## Function: COMMON-LISP:UPGRADED-ARRAY-ELEMENT-TYPE
[![package](https://img.shields.io/badge/Package-COMMON--LISP-5f9ea0.svg?style=social&colorA=999999)](../) [![type](https://img.shields.io/badge/Type-Function-5f9ea0.svg?style=social&colorA=999999)](../#function) [![clhs](https://img.shields.io/badge/CLHS-UPGRADED--ARRAY--ELEMENT--TYPE-5f9ea0.svg?style=social&colorA=999999)](http://www.lispworks.com/documentation/HyperSpec/Body/f_upgr_1.htm) [![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/src/compiler/generic/vm-type.lisp/) 

> Return the element type that will actually be used to implement an array
> with the specifier :ELEMENT-TYPE Spec.

### Lambda list
```cl
(sb-kernel::spec &optional sb-kernel::environment)
```