types: add proper Function support

src/types.rs

@@ -37,6 +37,7 @@ impl_from!(Number, i32);
 impl_from!(String, String);
 impl_from!(String, &str);
 impl_from!(Table, Table);
+impl_from!(Function, Function);
 
 pub type Value = Option<ValueInner>;
 
@@ -79,7 +80,7 @@ impl Table {
 
 #[derive(Clone)]
 pub struct Function {
-	name: &'static str,
+	name: String,
 	inner: Rc<dyn Fn(&[Value]) -> Value>,
 }
 
@@ -104,6 +105,12 @@ impl Hash for Function {
 }
 
 impl Function {
+	pub fn new(name: Option<String>, f: impl Fn(&[Value]) -> Value + 'static) -> Self {
+		let inner = Rc::new(f);
+		let name = name.unwrap_or_else(|| format!("function {:?}", inner.as_ref() as *const _));
+		Self { name, inner }
+	}
+
 	pub fn call(&self, args: &[Value]) -> Value {
 		(self.inner)(args)
 	}