1 warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
2 --> $DIR/issue-39448.rs:1:12
4 LL | #![feature(specialization)]
7 = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
8 = help: consider using `min_specialization` instead, which is more stable and complete
9 = note: `#[warn(incomplete_features)]` on by default
11 error[E0275]: overflow evaluating the requirement `T: FromA<U>`
12 --> $DIR/issue-39448.rs:45:13
14 LL | x.foo(y.to()).to()
17 note: required for `T` to implement `FromA<U>`
18 --> $DIR/issue-39448.rs:24:29
20 LL | impl<T: A, U: A + FromA<T>> FromA<T> for U {
23 | unsatisfied trait bound introduced here
24 note: required for `U` to implement `ToA<T>`
25 --> $DIR/issue-39448.rs:34:12
27 LL | impl<T, U> ToA<U> for T
31 | -------- unsatisfied trait bound introduced here
33 error: aborting due to previous error; 1 warning emitted
35 For more information about this error, try `rustc --explain E0275`.