## Function: SB-INTROSPECT:FUNCTION-LAMBDA-LIST [![package](https://img.shields.io/badge/Package-SB--INTROSPECT-5f9ea0.svg?style=social&colorA=999999)](../) [![type](https://img.shields.io/badge/Type-Function-5f9ea0.svg?style=social&colorA=999999)](../#function) [![github](https://img.shields.io/badge/GitHub-View_the_source-5f9ea0.svg?style=social&colorA=999999&logo=github)](https://github.com/sbcl/sbcl/blob/master/contrib/sb-introspect/introspect.lisp/) > Describe the lambda list for the extended function designator FUNCTION. > Works for special-operators, macros, simple functions, interpreted functions, > and generic functions. Signals an error if FUNCTION is not a valid extended > function designator. ### Lambda list ```cl (function) ```