Function: -contains-p
-contains-p is a function alias for -contains?, defined in dash.el.
Signature
(-contains-p LIST ELEMENT)
Documentation
Return non-nil if LIST contains ELEMENT.
The test for equality is done with equal, or with -compare-fn
if that is non-nil. As with member, the return value is
actually the tail of LIST whose car is ELEMENT.
Alias: -contains-p.