nobu	2017-01-19 10:38:59 +0900 (Thu, 19 Jan 2017)

  New Revision: 57367

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=57367

  Log:
    parse.y: warn space
    
    * parse.y (parser_yylex): warn parentheses after space.

  Modified files:
    trunk/parse.y
Index: parse.y
===================================================================
--- parse.y	(revision 57366)
+++ parse.y	(revision 57367)
@@ -8536,11 +8536,18 @@ parser_yylex(struct parser_params *parse https://github.com/ruby/ruby/blob/trunk/parse.y#L8536
 	}
 	else if (IS_SPCARG(-1)) {
 	    c = tLPAREN_ARG;
+	    if (lex_state == EXPR_ARG) {
+		rb_warning0("parentheses after method name and a space is interpreted as "
+			    "an argument list, not a parenthesed argument");
+	    }
 	}
 	else if (IS_lex_state(EXPR_ENDFN) && space_seen && !lambda_beginning_p()) {
 	    rb_warning0("parentheses after method name is interpreted as "
 			"an argument list, not a decomposed argument");
 	}
+	else if (lex_state == (EXPR_END|EXPR_LABEL) && space_seen) {
+	    rb_warning0("don't put space before argument parentheses");
+	}
 	paren_nest++;
 	COND_PUSH(0);
 	CMDARG_PUSH(0);

--
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