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error[E0308]: mismatched types
--> $DIR/issue-90213-expected-boxfuture-self-ice.rs:9:19
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LL | Self::foo(None)
| --------- ^^^^ expected struct `Box`, found enum `Option`
| |
| arguments to this function are incorrect
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= note: expected struct `Box<Option<S>>`
found enum `Option<_>`
= note: for more on the distinction between the stack and the heap, read https://doc.rust-lang.org/book/ch15-01-box.html, https://doc.rust-lang.org/rust-by-example/std/box.html, and https://doc.rust-lang.org/std/boxed/index.html
note: associated function defined here
--> $DIR/issue-90213-expected-boxfuture-self-ice.rs:7:8
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LL | fn foo(_: Box<Option<S>>) {}
| ^^^ -----------------
help: store this in the heap by calling `Box::new`
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LL | Self::foo(Box::new(None))
| +++++++++ +
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.
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