rust/tests/ui/consts/const-eval/dangling.rs

use std::mem;

// Make sure we error with the right kind of error on a too large slice.
const TEST: () = { unsafe {
    let slice: *const [u8] = mem::transmute((1usize, usize::MAX));
    let _val = &*slice; //~ ERROR: evaluation of constant value failed
    //~| slice is bigger than largest supported object
} };

fn main() {}
Update tests to remove old numeric constants Part of #68490. Care has been taken to leave the old consts where appropriate, for testing backcompat regressions, module shadowing, etc. The intrinsics docs were accidentally referring to some methods on f64 as std::f64, which I changed due to being contrary with how we normally disambiguate the shadow module from the primitive. In one other place I changed std::u8 to std::ops since it was just testing path handling in macros. For places which have legitimate uses of the old consts, deprecated attributes have been optimistically inserted. Although currently unnecessary, they exist to emphasize to any future deprecation effort the necessity of these specific symbols and prevent them from being accidentally removed. 2020-10-24 19:21:40 -04:00			`use std::mem;`
add test 2019-08-30 15:04:12 +02:00
			`// Make sure we error with the right kind of error on a too large slice.`
get rid of a bunch of unnecessary NOTE in const tests 2021-05-15 15:10:14 +02:00			`const TEST: () = { unsafe {`
add test 2019-08-30 15:04:12 +02:00			`let slice: *const [u8] = mem::transmute((1usize, usize::MAX));`
bless you 2021-06-18 19:31:56 +02:00			`let _val = &*slice; //~ ERROR: evaluation of constant value failed`
get rid of a bunch of unnecessary NOTE in const tests 2021-05-15 15:10:14 +02:00			`//~\| slice is bigger than largest supported object`
add test 2019-08-30 15:04:12 +02:00			`} };`

			`fn main() {}`