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error[E0308]: mismatched types
--> $DIR/retslot-cast.rs:13:5
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LL | -> Option<&Iterator<Item=()>> {
| -------------------------- expected `Option<&dyn Iterator<Item = ()>>` because of return type
...
LL | inner(x)
| ^^^^^^^^ expected trait `Iterator<Item = ()>`, found trait `Iterator<Item = ()> + Send`
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= note: expected enum `Option<&dyn Iterator<Item = ()>>`
found enum `Option<&dyn Iterator<Item = ()> + Send>`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.
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