## Macro: SB-INT:DEFINE-FUNCTION-NAME-SYNTAX
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> Define function names of the form of a list headed by SYMBOL to be
> a legal function name, subject to restrictions imposed by BODY.  BODY
> is evaluated with VAR bound to the form required to check, and should
> return two values: the first value is a generalized boolean indicating
> legality, and the second a symbol for use as a BLOCK name or similar
> situations.

### Lambda list
```cl
(symbol (sb-debug:var) &body sb-impl::body)
```