diff --git a/expected_results.json b/expected_results.json
index e9f331d5..203f05be 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/compound_assign_through_pointer.c": {"return_code": 0}, "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": 0}, "chapter_13/valid/extra_credit/nan.c": {"return_code": 0}, "chapter_13/valid/extra_credit/compound_assign_implicit_cast.c": {"return_code": 0}, "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/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}, "chapter_16/valid/strings_as_lvalues/simple.c": {"return_code": 108}, "chapter_16/valid/strings_as_lvalues/adjacent_strings.c": {"return_code": 0, "stdout": "Hello, 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"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": 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}, "chapter_13/valid/extra_credit/incr_and_decr.c": {"return_code": 0}, "chapter_12/valid/extra_credit/unsigned_incr_decr.c": {"return_code": 0}, "chapter_14/valid/extra_credit/eval_compound_lhs_once.c": {"return_code": 0, "stdout": "A"}, "chapter_14/valid/extra_credit/incr_and_decr_through_pointer.c": {"return_code": 0}, "chapter_14/valid/extra_credit/bitwise_ops_with_dereferenced_ptrs.c": {"return_code": 0}, "chapter_14/valid/extra_credit/switch_dereferenced_pointer.c": {"return_code": 0}, "chapter_14/valid/extra_credit/bitshift_dereferenced_ptrs.c": {"return_code": 0}, "chapter_14/valid/extra_credit/compound_assign_conversion.c": {"return_code": 0}, "chapter_14/valid/extra_credit/compound_bitwise_dereferenced_ptrs.c": {"return_code": 0}, "chapter_12/valid/extra_credit/postfix_precedence.c": {"return_code": 0}, "chapter_15/valid/extra_credit/compound_lval_evaluated_once.c": {"return_code": 0}, "chapter_15/valid/extra_credit/compound_assign_to_nested_subscript.c": {"return_code": 0}, "chapter_15/valid/extra_credit/incr_and_decr_nested_pointers.c": {"return_code": 0}, "chapter_15/valid/extra_credit/incr_and_decr_pointers.c": {"return_code": 0}, "chapter_15/valid/extra_credit/compound_pointer_assignment.c": {"return_code": 0}, "chapter_15/valid/extra_credit/compound_nested_pointer_assignment.c": {"return_code": 0}, "chapter_15/valid/extra_credit/postfix_prefix_precedence.c": {"return_code": 0}, "chapter_15/valid/extra_credit/incr_decr_subscripted_vals.c": {"return_code": 0}, "chapter_15/valid/extra_credit/compound_assign_to_subscripted_val.c": {"return_code": 0}, "chapter_15/valid/extra_credit/compound_bitwise_subscript.c": {"return_code": 0}, "chapter_15/valid/extra_credit/compound_assign_array_of_pointers.c": {"return_code": 0}, "chapter_15/valid/extra_credit/bitwise_subscript.c": {"return_code": 0}, "chapter_15/valid/extra_credit/compound_assign_and_increment.c": {"return_code": 0}, "chapter_16/valid/extra_credit/incr_decr_unsigned_chars.c": {"return_code": 0}, "chapter_16/valid/extra_credit/promote_switch_cond_2.c": {"return_code": 0}, "chapter_16/valid/extra_credit/switch_on_char_const.c": {"return_code": 0}, "chapter_16/valid/extra_credit/incr_decr_chars.c": {"return_code": 0}, "chapter_16/valid/extra_credit/char_consts_as_cases.c": {"return_code": 0}, "chapter_16/valid/extra_credit/compound_bitwise_ops_chars.c": {"return_code": 0}, "chapter_16/valid/extra_credit/bitwise_ops_chars.c": {"return_code": 0}, "chapter_16/valid/extra_credit/bitwise_ops_character_constants.c": {"return_code": 0}, "chapter_16/valid/extra_credit/promote_switch_cond.c": {"return_code": 0}, "chapter_16/valid/extra_credit/compound_assign_chars.c": {"return_code": 0}, "chapter_16/valid/extra_credit/bitshift_chars.c": {"return_code": 0}}
