warning: conflicting implementations of trait `Trait` for type `for<'a, 'b> fn(&'a u32, &'b u32)`
  --> $DIR/coherence-fn-inputs.rs:16:1
   |
LL | impl Trait for for<'a, 'b> fn(&'a u32, &'b u32) {}
   | ----------------------------------------------- first implementation here
LL | impl Trait for for<'c> fn(&'c u32, &'c u32) {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `for<'a, 'b> fn(&'a u32, &'b u32)`
   |
   = 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