Auto merge of #107038 - compiler-errors:dont-wfcheck-non-local-rpit, r=oli-obk

Don't wf-check non-local RPITs

We were using `ty::is_impl_trait_defn(..).is_none()` to check if we need to add WF obligations for an opaque type.

This is *supposed* to be checking if the type is a TAIT, since RPITs' wfness is implied by wf checking its parent item, but since `is_impl_trait_defn` returns `None` for non-local RPIT and async futures, we unnecessarily consider wf predicates for an RPIT if it is coming from a foreign crate.

Fixes #107036

r? `@oli-obk` but feel free to reassign

compiler/rustc_middle/src/query/mod.rs

@@ -177,6 +177,12 @@ rustc_queries! {
         separate_provide_extern
     }
 
+    query is_type_alias_impl_trait(key: DefId) -> bool
+    {
+        desc { "determine whether the opaque is a type-alias impl trait" }
+        separate_provide_extern
+    }
+
     query analysis(key: ()) -> Result<(), ErrorGuaranteed> {
         eval_always
         desc { "running analysis passes on this crate" }

compiler/rustc_middle/src/ty/parameterized.rs

@@ -52,6 +52,7 @@ trivially_parameterized_over_tcx! {
     usize,
     (),
     u32,
+    bool,
     std::string::String,
     crate::metadata::ModChild,
     crate::middle::codegen_fn_attrs::CodegenFnAttrs,