ICE reports ignore `--color=never`

rustc +nightly --color=never 123629.rs

// 123629.rs
//@ known-bug: #123629
#![feature(generic_assert)]

fn foo()
where
    for<const N: usize = { assert!(u) }> ():,
{
}

fn main() {}

I expected to see this happen: No colors in the output

Instead, this happened: Colors in the output, around note:

I would guess that the problem is that this unconditionally uses Auto:

https://github.com/rust-lang/rust/blob/646a3f8c15baefb98dc6e0c1c1ba3356db702d2a/compiler/rustc_driver_impl/src/lib.rs#L1481

Meta

rustc --version --verbose:

rustc 1.93.0-nightly (b84478a1c 2025-11-30)
binary: rustc
commit-hash: b84478a1c477756cd3e1974eda867a6bb31e8902
commit-date: 2025-11-30
host: x86_64-unknown-linux-gnu
release: 1.93.0-nightly
LLVM version: 21.1.5

Reproduce the report with rustc +nightly --color=never 123629.rs, then inspect compiler/rustc_driver_impl/src/lib.rs around line 1481, where the issue identifies unconditional Auto color handling. Trace how the command-line color choice reaches the ICE output and verify that the command produces no colored text when done.