File: hof.rs

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#![feature(never_type)]

pub struct First<T>(T);
pub struct Second<T>(T);
pub struct Third<T>(T);

pub fn fn_ptr(_: fn (First<u32>) -> !, _: bool) {}
pub fn fn_once(_: impl FnOnce (Second<u32>) -> !, _: u8) {}
pub fn fn_mut(_: impl FnMut (Third<u32>) -> !, _: i8) {}
pub fn fn_(_: impl Fn (u32) -> !, _: char) {}

pub fn multiple(_: impl Fn(&'static str, &'static str) -> i8) {}