error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in variable bindings --> $DIR/issue-87295.rs:16:31 | LL | let _do_not_waste: Struct> = Struct::new(()); | ^^^^^^^^^^^^^^^^^^^^^^^^ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0562`.