3.4 Using optimized constructs

3.4.2 Macro expansion

When an application of a macro, a compiler macro, or a function defined by usingdefsubst is processed at compilation time, the macro expansion or the in-line code for the function defined bydefsubst is substituted for the original form.

This substitution at compilation time produces the following restrictions:

Because only the macro expansion is invoked during execution, the macro call does not appear on the stack and cannot be traced.
When a file is compiled, the macro definition must precede the first use of the macro in text; otherwise, the Compiler treats the macro call as an ordinary function call, which causes a run-time error.
If a macro is redefined, any code using the macro definition must be recompiled.

The Advanced User's Guide - 9 SEP 1996

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