## Generic-function: SB-SEQUENCE:CONCATENATE
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> Implements CL:CONCATENATE for extended sequences.
> 
> RESULT-PROTOTYPE corresponds to the RESULT-TYPE of CL:CONCATENATE
> but receives a prototype instance of an extended sequence class
> instead of a type specifier. By dispatching on RESULT-PROTOTYPE,
> methods on this generic function specify how extended sequence
> classes act when they are specified as the result type in a
> CL:CONCATENATE call. RESULT-PROTOTYPE may not be fully initialized
> and thus should only be used for dispatch and to determine its
> class.

### Lambda list
```cl
(sb-impl::result-prototype &rest sb-impl::sequences)
```