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// build-pass (FIXME(62277): could be check-pass?)
#![feature(const_fn)]
struct Foo<T>(T);
struct Bar<T> { x: T }
struct W(f32);
struct A { a: f32 }
const fn basics((a,): (f32,)) -> f32 {
// Deferred assignment:
let b: f32;
b = a + 1.0;
// Immediate assignment:
let c: f32 = b + 1.0;
// Mutables:
let mut d: f32 = c + 1.0;
d = d + 1.0;
// +4 so far.
// No effect statements work:
; ;
1;
// Array projection
let mut arr: [f32; 1] = [0.0];
arr[0] = 1.0;
d = d + arr[0];
// +5
// Field projection:
let mut foo: Foo<f32> = Foo(0.0);
let mut bar: Bar<f32> = Bar { x: 0.0 };
foo.0 = 1.0;
bar.x = 1.0;
d = d + foo.0 + bar.x;
// +7
// Array + Field projection:
let mut arr: [Foo<f32>; 1] = [Foo(0.0)];
arr[0].0 = 1.0;
d = d + arr[0].0;
let mut arr: [Bar<f32>; 1] = [Bar { x: 0.0 }];
arr[0].x = 1.0;
d = d + arr[0].x;
// +9
// Field + Array projection:
let mut arr: Foo<[f32; 1]> = Foo([0.0]);
(arr.0)[0] = 1.0;
d = d + (arr.0)[0];
let mut arr: Bar<[f32; 1]> = Bar { x: [0.0] };
arr.x[0] = 1.0;
d = d + arr.x[0];
// +11
d
}
const fn add_assign(W(a): W) -> f32 {
// Mutables:
let mut d: f32 = a + 1.0;
d += 1.0;
// +2 so far.
// Array projection
let mut arr: [f32; 1] = [0.0];
arr[0] += 1.0;
d += arr[0];
// +3
// Field projection:
let mut foo: Foo<f32> = Foo(0.0);
let mut bar: Bar<f32> = Bar { x: 0.0 };
foo.0 += 1.0;
bar.x += 1.0;
d += foo.0 + bar.x;
// +5
// Array + Field projection:
let mut arr: [Foo<f32>; 1] = [Foo(0.0)];
arr[0].0 += 1.0;
d += arr[0].0;
let mut arr: [Bar<f32>; 1] = [Bar { x: 0.0 }];
arr[0].x += 1.0;
d += arr[0].x;
// +7
// Field + Array projection:
let mut arr: Foo<[f32; 1]> = Foo([0.0]);
(arr.0)[0] += 1.0;
d += (arr.0)[0];
let mut arr: Bar<[f32; 1]> = Bar { x: [0.0] };
arr.x[0] += 1.0;
d += arr.x[0];
// +9
d
}
const fn mul_assign(A { a }: A) -> f32 {
// Mutables:
let mut d: f32 = a + 1.0;
d *= 2.0;
// 2^1 * (a + 1)
// Array projection
let mut arr: [f32; 1] = [1.0];
arr[0] *= 2.0;
d *= arr[0];
// 2^2 * (a + 1)
// Field projection:
let mut foo: Foo<f32> = Foo(1.0);
let mut bar: Bar<f32> = Bar { x: 1.0 };
foo.0 *= 2.0;
bar.x *= 2.0;
d *= foo.0 + bar.x;
// 2^4 * (a + 1)
// Array + Field projection:
let mut arr: [Foo<f32>; 1] = [Foo(1.0)];
arr[0].0 *= 2.0;
d *= arr[0].0;
let mut arr: [Bar<f32>; 1] = [Bar { x: 1.0 }];
arr[0].x *= 2.0;
d *= arr[0].x;
// 2^6 * (a + 1)
// Field + Array projection:
let mut arr: Foo<[f32; 1]> = Foo([1.0]);
(arr.0)[0] *= 2.0;
d *= (arr.0)[0];
let mut arr: Bar<[f32; 1]> = Bar { x: [1.0] };
arr.x[0] *= 2.0;
d *= arr.x[0];
// 2^8 * (a + 1)
d
}
