rust/tests/crashes/121429.rs

//@ known-bug: #121429

#![feature(generic_const_exprs)]

struct FixedI8<const X: usize>;
const FRAC_LHS: usize = 0;
const FRAC_RHS: usize = 1;

pub trait True {}

impl<const N: usize = { const { 3 } }> PartialEq<FixedI8<FRAC_RHS>> for FixedI8<FRAC_LHS> where
    If<{}>: True
{
}
tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-03-30 00:21:25 +01:00			`//@ known-bug: #121429`

			`#![feature(generic_const_exprs)]`

Move `Const::{from_anon_const,try_from_lit}` to hir_ty_lowering These operations are much more about lowering the HIR than about `Const`s themselves. They fit better in hir_ty_lowering with `lower_const_arg` (formerly `Const::from_const_arg`) and the rest. To accomplish this, `const_evaluatable_predicates_of` had to be changed to not use `from_anon_const` anymore. Instead of visiting the HIR and lowering anon consts on the fly, it now visits the `rustc_middle::ty` data structures instead and directly looks for `UnevaluatedConst`s. This approach was proposed in: https://github.com/rust-lang/rust/pull/131081#discussion_r1821189257 2024-11-28 22:04:03 -08:00			`struct FixedI8<const X: usize>;`
			`const FRAC_LHS: usize = 0;`
			`const FRAC_RHS: usize = 1;`

tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-03-30 00:21:25 +01:00			`pub trait True {}`

			`impl<const N: usize = { const { 3 } }> PartialEq<FixedI8<FRAC_RHS>> for FixedI8<FRAC_LHS> where`
			`If<{}>: True`
			`{`
			`}`