1 error: recursion limit reached while expanding `concat!`
2 --> $DIR/issue-84632-eager-expansion-recursion-limit.rs:8:28
4 LL | (A, $($A:ident),*) => (concat!("", a!($($A),*)))
5 | ^^^^^^^^^^^^^^^^^^^^^^^^
7 LL | a!(A, A, A, A, A, A, A, A, A, A, A);
8 | ----------------------------------- in this macro invocation
10 = help: consider increasing the recursion limit by adding a `#![recursion_limit = "30"]` attribute to your crate (`issue_84632_eager_expansion_recursion_limit`)
11 = note: this error originates in the macro `a` (in Nightly builds, run with -Z macro-backtrace for more info)
13 error: aborting due to previous error