create mode 100644 test/behavior/empty_union.zig
 delete mode 100644 test/cases/compile_errors/enum_with_0_fields.zig
 create mode 100644 test/cases/compile_errors/invalid_error_union_payload_type.zig
 create mode 100644 test/cases/compile_errors/invalid_optional_payload_type.zig
 create mode 100644 test/cases/compile_errors/noreturn_struct_field.zig
 delete mode 100644 test/cases/compile_errors/reify_type_for_exhaustive_enum_with_zero_fields.zig
 delete mode 100644 test/cases/compile_errors/reify_type_for_union_with_zero_fields.zig
 delete mode 100644 test/cases/compile_errors/union_fields_with_value_assignments.zig
 create mode 100644 test/cases/compile_errors/union_noreturn_field_initialized.zig
 delete mode 100644 test/cases/compile_errors/union_with_0_fields.zig
 delete mode 100644 test/cases/compile_errors/using_invalid_types_in_function_call_raises_an_error.zig