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error[E0119]: conflicting implementations of trait `Trait1<Box<_>>` for type `A`
--> $DIR/issue-43355.rs:13:1
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LL | impl<X, T> Trait1<X> for T where T: Trait2<X> {
| --------------------------------------------- first implementation here
...
LL | impl<X> Trait1<Box<X>> for A {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `A`
|
= note: downstream crates may implement trait `Trait2<std::boxed::Box<_>>` for type `A`
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0119`.
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