scoped constant op-assignment

* test/ripper/test_parser_events.rb (test_opassign): allow scoped
  constant op-assignment.  [ruby-core:40154] [Bug #5449]

* test/ripper/test_parser_events.rb (test_opassign_error): backref
  opassign is only error.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38587 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ripper/test_parser_events.rb

@@ -699,12 +699,15 @@ class TestRipper::ParserEvents < Test::Unit::TestCase
     thru_opassign = false
     parse('a ||= b', :on_opassign) {thru_opassign = true}
     assert_equal true, thru_opassign
+    thru_opassign = false
+    parse('a::X ||= c 1', :on_opassign) {thru_opassign = true}
+    assert_equal true, thru_opassign
   end
 
   def test_opassign_error
     thru_opassign = []
     events = [:on_opassign]
-    parse('a::X ||= c 1', events) {|a,*b|
+    parse('$~ ||= 1', events) {|a,*b|
       thru_opassign << a
     }
     assert_equal events, thru_opassign