## Function: COMMON-LISP:ENSURE-DIRECTORIES-EXIST
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> Test whether the directories containing the specified file
> actually exist, and attempt to create them if they do not.
> The MODE argument is a CMUCL/SBCL-specific extension to control
> the Unix permission bits.

### Lambda list
```cl
(sb-impl::pathspec &key sb-impl::verbose sb-impl::mode)
```