Auto merge of #136965 - jhpratt:rollup-bsnqvmf, r=jhpratt

Rollup of 8 pull requests

Successful merges:

 - #134999 (Add cygwin target.)
 - #136559 (Resolve named regions when reporting type test failures in NLL)
 - #136660 (Use a trait to enforce field validity for union fields + `unsafe` fields + `unsafe<>` binder types)
 - #136858 (Parallel-compiler-related cleanup)
 - #136881 (cg_llvm: Reduce visibility of all functions in the llvm module)
 - #136888 (Always perform discr read for never pattern in EUV)
 - #136948 (Split out the `extern_system_varargs` feature)
 - #136949 (Fix import in bench for wasm)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

compiler/rustc_abi/src/extern_abi.rs

@@ -195,7 +195,6 @@ impl ExternAbi {
         // * C and Cdecl obviously support varargs.
         // * C can be based on Aapcs, SysV64 or Win64, so they must support varargs.
         // * EfiApi is based on Win64 or C, so it also supports it.
-        // * System falls back to C for functions with varargs.
         //
         // * Stdcall does not, because it would be impossible for the callee to clean
         //   up the arguments. (callee doesn't know how many arguments are there)
@@ -204,7 +203,6 @@ impl ExternAbi {
         match self {
             Self::C { .. }
             | Self::Cdecl { .. }
-            | Self::System { .. }
             | Self::Aapcs { .. }
             | Self::Win64 { .. }
             | Self::SysV64 { .. }

compiler/rustc_borrowck/src/diagnostics/region_errors.rs

@@ -316,13 +316,16 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
                     let type_test_span = type_test.span;
 
                     if let Some(lower_bound_region) = lower_bound_region {
-                        let generic_ty = type_test.generic_kind.to_ty(self.infcx.tcx);
+                        let generic_ty = self.regioncx.name_regions(
+                            self.infcx.tcx,
+                            type_test.generic_kind.to_ty(self.infcx.tcx),
+                        );
                         let origin = RelateParamBound(type_test_span, generic_ty, None);
                         self.buffer_error(self.infcx.err_ctxt().construct_generic_bound_failure(
                             self.body.source.def_id().expect_local(),
                             type_test_span,
                             Some(origin),
-                            type_test.generic_kind,
+                            self.regioncx.name_regions(self.infcx.tcx, type_test.generic_kind),
                             lower_bound_region,
                         ));
                     } else {