fn f() {}
static m : HashMap<&str, fn()> = {
let mut t = HashMap::new();
t.insert("p", f as f());
t
};
However you will then run into trouble that HashMap cannot be created at compile time. To fix this, use lazy_static.
use std::collections::HashMap;
use lazy_static::lazy_static;
fn f() {}
lazy_static! {
static ref MAP: HashMap<&'static str, fn()> = {
let mut t = HashMap::new();
t.insert("p", f as fn());
t
};
}