warning: conflicting implementations of trait `Trait` for type `for<'r> fn(fn(&'r ()))`
  --> $DIR/coherence-fn-covariant-bound-vs-static.rs:22:1
   |
LL | impl Trait for for<'r> fn(fn(&'r ())) {}
   | ------------------------------------- first implementation here
LL | impl<'a> Trait for fn(fn(&'a ())) {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `for<'r> fn(fn(&'r ()))`
   |
   = warning: the behavior may change in a future release
   = note: for more information, see issue #56105 <https://github.com/rust-lang/rust/issues/56105>
   = note: this behavior recently changed as a result of a bug fix; see rust-lang/rust#56105 for details
   = note: `#[warn(coherence_leak_check)]` on by default

warning: 1 warning emitted