sig lpbasicgram.
accum_sig lambdayacc, lpbasic_absyn.

type plust, timest, dividet, minust, eqt, expt, lparen, rparen, printt   gs.
type semicolon, comma, ift, thent, elset, whilet, lett, intok, endt  gs.
type andt, ort, nott, assignt, begint, lesst   gs.

type exp lbexp -> gs.     % lpexp is abstract syntax for lpbasic expression.
type stat lbst -> gs.
type astat lbst -> gs.
type statlist (list lbst) -> gs.