\ No newline at end of file
diff --git a/test_properties.json b/test_properties.json
index 4855e55c..07c1f25b 100644
--- a/test_properties.json
+++ b/test_properties.json
@@ -850,13 +850,87 @@
             "compound"
         ],
         "chapter_15/valid/extra_credit/compound_assign_and_increment.c": [
-            "compound", "increment"
+            "compound",
+            "increment"
         ],
         "chapter_15/valid/extra_credit/compound_bitwise_subscript.c": [
-            "compound", "bitwise"
+            "compound",
+            "bitwise"
         ],
         "chapter_15/valid/extra_credit/bitwise_subscript.c": [
             "bitwise"
+        ],
+        "chapter_16/invalid_parse/extra_credit/string_literal_label.c": [
+            "goto"
+        ],
+        "chapter_16/invalid_parse/extra_credit/string_literal_goto.c": [
+            "goto"
+        ],
+        "chapter_16/invalid_parse/extra_credit/character_const_goto.c": [
+            "goto"
+        ],
+        "chapter_16/invalid_parse/extra_credit/character_const_label.c": [
+            "goto"
+        ],
+        "chapter_16/invalid_types/extra_credit/bit_shift_string.c": [
+            "bitwise"
+        ],
+        "chapter_16/invalid_types/extra_credit/bitwise_operation_on_string.c": [
+            "bitwise"
+        ],
+        "chapter_16/invalid_types/extra_credit/case_statement_string.c": [
+            "switch"
+        ],
+        "chapter_16/invalid_types/extra_credit/switch_on_string.c": [
+            "switch"
+        ],
+        "chapter_16/invalid_types/extra_credit/compound_assign_from_string.c": [
+            "compound"
+        ],
+        "chapter_16/invalid_types/extra_credit/compound_assign_to_string.c": [
+            "compound"
+        ],
+        "chapter_16/invalid_types/extra_credit/postfix_incr_string.c": [
+            "increment"
+        ],
+        "chapter_16/invalid_labels/extra_credit/duplicate_case_char_const.c": [
+            "switch"
+        ],
+        "chapter_16/invalid_types/extra_credit/prefix_incr_string.c": [
+            "increment"
+        ],
+        "chapter_16/valid/extra_credit/incr_decr_chars.c": [
+            "increment"
+        ],
+        "chapter_16/valid/extra_credit/incr_decr_unsigned_chars.c": [
+            "increment"
+        ],
+        "chapter_16/valid/extra_credit/compound_assign_chars.c": [
+            "compound"
+        ],
+        "chapter_16/valid/extra_credit/bitshift_chars.c": [
+            "bitwise"
+        ],
+        "chapter_16/valid/extra_credit/bitwise_ops_chars.c": [
+            "bitwise"
+        ],
+        "chapter_16/valid/extra_credit/bitwise_ops_character_constants.c": [
+            "bitwise"
+        ],
+        "chapter_16/valid/extra_credit/compound_bitwise_ops_chars.c": [
+            "bitwise", "compound"
+        ],
+        "chapter_16/valid/extra_credit/promote_switch_cond.c": [
+            "switch"
+        ],
+        "chapter_16/valid/extra_credit/promote_switch_cond_2.c": [
+            "switch"
+        ],
+        "chapter_16/valid/extra_credit/switch_on_char_const.c": [
+            "switch"
