Introducing Rust Language Server(internals.rust-lang.org)

    error[E0281]: type mismatch: the type `fn(_) -> _ {tool::second::<_>}` implements the trait `std::ops::FnMut<(_,)>`, but the trait `for<'r> std::ops::FnMut<(&'r _,)>` is required (expected concrete lifetime, found bound lifetime parameter )

     --> src\lib.rs:53:11
       |
    53 |            .filter(apply(second, i))
       |                    ^^^^^
       |
       = note: required by `apply`

    error[E0271]: type mismatch resolving `for<'r> <fn(_) -> _ {tool::second::<_>} as std::ops::FnOnce<(&'r _,)>>::Output == _`
      --> src\lib.rs:53:11
       |
    53 |            .filter(apply(second, i))
       |                    ^^^^^ expected bound lifetime parameter , found concrete lifetime
       |
       = note: concrete lifetime that was found is lifetime '_#11r
       = note: required by `apply`

    error: aborting due to 2 previous errors

    fn accumulate<'a, T: Monoid>(tuples: &[(&'a str, &Fn(i32) -> bool)], i: i32) -> Option<T>
        where T: From<&'a str>