Switch to `Ignore` output mode for () blocks

Closes #11709
Closes #11865

1 files changed, 47 insertions, 0 deletions

diff --git a/src/test/run-pass/issue-11709.rs b/src/test/run-pass/issue-11709.rs
new file mode 100644
index 00000000000..6bddfd7d1a9
--- /dev/null
+++ b/src/test/run-pass/issue-11709.rs
@@ -0,0 +1,47 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// xfail-pretty
+
+// Don't fail on blocks without results
+// There are several tests in this run-pass that raised
+// when this bug was oppened. The cases where the compiler
+// failed before the fix have a comment.
+
+struct S {x:()}
+
+
+fn test(slot: &mut Option<proc() -> proc()>, _: proc()) -> () {
+  let a = slot.take();
+  let _a = match a {
+    // `{let .. a(); }` would break
+    Some(a) => { let _a = a(); },
+    None => (),
+  };
+}
+
+fn not(b: bool) -> bool {
+    if b {
+        !b
+    } else {
+        // `fail!(...)` would break
+        fail!("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, proc() {}); } };
+
+    let _b = not(true);
+}