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error[E0382]: use of moved value: `a`
--> $DIR/issue-31287-drop-in-guard.rs:5:9
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LL | let a = Some("...".to_owned());
| - move occurs because `a` has type `Option<String>`, which does not implement the `Copy` trait
LL | let b = match a {
LL | Some(_) if { drop(a); false } => None,
| - value moved here
LL | x => x,
| ^ value used here after move
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help: consider cloning the value if the performance cost is acceptable
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LL | Some(_) if { drop(a.clone()); false } => None,
| ++++++++
error: aborting due to previous error
For more information about this error, try `rustc --explain E0382`.
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