Auto merge of #146727 - matthiaskrgr:rollup-98812uj, r=matthiaskrgr

Rollup of 6 pull requests

Successful merges:

 - rust-lang/rust#146434 (c-variadic: allow c-variadic inherent and trait methods)
 - rust-lang/rust#146487 (Improve `core::num` coverage)
 - rust-lang/rust#146597 (Add span for struct tail recursion limit error)
 - rust-lang/rust#146622 (Add regression test for issue rust-lang/rust#91831)
 - rust-lang/rust#146717 (Clean up universe evaluation during type test evaluation)
 - rust-lang/rust#146723 (Include patch in release notes)

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

compiler/rustc_trait_selection/src/traits/dyn_compatibility.rs

@@ -426,6 +426,9 @@ fn virtual_call_violations_for_method<'tcx>(
     if let Some(code) = contains_illegal_impl_trait_in_trait(tcx, method.def_id, sig.output()) {
         errors.push(code);
     }
+    if sig.skip_binder().c_variadic {
+        errors.push(MethodViolationCode::CVariadic);
+    }
 
     // We can't monomorphize things like `fn foo<A>(...)`.
     let own_counts = tcx.generics_of(method.def_id).own_counts();

compiler/rustc_trait_selection/src/traits/project.rs

@@ -1057,6 +1057,7 @@ fn assemble_candidates_from_impls<'cx, 'tcx>(
                     Some(LangItem::PointeeTrait) => {
                         let tail = selcx.tcx().struct_tail_raw(
                             self_ty,
+                            &obligation.cause,
                             |ty| {
                                 // We throw away any obligations we get from this, since we normalize
                                 // and confirm these obligations once again during confirmation