diff --git a/expected_results.json b/expected_results.json
index 424dc949..cb2db830 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_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": 0}, "chapter_20/int_only/with_coalescing/briggs_coalesce.c": {"return_code": 0}, "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}, "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}, "chapter_12/valid/extra_credit/compound_bitwise.c": {"return_code": 0}, "chapter_12/valid/extra_credit/compound_bitshift.c": {"return_code": 0}, "chapter_11/valid/extra_credit/compound_bitwise.c": {"return_code": 0}, "chapter_11/valid/extra_credit/compound_bitshift.c": {"return_code": 0}}
\ No newline at end of file
diff --git a/test_properties.json b/test_properties.json
index 348ea1d8..54011dd5 100644
--- a/test_properties.json
+++ b/test_properties.json
@@ -591,6 +591,9 @@
         "chapter_11/invalid_labels/extra_credit/switch_duplicate_cases_2.c": [
             "switch"
         ],
+        "chapter_11/invalid_labels/extra_credit/bitshift_duplicate_cases.c": [
+            "switch", "bitwise"
+        ],
         "chapter_11/valid/extra_credit/bitwise_long_op.c": [
             "bitwise"
         ],
@@ -606,13 +609,19 @@
         "chapter_11/valid/extra_credit/increment_long.c": [
             "increment"
         ],
+        "chapter_11/valid/extra_credit/compound_bitshift.c": [
+            "bitwise", "compound"
+        ],
+        "chapter_11/valid/extra_credit/compound_bitwise.c": [
+            "bitwise", "compound"
+        ],
         "chapter_11/valid/extra_credit/switch_int.c": [
             "switch"
         ],
         "chapter_11/valid/extra_credit/switch_long.c": [
             "switch"
         ],
-        "chapter_12/invalid_labels/extra_credit/switch_duplicate_case.c": [
+        "chapter_12/invalid_labels/extra_credit/switch_duplicate_cases.c": [
             "switch"
         ],
         "chapter_12/valid/extra_credit/bitwise_unsigned_ops.c": [
@@ -624,6 +633,12 @@
         "chapter_12/valid/extra_credit/compound_assign_uint.c": [
             "compound"
         ],
+        "chapter_12/valid/extra_credit/compound_bitshift.c": [
+            "compound", "bitwise"
+        ],
+        "chapter_12/valid/extra_credit/compound_bitwise.c": [
+            "compound", "bitwise"
+        ],
         "chapter_12/valid/extra_credit/switch_uint.c": [
             "switch"
         ],
diff --git a/tests/chapter_11/invalid_labels/extra_credit/bitshift_duplicate_cases.c b/tests/chapter_11/invalid_labels/extra_credit/bitshift_duplicate_cases.c
new file mode 100644
index 00000000..ac5a838c
--- /dev/null
+++ b/tests/chapter_11/invalid_labels/extra_credit/bitshift_duplicate_cases.c
@@ -0,0 +1,15 @@
+// Test that we correctly infer type of bitshift expression;
+// x << y has type of x, not common type of x and y
+
+int main(void) {
+    int x = 100;
+    switch (x << 2l) {  // x << 2 == 400
+        // these cases are duplicates b/c they'll both be converted to
+        // the type of the switch expression - which is int, NOT long
+        case 34359738768l:  // 2**35 + 400
+            return 1;
+        case 400:
+            return 0;
+    }
+    return 10;
+}
\ 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
index 935149a5..6fee17ea 100644
--- a/tests/chapter_11/valid/extra_credit/bitshift.c
+++ b/tests/chapter_11/valid/extra_credit/bitshift.c
@@ -18,6 +18,12 @@ int main(void) {
         return 3;
     }
 
+    // try shift count > 32 (shift count between 32 and 64 is undefined when
+    // shifting an int, well-defined when shifting a long)
+    if ((40l << 40) !=  43980465111040l) {
+        return 4;
+    }
+
     // 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
@@ -32,21 +38,21 @@ int main(void) {
 
