Rollup merge of #91239 - cameron1024:issue-87490-regression, r=jackh726

regression test for issue 87490

Closes #87490

2 files changed, 24 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-87490.rs b/src/test/ui/issues/issue-87490.rs
new file mode 100644
index 00000000000..998f61a6bd3
--- /dev/null
+++ b/src/test/ui/issues/issue-87490.rs
@@ -0,0 +1,10 @@
+fn main() {}
+trait StreamOnce {
+    type Position;
+}
+impl StreamOnce for &str {
+    type Position = usize;
+}
+fn follow(_: &str) -> <&str as StreamOnce>::Position {
+    String::new  //~ ERROR mismatched types
+}
diff --git a/src/test/ui/issues/issue-87490.stderr b/src/test/ui/issues/issue-87490.stderr
new file mode 100644
index 00000000000..f359dd638ad
--- /dev/null
+++ b/src/test/ui/issues/issue-87490.stderr
@@ -0,0 +1,14 @@
+error[E0308]: mismatched types
+  --> $DIR/issue-87490.rs:9:5
+   |
+LL | fn follow(_: &str) -> <&str as StreamOnce>::Position {
+   |                       ------------------------------ expected `usize` because of return type
+LL |     String::new
+   |     ^^^^^^^^^^^ expected `usize`, found fn item
+   |
+   = note: expected type `usize`
+           found fn item `fn() -> String {String::new}`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0308`.