GCA: `tracing` crate is unusable

Code

I tried this code:

tracing::debug!(
    %id,
    adapter_info = ?adapter_info,
    "Compatible adapter found"
);

https://github.com/nazar-pc/abundance/blob/3d931f62d0a7c85e29a179f67bcb31b1eafeadae/crates/farmer/ab-proof-of-space-gpu/src/host.rs#L123-L127

This is something that works on stable and worked on nightly before. Now I added this to the crate (I used generic_const_exprs before):

#![feature(generic_const_args, generic_const_items, min_generic_const_args)]

I expected to see this happen: Code compiles

Instead, this happened:

error[E0107]: missing generics for struct `tracing::__macro_support::FieldName`
    --> crates/farmer/ab-proof-of-space-gpu/src/host.rs:123:25
     |
 123 | /                         debug!(
 124 | |                             %id,
 125 | |                             adapter_info = ?adapter_info,
 126 | |                             "Compatible adapter found"
 127 | |                         );
     | |_________________________^ expected 1 generic argument
     |
note: struct defined here, with 1 generic parameter: `N`
    --> /home/nazar-pc/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tracing-0.1.44/src/lib.rs:1074:16
     |
1074 |     pub struct FieldName<const N: usize>([u8; N]);
     |                ^^^^^^^^^ --------------
     = note: this error originates in the macro `$crate::__tracing_stringify` which comes from the expansion of the macro `debug` (in Nightly builds, run with -Z macro-backtrace for more info)
help: add missing generic argument
    -->  /home/nazar-pc/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tracing-0.1.44/src/macros.rs:3250:47
     |
3250 |             $crate::__macro_support::FieldName<N>::len($crate::__macro_support::stringify!($($k).+))
     |                                               +++

Version it worked on

Any stable version, nightly at least until nightly-2026-05-03 (without GCA)

Version with regression

rustc --version --verbose:

rustc 1.98.0-nightly (cced03bfd 2026-05-28)
binary: rustc
commit-hash: cced03bfd61a304243a34504618ecec86c17063f
commit-date: 2026-05-28
host: x86_64-unknown-linux-gnu
release: 1.98.0-nightly
LLVM version: 22.1.6

This is the version I'm using right now that has this issue, I didn't use GCA before so not sure when it regressed exactly.

Reproduce the failure with the tracing::debug! snippet from crates/farmer/ab-proof-of-space-gpu/src/host.rs and the reported nightly compiler. Inspect tracing-0.1.44/src/macros.rs around the __tracing_stringify expansion and tracing-0.1.44/src/lib.rs where FieldName is defined; done means the example compiles again with generic const arguments enabled.