431,8 +431,9 @@
         "chapter_20/int_only/no_coalescing/division_uses_ax.c": [
             "chapter_20/libraries/util.c"
         ],
-        "chapter_20/int_only/with_coalescing/funcall_generates_args.c": [
-            "chapter_20/libraries/funcall_generates_args_lib.c"
+        "chapter_20/int_only/no_coalescing/funcall_generates_args.c": [
+            "chapter_20/libraries/funcall_generates_args_lib.c",
+            "chapter_20/libraries/util.c"
         ],
         "chapter_20/int_only/no_coalescing/force_spill.c": [
             "chapter_20/libraries/util.c"
diff --git a/tests/chapter_20/int_only/no_coalescing/funcall_generates_args.c b/tests/chapter_20/int_only/no_coalescing/funcall_generates_args.c
new file mode 100644
index 00000000..99e64999
--- /dev/null
+++ b/tests/chapter_20/int_only/no_coalescing/funcall_generates_args.c
@@ -0,0 +1,39 @@
+/* Make sure we recognize that a function uses some parameter-passing registers,
+ * determined by its declaration. Don't inspect assembly, just validate behavior.
+ * NOTE: only works as intended after we've implemented register coalescing.
+ * */
+
+#include "util.h"
+
+// defined in funcall_generates_args_lib,
+// exits early with return code -1 if a and b don't have
+// the correc values
+int f(int a, int b);
+
+int glob = 10;
+int x = 0;
+int y = 0;
+int target(void) {
+    int a = glob + 1;
+    int b = glob + 2;
+    // We'll coalesce a and b with EDI/ESI because they're copied into those
+    // registers. If we don't recognize that EDI/ESI are live when we call f,
+    // we'll coalesce the temporaries that hold a * glob and b * glob
+    // with EDI/ESI too, since we'll generate the following assembly:
+    // movl  %a, %tmp
+    // imull %glob, %tmp
+    // movl  %tmp, %x
+    // and similar for y/b
+    x = a * glob;
+    y = b * glob;
+    // validate a and b
+    f(a, b);
+    // validate x and y
+    check_one_int(x, 110);
+    check_one_int(y, 120);
+    return 0;
+}
+
+int main(void) {
+    return target();
+}
\ No newline at end of file
diff --git a/tests/chapter_20/int_only/with_coalescing/funcall_generates_args.c b/tests/chapter_20/int_only/with_coalescing/funcall_generates_args.c
deleted file mode 100644
index 37e78525..00000000
--- a/tests/chapter_20/int_only/with_coalescing/funcall_generates_args.c
+++ /dev/null
@@ -1,24 +0,0 @@
-int f(int a, int b);
-
-int glob = 10;
-
-int target(void) {
-    static int x;
-    static int y;
-    int a = glob + 1;
-    int b = glob + 2;
-    // we'll coalesce a and b with edi/esi b/c they're passed as params
-    // and, if we don't recognize that EDI/ESI are live, we'll _ALSO_
-    // coalesce the temporaries that hold a * glob and b * glob with EDI/ESI too
-    x = a * glob;
-    y = b * glob;
-    int result = f(a, b);
-    // return result ==1 && x == 110 && y == 120;
-    if (result != 1)
-        return 1;
-    if (x != 110)
-        return 2;
-    if (y != 120)
-        return 3;
-    return 0;
-}
\ No newline at end of file
diff --git a/tests/chapter_20/libraries/funcall_generates_args_lib.c b/tests/chapter_20/libraries/funcall_generates_args_lib.c
index b0323b87..e364c061 100644
--- a/tests/chapter_20/libraries/funcall_generates_args_lib.c
+++ b/tests/chapter_20/libraries/funcall_generates_args_lib.c
@@ -1,3 +1,19 @@
+// helper function for funcall_generates_args
+
+#include <stdio.h>
+#include <stdlib.h>
+
+// a and b should be 11 and 12
 int f(int a, int b) {
-    return a == 11 && b == 12;
+    if (a != 11) {
+        printf("Expected a to be 11 but found %d\n", a);
+        exit(-1);
+    }
+
+    if (b != 12) {
+        printf("Expected b to be 12 but found %d\n", b);
+        exit(-1);
+    }
+
+    return 0;
 }
\ No newline at end of file