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procedure P(a: [int]bool, b: [int]ref, c: [bool]bool)
{
assert a == b; // type error
assert a == c; // type error
assert a == a[5 := true];
assert a == a[true := true]; // type error
assert a == a[5 := 5]; // type error in RHS
assert a == b[5 := null]; // type error
}
procedure Q(aa: [int,ref]bool)
{
assert aa[5,null := true] != aa[2,null := false];
assert aa == aa[null,null := true]; // type error, index 0
assert aa == aa[5,true := true]; // type error, index 1
assert aa == aa[5,null := null]; // type error, RHS
}
type Field a;
const unique IntField: Field int;
const unique RefField: Field ref;
const unique SomeField: Field any;
procedure R(H: <x>[ref,Field x]x, this: ref)
{
var i: int, r: ref, y: any;
var K: <wz>[ref,Field wz]wz;
i := H[this, IntField];
r := H[this, RefField];
y := H[this, IntField]; // type error, wrong LHS
y := H[this, SomeField];
K := H[this, IntField := i][this, RefField := r][this, SomeField := y];
K := H[this, SomeField := r]; // type error, wrong RHS
K := K[this, IntField := r]; // RHS has wrong type (ref, expecting int)
K := K[this, RefField := i]; // RHS has wrong type (int, expecting ref)
}
type ref, any;
const null : ref;
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