Detect confusing unicode characters and show the alternative

1 files changed, 18 insertions, 0 deletions

diff --git a/src/test/parse-fail/unicode-chars.rs b/src/test/parse-fail/unicode-chars.rs
new file mode 100644
index 00000000000..adfaf62b5d3
--- /dev/null
+++ b/src/test/parse-fail/unicode-chars.rs
@@ -0,0 +1,18 @@
+// 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.
+
+// compile-flags: -Z parse-only
+// ignore-tidy-linelength
+
+fn main() {
+    let y = 0;
+    //~^ ERROR unknown start of token: \u{37e}
+    //~^^ HELP unicode character ';' (Greek Question Mark) looks much like ';' (Semicolon), but it's not
+}