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error[E0282]: type annotations needed
--> $DIR/issue-42234-unknown-receiver-type.rs:9:24
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LL | let x: Option<_> = None;
| ^^^^ cannot infer type of the type parameter `T` declared on the enum `Option`
LL | x.unwrap().method_that_could_exist_on_some_type();
| ---------- type must be known at this point
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help: consider specifying the generic argument
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LL | let x: Option<_> = None::<T>;
| +++++
error[E0282]: type annotations needed
--> $DIR/issue-42234-unknown-receiver-type.rs:15:10
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LL | .sum::<_>()
| ^^^ cannot infer type of the type parameter `S` declared on the associated function `sum`
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help: consider specifying the generic argument
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LL | .sum::<_>()
| ~~~~~
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0282`.
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