error[E0275]: overflow evaluating the requirement `fn() -> impl MyFnOnce {my_fn_2}: MyFnOnce` | = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`failed_to_resolve_instance_ice_105488`) note: required for `WrapFnOnce impl MyFnOnce {my_fn_1}>` to implement `MyFnOnce` --> $DIR/failed-to-resolve-instance-ice-105488.rs:14:37 | LL | impl D, D: MyFnOnce> MyFnOnce for WrapFnOnce { | -------- ^^^^^^^^ ^^^^^^^^^^^^^ | | | unsatisfied trait bound introduced here = note: 126 redundant requirements hidden = note: required for `WrapFnOnce impl MyFnOnce {my_fn_1}>` to implement `MyFnOnce` error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0275`.