At some point recently, each function was given its own, distinct type for… reasons that I don’t recall. Upshot is that you need to give the compiler a hint (note the type on functions
):
fn foo() -> isize {
1
}
fn bar() -> isize {
2
}
fn main() {
let functions: Vec<fn() -> isize> = vec![foo, bar];
println!("foo() = {}, bar() = {}", functions[0](), functions[1]());
}
You can also do this like so:
let functions = vec![foo as fn() -> isize, bar];