Fix warnings

maple-core/src/callback.rs

@@ -23,7 +23,7 @@ impl<A, M, CB> Callback for Callback1<A, M, CB>
 {
     type Arg = A;
 
-    fn call(&self, arg: Self::Arg) {
+    fn call(&self, _arg: Self::Arg) {
         
     }
 }

maple-core/src/lib.rs

@@ -1,4 +1,4 @@
-#![feature(proc_macro, associated_type_defaults, never_type, unsize, specialization)]
+#![feature(associated_type_defaults, never_type, unsize, specialization)]
 
 pub mod convert;
 pub mod engine;

maple-examples/examples/simple.rs

@@ -1,7 +1,6 @@
 #![feature(proc_macro_hygiene)]
 #![allow(dead_code)]
 
-#[macro_use]
 extern crate maple;
 extern crate maple_stdweb_dom;
 

maple-macro/src/lib.rs

@@ -6,8 +6,6 @@ mod tag;
 
 #[macro_use]
 extern crate syn;
-
-#[macro_use]
 extern crate quote;
 extern crate proc_macro;
 
@@ -17,7 +15,6 @@ use quote::*;
 
 use self::node::Node;
 use self::attribute::{Attribute, AttributeValue};
-use self::tag::Tag;
 
 fn visit_attribute(ident: &Ident, attr: &Attribute, _ctx: &TypePath) -> impl ToTokens {
     let attr_name = &attr.name;

maple-macro/src/node.rs

@@ -1,6 +1,4 @@
 use syn::parse::{Parse, ParseStream, Result};
-use quote::ToTokens;
-
 use crate::tag::Tag;
 
 #[derive(Debug)]

maple-macro/src/tag.rs

@@ -14,8 +14,8 @@ impl Parse for Tag {
     fn parse(input: ParseStream) -> Result<Self> {
         let mut attrs: Vec<Attribute> = Vec::new();
         let mut children: Vec<Node> = Vec::new();
-        let mut open_path: TypePath;
-        let mut close_path: TypePath;
+        let open_path: TypePath;
+        let close_path: TypePath;
 
         // parsing opening "<"
         input.parse::<Token![<]>()?;

maple/src/lib.rs

@@ -1,4 +1,3 @@
-#[macro_use]
 extern crate maple_core;
 
 pub mod prelude {