From 65e27c8b138d6959608658ffce2fa761842b8d24 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 29 Nov 2016 10:47:43 +0000
Subject: [PATCH] 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                 | 14 +++++++-------
 ext/openssl/lib/openssl/buffering.rb |  2 +-
 parse.y                              |  4 ++++
 3 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/ext/date/lib/date.rb b/ext/date/lib/date.rb
index 48ce6316bd..c10441e573 100644
--- a/ext/date/lib/date.rb
+++ b/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
diff --git a/ext/openssl/lib/openssl/buffering.rb b/ext/openssl/lib/openssl/buffering.rb
index 61e1f43e00..94aba3520b 100644
--- a/ext/openssl/lib/openssl/buffering.rb
+++ b/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
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);