From 50f7d64f415aa2fa5767749e1076965308dfca05 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 19 Sep 2017 00:22:56 +0000
Subject: [PATCH] parse.y: lex by lvar

* parse.y (parse_ident): disable tLPAREN_ARG state by local
  variable.  [ruby-list:50578]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59957 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 parse.y                 |  2 +-
 test/ruby/test_parse.rb | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/parse.y b/parse.y
index 4f94b0eb81..15be84cc4e 100644
--- a/parse.y
+++ b/parse.y
@@ -8468,7 +8468,7 @@ parser_yylex(struct parser_params *parser)
 			"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");
+	    c = tLPAREN_ARG;
 	}
 	paren_nest++;
 	COND_PUSH(0);
diff --git a/test/ruby/test_parse.rb b/test/ruby/test_parse.rb
index f92bb49e05..36ff776db9 100644
--- a/test/ruby/test_parse.rb
+++ b/test/ruby/test_parse.rb
@@ -1054,6 +1054,17 @@ x = __ENCODING__
     assert_not_match(/unexpected tSTRING_END/, e)
   end
 
+  def test_lparenarg
+    o = Struct.new(:x).new
+    def o.i(x)
+      self.x = x
+    end
+    o.instance_eval {i (-1.3).abs}
+    assert_equal(1.3, o.x)
+    o.instance_eval {i = 0; i (-1.3).abs}
+    assert_equal(1.3, o.x)
+  end
+
 =begin
   def test_past_scope_variable
     assert_warning(/past scope/) {catch {|tag| eval("BEGIN{throw tag}; tap {a = 1}; a")}}