3.6 Debugging compiled code

3.6.2 Special variables

While the effect of aspecial declaration is exactly the same in the Compiler and the interpreter, compiled access to special variables occurs through in-line coding of the Common Lisp function symbol-value. An unbound special variable can cause obscure errors. To check special variables, you can either declare thesymbol-value function asnotinline or compile code with the safety optimization level set to 3.

The Advanced User's Guide - 9 SEP 1996

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