Add a test for Weak::new() not crashing for uninhabited types

diff --git a/src/test/run-pass/weak-new-uninhabited-issue-48493.rs b/src/test/run-pass/weak-new-uninhabited-issue-48493.rs
new file mode 100644 (file)
index 0000000..eb57c12
--- /dev/null
+++ b/src/test/run-pass/weak-new-uninhabited-issue-48493.rs
@@ -0,0 +1,15 @@
+// Copyright 2018 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.
+
+fn main() {
+    enum Void {}
+    std::rc::Weak::<Void>::new();
+    std::sync::Weak::<Void>::new();
+}