+        ],
+        "chapter_16/valid/extra_credit/char_consts_as_cases.c": [
+            "switch"
         ]
     },
     "requires_mathlib": [
diff --git a/tests/chapter_16/invalid_labels/extra_credit/duplicate_case_char_const.c b/tests/chapter_16/invalid_labels/extra_credit/duplicate_case_char_const.c
new file mode 100644
index 00000000..3a4f6da3
--- /dev/null
+++ b/tests/chapter_16/invalid_labels/extra_credit/duplicate_case_char_const.c
@@ -0,0 +1,13 @@
+// Reject duplicate cases where one uses an integer constant and one uses
+// a character constant
+int main(void) {
+    static int i = 120;
+    switch (i) {
+        case 'x':  // ASCII value 120
+            return 1;
+        case 120:  // duplicate
+            return 2;
+        default:
+            return 3;
+    }
+}
\ No newline at end of file
diff --git a/tests/chapter_16/invalid_parse/extra_credit/character_const_goto.c b/tests/chapter_16/invalid_parse/extra_credit/character_const_goto.c
new file mode 100644
index 00000000..abe443e5
--- /dev/null
+++ b/tests/chapter_16/invalid_parse/extra_credit/character_const_goto.c
@@ -0,0 +1,6 @@
+// You can't use a character constant as a label in a goto statement
+int main(void) {
+    goto 'x';
+    'x';
+    return 0;
+}
\ No newline at end of file
diff --git a/tests/chapter_16/invalid_parse/extra_credit/character_const_label.c b/tests/chapter_16/invalid_parse/extra_credit/character_const_label.c
new file mode 100644
index 00000000..0a895dfd
--- /dev/null
+++ b/tests/chapter_16/invalid_parse/extra_credit/character_const_label.c
@@ -0,0 +1,4 @@
+// You can't use a character constant as a label
+int main(void) {
+    'x': return 0;
+}
\ No newline at end of file
diff --git a/tests/chapter_16/invalid_parse/extra_credit/string_literal_goto.c b/tests/chapter_16/invalid_parse/extra_credit/string_literal_goto.c
new file mode 100644
index 00000000..9762b126
--- /dev/null
+++ b/tests/chapter_16/invalid_parse/extra_credit/string_literal_goto.c
@@ -0,0 +1,5 @@
+// You can't use a string literal as a label in a goto statement
+int main(void) {
+    goto "foo";
+    return 0;
+}
\ No newline at end of file
diff --git a/tests/chapter_16/invalid_parse/extra_credit/string_literal_label.c b/tests/chapter_16/invalid_parse/extra_credit/string_literal_label.c
new file mode 100644
index 00000000..20e7d01e
--- /dev/null
+++ b/tests/chapter_16/invalid_parse/extra_credit/string_literal_label.c
@@ -0,0 +1,4 @@
+// You can't use a string literal as a label
+int main(void) {
+    "foo": return 0;
+}
\ No newline at end of file
diff --git a/tests/chapter_16/invalid_types/extra_credit/bit_shift_string.c b/tests/chapter_16/invalid_types/extra_credit/bit_shift_string.c
new file mode 100644
index 00000000..b1aed327
--- /dev/null
+++ b/tests/chapter_16/invalid_types/extra_credit/bit_shift_string.c
@@ -0,0 +1,5 @@
+// can't apply << or >> to strings
+int main(void) {
+    "foo" << 3;
+    return 0;
+}
\ No newline at end of file
diff --git a/tests/chapter_16/invalid_types/extra_credit/bitwise_operation_on_string.c b/tests/chapter_16/invalid_types/extra_credit/bitwise_operation_on_string.c
new file mode 100644
index 00000000..7761bb19
--- /dev/null
+++ b/tests/chapter_16/invalid_types/extra_credit/bitwise_operation_on_string.c
@@ -0,0 +1,5 @@
+// Can't apply bitwise operations to strings
+int main(void) {
