Ruby » Ruby master

string.c: clear substring code range

• string.c (str_substr): substring of broken code range string may
  be valid or broken. patch by tommy (Masahiro Tomita) at
  [ruby-dev:50430] [Bug #14388].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62040 b2dd03c8-39d4-4d8f-98ff-823fe69b080e