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+error[E0658]: cannot cast `dyn Fn()` to `dyn FnMut()`, trait upcasting coercion is experimental
+ --> $DIR/issue-11515.rs:9:33
+ |
+LL | let test = box Test { func: closure };
+ | ^^^^^^^
+ |
+ = 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`.