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|
use rt::{compile, status};
type err_int = !int;
type err_recur = !*err_recur;
fn assignability() void = {
// Error and non-error types are interchangable:
let a: !int = 10;
let b: int = a;
assert(a == b);
compile(status::CHECK, `
type err = !void;
fn reterr() (int | err) = {
return err;
};
fn properr() void = {
reterr()?;
};
export fn main() void = void;
`)!; // error types cannot be assigned to void
};
type error = !void;
fn err_if_false(in: bool) (error | int) = {
if (in) {
return 1337;
};
return error;
};
fn indirect(in: bool) (error | int) = {
let x = err_if_false(in)?;
return x;
};
fn propagate() void = {
assert(indirect(true) as int == 1337);
assert(indirect(false) is error);
};
fn cannotignore() void = {
compile(status::CHECK, "
type error = !void;
export fn main() void = {
error;
};
")!;
compile(status::CHECK, "
type error = !int;
export fn main() void = {
let x: error = 0;
x;
};
")!;
compile(status::CHECK, "
type error = !int;
export fn main() void = {
let x: (error | void) = void;
x;
};
")!;
err_if_false(true)!;
};
fn discard() void = {
let x: error = error;
let x: (int | error) = error;
let x = err_if_false(false);
x = error;
x = err_if_false(false);
// XXX: type inference currently doesn't work because of the temporary
// fix for https://todo.sr.ht/~sircmpwn/hare/951. once that ticket is
// actually fixed, the explicit type here can be removed
let _: error = error;
let _ = err_if_false(false);
_ = error;
_ = err_if_false(false);
for (let x => done: (int | done | !void)) void;
for (let _ => done: (int | done | !void)) void;
compile(status::CHECK, `fn f() void = for (let x => done: (int | done | !void)) x;`)!;
};
fn measurements() void = {
assert(size(!int) == size(int));
assert(size(!f64) == size(f64));
assert(size(!(int | void)) == size((int | void)));
assert(size(!(i8, rune)) == size((i8, rune)));
assert(size(!struct { x: int, y: str }) == size(struct { x: int, y: str }));
assert(size(!union { x: int, y: str }) == size(union { x: int, y: str }));
assert(size(![2]int) == size([2]int));
assert(size(![]int) == size([]int));
assert(size(!*size) == size(*size));
assert(align(!int) == align(int));
assert(align(!f64) == align(f64));
assert(align(!(int | void)) == align((int | void)));
assert(align(!(i8, rune)) == align((i8, rune)));
assert(align(!struct { x: int, y: str }) == align(struct { x: int, y: str }));
assert(align(!union { x: int, y: str }) == align(union { x: int, y: str }));
assert(align(![2]int) == align([2]int));
assert(align(![*]int) == align([*]int));
assert(align(![]int) == align([]int));
assert(align(!*size) == align(*size));
};
type err_done_tagged_union = !(int | done);
type done_tagged_union = (int | done);
type err_done_tagged_union_alias = !done_tagged_union;
fn disallowed_types() void = {
compile(status::CHECK, `type t = !done;`)!;
compile(status::CHECK, `type t = done; type u = t; type v = !u;`)!;
compile(status::CHECK, `fn f() !never;`)!;
};
export fn main() void = {
assignability();
propagate();
cannotignore();
discard();
measurements();
disallowed_types();
};
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