parse.y: fix labelarg

* parse.y (IS_BEG): include labeled argument state, which was
  EXPR_LABELARG.  [ruby-dev:49221] [Bug #11456]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51624 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Tue Aug 18 17:19:21 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* parse.y (IS_BEG): include labeled argument state, which was
+	  EXPR_LABELARG.  [ruby-dev:49221] [Bug #11456]
+
 Tue Aug 18 16:16:21 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* include/ruby/ruby.h (RClass): define only in C, `__attribute__`

parse.y

@@ -7108,7 +7108,7 @@ parser_prepare(struct parser_params *parser)
 
 #define IS_ARG() IS_lex_state(EXPR_ARG_ANY)
 #define IS_END() IS_lex_state(EXPR_END_ANY)
-#define IS_BEG() IS_lex_state(EXPR_BEG_ANY)
+#define IS_BEG() (IS_lex_state(EXPR_BEG_ANY) || IS_lex_state_all(EXPR_ARG|EXPR_LABELED))
 #define IS_SPCARG(c) (IS_ARG() && space_seen && !ISSPACE(c))
 #define IS_LABEL_POSSIBLE() (\
 	(IS_lex_state(EXPR_LABEL|EXPR_ENDFN) && !cmd_state) || \
@@ -8361,7 +8361,7 @@ parser_yylex(struct parser_params *parser)
 	return tSYMBEG;
 
       case '/':
-	if (IS_lex_state(EXPR_BEG_ANY)) {
+	if (IS_BEG()) {
 	    lex_strterm = NEW_STRTERM(str_regexp, '/', 0);
 	    return tREGEXP_BEG;
 	}

test/ruby/test_syntax.rb

@@ -310,6 +310,12 @@ WARN
     assert_valid_syntax("false ? raise do end : tap do end", bug10653)
   end
 
+  def test_paren_after_label
+    bug11456 = '[ruby-dev:49221] [Bug #11456]'
+    assert_valid_syntax("{foo: (1 rescue 0)}", bug11456)
+    assert_valid_syntax("{foo: /=/}", bug11456)
+  end
+
   def test_duplicated_arg
     assert_syntax_error("def foo(a, a) end", /duplicated argument name/)
     assert_nothing_raised { def foo(_, _) end }