symbol.c: fix dynamic attrset ID

* symbol.c (rb_str_dynamic_intern): check if the stem ID of
  attrset ID is already registered as a static ID.
  [ruby-dev:48559] [Bug #10259]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47643 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 0 deletions

diff --git a/test/ruby/test_symbol.rb b/test/ruby/test_symbol.rb
index 30ed26272f..a25e6fb5d2 100644
--- a/test/ruby/test_symbol.rb
+++ b/test/ruby/test_symbol.rb
@@ -222,4 +222,12 @@ class TestSymbol < Test::Unit::TestCase
                        '',
                        child_env: '--disable-gems')
   end
+
+  def test_dynamic_attrset_id
+    bug10259 = '[ruby-dev:48559] [Bug #10259]'
+    class << (obj = Object.new)
+      attr_writer :unagi
+    end
+    assert_nothing_raised(NoMethodError, bug10259) {obj.send("unagi=".intern, 1)}
+  end
 end