Overriding cl package symbols

[James Gunn]

Hello,

I have been reading the source code for parenscript and I am keen to find
out how you override locked symbols? In the parenscript package there are
exports such as "#:defun". I have tried myself to create my own package
that exports defun but i get the following error message(using SBCL)

"Lock on package COMMON-LISP violated when proclaiming DEFUN as a function"

I'd be very interested in finding out how you got around this.

Thank you,

James Gunn
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