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-rw-r--r--ext/pty/lib/expect.rb2
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