error[E0277]: expected a `Fn(<_ as ATC<'a>>::Type)` closure, found `F` --> $DIR/issue-62529-3.rs:25:14 | LL | call(f, ()); | ---- ^ expected an `Fn(<_ as ATC<'a>>::Type)` closure, found `F` | | | required by a bound introduced by this call | = note: expected a closure with arguments `((),)` found a closure with arguments `(<_ as ATC<'a>>::Type,)` note: this is a known limitation of the trait solver that will be lifted in the future --> $DIR/issue-62529-3.rs:25:14 | LL | call(f, ()); | -----^----- | | | | | the trait solver is unable to infer the generic types that should be inferred from this argument | add turbofish arguments to this call to specify the types manually, even if it's redundant note: required by a bound in `call` --> $DIR/issue-62529-3.rs:9:36 | LL | fn call<'b, T: for<'a> ATC<'a>, F: for<'a> Fn(>::Type)>( | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `call` error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0277`.