1 files changed, 7 insertions, 0 deletions
diff --git a/tests/ui/traits/next-solver/closure-substs-ambiguity.rs b/tests/ui/traits/next-solver/closure-substs-ambiguity.rs
new file mode 100644
index 000000000..cc9ee58f2
--- /dev/null
+++ b/tests/ui/traits/next-solver/closure-substs-ambiguity.rs
@@ -0,0 +1,7 @@
+// compile-flags: -Znext-solver
+// check-pass
+
+fn main() {
+    let mut x: Vec<_> = vec![];
+    x.extend(Some(1i32).into_iter().map(|x| x));
+}