rust/tests/ui/cast/cast-to-bare-fn.rs

fn foo(_x: isize) { }

fn main() {
    let v: u64 = 5;
    let x = foo as extern "C" fn() -> isize;
    //~^ ERROR non-primitive cast
    let y = v as extern "Rust" fn(isize) -> (isize, isize);
    //~^ ERROR non-primitive cast
    y(x());
}
Update compile fail tests to use isize. 2015-01-08 04:54:35 -06:00			`fn foo(_x: isize) { }`
Typeck: Disallow scalar casts to bare_fn. Bare functions are another example of a scalar but non-numeric type (like char) that should be handled separately in casts. This disallows expressions like `0 as extern "Rust" fn() -> int;`. It might be advantageous to allow casts between bare functions and raw pointers in unsafe code in the future, to pass function pointers between Rust and C. Closes #8728 2013-10-09 17:36:26 -05:00
			`fn main() {`
			`let v: u64 = 5;`
Update compile fail tests to use isize. 2015-01-08 04:54:35 -06:00			`let x = foo as extern "C" fn() -> isize;`
wording improvement 2017-06-09 15:04:29 -05:00			`//~^ ERROR non-primitive cast`
Update compile fail tests to use isize. 2015-01-08 04:54:35 -06:00			`let y = v as extern "Rust" fn(isize) -> (isize, isize);`
wording improvement 2017-06-09 15:04:29 -05:00			`//~^ ERROR non-primitive cast`
Typeck: Disallow scalar casts to bare_fn. Bare functions are another example of a scalar but non-numeric type (like char) that should be handled separately in casts. This disallows expressions like `0 as extern "Rust" fn() -> int;`. It might be advantageous to allow casts between bare functions and raw pointers in unsafe code in the future, to pass function pointers between Rust and C. Closes #8728 2013-10-09 17:36:26 -05:00			`y(x());`
			`}`