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From: Joel Reymont <joelr1@gmail.com>
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Date: Fri, 18 Mar 2011 15:45:52 +0100
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Subject: [Caml-list] Re: errors compiling thrift-generated code

Changing the copy method to this 

  method copy =
    let _new = (Oo.copy self:> #document) in
   _new

or this:

  method copy : document =
    let _new = Oo.copy self in
   _new

gives the error at the very bottom of the gist [1], i.e. "Self type cannot escape its class"

	Thanks, Joel

[1] https://gist.github.com/876154

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