+    "My string" & 100;
+    return 0;
+}
\ No newline at end of file
diff --git a/tests/chapter_16/invalid_types/extra_credit/case_statement_string.c b/tests/chapter_16/invalid_types/extra_credit/case_statement_string.c
new file mode 100644
index 00000000..bf382e0f
--- /dev/null
+++ b/tests/chapter_16/invalid_types/extra_credit/case_statement_string.c
@@ -0,0 +1,9 @@
+// Can't use strings as labels for case statements
+int main(void) {
+    switch (0) {
+        case "foo":
+            return 1;
+        default:
+            return 0;
+    }
+}
\ No newline at end of file
diff --git a/tests/chapter_16/invalid_types/extra_credit/compound_assign_from_string.c b/tests/chapter_16/invalid_types/extra_credit/compound_assign_from_string.c
new file mode 100644
index 00000000..dd974082
--- /dev/null
+++ b/tests/chapter_16/invalid_types/extra_credit/compound_assign_from_string.c
@@ -0,0 +1,6 @@
+// Can't use a string on the right side of a compound assignment expression
+int main(void) {
+    char * s =  "some string ";
+    s += "another str";
+    return 0;
+}
\ No newline at end of file
diff --git a/tests/chapter_16/invalid_types/extra_credit/compound_assign_to_string.c b/tests/chapter_16/invalid_types/extra_credit/compound_assign_to_string.c
new file mode 100644
index 00000000..8fcbaab3
--- /dev/null
+++ b/tests/chapter_16/invalid_types/extra_credit/compound_assign_to_string.c
@@ -0,0 +1,5 @@
+// Can't compound assign to string literal
+int main(void) {
+    "My string" += 1;
+    return 0;
+}
\ No newline at end of file
diff --git a/tests/chapter_16/invalid_types/extra_credit/postfix_incr_string.c b/tests/chapter_16/invalid_types/extra_credit/postfix_incr_string.c
new file mode 100644
index 00000000..f1fde317
--- /dev/null
+++ b/tests/chapter_16/invalid_types/extra_credit/postfix_incr_string.c
@@ -0,0 +1,5 @@
+// can't apply postfix ++/-- to string literals
+int main(void) {
+    "foo"++;
+    return 0;
+}
\ No newline at end of file
diff --git a/tests/chapter_16/invalid_types/extra_credit/prefix_incr_string.c b/tests/chapter_16/invalid_types/extra_credit/prefix_incr_string.c
new file mode 100644
index 00000000..0f5b0d41
--- /dev/null
+++ b/tests/chapter_16/invalid_types/extra_credit/prefix_incr_string.c
@@ -0,0 +1,5 @@
+// Can't apply prefix ++/-- to string literal
+int main(void) {
+    ++"foo";
+    return 0;
+}
\ No newline at end of file
diff --git a/tests/chapter_16/invalid_types/extra_credit/switch_on_string.c b/tests/chapter_16/invalid_types/extra_credit/switch_on_string.c
new file mode 100644
index 00000000..68c278b4
--- /dev/null
+++ b/tests/chapter_16/invalid_types/extra_credit/switch_on_string.c
@@ -0,0 +1,7 @@
+// can't use string literal as controlling expression in switch statement
+int main(void) {
+    switch ("foo") {
+        default:
+        return 0;
+    }
+}
\ No newline at end of file
diff --git a/tests/chapter_16/valid/extra_credit/bitshift_chars.c b/tests/chapter_16/valid/extra_credit/bitshift_chars.c
new file mode 100644
index 00000000..2ed82a60
--- /dev/null
+++ b/tests/chapter_16/valid/extra_credit/bitshift_chars.c
@@ -0,0 +1,38 @@
+// Test << and >> operators with chars (or mix of chars and other types)
+// Make sure left operand is promoted from char to int (NOTE: right operand should
+// be too but we can't verify that; it doesn't change the operand's value or
+// the result value.)
