Promote crashes tests to ui.

Author: cjgillot

tests/crashes/125249.rs

@@ -1,4 +1,5 @@
-//@ known-bug: rust-lang/rust#126850
+//@ check-pass
+
 fn bug<T>() -> impl Iterator<
     Item = [(); {
                |found: &String| Some(false);

tests/crashes/126850.rs renamed to tests/ui/impl-trait/closure-in-type.rs

@@ -0,0 +1,9 @@
+#![allow(incomplete_features)]
+#![feature(return_type_notation)]
+
+trait IntFactory {
+    fn stream(&self) -> impl IntFactory<stream(..): IntFactory<stream(..): Send> + Send>;
+    //~^ ERROR cycle detected when resolving lifetimes for `IntFactory::stream`
+}
+
+pub fn main() {}

tests/ui/impl-trait/in-trait/return-type-notation.rs

@@ -0,0 +1,27 @@
+error[E0391]: cycle detected when resolving lifetimes for `IntFactory::stream`
+  --> $DIR/return-type-notation.rs:5:5
+   |
+LL |     fn stream(&self) -> impl IntFactory<stream(..): IntFactory<stream(..): Send> + Send>;
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+note: ...which requires computing function signature of `IntFactory::stream`...
+  --> $DIR/return-type-notation.rs:5:5
+   |
+LL |     fn stream(&self) -> impl IntFactory<stream(..): IntFactory<stream(..): Send> + Send>;
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+note: ...which requires looking up late bound vars inside `IntFactory::stream`...
+  --> $DIR/return-type-notation.rs:5:5
+   |
+LL |     fn stream(&self) -> impl IntFactory<stream(..): IntFactory<stream(..): Send> + Send>;
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   = note: ...which again requires resolving lifetimes for `IntFactory::stream`, completing the cycle
+note: cycle used when listing captured lifetimes for opaque `IntFactory::stream::{opaque#0}`
+  --> $DIR/return-type-notation.rs:5:25
+   |
+LL |     fn stream(&self) -> impl IntFactory<stream(..): IntFactory<stream(..): Send> + Send>;
+   |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0391`.