parse.y: warn circular argument reference

* parse.y (gettable_gen): warn circular argument reference, for
  transition from 2.1 and earlier.  [ruby-core:65990] [Bug #10314]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48188 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 12 insertions, 4 deletions

diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
index 797d559b02..2da7797b47 100644
--- a/test/ruby/test_syntax.rb
+++ b/test/ruby/test_syntax.rb
@@ -140,24 +140,32 @@ class TestSyntax < Test::Unit::TestCase
   def test_keyword_self_reference
     bug9593 = '[ruby-core:61299] [Bug #9593]'
     o = Object.new
-    def o.foo(var: defined?(var)) var end
+    assert_warn(/circular argument reference - var/) do
+      o.instance_eval("def foo(var: defined?(var)) var end")
+    end
     assert_equal(42, o.foo(var: 42))
     assert_equal("local-variable", o.foo, bug9593)
 
     o = Object.new
-    def o.foo(var: var) var end
+    assert_warn(/circular argument reference - var/) do
+      o.instance_eval("def foo(var: var) var end")
+    end
     assert_nil(o.foo, bug9593)
   end
 
   def test_optional_self_reference
     bug9593 = '[ruby-core:61299] [Bug #9593]'
     o = Object.new
-    def o.foo(var = defined?(var)) var end
+    assert_warn(/circular argument reference - var/) do
+      o.instance_eval("def foo(var = defined?(var)) var end")
+    end
     assert_equal(42, o.foo(42))
     assert_equal("local-variable", o.foo, bug9593)
 
     o = Object.new
-    def o.foo(var = var) var end
+    assert_warn(/circular argument reference - var/) do
+      o.instance_eval("def foo(var = var) var end")
+    end
     assert_nil(o.foo, bug9593)
   end