1 files changed, 15 insertions, 0 deletions
diff --git a/src/test/ui/inference/question-mark-type-infer.rs b/src/test/ui/inference/question-mark-type-infer.rs
new file mode 100644
index 000000000..64333a293
--- /dev/null
+++ b/src/test/ui/inference/question-mark-type-infer.rs
@@ -0,0 +1,15 @@
+// Test that type inference fails where there are multiple possible return types
+// for the `?` operator.
+
+fn f(x: &i32) -> Result<i32, ()> {
+    Ok(*x)
+}
+
+fn g() -> Result<Vec<i32>, ()> {
+    let l = [1, 2, 3, 4];
+    l.iter().map(f).collect()? //~ ERROR type annotations needed
+}
+
+fn main() {
+    g();
+}