Auto merge of #122454 - matthiaskrgr:rollup-xbmufdc, r=matthiaskrgr

Rollup of 11 pull requests

Successful merges:

 - #122422 (compiletest: Allow `only-unix` in test headers)
 - #122424 (fix: typos)
 - #122425 (Increase timeout for new bors bot)
 - #122426 (Fix StableMIR `WrappingRange::is_full` computation)
 - #122429 (Add Exploit Mitigations PG to triagebot.toml)
 - #122430 (Generate link to `Local` in `hir::Let` documentation)
 - #122434 (pattern analysis: rename a few types)
 - #122437 (pattern analysis: remove `MaybeInfiniteInt::JustAfterMax`)
 - #122438 (Safe Transmute: Require that source referent is smaller than destination)
 - #122442 (extend docs of -Zprint-mono-items)
 - #122449 (Delay a bug for stranded opaques)

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

compiler/rustc_hir_analysis/src/check/check.rs

@@ -381,11 +381,17 @@ fn check_opaque_meets_bounds<'tcx>(
     match ocx.eq(&misc_cause, param_env, opaque_ty, hidden_ty) {
         Ok(()) => {}
         Err(ty_err) => {
+            // Some types may be left "stranded" if they can't be reached
+            // from an astconv'd bound but they're mentioned in the HIR. This
+            // will happen, e.g., when a nested opaque is inside of a non-
+            // existent associated type, like `impl Trait<Missing = impl Trait>`.
+            // See <tests/ui/impl-trait/stranded-opaque.rs>.
             let ty_err = ty_err.to_string(tcx);
-            tcx.dcx().span_bug(
+            let guar = tcx.dcx().span_delayed_bug(
                 span,
                 format!("could not unify `{hidden_ty}` with revealed type:\n{ty_err}"),
             );
+            return Err(guar);
         }
     }