rust/tests/ui/consts/const-fn-error.rs

const X : usize = 2;

const fn f(x: usize) -> usize {
    let mut sum = 0;
    for i in 0..x {
        //~^ ERROR cannot use `for`
        //~| ERROR cannot use `for`
        sum += i;
    }
    sum
}

#[allow(unused_variables)]
fn main() {
    let a : [i32; f(X)];
}
move const block checks before lowering step this makes sure the checks run before typeck (which might use the constant or const function to calculate an array length) and gives prettier error messages in case of for loops and such (since they aren't expanded yet). 2016-01-15 13:16:54 +01:00			`const X : usize = 2;`

			`const fn f(x: usize) -> usize {`
Produce instead of pointers 2018-01-16 09:24:38 +01:00			`let mut sum = 0;`
Rebase fallout 2018-10-01 12:52:47 +02:00			`for i in 0..x {`
Get rid of HIR const checker 2024-11-22 02:31:42 +00:00			//~^ ERROR cannot use `for`
			//~\| ERROR cannot use `for`
move const block checks before lowering step this makes sure the checks run before typeck (which might use the constant or const function to calculate an array length) and gives prettier error messages in case of for loops and such (since they aren't expanded yet). 2016-01-15 13:16:54 +01:00			`sum += i;`
			`}`
Produce instead of pointers 2018-01-16 09:24:38 +01:00			`sum`
move const block checks before lowering step this makes sure the checks run before typeck (which might use the constant or const function to calculate an array length) and gives prettier error messages in case of for loops and such (since they aren't expanded yet). 2016-01-15 13:16:54 +01:00			`}`

			`#[allow(unused_variables)]`
			`fn main() {`
Report const eval error inside the query 2018-08-26 15:19:34 +02:00			`let a : [i32; f(X)];`
move const block checks before lowering step this makes sure the checks run before typeck (which might use the constant or const function to calculate an array length) and gives prettier error messages in case of for loops and such (since they aren't expanded yet). 2016-01-15 13:16:54 +01:00			`}`