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

ext/date/lib/date.rb

@@ -15,17 +15,17 @@ class Date
 
     protected :d
 
-    def zero? () false end
-    def finite? () false end
-    def infinite? () d.nonzero? end
-    def nan? () d.zero? end
+    def zero?() false end
+    def finite?() false end
+    def infinite?() d.nonzero? end
+    def nan?() d.zero? end
 
     def abs() self.class.new end
 
-    def -@ () self.class.new(-d) end
-    def +@ () self.class.new(+d) end
+    def -@() self.class.new(-d) end
+    def +@() self.class.new(+d) end
 
-    def <=> (other)
+    def <=>(other)
       case other
       when Infinity; return d <=> other.d
       when Numeric; return d

ext/openssl/lib/openssl/buffering.rb

@@ -381,7 +381,7 @@ module OpenSSL::Buffering
   # Writes +s+ to the stream.  +s+ will be converted to a String using
   # String#to_s.
 
-  def << (s)
+  def <<(s)
     do_write(s)
     self
   end

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);