Revert "m1!{...} is now forbidden. Use m1!(...) instead."

This reverts commit 89bbaff.

Author: graydon

src/libsyntax/parse/parser.rs

@@ -1082,10 +1082,15 @@ impl Parser {
             /* `!`, as an operator, is prefix, so we know this isn't that */
             if self.token == token::NOT {
                 self.bump();
-                let tts = self.parse_unspanned_seq(
-                    token::LPAREN, token::RPAREN, seq_sep_none(),
-                    |p| p.parse_token_tree());
-
+                let tts = match self.token {
+                  token::LPAREN | token::LBRACE | token::LBRACKET => {
+                    let ket = token::flip_delimiter(self.token);
+                    self.parse_unspanned_seq(copy self.token, ket,
+                                             seq_sep_none(),
+                                             |p| p.parse_token_tree())
+                  }
+                  _ => self.fatal(~"expected open delimiter")
+                };
                 let hi = self.span.hi;
 
                 return self.mk_mac_expr(
@@ -3412,9 +3417,15 @@ impl Parser {
             let pth = self.parse_path_without_tps();
             self.expect(token::NOT);
             let id = self.parse_ident();
-            let tts = self.parse_unspanned_seq(
-                token::LPAREN, token::RPAREN, seq_sep_none(),
-                |p| p.parse_token_tree());
+            let tts = match self.token {
+              token::LPAREN | token::LBRACE | token::LBRACKET => {
+                let ket = token::flip_delimiter(self.token);
+                self.parse_unspanned_seq(copy self.token, ket,
+                                         seq_sep_none(),
+                                         |p| p.parse_token_tree())
+              }
+              _ => self.fatal(~"expected open delimiter")
+            };
             let m = ast::mac_invoc_tt(pth, tts);
             let m: ast::mac = {node: m,
                                span: {lo: self.span.lo,