summaryrefslogtreecommitdiffstats
path: root/src/test/ui/const-generics/const-argument-if-length.rs
blob: db1eafca2c7222186503d3276dd4cfe73f7bf1d7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
// 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() {}