+
+int main(void) {
+    unsigned char uc = 255;
+
+    // uc is promoted to int
+    //if ((uc << 20) != 267386880) {
+    //    return 1; // fail
+   // }
+
+    // uc is promoted to int, then shifted
+    if ((uc >> 3) != 31) {
+        return 2; // fail
+    }
+
+    signed char sc = -127;
+    char c = 5;
+    // sc is promoted to int, then shifted
+    if ((sc >> c) != -4) {
+        return 3;  // fail
+    }
+
+    // make sure c << 3ul is promoted to int, not unsigned long
+    if (((-(c << 3ul)) >> 3) != -5) {
+        return 4;  // fail
+    }
+
+    // make sure uc << 5u is promoted to int, not unsigned int
+    if ((-(uc << 5u) >> 5u) != -255l) {
+        return 5; // fail
+    }
+
+    return 0; // fail
+
+}
\ No newline at end of file
diff --git a/tests/chapter_16/valid/extra_credit/bitwise_ops_character_constants.c b/tests/chapter_16/valid/extra_credit/bitwise_ops_character_constants.c
new file mode 100644
index 00000000..a7a1bf01
--- /dev/null
+++ b/tests/chapter_16/valid/extra_credit/bitwise_ops_character_constants.c
@@ -0,0 +1,35 @@
+#ifdef SUPPRESS_WARNINGS
+#ifdef __clang__
+#pragma clang diagnostic ignored "-Wconstant-conversion"
+#else
+#pragma GCC diagnostic ignored "-Woverflow"
+#endif
+#endif
+
+// Test that we can use character constants in bitwise operations
+int main(void) {
+    int x = 10;
+    if ((x ^ 'A') != 75) {
+        return 1;  // fail
+    }
+
+    static char c = 132;  // converted to -124
+    if (('!' | c) != -91) {
+        return 2;  // fail
+    }
+
+    static unsigned long ul = 9259400834947493926ul;
+    if ((ul & '~') != 38) {
+        return 3;  // fail
+    }
+
+    if ((ul << ' ') != 4611738958194278400ul) {
+        return 4;  // fail
+    }
+
+    if (('{' >> 3) != 15) {
+        return 5;  // fail
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/tests/chapter_16/valid/extra_credit/bitwise_ops_chars.c b/tests/chapter_16/valid/extra_credit/bitwise_ops_chars.c
new file mode 100644
index 00000000..999dd6dd
--- /dev/null
+++ b/tests/chapter_16/valid/extra_credit/bitwise_ops_chars.c
@@ -0,0 +1,29 @@
+// make sure we perform integer promotions when performing bitwise operations on
+// chars
+
+int main(void) {
+    unsigned char uc = 135;
+    char c = -116;
+    // Make sure we FIRST promote, THEN perform bitwise op
+    // if we performed the bitwise op first and then sign-extended,
+    // we'd get a different result
+    if ((uc & c) != 132) {
+        return 1;  // fail
+    }
+
+    // Make sure we FIRST promote, THEN perform bitwise op
+    // if we performed the bitwise op first and then zero-extended,
+    // we'd get a different result
+    if ((uc | c) != -113) {
+        return 2;  // fail
+    }
+
+    // make sure we do usual conversion to common type
+    // (result of c ^ 1001u is unsigned int, so we zero-extend it
+    // for next operation)
+    if (((c ^ 1001u) | 360l) != 4294966637) {
+        return 3; // fail
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/tests/chapter_16/valid/extra_credit/char_consts_as_cases.c b/tests/chapter_16/valid/extra_credit/char_consts_as_cases.c
new file mode 100644
index 00000000..950ef63b
--- /dev/null
+++ b/tests/chapter_16/valid/extra_credit/char_consts_as_cases.c
@@ -0,0 +1,16 @@
+// Test that we can use character constants as cases in switch statements
+int main(void) {
+    static int i = 65;
+    switch (i) {
+        case 100l:
+            return 1;  // fail
+        case 'A':
+            return 0;  // success
+        case 'B':
+            return 2;  // fail
+        case 2000u:
+            return 3;  // fail
+        default:
+            return -1;  // fail
+    }
+}
\ No newline at end of file
diff --git a/tests/chapter_16/valid/extra_credit/compound_assign_chars.c b/tests/chapter_16/valid/extra_credit/compound_assign_chars.c
new file mode 100644
index 00000000..3e1a5d00
--- /dev/null
+++ b/tests/chapter_16/valid/extra_credit/compound_assign_chars.c
