Tests, suppress refine lint when errors

compiler/rustc_hir_analysis/src/check/compare_impl_item/refine.rs

@@ -5,7 +5,8 @@ use rustc_infer::infer::{outlives::env::OutlivesEnvironment, TyCtxtInferExt};
 use rustc_lint_defs::builtin::{REFINING_IMPL_TRAIT_INTERNAL, REFINING_IMPL_TRAIT_REACHABLE};
 use rustc_middle::traits::{ObligationCause, Reveal};
 use rustc_middle::ty::{
-    self, Ty, TyCtxt, TypeFoldable, TypeFolder, TypeSuperVisitable, TypeVisitable, TypeVisitor,
+    self, Ty, TyCtxt, TypeFoldable, TypeFolder, TypeSuperVisitable, TypeVisitable,
+    TypeVisitableExt, TypeVisitor,
 };
 use rustc_span::Span;
 use rustc_trait_selection::regions::InferCtxtRegionExt;
@@ -62,6 +63,10 @@ pub(super) fn check_refining_return_position_impl_trait_in_trait<'tcx>(
         return;
     };
 
+    if hidden_tys.items().any(|(_, &ty)| ty.skip_binder().references_error()) {
+        return;
+    }
+
     let mut collector = ImplTraitInTraitCollector { tcx, types: FxIndexSet::default() };
     trait_m_sig.visit_with(&mut collector);
 

tests/ui/impl-trait/precise-capturing/rpitit-impl-captures-too-much.rs

@@ -0,0 +1,15 @@
+#![feature(precise_capturing)]
+//~^ WARN the feature `precise_capturing` is incomplete
+
+struct Invariant<'a>(&'a mut &'a mut ());
+
+trait Trait {
+    fn hello(self_: Invariant<'_>) -> impl use<Self> Sized;
+}
+
+impl Trait for () {
+    fn hello(self_: Invariant<'_>) -> impl use<'_> Sized {}
+    //~^ return type captures more lifetimes than trait definition
+}
+
+fn main() {}

tests/ui/impl-trait/precise-capturing/rpitit-impl-captures-too-much.stderr

@@ -0,0 +1,26 @@
+warning: the feature `precise_capturing` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/rpitit-impl-captures-too-much.rs:1:12
+   |
+LL | #![feature(precise_capturing)]
+   |            ^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #123432 <https://github.com/rust-lang/rust/issues/123432> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+error: return type captures more lifetimes than trait definition
+  --> $DIR/rpitit-impl-captures-too-much.rs:11:39
+   |
+LL |     fn hello(self_: Invariant<'_>) -> impl use<'_> Sized {}
+   |                               --      ^^^^^^^^^^^^^^^^^^
+   |                               |
+   |                               this lifetime was captured
+   |
+note: hidden type must only reference lifetimes captured by this impl trait
+  --> $DIR/rpitit-impl-captures-too-much.rs:7:39
+   |
+LL |     fn hello(self_: Invariant<'_>) -> impl use<Self> Sized;
+   |                                       ^^^^^^^^^^^^^^^^^^^^
+   = note: hidden type inferred to be `impl Sized`
+
+error: aborting due to 1 previous error; 1 warning emitted
+

tests/ui/impl-trait/precise-capturing/rpitit.rs

@@ -0,0 +1,17 @@
+//@ check-pass
+
+#![feature(precise_capturing)]
+//~^ WARN the feature `precise_capturing` is incomplete
+
+struct Invariant<'a>(&'a mut &'a mut ());
+
+trait Trait {
+    fn hello(self_: Invariant<'_>) -> impl use<Self> Sized;
+}
+
+fn eq<'a, 'b, T: Trait>(x: Invariant<'a>, y: Invariant<'b>) {
+    let mut out = T::hello(x);
+    out = T::hello(y);
+}
+
+fn main() {}

tests/ui/impl-trait/precise-capturing/rpitit.stderr

@@ -0,0 +1,11 @@
+warning: the feature `precise_capturing` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/rpitit.rs:3:12
+   |
+LL | #![feature(precise_capturing)]
+   |            ^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #123432 <https://github.com/rust-lang/rust/issues/123432> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+warning: 1 warning emitted
+