Auto merge of #98914 - fee1-dead-contrib:min-deref-patterns, r=compiler-errors

Minimal implementation of implicit deref patterns for Strings

cc `@compiler-errors` `@BoxyUwU` https://github.com/rust-lang/lang-team/issues/88 #87121

~~I forgot to add a feature gate, will do so in a minute~~ Done

compiler/rustc_lint/src/non_fmt_panic.rs

@@ -148,7 +148,7 @@ fn check_panic<'tcx>(cx: &LateContext<'tcx>, f: &'tcx hir::Expr<'tcx>, arg: &'tc
                 ty::Ref(_, r, _) if *r.kind() == ty::Str,
             ) || matches!(
                 ty.ty_adt_def(),
-                Some(ty_def) if cx.tcx.is_diagnostic_item(sym::String, ty_def.did()),
+                Some(ty_def) if Some(ty_def.did()) == cx.tcx.lang_items().string(),
             );
 
             let infcx = cx.tcx.infer_ctxt().build();