* ext/objspace/object_tracing.c: Document object_tracing methods.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41385 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_symbol.rb: fix test

* test/ruby/test_symbol.rb (test_block_persist_between_calls): needs
  receiver object.  [Bug #8531]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41386 b2dd03c8-39d4-4d8f-98ff-823fe69b080e