## Function: COMMON-LISP:MAPHASH
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> For each entry in HASH-TABLE, call the designated two-argument function on
> the key and value of the entry. Return NIL.
> 
> Consequences are undefined if HASH-TABLE is mutated during the call to
> MAPHASH, except for changing or removing elements corresponding to the
> current key. The applies to all threads, not just the current one --
> even for synchronized hash-tables. If the table may be mutated by
> another thread during iteration, use eg. SB-EXT:WITH-LOCKED-HASH-TABLE
> to protect the MAPHASH call.

### Lambda list
```cl
(sb-kernel:function-designator hash-table)
```