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error: defaults for type parameters are only allowed in `struct`, `enum`, `type`, or `trait` definitions
--> $DIR/parameter-defaults.rs:10:12
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LL | const NONE<T = ()>: Option<T> = None::<T>;
| ^^^^^^
error[E0282]: type annotations needed for `Option<_>`
--> $DIR/parameter-defaults.rs:13:9
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LL | let _ = NONE;
| ^ ---- type must be known at this point
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help: consider giving this pattern a type, where the type for type parameter `T` is specified
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LL | let _: Option<T> = NONE;
| +++++++++++
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0282`.
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