Type which uses const generics leads to ICE when using Derive #60724
Description
This code
#![feature(const_generics)] #[derive(Debug)] struct X<const N: usize> { a: [u32; N], }leads to
--> src/lib.rs:1:12 | 1 | #![feature(const_generics)] | ^^^^^^^^^^^^^^ error[E0107]: wrong number of const arguments: expected 1, found 0 thread 'rustc' panicked at 'assertion failed: `(left == right)` left: `[type error]`, right: `usize`', src/librustc/ty/sty.rs:2279:9 note: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace. error: aborting due to previous error For more information about this error, try `rustc --explain E0107`. error: internal compiler error: unexpected panic note: the compiler unexpectedly panicked. this is a bug. It doesn't seem Debug related, since the same happens for deriving Copy.