Check the IO is open before polling.

Author: aardvark179

lib/truffle/io/wait.rb

@@ -17,12 +17,14 @@ def ready?
   end
 
   def wait(timeout = nil)
+    ensure_open_and_readable
     Truffle::IOOperations.poll(self, Truffle::IOOperations::POLLIN, timeout) > 0 ? self : nil
   end
 
   alias_method :wait_readable, :wait
 
   def wait_writable(timeout = nil)
+    ensure_open_and_writable
     Truffle::IOOperations.poll(self, Truffle::IOOperations::POLLOUT, timeout) > 0 ? self : nil
   end
 end