ref: 6042bb8adffe111049edfcb8b2eb1ad84814ed69
dir: /appl/cmd/disk/prep/calc.tab.m/
Calc: module { parseexpr: fn(s: string, a, b, c: big): (big, string); init: fn(nil: ref Draw->Context, nil: list of string); NUMBER: con 57346; UNARYMINUS: con 57347; };