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(*s Syntax for arithmetic *)
Infix 6 "<" lt.
Infix 6 "<=" le.
Infix 6 ">" gt.
Infix 6 ">=" ge.
(*i Infix 7 "+" plus. i*)
Grammar constr lassoc_constr4 :=
squash_sum
[ lassoc_constr4($c1) "+" lassoc_constr4($c2) ] ->
case [$c2] of
(SQUASH $T2) ->
case [$c1] of
(SQUASH $T1) -> [ (sumbool $T1 $T2) ] (* {T1}+{T2} *)
| $_ -> [ (sumor $c1 $T2) ] (* c1+{T2} *)
esac
| $_ -> [ (add $c1 $c2) ] (* c1+c2 *)
esac.
Syntax constr
level 4:
sum [ (add $t1 $t2) ] -> [ [<hov 0> $t1:E [0 1] "+" $t2:L ] ]
.
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