src/AstGen.zig                                                                        | 21 +++++---
 src/Module.zig                                                                        | 31 +++++++++++-
 src/Sema.zig                                                                          | 84 +++++++++++++++++++-------------
 test/cases/compile_errors/extern_union_given_enum_tag_type.zig                        | 20 ++++++++
 test/cases/compile_errors/non-enum_tag_type_passed_to_union.zig                       | 13 +++++
 test/cases/compile_errors/non-integer_tag_type_to_automatic_union_enum.zig            | 13 +++++
 test/cases/compile_errors/non-integer_tag_type_to_enum.zig                            | 13 +++++
 test/cases/compile_errors/stage1/obj/extern_union_given_enum_tag_type.zig             | 20 --------
 test/cases/compile_errors/stage1/obj/non-enum_tag_type_passed_to_union.zig            | 13 -----
 test/cases/compile_errors/stage1/obj/non-integer_tag_type_to_automatic_union_enum.zig | 13 -----
 test/cases/compile_errors/stage2/union_enum_field_missing.zig                         |  2 +-
 test/cases/compile_errors/stage2/union_extra_field.zig                                |  2 +-
 test/cases/compile_errors/switch_expression-missing_enumeration_prong.zig             |  2 +-
 test/cases/compile_errors/switch_on_enum_with_1_field_with_no_prongs.zig              |  2 +-
 test/cases/compile_errors/switching_with_non-exhaustive_enums.zig                     |  2 +-
 test/cases/compile_errors/union_with_specified_enum_omits_field.zig                   |  2 +-
 test/stage2/cbe.zig                                                                   |  2 +-
 17 files changed, 159 insertions(+), 96 deletions(-)