parse.y: warn past scope variable

* parse.y (gettable_gen): warn possible reference to a local
  variable defined in a past scope.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48986 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 0 deletions

diff --git a/test/ruby/test_parse.rb b/test/ruby/test_parse.rb
index 70b38a2a7e..38dca83053 100644
--- a/test/ruby/test_parse.rb
+++ b/test/ruby/test_parse.rb
@@ -873,4 +873,8 @@ x = __ENCODING__
     a = "\u{3042}"
     assert_warning(/#{a}/) {eval("#{a} = 1; /(?<#{a}>)/ =~ ''")}
   end
+
+  def test_past_scope_variable
+    assert_warning(/past scope/) {catch {|tag| eval("BEGIN{throw tag}; tap {a = 1}; a")}}
+  end
 end