Test format hygiene

diff --git a/src/test/run-pass/format-hygiene.rs b/src/test/run-pass/format-hygiene.rs
new file mode 100644 (file)
index 0000000..6971f77
--- /dev/null
+++ b/src/test/run-pass/format-hygiene.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.
+
+pub const arg0: u8 = 1;
+
+pub fn main() {
+    format!("{}", 1);
+}