Unrolled build for rust-lang#132303

Rollup merge of rust-lang#132303 - nyurik:non-exhaustive-err, r=compiler-errors

More tests for non-exhaustive C-like enums in FFI

Add a few more tests for the `improper_ctypes` lint as found with the [varnish-rs](https://github.com/gquintard/varnish-rs) project.

This follows up on rust-lang#116831, fixed in rust-lang#116863 by ``@workingjubilee`` - I have been seeing these fail with the bindgen-generated non-exhaustive enums inside other structs. Seems the issue does not exist in the primary branch, so this PR just makes sure more cases are covered for the future.

Author: rust-timer

tests/ui/rfcs/rfc-2008-non-exhaustive/improper_ctypes/auxiliary/types.rs

@@ -38,3 +38,9 @@ pub enum NonExhaustiveCLikeEnum {
     Four = 4,
     Five = 5,
 }
+
+#[repr(C)]
+pub struct NormalStructWithNonExhaustiveCLikeEnum {
+    one: u8,
+    two: NonExhaustiveCLikeEnum,
+}

tests/ui/rfcs/rfc-2008-non-exhaustive/improper_ctypes/extern_crate_improper.rs

@@ -8,7 +8,7 @@ extern crate types;
 
 use types::{
     NonExhaustiveCLikeEnum, NonExhaustiveEnum, NonExhaustiveVariants,
-    NormalStruct, TupleStruct, UnitStruct,
+    NormalStruct, TupleStruct, UnitStruct, NormalStructWithNonExhaustiveCLikeEnum
 };
 
 extern "C" {
@@ -27,6 +27,9 @@ extern "C" {
 // These should pass without remark, as they're C-compatible, despite being "non-exhaustive".
 extern "C" {
     pub fn non_exhaustive_c_compat_enum(_: NonExhaustiveCLikeEnum);
+    pub fn non_exhaustive_c_compat_enum_ret() -> *mut NonExhaustiveCLikeEnum;
+    pub fn struct_w_non_exhaustive_c_like_enum(_: NormalStructWithNonExhaustiveCLikeEnum);
+    pub fn struct_w_non_exhaustive_c_like_enum_ret() -> *mut NormalStructWithNonExhaustiveCLikeEnum;
 }
 
 fn main() {}