src/Sema.zig                                                                  | 105 ++++++++++++++++----------------
 test/behavior/union.zig                                                       |   1 -
 test/cases/compile_errors/helpful_return_type_error_message.zig               |  32 ++++++++++
 test/cases/compile_errors/stage1/test/helpful_return_type_error_message.zig   |  32 ----------
 test/cases/compile_errors/stage1/test/switching_with_non-exhaustive_enums.zig |  35 -----------
 test/cases/compile_errors/switching_with_non-exhaustive_enums.zig             |  42 +++++++++++++
 6 files changed, 127 insertions(+), 120 deletions(-)