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+error: inherent impls cannot be `default`
+ --> $DIR/validation.rs:7:14
+ |
+LL | default impl S {}
+ | ------- ^ inherent impl for this type
+ | |
+ | `default` because of this
+ |
+ = note: only trait implementations may be annotated with `default`
+
+warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
+ --> $DIR/validation.rs:2:12
+ |
+LL | #![feature(specialization)]
+ | ^^^^^^^^^^^^^^
+ |
+ = note: `#[warn(incomplete_features)]` on by default
+ = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
+ = help: consider using `min_specialization` instead, which is more stable and complete
+
+error: impls of auto traits cannot be default
+ --> $DIR/validation.rs:9:21
+ |
+LL | default unsafe impl Send for S {}
+ | ------- ^^^^ auto trait
+ | |
+ | default because of this
+
+error: impls of auto traits cannot be default
+ --> $DIR/validation.rs:10:15
+ |
+LL | default impl !Send for Z {}
+ | ------- ^^^^ auto trait
+ | |
+ | default because of this
+
+error[E0750]: negative impls cannot be default impls
+ --> $DIR/validation.rs:10:1
+ |
+LL | default impl !Send for Z {}
+ | ^^^^^^^ ^
+
+error[E0750]: negative impls cannot be default impls
+ --> $DIR/validation.rs:14:1
+ |
+LL | default impl !Tr for S {}
+ | ^^^^^^^ ^
+
+error: aborting due to 5 previous errors; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0750`.