parse.y: ambiguous parentheses

* parse.y (parser_yylex): warn ambiguous parentheses after a space
  in method definitions.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56927 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 0 deletions

diff --git a/parse.y b/parse.y
index d532954d10..0f3eac1e56 100644
--- a/parse.y
+++ b/parse.y
@@ -8520,6 +8520,10 @@ parser_yylex(struct parser_params *parser)
 	else if (IS_SPCARG(-1)) {
 	    c = tLPAREN_ARG;
 	}
+	else if (IS_lex_state(EXPR_ENDFN) && space_seen) {
+	    rb_warning0("parentheses after method name is interpreted as");
+	    rb_warning0("an argument list, not a decomposed argument");
+	}
 	paren_nest++;
 	COND_PUSH(0);
 	CMDARG_PUSH(0);