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error[E0284]: type annotations needed
--> $DIR/issue-91762.rs:24:15
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LL | ret = <Self::Base as Functor>::fmap(arg);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type of the type parameter `T` declared on the associated function `fmap`
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= note: cannot satisfy `<<Self as FunctorExt<T>>::Base as Functor>::With<_> == Self`
help: consider specifying the generic arguments
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LL | ret = <Self::Base as Functor>::fmap::<T, U>(arg);
| ++++++++
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0284`.
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