use trait aliases

src/lib.rs

@@ -1,3 +1,5 @@
+#![feature(trait_alias)]
+
 pub mod types;
 
 use crate::types::Message;
@@ -10,10 +12,12 @@ use std::{
     time::{SystemTime, UNIX_EPOCH},
 };
 
+pub trait Handler = Fn(Message, Rc<Malestorm>) -> Result<(), String> + 'static;
+
 pub struct Malestorm<'a> {
     node: RefCell<Node>,
     io: MalestormIo,
-    pub handlers: HashMap<&'a str, Box<dyn Fn(Message, Rc<Malestorm>) -> Result<(), String>>>,
+    pub handlers: HashMap<&'a str, Box<dyn Handler>>,
 }
 
 struct Node {
@@ -130,11 +134,7 @@ impl<'a> Malestorm<'a> {
         format!("{}_{}", s1, s2)
     }
 
-    pub fn register(
+    pub fn register(&mut self, name: &'a str, func: impl Handler) {
-        &mut self,
-        name: &'a str,
-        func: impl Fn(Message, Rc<Malestorm>) -> Result<(), String> + 'a + 'static,
-    ) {
         self.handlers.insert(name, Box::new(func));
     }