symbol equality --cl-rest-- help-function-arglist member vs member* and also equal, eql, and eq

[Stephen J. Turnbull]

MON KEY writes:

 > Why do symbol equality tests/comparisons with --cl-rest-- and
 > `help-function-arglist' be so freaky?

Apparently --cl-rest-- is an uninterned symbol.  This is done so that
the symbol cannot shadow an definition in code outside the cl-arglist
processing module.