1 files changed, 39 insertions, 0 deletions
diff --git a/tests/ui/block-result/blocks-without-results-11709.rs b/tests/ui/block-result/blocks-without-results-11709.rs
new file mode 100644
index 00000000000..97ea6f9e19e
--- /dev/null
+++ b/tests/ui/block-result/blocks-without-results-11709.rs
@@ -0,0 +1,39 @@
+//! Regression test for https://github.com/rust-lang/rust/issues/11709
+
+//@ run-pass
+#![allow(dead_code)]
+
+// Don't panic on blocks without results
+// There are several tests in this run-pass that raised
+// when this bug was opened. The cases where the compiler
+// panics before the fix have a comment.
+
+struct S {x:()}
+
+fn test(slot: &mut Option<Box<dyn FnMut() -> Box<dyn FnMut()>>>) -> () {
+  let a = slot.take();
+  let _a: () = match a {
+    // `{let .. a(); }` would break
+    Some(mut a) => { let _a = a(); },
+    None => (),
+  };
+}
+
+fn not(b: bool) -> bool {
+    if b {
+        !b
+    } else {
+        // `panic!(...)` would break
+        panic!("Break the compiler");
+    }
+}
+
+pub fn main() {
+    // {} would break
+    let _r: () = {};
+    let mut slot = None;
+    // `{ test(...); }` would break
+    let _s : S  = S{ x: { test(&mut slot); } };
+
+    let _b = not(true);
+}