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compiler choose the representation of closures.
(cconv--env-var): Remove.
* lisp/emacs-lisp/bytecomp.el (byte-compile--env-var): New var.
(byte-compile-make-closure, byte-compile-get-closed-var):
New functions.
* lisp/cedet/semantic/wisent/comp.el (wisent-byte-compile-grammar):
Macroexpand before passing to byte-compile-form.