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error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change
--> $DIR/issue-23024.rs:8:39
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LL | println!("{:?}",(vfnfer[0] as dyn Fn)(3));
| ^^ help: use parenthetical notation instead: `Fn() -> ()`
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= note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
= help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
error[E0107]: missing generics for trait `Fn`
--> $DIR/issue-23024.rs:8:39
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LL | println!("{:?}",(vfnfer[0] as dyn Fn)(3));
| ^^ expected 1 generic argument
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help: add missing generic argument
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LL | println!("{:?}",(vfnfer[0] as dyn Fn<Args>)(3));
| ++++++
error[E0191]: the value of the associated type `Output` (from trait `FnOnce`) must be specified
--> $DIR/issue-23024.rs:8:39
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LL | println!("{:?}",(vfnfer[0] as dyn Fn)(3));
| ^^ help: specify the associated type: `Fn<Output = Type>`
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0107, E0191, E0658.
For more information about an error, try `rustc --explain E0107`.
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