@@ -0,0 +1,35 @@
+// Test compound assignment with characters; make sure we perform integer promotions
+
+int main(void) {
+
+    char c = 100;
+    char c2 = 100;
+    c += c2; // well-defined b/c of integer promotions
+    if (c != -56) {
+        return 1; // fail
+    }
+
+    unsigned char uc = 200;
+    c2 = -100;
+    uc /= c2; // convert uc and c2 to int, then convert back
+    if (uc != 254) {
+        return 2; // fail
+    }
+
+    uc -= 250.0; // convert uc to double, do operation, convert back
+    if (uc != 4) {
+         return 3;  // fail
+    }
+
+    signed char sc = -70;
+    sc *= c;
+    if (sc != 80) {
+        return 4; // fail
+    }
+
+    if ((sc %= c) != 24) {
+        return 5;
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/tests/chapter_16/valid/extra_credit/compound_bitwise_ops_chars.c b/tests/chapter_16/valid/extra_credit/compound_bitwise_ops_chars.c
new file mode 100644
index 00000000..ec69d853
--- /dev/null
+++ b/tests/chapter_16/valid/extra_credit/compound_bitwise_ops_chars.c
@@ -0,0 +1,71 @@
+#ifdef SUPPRESS_WARNINGS
+#ifdef __clang__
+#pragma clang diagnostic ignored "-Wshift-count-overflow"
+#endif
+#endif
+// Test bitwise compound assignment operators with character types
+
+int main(void) {
+    signed char arr[5] = {-128, -120, -2, 1, 120};
+    unsigned char u_arr[4] = {0, 170, 250, 255};
+
+
+    // apply bitwise ops to signed chars
+    arr[0] ^= 12345;
+    arr[1] |= u_arr[3];
+    arr[2] &= u_arr[1] - (unsigned char) 185;
+    arr[3] <<= 7u; // this wraps around to -128, but is well-defined b/c of integer promotions
+    static long x = 32;
+    // it's undefined for shift count to be greater than width of left operand,
+    // but this is well-defined b/c of integer promotions
+    arr[4] >>= 31;
+
+    // apply bitwise ops to unsigned chars
+
+    // it's undefined for shift count to be greater than width of left operand,
+    // but this is well-defined b/c of integer promotions
+    u_arr[3] <<= 12;
+    u_arr[2] >>= (x - 1);
+    u_arr[1] |= -399; // doesn't overflow b/c of integer promotion
+    x = -4296140120l; // a number that doesn't fit in int or unsigned int
+    u_arr[0] ^= x;
+
+    // validate them
+    if (arr[0] != -71) {
+        return 1; // fail
+    }
+
+    if (arr[1] != -1) {
+        return 2; // fail
+    }
+
+    if (arr[2] != -16) {
+        return 3; // fail
+    }
+
+    if (arr[3] != -128) {
+        return 4; // fail
+    }
+
+    if (arr[4] != 0) {
+        return 5;
+    }
+
+    if (u_arr[0] != 168) {
+        return 6;
+    }
+
+    if (u_arr[1] != 251) {
+        return 7;
+    }
+
+    if (u_arr[2] != 0) {
+        return 8;
+    }
+
+    if (u_arr[3] != 0) {
+        return 9;
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/tests/chapter_16/valid/extra_credit/incr_decr_chars.c b/tests/chapter_16/valid/extra_credit/incr_decr_chars.c
new file mode 100644
index 00000000..947a1baa
--- /dev/null
+++ b/tests/chapter_16/valid/extra_credit/incr_decr_chars.c
@@ -0,0 +1,53 @@
+// Increment and decrement lvalues of character type
+int main(void) {
+    static char chars[5] = {123, 124, 125, 126, 127};
+    if (chars[0]++ != 123) {
+        return 1;  // fail
+    }
+
+    if (chars[1]-- != 124) {
+        return 2;  // fail
+    }
+
+    if (++chars[2] != 126) {
+        return 3;  // fail
+    }
+
+    if (--chars[3] != 125) {
+        return 4;  // fail
+    }
+
+    // NOTE: this is not undefined because we perform the usual arithmetic
+    // conversions before incrementing, then perform implementation-defined
+    // conversion back to character type, so there's no integer overflow
+    if (++chars[4] != -128) {
+        return 5;  // fail
+    }
+
+    // validate all 5 elements
+    if (chars[0] != 124) {
+        return 6;  // fail
+    }
+
+    if (chars[1] != 123) {
+        return 7;  // fail
+    }
+    if (chars[2] != 126) {
