Change suspicious auto trait lint message to has potentially surprisi…

…ng behavior

compiler/rustc_lint_defs/src/builtin.rs

@@ -4061,7 +4061,7 @@ declare_lint! {
     Warn,
     "the rules governing auto traits have recently changed resulting in potential breakage",
     @future_incompatible = FutureIncompatibleInfo {
-        reason: FutureIncompatibilityReason::FutureReleaseSemanticsChange,
+        reason: FutureIncompatibilityReason::Custom("has potentially surprising behavior"),
         reference: "issue #93367 <https://github.com/rust-lang/rust/issues/93367>",
     };
 }

tests/ui/auto-traits/suspicious-impls-lint.rs

@@ -8,7 +8,7 @@ unsafe impl<T: Send> Send for MayImplementSendOk<T> {} // ok
 struct MayImplementSendErr<T>(T);
 unsafe impl<T: Send> Send for MayImplementSendErr<&T> {}
 //~^ ERROR
-//~| WARNING this will change its meaning
+//~| WARNING has potentially surprising behavior
 
 struct ContainsNonSendDirect<T>(*const T);
 unsafe impl<T: Send> Send for ContainsNonSendDirect<&T> {} // ok
@@ -20,7 +20,7 @@ unsafe impl<T: Send> Send for ContainsIndirectNonSend<&T> {} // ok
 struct ContainsVec<T>(Vec<T>);
 unsafe impl Send for ContainsVec<i32> {}
 //~^ ERROR
-//~| WARNING this will change its meaning
+//~| WARNING has potentially surprising behavior
 
 struct TwoParams<T, U>(T, U);
 unsafe impl<T: Send, U: Send> Send for TwoParams<T, U> {} // ok
@@ -31,20 +31,20 @@ unsafe impl<T: Send, U: Send> Send for TwoParamsFlipped<U, T> {} // ok
 struct TwoParamsSame<T, U>(T, U);
 unsafe impl<T: Send> Send for TwoParamsSame<T, T> {}
 //~^ ERROR
-//~| WARNING this will change its meaning
+//~| WARNING has potentially surprising behavior
 
 pub struct WithPhantomDataNonSend<T, U>(PhantomData<*const T>, U);
 unsafe impl<T> Send for WithPhantomDataNonSend<T, i8> {} // ok
 
 pub struct WithPhantomDataSend<T, U>(PhantomData<T>, U);
 unsafe impl<T> Send for WithPhantomDataSend<*const T, i8> {}
 //~^ ERROR
-//~| WARNING this will change its meaning
+//~| WARNING has potentially surprising behavior
 
 pub struct WithLifetime<'a, T>(&'a (), T);
 unsafe impl<T> Send for WithLifetime<'static, T> {} // ok
 unsafe impl<T> Sync for WithLifetime<'static, Vec<T>> {}
 //~^ ERROR
-//~| WARNING this will change its meaning
+//~| WARNING has potentially surprising behavior
 
 fn main() {}

tests/ui/auto-traits/suspicious-impls-lint.stderr

@@ -4,7 +4,7 @@ error: cross-crate traits with a default impl, like `Send`, should not be specia
 LL | unsafe impl<T: Send> Send for MayImplementSendErr<&T> {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this will change its meaning in a future release!
+   = warning: has potentially surprising behavior
    = note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
    = note: `&T` is not a generic parameter
 note: try using the same sequence of generic parameters as the struct definition
@@ -24,7 +24,7 @@ error: cross-crate traits with a default impl, like `Send`, should not be specia
 LL | unsafe impl Send for ContainsVec<i32> {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this will change its meaning in a future release!
+   = warning: has potentially surprising behavior
    = note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
    = note: `i32` is not a generic parameter
 note: try using the same sequence of generic parameters as the struct definition
@@ -39,7 +39,7 @@ error: cross-crate traits with a default impl, like `Send`, should not be specia
 LL | unsafe impl<T: Send> Send for TwoParamsSame<T, T> {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this will change its meaning in a future release!
+   = warning: has potentially surprising behavior
    = note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
    = note: `T` is mentioned multiple times
 note: try using the same sequence of generic parameters as the struct definition
@@ -54,7 +54,7 @@ error: cross-crate traits with a default impl, like `Send`, should not be specia
 LL | unsafe impl<T> Send for WithPhantomDataSend<*const T, i8> {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this will change its meaning in a future release!
+   = warning: has potentially surprising behavior
    = note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
    = note: `*const T` is not a generic parameter
 note: try using the same sequence of generic parameters as the struct definition
@@ -69,7 +69,7 @@ error: cross-crate traits with a default impl, like `Sync`, should not be specia
 LL | unsafe impl<T> Sync for WithLifetime<'static, Vec<T>> {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this will change its meaning in a future release!
+   = warning: has potentially surprising behavior
    = note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
    = note: `Vec<T>` is not a generic parameter
 note: try using the same sequence of generic parameters as the struct definition

