Add opt_alias_variances and use it in outlives code

2 files changed, 37 insertions, 0 deletions

diff --git a/tests/ui/impl-trait/precise-capturing/rpitit-outlives-2.rs b/tests/ui/impl-trait/precise-capturing/rpitit-outlives-2.rs
new file mode 100644
index 00000000000..6f7e1a0eaef
--- /dev/null
+++ b/tests/ui/impl-trait/precise-capturing/rpitit-outlives-2.rs
@@ -0,0 +1,19 @@
+//@ check-pass
+
+// Ensure that we skip uncaptured args from RPITITs when comptuing outlives.
+
+#![feature(precise_capturing_in_traits)]
+
+struct Invariant<T>(*mut T);
+
+trait Foo {
+    fn hello<'s: 's>(&'s self) -> Invariant<impl Sized + use<Self>>;
+}
+
+fn outlives_static(_: impl Sized + 'static) {}
+
+fn hello<'s, T: Foo + 'static>(x: &'s T) {
+    outlives_static(x.hello());
+}
+
+fn main() {}
diff --git a/tests/ui/impl-trait/precise-capturing/rpitit-outlives.rs b/tests/ui/impl-trait/precise-capturing/rpitit-outlives.rs
new file mode 100644
index 00000000000..94d81d766f7
--- /dev/null
+++ b/tests/ui/impl-trait/precise-capturing/rpitit-outlives.rs
@@ -0,0 +1,18 @@
+//@ check-pass
+
+// Ensure that we skip uncaptured args from RPITITs when collecting the regions
+// to enforce member constraints in opaque type inference.
+
+#![feature(precise_capturing_in_traits)]
+
+struct Invariant<T>(*mut T);
+
+trait Foo {
+    fn hello<'s: 's>(&'s self) -> Invariant<impl Sized + use<Self>>;
+}
+
+fn hello<'s, T: Foo>(x: &'s T) -> Invariant<impl Sized> {
+    x.hello()
+}
+
+fn main() {}