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error[E0282]: type annotations needed
--> $DIR/issue-23041.rs:6:7
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LL | b.downcast_ref::<fn(_)->_>();
| ^^^^^^^^^^^^ cannot infer type of the type parameter `T` declared on the method `downcast_ref`
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help: consider specifying the generic argument
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LL - b.downcast_ref::<fn(_)->_>();
LL + b.downcast_ref::<fn(_) -> _>();
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error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0282`.
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