Change leak check lint message to behavior is likely to change in the future

compiler/rustc_lint_defs/src/builtin.rs

@@ -1503,7 +1503,7 @@ declare_lint! {
     Warn,
     "distinct impls distinguished only by the leak-check code",
     @future_incompatible = FutureIncompatibleInfo {
-        reason: FutureIncompatibilityReason::FutureReleaseErrorDontReportInDeps,
+        reason: FutureIncompatibilityReason::Custom("the behavior may change in a future release"),
         reference: "issue #56105 <https://github.com/rust-lang/rust/issues/56105>",
     };
 }

tests/ui/coherence/coherence-fn-implied-bounds.rs

@@ -20,7 +20,7 @@ impl Trait for for<'a, 'b> fn(&'a &'b u32, &'b &'a u32) -> &'b u32 {}
 
 impl Trait for for<'c> fn(&'c &'c u32, &'c &'c u32) -> &'c u32 {
     //~^ ERROR conflicting implementations
-    //~| WARNING this was previously accepted by the compiler
+    //~| WARN the behavior may change in a future release
 }
 
 fn main() {}

tests/ui/coherence/coherence-fn-implied-bounds.stderr

@@ -7,7 +7,7 @@ LL |
 LL | impl Trait for for<'c> fn(&'c &'c u32, &'c &'c u32) -> &'c u32 {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `for<'a, 'b> fn(&'a &'b u32, &'b &'a u32) -> &'b u32`
    |
-   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = 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: the lint level is defined here

tests/ui/coherence/coherence-free-vs-bound-region.rs

@@ -15,7 +15,7 @@ impl<'a> TheTrait for fn(&'a u8) {}
 
 impl TheTrait for fn(&u8) {
     //~^ ERROR conflicting implementations of trait
-    //~| WARNING this was previously accepted by the compiler
+    //~| WARN the behavior may change in a future release
 }
 
 fn main() {}

tests/ui/coherence/coherence-free-vs-bound-region.stderr

@@ -7,7 +7,7 @@ LL |
 LL | impl TheTrait for fn(&u8) {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `fn(&u8)`
    |
-   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = 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: the lint level is defined here

tests/ui/coherence/coherence-subtyping.rs

@@ -13,8 +13,8 @@ trait TheTrait {
 impl TheTrait for for<'a, 'b> fn(&'a u8, &'b u8) -> &'a u8 {}
 
 impl TheTrait for for<'a> fn(&'a u8, &'a u8) -> &'a u8 {
-    //~^ WARNING conflicting implementation
+    //~^ WARN conflicting implementation
-    //~^^ WARNING this was previously accepted by the compiler but is being phased out
+    //~| WARN the behavior may change in a future release
 }
 
 fn main() {}

tests/ui/coherence/coherence-subtyping.stderr

@@ -7,7 +7,7 @@ LL |
 LL | impl TheTrait for for<'a> fn(&'a u8, &'a u8) -> &'a u8 {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `for<'a, 'b> fn(&'a u8, &'b u8) -> &'a u8`
    |
-   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = 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

tests/ui/coherence/coherence-wasm-bindgen.rs

@@ -31,7 +31,7 @@ where
     R: ReturnWasmAbi,
 {
     //~^^^^^ ERROR conflicting implementation
-    //~| WARNING this was previously accepted
+    //~| WARN the behavior may change in a future release
 }
 
 fn main() {}

tests/ui/coherence/coherence-wasm-bindgen.stderr

@@ -13,7 +13,7 @@ LL | |     A: RefFromWasmAbi,
 LL | |     R: ReturnWasmAbi,
    | |_____________________^ conflicting implementation for `&dyn Fn(&_) -> _`
    |
-   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = 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: downstream crates may implement trait `FromWasmAbi` for type `&_`
    = note: this behavior recently changed as a result of a bug fix; see rust-lang/rust#56105 for details

tests/ui/coherence/negative-coherence-placeholder-region-constraints-on-unification.explicit.stderr

@@ -6,7 +6,7 @@ LL | impl<T: ?Sized + Marker> FnMarker for fn(T) {}
 LL | impl<T: ?Sized> FnMarker for fn(&T) {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `fn(&_)`
    |
-   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = 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: the lint level is defined here

tests/ui/coherence/negative-coherence-placeholder-region-constraints-on-unification.rs

@@ -20,6 +20,6 @@ trait FnMarker {}
 impl<T: ?Sized + Marker> FnMarker for fn(T) {}
 impl<T: ?Sized> FnMarker for fn(&T) {}
 //[explicit]~^ ERROR conflicting implementations of trait `FnMarker` for type `fn(&_)`
-//[explicit]~| WARN this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+//[explicit]~| WARN the behavior may change in a future release
 
 fn main() {}

tests/ui/const-generics/invariant.rs

@@ -12,18 +12,16 @@ impl SadBee for for<'a> fn(&'a ()) {
     const ASSOC: usize = 0;
 }
 impl SadBee for fn(&'static ()) {
-    //~^ WARNING conflicting implementations of trait
+    //~^ WARN conflicting implementations of trait
-    //~| WARNING this was previously accepted
+    //~| WARN the behavior may change in a future release
     const ASSOC: usize = 100;
 }
 
 struct Foo<T: SadBee>([u8; <T as SadBee>::ASSOC], PhantomData<T>)
 where
-    [(); <T as SadBee>::ASSOC]: ;
+    [(); <T as SadBee>::ASSOC]:;
 
-fn covariant(
+fn covariant(v: &'static Foo<for<'a> fn(&'a ())>) -> &'static Foo<fn(&'static ())> {
-    v: &'static Foo<for<'a> fn(&'a ())>
-) -> &'static Foo<fn(&'static ())> {
     v
     //~^ ERROR mismatched types
 }

tests/ui/const-generics/invariant.stderr

@@ -7,13 +7,13 @@ LL | impl SadBee for for<'a> fn(&'a ()) {
 LL | impl SadBee for fn(&'static ()) {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `for<'a> fn(&'a ())`
    |
-   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = 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
 
 error[E0308]: mismatched types
-  --> $DIR/invariant.rs:27:5
+  --> $DIR/invariant.rs:25:5
    |
 LL |     v
    |     ^ one type is more general than the other