test: panic at map_unit_fn.rs:202 for map() without args

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/ui/map_unit_fn.rs b/tests/ui/map_unit_fn.rs
new file mode 100644
index 00000000000..1d203a147ba
--- /dev/null
+++ b/tests/ui/map_unit_fn.rs
@@ -0,0 +1,20 @@
+// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution.
+//
+// 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.
+
+#![allow(unused)]
+struct Mappable {}
+
+impl Mappable {
+    pub fn map(&self) {}
+}
+
+fn main() {
+    let m = Mappable {};
+    m.map();
+}