ruby.c: do not modify shared string

* ruby.c (ruby_init_loadpath_safe): get rid of modify shared
  string directly.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48742 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-12-09

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48743 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
thread.c: get rid of invalid ID symbol

* eval.c (rb_frame_last_func): return the most recent frame method
  name.
* thread.c (recursive_list_access): use the last method name,
  instead of the current method name which can be unset in some
  cases, not to use a symbol by the invalid ID.
  [ruby-core:66742] [Bug #10579]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48744 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
vm_eval.c: fix `rb_eval_string_wrap` rdoc

* vm_eval.c (rb_eval_string_wrap): [DOC] Fix `rb_eval_string_wrap`
  documentation.  It is referencing `require` instead of `load`.
  The former does not have the optional argument.  [Fix GH-779]
  [ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48745 b2dd03c8-39d4-4d8f-98ff-823fe69b080e