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error[E0191]: the value of the associated types `ChildKey` (from trait `Hierarchy`), `Children` (from trait `Hierarchy`), `Value` (from trait `Hierarchy`) must be specified
--> $DIR/issue-23595-1.rs:8:58
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LL | type Value;
| ---------- `Value` defined here
LL | type ChildKey;
| ------------- `ChildKey` defined here
LL | type Children = dyn Index<Self::ChildKey, Output=dyn Hierarchy>;
| ------------- `Children` defined here ^^^^^^^^^ help: specify the associated types: `Hierarchy<Value = Type, ChildKey = Type, Children = Type>`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0191`.
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