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The debugger programmers interface is exported from from the
DEBUG-INTERNALS or DI package. This is a CMU
extension that allows debugging tools to be written without detailed
knowledge of the compiler or run-time system.
Some of the interface routines take a code-location as an argument. As described in the section on code-locations, some code-locations are unknown. When a function calls for a basic-code-location, it takes either type, but when it specifically names the argument code-location, the routine will signal an error if you give it an unknown code-location.