## Macro: COMMON-LISP:ECASE
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> ECASE Keyform {({(Key*) | Key} Form*)}*
> Evaluates the Forms in the first clause with a Key EQL to the value of
> Keyform. If none of the keys matches then an error is signalled.

### Lambda list
```cl
(sb-impl::keyform &body sb-impl::cases)
```