SHOVE 'left :right /enfix /set
Shove a parameter into an ACTION! as its first argument
SHOVE is an ACTION!
REVIEW: How might this handle shoving enfix invisibles?
Requests parameter convention based on enfixee's first argument
(uses magic -- SHOVE can't be written easily in usermode yet)
Follow completion rules for enfix, e.g.
1 + 2 <- * 3 is 9
If left hand side is a SET-WORD! or SET-PATH!, shove and assign