mirror of https://github.com/rust-lang/rust
29 lines
1.3 KiB
Plaintext
29 lines
1.3 KiB
Plaintext
error[E0507]: cannot move out of `*cb` which is behind a mutable reference
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--> $DIR/suggest-as-ref-on-mut-closure.rs:7:5
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LL | cb.map(|cb| cb());
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| ^^ -------------- `*cb` moved due to this method call
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| help: consider calling `.as_ref()` or `.as_mut()` to borrow the type's contents
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| move occurs because `*cb` has type `Option<&mut dyn FnMut()>`, which does not implement the `Copy` trait
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note: `Option::<T>::map` takes ownership of the receiver `self`, which moves `*cb`
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--> $SRC_DIR/core/src/option.rs:LL:COL
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help: you could `clone` the value and consume it, if the `&mut dyn FnMut(): Clone` trait bound could be satisfied
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LL | <Option<&mut dyn FnMut()> as Clone>::clone(&cb).map(|cb| cb());
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| ++++++++++++++++++++++++++++++++++++++++++++ +
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error[E0596]: cannot borrow `*cb` as mutable, as it is behind a `&` reference
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--> $DIR/suggest-as-ref-on-mut-closure.rs:12:26
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LL | cb.as_ref().map(|cb| cb());
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| -- ^^ `cb` is a `&` reference, so the data it refers to cannot be borrowed as mutable
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| consider changing this binding's type to be: `&mut &mut dyn FnMut()`
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error: aborting due to 2 previous errors
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Some errors have detailed explanations: E0507, E0596.
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For more information about an error, try `rustc --explain E0507`.
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