incompatible_msrv reported even when method is not called

[ijackson]

Summary

In our code we take the fn value std::any::TypeId::of::<something> in a const context. We later call that function value in a non-const context. This triggers this warning even though our code does not have an MSRV violation.

Lint Name

incompatible_msrv

Reproducer

I tried this code (note that ::of isn't called: we have of::<()> not of::<()>():

// in `Cargo.toml`
// rust-version = "1.85.1"

const _ : () = {
    let _ = std::any::TypeId::of::<()>;
};

I saw this happen:

warning: current MSRV (Minimum Supported Rust Version) is `1.85.1` but this item is stable in a `const` context since `1.91.0`
 --> src/lib.rs:3:13
  |
3 |     let _ = std::any::TypeId::of::<()>;
  |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/beta/index.html#incompatible_msrv
  = note: `#[warn(clippy::incompatible_msrv)]` on by default

I expected to see this happen:

clippy is happy.

Version

rustc 1.91.0-beta.4 (aa7859c0d 2025-09-27)
binary: rustc
commit-hash: aa7859c0dec2de6c9cab34b03028bcef7b1fc25d
commit-date: 2025-09-27
host: x86_64-unknown-linux-gnu
release: 1.91.0-beta.4
LLVM version: 21.1.1

Additional Labels

@rustbot label +regression-from-stable-to-beta

[rustbot]

Error: Label regression-from-stable-to-beta can only be set by Rust team members

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[ijackson]

Could someone please set the regression-from-stable-to-beta label?

[samueltardieu]

This label isn't present in the Clippy repository. I've set a P-medium priority because this is a regression but it isn't likely to affect many people in existing code and can be worked around by allowing the lint locally until this is fixed (or even expecting it to ensure the allow won't stay forever).