lib/std/start.zig                                                                                           |   2 +-
 src/Sema.zig                                                                                                | 175 ++++++++++++++++++++++++++++++--
 src/type.zig                                                                                                |   9 +-
 test/cases/compile_errors/c_pointer_to_void.zig                                                             |  11 ++
 test/cases/compile_errors/exported_enum_without_explicit_integer_tag_type.zig                               |  18 ++++
 test/cases/compile_errors/extern_struct_with_extern-compatible_but_inferred_integer_tag_type.zig            |  45 ++++++++
 test/cases/compile_errors/extern_struct_with_non-extern-compatible_integer_tag_type.zig                     |  17 ++++
 test/cases/compile_errors/invalid_optional_type_in_extern_struct.zig                                        |  11 ++
 test/cases/compile_errors/stage1/obj/exported_enum_without_explicit_integer_tag_type.zig                    |  15 ---
 test/cases/compile_errors/stage1/obj/extern_struct_with_extern-compatible_but_inferred_integer_tag_type.zig |  43 --------
 test/cases/compile_errors/stage1/obj/extern_struct_with_non-extern-compatible_integer_tag_type.zig          |  14 ---
 test/cases/compile_errors/stage1/obj/invalid_optional_type_in_extern_struct.zig                             |  10 --
 test/cases/compile_errors/stage1/obj/optional_pointer_to_void_in_extern_struct.zig                          |  14 ---
 test/cases/compile_errors/stage1/optional_pointer_to_void_in_extern_struct.zig                              |  14 +++
 14 files changed, 293 insertions(+), 105 deletions(-)