If a function has rb_warning() that is not a leaf because warning
ultimately is a method call of Warning#warn.
If a function has rb_name_error() that is not a leaf because
NameError is allocated, then initialized. This of course
involves calling NameError#initialize.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66976 b2dd03c8-39d4-4d8f-98ff-823fe69b080e