rb_find_file_noext().

* file.c (rb_find_file_noext): move rb_file_s_expand_path to
  rb_f_require().

* string.c (rb_str_each_line): should propagate taint mark.

* ext/nkf/nkf.c (rb_nkf_kconv): ditto.

* ruby.c (load_file): local variables 'c' remain uninitialized on
  xflag.

* regex.c (re_match): prefetched escaped character too early.

* eval.c (rb_call0): add argument check for attr_readers.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_6@1574 b2dd03c8-39d4-4d8f-98ff-823fe69b080e