## Function: COMMON-LISP:TRUENAME
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> If PATHSPEC is a pathname that names an existing file, return
> a pathname that denotes a canonicalized name for the file.  If
> pathspec is a stream associated with a file, return a pathname
> that denotes a canonicalized name for the file associated with
> the stream.
> 
> An error of type FILE-ERROR is signalled if no such file exists
> or if the file system is such that a canonicalized file name
> cannot be determined or if the pathname is wild.
> 
> Under Unix, the TRUENAME of a symlink that links to itself or to
> a file that doesn't exist is considered to be the name of the
> broken symlink itself.

### Lambda list
```cl
(sb-impl::pathspec)
```