tests/ui/auto-traits/suspicious-negative-impls-lint.rs

@@ -6,16 +6,16 @@ use std::marker::PhantomData;
 struct ContainsVec<T>(Vec<T>);
 impl !Send for ContainsVec<u32> {}
 //~^ ERROR
-//~| WARNING this will change its meaning
+//~| WARNING has potentially surprising behavior
 
 pub struct WithPhantomDataSend<T, U>(PhantomData<T>, U);
 impl<T> !Send for WithPhantomDataSend<*const T, u8> {}
 //~^ ERROR
-//~| WARNING this will change its meaning
+//~| WARNING has potentially surprising behavior
 
 pub struct WithLifetime<'a, T>(&'a (), T);
 impl<T> !Sync for WithLifetime<'static, Option<T>> {}
 //~^ ERROR
-//~| WARNING this will change its meaning
+//~| WARNING has potentially surprising behavior
 
 fn main() {}

tests/ui/auto-traits/suspicious-negative-impls-lint.stderr

@@ -4,7 +4,7 @@ error: cross-crate traits with a default impl, like `Send`, should not be specia
 LL | impl !Send for ContainsVec<u32> {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this will change its meaning in a future release!
+   = warning: has potentially surprising behavior
    = note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
    = note: `u32` is not a generic parameter
 note: try using the same sequence of generic parameters as the struct definition
@@ -24,7 +24,7 @@ error: cross-crate traits with a default impl, like `Send`, should not be specia
 LL | impl<T> !Send for WithPhantomDataSend<*const T, u8> {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this will change its meaning in a future release!
+   = warning: has potentially surprising behavior
    = note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
    = note: `*const T` is not a generic parameter
 note: try using the same sequence of generic parameters as the struct definition
@@ -39,7 +39,7 @@ error: cross-crate traits with a default impl, like `Sync`, should not be specia
 LL | impl<T> !Sync for WithLifetime<'static, Option<T>> {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this will change its meaning in a future release!
+   = warning: has potentially surprising behavior
    = note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
    = note: `Option<T>` is not a generic parameter
 note: try using the same sequence of generic parameters as the struct definition

tests/ui/coherence/coherence-conflicting-negative-trait-impl.rs

@@ -14,6 +14,6 @@ unsafe impl<T: 'static> Send for TestType<T> {} //~ ERROR conflicting implementa
 
 impl !Send for TestType<i32> {}
 //~^ WARNING
-//~| WARNING this will change its meaning
+//~| WARNING has potentially surprising behavior
 
 fn main() {}

tests/ui/coherence/coherence-conflicting-negative-trait-impl.stderr

@@ -22,7 +22,7 @@ warning: cross-crate traits with a default impl, like `Send`, should not be spec
 LL | impl !Send for TestType<i32> {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this will change its meaning in a future release!
+   = warning: has potentially surprising behavior
    = note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
    = note: `i32` is not a generic parameter
 note: try using the same sequence of generic parameters as the struct definition

tests/ui/coherence/coherence-orphan.rs

@@ -7,18 +7,18 @@ use lib::TheTrait;
 
 struct TheType;
 
