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error[E0391]: cycle detected when computing type of `Foo::X`
--> $DIR/cycle-trait-default-type-trait.rs:4:23
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LL | trait Foo<X = Box<dyn Foo>> {
| ^^^
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= note: ...which immediately requires computing type of `Foo::X` again
note: cycle used when checking that `Foo` is well-formed
--> $DIR/cycle-trait-default-type-trait.rs:4:1
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LL | trait Foo<X = Box<dyn 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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