src/Sema.zig                                                    | 130 ++++++++++++++++++++++++++++----
 src/type.zig                                                    |  44 +++++++++++
 test/compile_errors/stage2/struct_duplicate_field_name.zig      |  15 ++++
 test/compile_errors/stage2/union_access_of_inactive_field.zig   |  14 ++++
 test/compile_errors/stage2/union_duplicate_enum_field.zig       |  16 ++++
 test/compile_errors/stage2/union_duplicate_field_definition.zig |  15 ++++
 test/compile_errors/stage2/union_enum_field_missing.zig         |  20 +++++
 test/compile_errors/stage2/union_extra_field.zig                |  19 +++++
 test/compile_errors/stage2/union_runtime_coercion_from_enum.zig |  22 ++++++
 9 files changed, 279 insertions(+), 16 deletions(-)