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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: `#[warn(incomplete_features)]` on by default
= note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
error[E0275]: overflow evaluating the requirement `T: FromA<U>`
--> $DIR/issue-39448.rs:45:13
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LL | x.foo(y.to()).to()
| ^^
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= note: required because of the requirements on the impl of `FromA<U>` for `T`
= note: required because of the requirements on the impl of `ToA<T>` for `U`
error: aborting due to previous error; 1 warning emitted
For more information about this error, try `rustc --explain E0275`.
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