1 files changed, 18 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-868.rs b/tests/ui/issues/issue-868.rs
new file mode 100644
index 00000000000..ce0a3c7ca52
--- /dev/null
+++ b/tests/ui/issues/issue-868.rs
@@ -0,0 +1,18 @@
+// run-pass
+#![allow(unused_parens)]
+// pretty-expanded FIXME #23616
+
+fn f<T, F>(g: F) -> T where F: FnOnce() -> T { g() }
+
+pub fn main() {
+  let _x = f( | | { 10 });
+    // used to be: cannot determine a type for this expression
+    f(| | { });
+    // ditto
+    f( | | { ()});
+    // always worked
+    let _: () = f(| | { });
+    // empty block with no type info should compile too
+    let _ = f(||{});
+    let _ = (||{});
+}