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ices/57739.rs: fixed with errors #579

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Issue: rust-lang/rust#57739

trait ArraySizeTrait {
     const SIZE: usize = 0;
}

// remove this impl to get error E0599 instead of ICE
impl<T : ?Sized> ArraySizeTrait for T {
    const SIZE: usize = 1;
}

struct SomeArray<T: ArraySizeTrait> {
    array: [u8; T::SIZE],
    phantom: std::marker::PhantomData<T>,
}

fn main() {

}
=== stdout ===
=== stderr ===
error: generic parameters may not be used in const operations
  --> /home/runner/work/glacier/glacier/ices/57739.rs:11:17
   |
11 |     array: [u8; T::SIZE],
   |                 ^^^^^^^ cannot perform const operation using `T`
   |
   = note: type parameters may not be used in const expressions
   = help: use `#![feature(const_generics)]` and `#![feature(const_evaluatable_checked)]` to allow generic const expressions

error: aborting due to previous error

==============

=== stdout ===
=== stderr ===
error: generic parameters may not be used in const operations
  --> /home/runner/work/glacier/glacier/ices/57739.rs:11:17
   |
11 |     array: [u8; T::SIZE],
   |                 ^^^^^^^ cannot perform const operation using `T`
   |
   = note: type parameters may not be used in const expressions
   = help: use `#![feature(const_generics)]` and `#![feature(const_evaluatable_checked)]` to allow generic const expressions

error: aborting due to previous error

==============
@Alexendoo Alexendoo deleted the autofix/ices/57739.rs branch January 2, 2021 14:07
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2 participants