## Generic-function: SB-GRAY:STREAM-UNREAD-CHAR
[![package](https://img.shields.io/badge/Package-SB--GRAY-5f9ea0.svg?style=social&colorA=999999)](../) [![type](https://img.shields.io/badge/Type-Generic--Function-5f9ea0.svg?style=social&colorA=999999)](../#generic-function) 

> Undo the last call to STREAM-READ-CHAR, as in UNREAD-CHAR.
> Return NIL. Every subclass of FUNDAMENTAL-CHARACTER-INPUT-STREAM
> must define a method for this function.

### Lambda list
```cl
(stream character)
```