File: issue-58022.rs

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rustc 1.88.0%2Bdfsg1-2
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pub trait Foo: Sized {
    const SIZE: usize;

    fn new(slice: &[u8; Foo::SIZE]) -> Self;
    //~^ ERROR: E0790
}

pub struct Bar<T: ?Sized>(T);

impl Bar<[u8]> {
    const SIZE: usize = 32;

    fn new(slice: &[u8; Self::SIZE]) -> Self {
        //~^ ERROR: the size for values of type `[u8]` cannot be known at compilation time
        Foo(Box::new(*slice))
        //~^ ERROR: expected function, tuple struct or tuple variant, found trait `Foo`
    }
}

fn main() {}