Auto merge of #21364 - cmr:fix-ttseq-ice, r=alexcrichton

Closes #21350

src/test/run-pass/issue-21350.rs

@@ -0,0 +1,17 @@
+// Copyright 2015 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.
+
+// Make sure that "bare sequences" don't ICE in follow checking
+
+macro_rules! bare {
+    $($id:expr),+ => ( $($id)+ )
+}
+
+fn main() { }