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$include <prelude.sail>
$include <generic_equality.sail>
/* Test constant propagation part of monomorphisation involving
functions. We should reduce a function application when the
arguments are suitable values, the function is pure and the result
is a value.
*/
enum AnEnum = One | Two | Three
union EnumlikeUnion = { First, Second }
union ProperUnion = {
Stuff : AnEnum,
Nonsense : EnumLikeUnion
}
val canReduce : AnEnum -> AnEnum
function canReduce (x) = {
match (x) {
One => Two,
x => x
}
}
val cannotReduce : AnEnum -> int
function cannotReduce (x) = {
let y : int = match (x) { One => 1, _ => 5 } in
2 + y
}
register whatever : int
val impure : AnEnum -> AnEnum
function impure (x) = {
match (x) {
One => Two,
x => let _ = whatever in x
}
}
val canReduceUnion : AnEnum -> EnumlikeUnion
function canReduceUnion (x) = {
match (x) {
One => First,
_ => Second
}
}
val canReduceUnion2 : AnEnum -> ProperUnion
function canReduceUnion2 (x) = {
match (x) {
One => Nonsense(First),
y => Stuff(y)
}
}
val test : AnEnum -> (AnEnum,int,AnEnum,EnumlikeUnion,ProperUnion)
function test (x) = {
let a = canReduce(x) in
let b = cannotReduce(x) in
let c = impure(x) in
let d = canReduceUnion(x) in
let e = canReduceUnion2(x) in
(a,b,c,d,e)
}
val run : unit -> unit
function run () = {
assert(test(One) == (Two,3,Two,First,Nonsense(First)));
assert(test(Two) == (Two,7,Two,Second,Stuff(Two)));
assert(test(Three) == (Three,7,Three,Second,Stuff(Three)));
}
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