Auto merge of #139845 - Zalathar:rollup-u5u5y1v, r=Zalathar

Rollup of 17 pull requests

Successful merges:

 - #138374 (Enable contracts for const functions)
 - #138380 (ci: add runners for vanilla LLVM 20)
 - #138393 (Allow const patterns of matches to contain pattern types)
 - #139517 (std: sys: process: uefi: Use NULL stdin by default)
 - #139554 (std: add Output::exit_ok)
 - #139660 (compiletest: Add an experimental new executor to replace libtest)
 - #139669 (Overhaul `AssocItem`)
 - #139671 (Proc macro span API redesign: Replace proc_macro::SourceFile by Span::{file, local_file})
 - #139750 (std/thread: Use default stack size from menuconfig for NuttX)
 - #139772 (Remove `hir::Map`)
 - #139785 (Let CStrings be either 1 or 2 byte aligned.)
 - #139789 (do not unnecessarily leak auto traits in item bounds)
 - #139791 (drop global where-bounds before merging candidates)
 - #139798 (normalize: prefer `ParamEnv` over `AliasBound` candidates)
 - #139822 (Fix: Map EOPNOTSUPP to ErrorKind::Unsupported on Unix)
 - #139833 (Fix some HIR pretty-printing problems)
 - #139836 (Basic tests of MPMC receiver cloning)

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

compiler/rustc_mir_transform/src/check_undefined_transmutes.rs

@@ -42,7 +42,7 @@ impl<'a, 'tcx> UndefinedTransmutesChecker<'a, 'tcx> {
         if self.tcx.is_const_fn(def_id)
             || matches!(
                 self.tcx.opt_associated_item(def_id),
-                Some(AssocItem { kind: AssocKind::Const, .. })
+                Some(AssocItem { kind: AssocKind::Const { .. }, .. })
             )
         {
             let fn_sig = function.ty(self.body, self.tcx).fn_sig(self.tcx).skip_binder();

compiler/rustc_mir_transform/src/shim.rs

@@ -66,7 +66,7 @@ fn make_shim<'tcx>(tcx: TyCtxt<'tcx>, instance: ty::InstanceKind<'tcx>) -> Body<
             let call_mut = tcx
                 .associated_items(fn_mut)
                 .in_definition_order()
-                .find(|it| it.kind == ty::AssocKind::Fn)
+                .find(|it| it.is_fn())
                 .unwrap()
                 .def_id;