annotate lab0/tree.mli @ 0:bfdcc3820b32

Basis
author Mike Spivey <mike@cs.ox.ac.uk>
date Thu, 05 Oct 2017 08:04:15 +0100
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mike@0 1 (* lab1/tree.mli *)
mike@0 2 (* Copyright (c) 2017 J. M. Spivey *)
mike@0 3
mike@0 4 (* Abstract syntax *)
mike@0 5
mike@0 6 type expr =
mike@0 7 Number of float (* Constant (value) *)
mike@0 8 | Variable of string (* Variable (name) *)
mike@0 9 | Binop of op * expr * expr (* Binary operator *)
mike@0 10
mike@0 11 and op = Plus | Minus | Times | Divide