error[E0106]: missing lifetime specifier --> $DIR/rfc1623-3.rs:8:42 | LL | static NON_ELIDABLE_FN: &fn(&u8, &u8) -> &u8 = | --- --- ^ expected named lifetime parameter | = help: this function's return type contains a borrowed value, but the signature does not say whether it is borrowed from argument 1 or argument 2 = note: for more information on higher-ranked polymorphism, visit https://doc.rust-lang.org/nomicon/hrtb.html help: consider making the type lifetime-generic with a new `'a` lifetime | LL | static NON_ELIDABLE_FN: &for<'a> fn(&'a u8, &'a u8) -> &'a u8 = | +++++++ ++ ++ ++ error[E0106]: missing lifetime specifier --> $DIR/rfc1623-3.rs:10:39 | LL | &(non_elidable as fn(&u8, &u8) -> &u8); | --- --- ^ expected named lifetime parameter | = help: this function's return type contains a borrowed value, but the signature does not say whether it is borrowed from argument 1 or argument 2 help: consider making the type lifetime-generic with a new `'a` lifetime | LL | &(non_elidable as for<'a> fn(&'a u8, &'a u8) -> &'a u8); | +++++++ ++ ++ ++ error[E0605]: non-primitive cast: `for<'a, 'b> fn(&'a u8, &'b u8) -> &'a u8 {non_elidable}` as `for<'a, 'b> fn(&'a u8, &'b u8) -> &u8` --> $DIR/rfc1623-3.rs:10:6 | LL | &(non_elidable as fn(&u8, &u8) -> &u8); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ invalid cast error: aborting due to 3 previous errors Some errors have detailed explanations: E0106, E0605. For more information about an error, try `rustc --explain E0106`.