     // should be -2^28
     if (i >> long_shiftcount != -268435456) {
-        return 4;
+        return 5;
     }
 
     i = -1;
     if (i >> 10l != -1) {
-        return 5;
+        return 6;
     }
 
     // make sure we didn't shift any bits into i's neighbors
     if (i_neighbor1) {
-        return 6;
+        return 7;
     }
 
     if (i_neighbor2) {
-        return 7;
+        return 8;
     }
 
     return 0;
diff --git a/tests/chapter_11/valid/extra_credit/compound_bitshift.c b/tests/chapter_11/valid/extra_credit/compound_bitshift.c
new file mode 100644
index 00000000..9ad77145
--- /dev/null
+++ b/tests/chapter_11/valid/extra_credit/compound_bitshift.c
@@ -0,0 +1,34 @@
+// Test compound bit shift operators with mix of types
+
+int main(void) {
+
+    // shift int using long shift count
+    int x = 100;
+    x <<= 22l;
+    if (x != 419430400) {
+        return 1; // fail
+    }
+
+    // try right shift; validate result of expression
+    if ((x >>= 4l) != 26214400) {
+        return 2; // fail
+    }
+
+    // also validate side effect of updating variable
+    if (x != 26214400) {
+        return 3;
+    }
+
+    // now try shifting a long with an int shift count
+    long l = 12345l;
+    if ((l <<= 33) != 106042742538240l) {
+        return 4;
+    }
+
+    l = -l;
+    if ((l >>= 10) != -103557365760l) {
+        return 5;
+    }
+
+    return 0; // success
+}
\ No newline at end of file
diff --git a/tests/chapter_11/valid/extra_credit/compound_bitwise.c b/tests/chapter_11/valid/extra_credit/compound_bitwise.c
new file mode 100644
index 00000000..ae533e2e
--- /dev/null
+++ b/tests/chapter_11/valid/extra_credit/compound_bitwise.c
@@ -0,0 +1,49 @@
+int main(void) {
+
+    // bitwise compound operations on long integers
+    long l1 = 71777214294589695l;  // 0x00ff00ff00ff00ff
+    long l2 = -4294967296;  // -2^32; upper 32 bits are 1, lower 32 bits are 0
+
+    l1 &= l2;
+    if (l1 != 71777214277877760l) {
+        return 1; // fail
+    }
+
+    l2 |= 100l;
+    if (l2 != -4294967196) {
+        return 2;
+    }
+
+    l1 ^= -9223372036854775807l;
+    if (l1 != -9151594822576898047l /* 0x80ff00ff00000001 */ ) {
+        return 3;
+    }
+
+    // if rval is int, convert to common type
+    l1 = 4611686018427387903l;  // 0x3fffffffffffffff
+    int i =  -1073741824;  // 0b1100....0, or 0xc0000000
+    // 1. sign-extend i to 64 bits; upper 32 bits are all 1s
+    // 2. take bitwise AND of sign-extended value with l1
+    // 3. result (stored in l1) is 3fffffffc0000000;
+    //    upper bits match l1, lower bits match i
+    l1 &= i;
+    if (l1 != 4611686017353646080l) {
+        return 4;
+    }
+
+    // if lval is int, convert to common type, perform operation, then convert back
+    i = -2147483648l; // 0x80000000
+    // check result and side effect
+    // 1. sign extend 0x80000000 to 0x0000000080000000
+    // 2. calculate 0x0000000080000000 | 0x00ff00ff00ff00ff = 0x000ff00ff80ff00ff
+    // 3. truncate to 0x80ff00ff on assignment
+    if ((i |= 71777214294589695l) != -2130771713) {
+        return 5;
+    }
+    if (i != -2130771713) {
+        return 6;
+    }
+
+    return 0; // success
+
+}
\ No newline at end of file
diff --git a/tests/chapter_12/invalid_labels/extra_credit/switch_duplicate_cases.c b/tests/chapter_12/invalid_labels/extra_credit/switch_duplicate_cases.c
index 3aa1f9c2..ea29da13 100644
--- a/tests/chapter_12/invalid_labels/extra_credit/switch_duplicate_cases.c
+++ b/tests/chapter_12/invalid_labels/extra_credit/switch_duplicate_cases.c
@@ -4,7 +4,7 @@ int main(void) {
     switch(ui) {
         case 4294967295u: // 2^32 - 1
             return 0;
-        case -1l: // this will be converted to 2^32 - 1
+        case 1099511627775l: // 0xffffffffff; this will be converted to 2^32 - 1
             return 1;
         default: return 2;
     }
diff --git a/tests/chapter_12/valid/extra_credit/bitwise_unsigned_shift.c b/tests/chapter_12/valid/extra_credit/bitwise_unsigned_shift.c
index 6feccfd9..974b963a 100644
--- a/tests/chapter_12/valid/extra_credit/bitwise_unsigned_shift.c
+++ b/tests/chapter_12/valid/extra_credit/bitwise_unsigned_shift.c
@@ -1,13 +1,24 @@
-/* Bit-shift operations do not perform the usual arithmetic conversions. */
+/* Tests for bit-shift operations on unsigned integers */
 
