parse.y: allow parenthesed do-block in cmdarg

* parse.y (primary): flush cmdarg flags inside left-paren in a
  command argument, to allow parenthesed do-block as an argument
  without arguments parentheses.  [ruby-core:61950] [Bug #9726]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45637 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 3 deletions

diff --git a/parse.y b/parse.y
index 5b90bd2909..726f89130b 100644
--- a/parse.y
+++ b/parse.y
@@ -2620,12 +2620,18 @@ primary		: literal
 			$$ = dispatch1(paren, 0);
 		    %*/
 		    }
-		| tLPAREN_ARG expr {lex_state = EXPR_ENDARG;} rparen
+		| tLPAREN_ARG
 		    {
+			$<val>1 = cmdarg_stack;
+			cmdarg_stack = 0;
+		    }
+		  expr {lex_state = EXPR_ENDARG;} rparen
+		    {
+			cmdarg_stack = $<val>1;
 		    /*%%%*/
-			$$ = $2;
+			$$ = $3;
 		    /*%
-			$$ = dispatch1(paren, $2);
+			$$ = dispatch1(paren, $3);
 		    %*/
 		    }
 		| tLPAREN compstmt ')'