Auto merge of #31254 - tmiasko:macro-pretty-print-fix, r=sfackler

Pretty printing of macro with braces but without terminated semicolon
removed more boxes from stack than it put there, resulting in panic.
This fixes the issue #30731.

1 files changed, 2 insertions, 5 deletions

diff --git a/src/libsyntax/print/pprust.rs b/src/libsyntax/print/pprust.rs
index e80297eb797..759b16c5738 100644
--- a/src/libsyntax/print/pprust.rs
+++ b/src/libsyntax/print/pprust.rs
@@ -1781,11 +1781,8 @@ impl<'a> State<'a> {
             token::Paren => try!(self.popen()),
             token::Bracket => try!(word(&mut self.s, "[")),
             token::Brace => {
-                // head-ibox, will be closed by bopen()
-                try!(self.ibox(0));
-                // Don't ask me why the regular bopen() does
-                // more then just opening a brace...
-                try!(self.bopen())
+                try!(self.head(""));
+                try!(self.bopen());
             }
         }
         try!(self.print_tts(&m.node.tts));