src/Module.zig                                                                                | 11 ++++
 src/Sema.zig                                                                                  | 98 +++++++++++++++++++++++++++-----
 src/type.zig                                                                                  | 22 ++++++-
 test/cases/compile_errors/function_parameter_is_opaque.zig                                    | 30 ++++++++++
 test/cases/compile_errors/function_returning_opaque_type.zig                                  | 19 +++++++
 test/cases/compile_errors/function_with_non-extern_non-packed_enum_parameter.zig              | 11 ++++
 test/cases/compile_errors/function_with_non-extern_non-packed_struct_parameter.zig            | 14 +++++
 test/cases/compile_errors/function_with_non-extern_non-packed_union_parameter.zig             | 14 +++++
 test/cases/compile_errors/stage1/obj/function_parameter_is_opaque.zig                         | 29 ----------
 test/cases/compile_errors/stage1/obj/function_returning_opaque_type.zig                       | 19 -------
 test/cases/compile_errors/stage1/obj/function_with_non-extern_non-packed_enum_parameter.zig   |  8 ---
 test/cases/compile_errors/stage1/obj/function_with_non-extern_non-packed_struct_parameter.zig | 12 ----
 test/cases/compile_errors/stage1/obj/function_with_non-extern_non-packed_union_parameter.zig  | 12 ----
 13 files changed, 204 insertions(+), 95 deletions(-)