Add test

src/test/pretty/issue-19077.rs

@@ -0,0 +1,20 @@
+// Copyright 2012 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.
+//
+// Testing that unsafe blocks in match arms are followed by a comma
+// pp-exact
+fn main() {
+    match true {
+        true if true => (),
+        false => unsafe { },
+        true => { }
+        false => (),
+    }
+}