http::HeaderName interacts poorly with declare_interior_mutable_const

[lucacasonato]

Summary

The reproducer code emits a declare_interior_mutable_const warning, even though HeaderName is not interior mutable AFAICT.

Lint Name

declare_interior_mutable_const

Reproducer

use http::HeaderName;

const X_FOO_BAR: HeaderName = HeaderName::from_static("x-foo-bar");

Version

rustc 1.64.0 (a55dd71d5 2022-09-19)
binary: rustc
commit-hash: a55dd71d5fb0ec5a6a3a9e8c27b2127ba491ce52
commit-date: 2022-09-19
host: aarch64-apple-darwin
release: 1.64.0
LLVM version: 14.0.6

Additional Labels

No response

[lucacasonato]

Quite possibly caused by #5812.

[rail-rain]

The lints now (#11678) don't think of Bytes as interior mutable. It's probably a bug in the implementation that types that wrap Bytes still trigger the lints.

[djc]

This also seems to trigger mutable_key_type, which seems unwarranted as well. Would be nice to get this fixed?

[ThinkerDreamer]

It also seems triggered by http::header::value::HeaderValue which has Bytes inside as well.

const MY_HEADER_VAL: HeaderValue = HeaderValue::from_static("my_header_value");

[djc]

@Alexendoo awesome, thanks!