string to be written. the string should not be frozen.
* io.c (rb_io_sysread): ditto.
* lib/getoptlong.rb (GetoptLong::Error): provide a common ancestor
for GetoptLong error classes (RCR#129).
* re.c (rb_reg_copy_object): fixed memory leak.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@3126 b2dd03c8-39d4-4d8f-98ff-823fe69b080e