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error[E0308]: `?` operator has incompatible types
--> $DIR/remove-question-symbol-with-paren.rs:5:6
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LL | fn foo() -> Option<()> {
| ---------- expected `Option<()>` because of return type
LL | let x = Some(());
LL | (x?)
| ^^ expected `Option<()>`, found `()`
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= note: `?` operator cannot convert from `()` to `Option<()>`
= note: expected enum `Option<()>`
found unit type `()`
help: try removing this `?`
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LL - (x?)
LL + (x)
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help: try wrapping the expression in `Some`
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LL | (Some(x?))
| +++++ +
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0308`.
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