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error[E0658]: cannot cast `dyn Fn()` to `dyn FnMut()`, trait upcasting coercion is experimental
--> $DIR/issue-11515.rs:9:38
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LL | let test = Box::new(Test { func: closure });
| ^^^^^^^
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= note: see issue #65991 <https://github.com/rust-lang/rust/issues/65991> for more information
= help: add `#![feature(trait_upcasting)]` to the crate attributes to enable
= note: required when coercing `Box<(dyn Fn() + 'static)>` into `Box<(dyn FnMut() + 'static)>`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0658`.
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