## Function: COMMON-LISP:FUNCTION-LAMBDA-EXPRESSION
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> Return (VALUES DEFINING-LAMBDA-EXPRESSION CLOSURE-P NAME), where
> DEFINING-LAMBDA-EXPRESSION is NIL if unknown, or a suitable argument
> to COMPILE otherwise, CLOSURE-P is non-NIL if the function's definition
> might have been enclosed in some non-null lexical environment, and
> NAME is some name (for debugging only) or NIL if there is no name.

### Lambda list
```cl
(sb-impl::fun)
```