error: overly complex generic constant --> $DIR/issue-77357.rs:6:46 | LL | fn bug<'a, T>() -> &'static dyn MyTrait<[(); { |x: &'a u32| { x }; 4 }]> { | ^^^^^^^^^^^^^^^^^^^^^^^^^ blocks are not supported in generic constant | = help: consider moving this anonymous constant into a `const` function = note: this operation may be supported in the future error: aborting due to previous error