error[E0275]: overflow evaluating the requirement `T: Trait<_>` | = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`issue_45814`) note: required for `T` to implement `Trait<_>` --> $DIR/issue-45814.rs:9:20 | LL | default impl Trait for U {} | ^^^^^^^^ ^ = note: 128 redundant requirements hidden = note: required for `T` to implement `Trait<_>` error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0275`.