-impl TheTrait<usize> for isize { }
+impl TheTrait<usize> for isize {}
 //~^ ERROR E0117
 //~| ERROR not all trait items implemented
 
-impl TheTrait<TheType> for isize { }
+impl TheTrait<TheType> for isize {}
 //~^ ERROR not all trait items implemented
 
-impl TheTrait<isize> for TheType { }
+impl TheTrait<isize> for TheType {}
 //~^ ERROR not all trait items implemented
 
-impl !Send for Vec<isize> { } //~ ERROR E0117
+impl !Send for Vec<isize> {} //~ ERROR E0117
 //~^ WARNING
-//~| WARNING this will change its meaning
+//~| WARNING has potentially surprising behavior
 
-fn main() { }
+fn main() {}

tests/ui/coherence/coherence-orphan.stderr

@@ -1,7 +1,7 @@
 error[E0117]: only traits defined in the current crate can be implemented for primitive types
   --> $DIR/coherence-orphan.rs:10:1
    |
-LL | impl TheTrait<usize> for isize { }
+LL | impl TheTrait<usize> for isize {}
    | ^^^^^---------------^^^^^-----
    | |    |                   |
    | |    |                   `isize` is not defined in the current crate
@@ -13,7 +13,7 @@ LL | impl TheTrait<usize> for isize { }
 error[E0117]: only traits defined in the current crate can be implemented for types defined outside of the crate
   --> $DIR/coherence-orphan.rs:20:1
    |
-LL | impl !Send for Vec<isize> { }
+LL | impl !Send for Vec<isize> {}
    | ^^^^^^^^^^^^^^^----------
    | |              |
    | |              `Vec` is not defined in the current crate
@@ -24,10 +24,10 @@ LL | impl !Send for Vec<isize> { }
 warning: cross-crate traits with a default impl, like `Send`, should not be specialized
   --> $DIR/coherence-orphan.rs:20:1
    |
-LL | impl !Send for Vec<isize> { }
+LL | impl !Send for Vec<isize> {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this will change its meaning in a future release!
+   = warning: has potentially surprising behavior
    = note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
    = note: `isize` is not a generic parameter
 note: try using the same sequence of generic parameters as the struct definition
@@ -37,23 +37,23 @@ note: try using the same sequence of generic parameters as the struct definition
 error[E0046]: not all trait items implemented, missing: `the_fn`
   --> $DIR/coherence-orphan.rs:10:1
    |
-LL | impl TheTrait<usize> for isize { }
+LL | impl TheTrait<usize> for isize {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `the_fn` in implementation
    |
    = help: implement the missing item: `fn the_fn(&self) { todo!() }`
 
 error[E0046]: not all trait items implemented, missing: `the_fn`
   --> $DIR/coherence-orphan.rs:14:1
    |
-LL | impl TheTrait<TheType> for isize { }
+LL | impl TheTrait<TheType> for isize {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `the_fn` in implementation
    |
    = help: implement the missing item: `fn the_fn(&self) { todo!() }`
 
 error[E0046]: not all trait items implemented, missing: `the_fn`
   --> $DIR/coherence-orphan.rs:17:1
    |
-LL | impl TheTrait<isize> for TheType { }
+LL | impl TheTrait<isize> for TheType {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `the_fn` in implementation
    |
    = help: implement the missing item: `fn the_fn(&self) { todo!() }`

tests/ui/issues/issue-106755.rs

@@ -16,6 +16,6 @@ unsafe impl<T: 'static> Send for TestType<T> {} //~ ERROR conflicting implementa
 
 impl !Send for TestType<i32> {}
 //~^ WARNING
-//~| WARNING this will change its meaning
+//~| WARNING has potentially surprising behavior
 
 fn main() {}

tests/ui/issues/issue-106755.stderr

@@ -22,7 +22,7 @@ warning: cross-crate traits with a default impl, like `Send`, should not be spec
 LL | impl !Send for TestType<i32> {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this will change its meaning in a future release!
+   = warning: has potentially surprising behavior
    = note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
    = note: `i32` is not a generic parameter
 note: try using the same sequence of generic parameters as the struct definition