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+warning: conflicting implementations of trait `SadBee` for type `for<'a> fn(&'a ())`
+ --> $DIR/invariant.rs:14:1
+ |
+LL | impl SadBee for for<'a> fn(&'a ()) {
+ | ---------------------------------- first implementation here
+...
+LL | impl SadBee for fn(&'static ()) {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `for<'a> fn(&'a ())`
+ |
+ = note: `#[warn(coherence_leak_check)]` on by default
+ = 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 <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
+
+error[E0308]: mismatched types
+ --> $DIR/invariant.rs:27:5
+ |
+LL | v
+ | ^ one type is more general than the other
+ |
+ = note: expected reference `&Foo<fn(&())>`
+ found reference `&Foo<for<'a> fn(&'a ())>`
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0308`.