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error[E0391]: cycle detected when finding trait impls of `Foo`
--> $DIR/unknown-lifetime-ice-119827.rs:1:1
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LL | trait Foo {
| ^^^^^^^^^
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note: ...which requires computing type of `<impl at $DIR/unknown-lifetime-ice-119827.rs:8:1: 8:26>`...
--> $DIR/unknown-lifetime-ice-119827.rs:8:1
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LL | impl Foo for Box<dyn Foo> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^
= note: ...which again requires finding trait impls of `Foo`, completing the cycle
note: cycle used when checking that `Foo` is well-formed
--> $DIR/unknown-lifetime-ice-119827.rs:1:1
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LL | trait Foo {
| ^^^^^^^^^
= 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
For more information about this error, try `rustc --explain E0391`.
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