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Since ANSI requires BREAK to define to bind *DEBUGGER-HOOK* to NIL which would always place calls to BREAK in the native debugger, we define an additional hook *INVOKE-DEBUGGER-HOOK* which is called before *DEBUGGER-HOOK* so that one has the possiblity to install a customer debugger (such as the one provided in SLIME) to handle BREAK conditions. This convention is taken from SBCL.
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