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error[E0391]: cycle detected when computing the bounds for type parameter `T`
--> $DIR/issue-21177.rs:6:21
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LL | fn foo<T: Trait<A = T::B>>() { }
| ^^^^
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= note: ...which immediately requires computing the bounds for type parameter `T` again
note: cycle used when computing explicit predicates of `foo`
--> $DIR/issue-21177.rs:6:21
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LL | fn foo<T: Trait<A = T::B>>() { }
| ^^^^
= 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 previous error
For more information about this error, try `rustc --explain E0391`.
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