error: conflicting implementations of trait `TheTrait` for type `fn(&u8)` --> $DIR/coherence-free-vs-bound-region.rs:16:1 | LL | impl<'a> TheTrait for fn(&'a u8) {} | -------------------------------- first implementation here LL | LL | impl TheTrait for fn(&u8) { | ^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `fn(&u8)` | note: the lint level is defined here --> $DIR/coherence-free-vs-bound-region.rs:10:9 | LL | #![deny(coherence_leak_check)] | ^^^^^^^^^^^^^^^^^^^^ = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! = note: for more information, see issue #56105 = note: this behavior recently changed as a result of a bug fix; see rust-lang/rust#56105 for details error: aborting due to previous error