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error[E0391]: cycle detected when computing the super traits of `T` with associated type name `Item`
--> $DIR/issue-20772.rs:1:1
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LL | trait T : Iterator<Item=Self::Item>
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: ...which immediately requires computing the super traits of `T` with associated type name `Item` again
note: cycle used when computing the super predicates of `T`
--> $DIR/issue-20772.rs:1:1
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LL | trait T : Iterator<Item=Self::Item>
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= 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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