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error[E0658]: parenthetical notation is only stable when used with `Fn`-family traits
--> $DIR/unboxed-closure-feature-gate.rs:13:20
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LL | let x: Box<dyn Foo(isize)>;
| ^^^^^^^^^^
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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: aborting due to previous error
For more information about this error, try `rustc --explain E0658`.
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