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error[E0310]: the parameter type `E` may not live long enough
--> $DIR/unconstrained-closure-lifetime-trait-object.rs:7:29
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LL | Box::new(|e| Box::new(e.is::<E>()))
| ^^
| |
| the parameter type `E` must be valid for the static lifetime...
| ...so that the type `E` will meet its required lifetime bounds
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help: consider adding an explicit lifetime bound
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LL | fn foo<E: 'static>() -> B {
| +++++++++
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0310`.
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