+        return 8;  // fail
+    }
+    if (chars[3] != 125) {
+        return 9;  // fail
+    }
+    if (chars[4] != -128) {
+        return 10;  // fail
+    }
+
+    // make sure decrementing CHAR_MIN also wraps around as expected
+    signed char c = -128;
+    c--;
+    if (c != 127) {
+        return 11;  // fail
+    }
+
+    return 0;  // success
+}
\ No newline at end of file
diff --git a/tests/chapter_16/valid/extra_credit/incr_decr_unsigned_chars.c b/tests/chapter_16/valid/extra_credit/incr_decr_unsigned_chars.c
new file mode 100644
index 00000000..fe4e6847
--- /dev/null
+++ b/tests/chapter_16/valid/extra_credit/incr_decr_unsigned_chars.c
@@ -0,0 +1,44 @@
+// Increment and decrement lvalues of unsigned character type
+int main(void) {
+    unsigned char chars[5] = {0, 2, 4, 253, 255};
+
+    // validate expression results
+    if (chars[0]--) {  // result is 0
+        return 1;      // fail
+    }
+
+    if (chars[1]++ != 2) {
+        return 2;  // fail
+    }
+
+    if (--chars[3] != 252) {
+        return 3;
+    }
+
+    if (++chars[4] != 0) {  // wraps around
+        return 4;
+    }
+
+    // validate side effects/updated values
+    if (chars[0] != 255) {  // wraps around
+        return 5;
+    }
+
+    if (chars[1] != 3) {
+        return 6;
+    }
+
+    if (chars[2] != 4) {  // we didn't change this one
+        return 7;
+    }
+
+    if (chars[3] != 252) {
+        return 8;
+    }
+
+    if (chars[4]) {
+        return 9;
+    }
+
+    return 0;  // success
+}
\ No newline at end of file
diff --git a/tests/chapter_16/valid/extra_credit/promote_switch_cond.c b/tests/chapter_16/valid/extra_credit/promote_switch_cond.c
new file mode 100644
index 00000000..62db5662
--- /dev/null
+++ b/tests/chapter_16/valid/extra_credit/promote_switch_cond.c
@@ -0,0 +1,25 @@
+#ifdef SUPPRESS_WARNINGS
+#ifdef __clang__
+#pragma clang diagnostic ignored "-Wswitch"
+#else
+#pragma GCC diagnostic ignored "-Woverflow"
+#endif
+#endif
+
+// Make sure we promote the controlling condition in a switch statement from
+// character type to int
+
+int main(void) {
+    char c = 100;
+    switch (c) {
+        case 0:
+            return 1;
+        case 100:
+            return 0;
+        // not a duplicate of 100, b/c we're not converting cases to char type
+        case 356:
+            return 2;
+        default:
+            return 3;
+    }
+}
\ No newline at end of file
diff --git a/tests/chapter_16/valid/extra_credit/promote_switch_cond_2.c b/tests/chapter_16/valid/extra_credit/promote_switch_cond_2.c
new file mode 100644
index 00000000..9a39e881
--- /dev/null
+++ b/tests/chapter_16/valid/extra_credit/promote_switch_cond_2.c
@@ -0,0 +1,21 @@
+#ifdef SUPPRESS_WARNINGS
+#ifdef __clang__
+#pragma clang diagnostic ignored "-Wswitch"
+#else
+#pragma GCC diagnostic ignored "-Woverflow"
+#endif
+#endif
+
+// Another test that we promote switch controlling condition to integer type;
+// make sure case statements are converted to int rather than char
+int main(void) {
+    char c = -56;
+    switch (c) {
+        // if we reduced this to a char it would be -56
+        // but we won't, so this case shouldn't be taken
+        case 33554632:
+            return 1;  // fail
+        default:
+            return 0;
+    }
+}
\ No newline at end of file
diff --git a/tests/chapter_16/valid/extra_credit/switch_on_char_const.c b/tests/chapter_16/valid/extra_credit/switch_on_char_const.c
new file mode 100644
index 00000000..691f71ad
--- /dev/null
+++ b/tests/chapter_16/valid/extra_credit/switch_on_char_const.c
@@ -0,0 +1,13 @@
+// Test that we can use character constant in switch statement
+int main(void) {
+    switch ('x') {
+        case 1:
+            return 1;  // fail
+        case 2:
+            return 2;  // fail
+        case 120:
+            return 0;  // success
+        default:
+            return -1;  // fail
+    }
+}
\ No newline at end of file