const fn div_assign(a: [f32; 1]) -> f32 {
let a = a[0];
// Mutables:
let mut d: f32 = 1024.0 * a;
d /= 2.0;
// 512
// Array projection
let mut arr: [f32; 1] = [4.0];
arr[0] /= 2.0;
d /= arr[0];
// 256
// Field projection:
let mut foo: Foo<f32> = Foo(4.0);
let mut bar: Bar<f32> = Bar { x: 4.0 };
foo.0 /= 2.0;
bar.x /= 2.0;
d /= foo.0;
d /= bar.x;
// 64
// Array + Field projection:
let mut arr: [Foo<f32>; 1] = [Foo(4.0)];
arr[0].0 /= 2.0;
d /= arr[0].0;
let mut arr: [Bar<f32>; 1] = [Bar { x: 4.0 }];
arr[0].x /= 2.0;
d /= arr[0].x;
// 16
// Field + Array projection:
let mut arr: Foo<[f32; 1]> = Foo([4.0]);
(arr.0)[0] /= 2.0;
d /= (arr.0)[0];
let mut arr: Bar<[f32; 1]> = Bar { x: [4.0] };
arr.x[0] /= 2.0;
d /= arr.x[0];
// 4
d
}
const fn rem_assign(W(a): W) -> f32 {
// Mutables:
let mut d: f32 = a;
d %= 10.0;
d += 10.0;
// Array projection
let mut arr: [f32; 1] = [3.0];
arr[0] %= 2.0;
d %= 9.0 + arr[0];
d += 10.0;
// Field projection:
let mut foo: Foo<f32> = Foo(5.0);
let mut bar: Bar<f32> = Bar { x: 7.0 };
foo.0 %= 2.0;
bar.x %= 2.0;
d %= 8.0 + foo.0 + bar.x;
d += 10.0;
// Array + Field projection:
let mut arr: [Foo<f32>; 1] = [Foo(4.0)];
arr[0].0 %= 3.0;
d %= 9.0 + arr[0].0;
d += 10.0;
let mut arr: [Bar<f32>; 1] = [Bar { x: 7.0 }];
arr[0].x %= 3.0;
d %= 9.0 + arr[0].x;
d += 10.0;
// Field + Array projection:
let mut arr: Foo<[f32; 1]> = Foo([6.0]);
(arr.0)[0] %= 5.0;
d %= 9.0 + (arr.0)[0];
let mut arr: Bar<[f32; 1]> = Bar { x: [11.0] };
arr.x[0] %= 5.0;
d %= 9.0 + arr.x[0];
d
}
const fn sub_assign(W(a): W) -> f32 {
// Mutables:
let mut d: f32 = a;
d -= 1.0;
// Array projection
let mut arr: [f32; 1] = [2.0];
arr[0] -= 1.0;
d -= arr[0];
// Field projection:
let mut foo: Foo<f32> = Foo(2.0);
let mut bar: Bar<f32> = Bar { x: 2.0 };
foo.0 -= 1.0;
bar.x -= 1.0;
d -= foo.0 + bar.x;
// Array + Field projection:
let mut arr: [Foo<f32>; 1] = [Foo(2.0)];
arr[0].0 -= 1.0;
d -= arr[0].0;
let mut arr: [Bar<f32>; 1] = [Bar { x: 2.0 }];
arr[0].x -= 1.0;
d -= arr[0].x;
// Field + Array projection:
let mut arr: Foo<[f32; 1]> = Foo([2.0]);
(arr.0)[0] -= 1.0;
d -= (arr.0)[0];
let mut arr: Bar<[f32; 1]> = Bar { x: [2.0] };
arr.x[0] -= 1.0;
d -= arr.x[0];
d
}
macro_rules! test {
($c:ident, $e:expr, $r:expr) => {
const $c: f32 = $e;
assert_eq!($c, $r);
assert_eq!($e, $r);
}
}
fn main() {
test!(BASICS, basics((2.0,)), 13.0);
test!(ADD, add_assign(W(1.0)), 10.0);
test!(MUL, mul_assign(A { a: 0.0 }), 256.0);
test!(DIV, div_assign([1.0]), 4.0);
test!(REM, rem_assign(W(5.0)), 5.0);
test!(SUB, sub_assign(W(8.0)), 0.0);
}
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