* parse.y (primary): allow an empty grouped expression as the

  operand of the not operator (e.g., not ()).
  [ruby-core:45976] [Bug #6674]

* parse.y (parser_yylex): show no warning for a grouped expression
  as the operand of the not operator (e.g., not (a)) or as an
  argument of a method call without parentheses (e.g., foo (a)).
  [ruby-core:39050] [Bug #5214]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36434 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 1 deletions

diff --git a/parse.y b/parse.y
index 0853d1e790..91d732f446 100644
--- a/parse.y
+++ b/parse.y
@@ -2710,6 +2710,14 @@ primary		: literal
 			$$ = dispatch1(begin, $3);
 		    %*/
 		    }
+		| tLPAREN_ARG {lex_state = EXPR_ENDARG;} rparen
+		    {
+		    /*%%%*/
+			$$ = 0;
+		    /*%
+			$$ = dispatch1(paren, 0);
+		    %*/
+		    }
 		| tLPAREN_ARG expr {lex_state = EXPR_ENDARG;} rparen
 		    {
 		    /*%%%*/
@@ -7671,7 +7679,6 @@ parser_yylex(struct parser_params *parser)
 	}
 	else if (IS_SPCARG(-1)) {
 	    c = tLPAREN_ARG;
-	    rb_warning0("(...) interpreted as grouped expression");
 	}
 	paren_nest++;
 	COND_PUSH(0);