 int main(void) {
+
     unsigned int ui = -1u; // 2^32 - 1, or 4294967295
 
-    /* shifting left by 2 is like subtracting 3.
-     * note that we don't cast ui to a long first
+    /* Shifting left by 2 is like subtracting 3;
+     * note that we don't cast ui to a long first.
+     * Also note that the result wraps around; it's
+     * equivalent to (ui * 2^2) % UINT_MAX.
      */
     if ((ui << 2l) != 4294967292) {
         return 1;
     }
+
+    /* Shifting right by 2 is like dividing by 4;
+     * note that we need to use shr (logical shift) instruction
+     * rather than sar (arithmetic shift) instruction  */
+    if ((ui >> 2) != 1073741823) {
+        return 2;
+    }
+
     return 0; // success
 }
\ No newline at end of file
diff --git a/tests/chapter_12/valid/extra_credit/compound_bitshift.c b/tests/chapter_12/valid/extra_credit/compound_bitshift.c
new file mode 100644
index 00000000..6114ec89
--- /dev/null
+++ b/tests/chapter_12/valid/extra_credit/compound_bitshift.c
@@ -0,0 +1,18 @@
+int main(void) {
+
+    // make sure we don't convert to common type before performing shift operation
+    int i = -2;
+    // don't convert i to common (unsigned) type; if we do, we'll use logical
+    // instead of arithmetic shift, leading to wrong result
+    i >>= 3u;
+    if (i != -1) {
+        return 1;
+    }
+
+    unsigned long ul = 18446744073709551615UL;  // 2^64 - 1
+    ul <<= 44;                                  // 0 out lower 44 bits
+    if (ul != 18446726481523507200ul) {
+        return 2;  // fail
+    }
+    return 0;  // success
+}
\ No newline at end of file
diff --git a/tests/chapter_12/valid/extra_credit/compound_bitwise.c b/tests/chapter_12/valid/extra_credit/compound_bitwise.c
new file mode 100644
index 00000000..ac2328e9
--- /dev/null
+++ b/tests/chapter_12/valid/extra_credit/compound_bitwise.c
@@ -0,0 +1,42 @@
+int main(void) {
+
+    unsigned long ul = 18446460386757245432ul; // 0xfffefdfcfbfaf9f8
+    ul &= -1000; // make sure we sign-extend -1000 to unsigned long
+    if (ul != 18446460386757244952ul /* 0xfffefdfcfbfaf818 */) {
+        return 1; // fail
+    }
+
+    ul |= 4294967040u; // 0xffffff00 - make sure we zero-extend this to unsigned long
+
+    if (ul != 18446460386824683288ul /* 0xfffefdfcffffff18 */) {
+        return 2; // fail
+    }
+
+    // make sure that we convert result _back_ to type of lvalue,
+    // and that we don't clobber nearby values (e.g. by trying to assign 8-byte)
+    // result to four-byte ui variable
+    int i = 123456;
+    unsigned int ui = 4042322160u; // 0xf0f0f0f0
+    long l = -252645136; // 0xffffffffff0f0f0f0
+    // 1. zero-extend ui to 8-bytes
+    // 2. XOR w/ l, resulting in 0xffffffff00000000
+    // 3. truncate back to 4 bytes, resulting in 0
+    // then check value of expression (i.e. value of ui)
+    if (ui ^= l) {
+        return 3; // fail
+    }
+
+    // check side effect (i.e. updating ui)
+    if (ui) {
+        return 4; // fail
+    }
+    // check neighbors
+    if (i != 123456) {
+        return 5;
+    }
+    if (l != -252645136) {
+        return 6;
+    }
+
+    return 0; // success
+}
\ No newline at end of file