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+warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
+ --> $DIR/specialization-unconstrained.rs:3:12
+ |
+LL | #![feature(specialization)]
+ | ^^^^^^^^^^^^^^
+ |
+ = 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
+ = note: `#[warn(incomplete_features)]` on by default
+
+error[E0284]: type annotations needed: cannot satisfy `<u32 as Default>::Id == ()`
+ --> $DIR/specialization-unconstrained.rs:20:5
+ |
+LL | test::<u32, ()>();
+ | ^^^^^^^^^^^^^^^ cannot satisfy `<u32 as Default>::Id == ()`
+ |
+note: required by a bound in `test`
+ --> $DIR/specialization-unconstrained.rs:17:20
+ |
+LL | fn test<T: Default<Id = U>, U>() {}
+ | ^^^^^^ required by this bound in `test`
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0284`.