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warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
--> $DIR/issue-39448.rs:1:12
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LL | #![feature(specialization)]
| ^^^^^^^^^^^^^^
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= 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[E0391]: cycle detected when computing whether impls specialize one another
--> $DIR/issue-39448.rs:24:1
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LL | impl<T: A, U: A + FromA<T>> FromA<T> for U {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: ...which requires evaluating trait selection obligation `u16: FromA<u8>`...
= note: ...which again requires computing whether impls specialize one another, completing the cycle
note: cycle used when building specialization graph of trait `FromA`
--> $DIR/issue-39448.rs:20:1
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LL | trait FromA<T> {
| ^^^^^^^^^^^^^^
= note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
error: aborting due to 1 previous error; 1 warning emitted
For more information about this error, try `rustc --explain E0391`.
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