mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-24 07:44:10 +00:00
23 lines
553 B
Rust
23 lines
553 B
Rust
// revisions: full min
|
|
|
|
#![cfg_attr(full, feature(generic_const_exprs))]
|
|
#![cfg_attr(full, allow(incomplete_features))]
|
|
|
|
pub const fn is_zst<T: ?Sized>() -> usize {
|
|
if std::mem::size_of::<T>() == 0 {
|
|
1
|
|
} else {
|
|
0
|
|
}
|
|
}
|
|
|
|
pub struct AtLeastByte<T: ?Sized> {
|
|
value: T,
|
|
//~^ ERROR the size for values of type `T` cannot be known at compilation time
|
|
pad: [u8; is_zst::<T>()],
|
|
//[min]~^ ERROR generic parameters may not be used in const operations
|
|
//[full]~^^ ERROR unconstrained generic constant
|
|
}
|
|
|
|
fn main() {}
|