Function tlua::function1

pub fn function1<Z, R, A>(f: Z) -> Function<Z, (A,), R>
where
    Z: FnMut(A) -> R,

Wraps a type that implements FnMut so that it can be used by tlua.

This is needed because of a limitation in Rust’s inferrence system. Even though in practice functions and closures always have a fixed number of parameters, the FnMut trait of Rust was designed so that it allows calling the same closure with a varying number of parameters. The consequence however is that there is no way of inferring with the trait alone many parameters a function or closure expects.