* ext/pty/lib/expect.rb: raise an error when argument is unexpected

  type.  based on a patch from Luiz Angelo Daros de Luca in
  [ruby-core:23464].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27276 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 0 deletions

diff --git a/ext/pty/lib/expect.rb b/ext/pty/lib/expect.rb
index 50d2fbd363..52396d90bd 100644
--- a/ext/pty/lib/expect.rb
+++ b/ext/pty/lib/expect.rb
@@ -14,6 +14,8 @@ class IO
       e_pat = Regexp.new(Regexp.quote(pat))
     when Regexp
       e_pat = pat
+    else
+      raise TypeError, "unsupported pattern class: #{pattern.class}"
     end
     while true
       if !IO.select([self],nil,nil,timeout) or eof? then