regression: constants cannot refer to interior mutable data

[Mark-Simulacrum]

[INFO] [stdout] error[E0492]: constants cannot refer to interior mutable data
[INFO] [stdout]    --> src/lib.rs:583:43
[INFO] [stdout]     |
[INFO] [stdout] 583 |     const VTABLE: &'static Self::VTable = &(*Lhs::VTABLE, *Rhs::VTABLE);
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this borrow of an interior mutable value may end up in the final value
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0492]: constants cannot refer to interior mutable data
[INFO] [stdout]    --> src/lib.rs:587:43
[INFO] [stdout]     |
[INFO] [stdout] 587 |     const VTABLE: &'static Self::VTable = &(*Lhs::VTABLE, *Rhs::VTABLE);
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this borrow of an interior mutable value may end up in the final value
[INFO] [stdout] 

• https://crater-reports.s3.amazonaws.com/beta-1.78-3/beta-2024-03-30/reg/equator-0.1.6/log.txt

[Noratrieb]

probably relevant to @oli-obk @RalfJung

[RalfJung]

Yeah I think this is a duplicate of #121250, which was filed by the author of the affected crate. Cc @sarah-ek

[RalfJung]

This got FCP'd by t-lang as acceptable breakage here, also based on these crater results.

[Mark-Simulacrum]

Sounds good. I'll leave this open in case we decide to include some future-compat release note for it but untag for now.

[apiraino]

I'll preemptively label this breaking change (see prev. comment) for release notes and nominate for T-lang to discuss if these changes should be mentioned in the release notes.

@rustbot label +relnotes +I-lang-nominated