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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
+ |
+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[E0275]: overflow evaluating the requirement `T: FromA<U>`
+ --> $DIR/issue-39448.rs:45:13
+ |
+LL | x.foo(y.to()).to()
+ | ^^
+ |
+note: required for `T` to implement `FromA<U>`
+ --> $DIR/issue-39448.rs:24:29
+ |
+LL | impl<T: A, U: A + FromA<T>> FromA<T> for U {
+ | -------- ^^^^^^^^ ^
+ | |
+ | unsatisfied trait bound introduced here
+note: required for `U` to implement `ToA<T>`
+ --> $DIR/issue-39448.rs:34:12
+ |
+LL | impl<T, U> ToA<U> for T
+ | ^^^^^^ ^
+LL | where
+LL | U: FromA<T>,
+ | -------- unsatisfied trait bound introduced here
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0275`.