Rely on drop to emit unclosed delims

Author: estebank

src/libsyntax/parse/parser.rs

@@ -784,7 +784,6 @@ impl<'a> Parser<'a> {
             // leave it in the input
             Ok(false)
         } else if self.last_unexpected_token_span == Some(self.span) {
-            emit_unclosed_delims(&self.unclosed_delims, self.diagnostic());
             FatalError.raise();
         } else {
             let mut expected = edible.iter()