Add missing muts

src/lib.rs

@@ -52,7 +52,7 @@ macro_rules! args_to_pat {
     ( ( $name:ident : $ty:ty , $($tok:tt)* ) ) => {
         ( $name, args_to_pat!( ( $($tok)* ) ) )
     };
-    ( ( $name:ident : $ty:ty , $($tok:tt)* ) ) => {
+    ( ( mut $name:ident : $ty:ty , $($tok:tt)* ) ) => {
         ( mut $name, args_to_pat!( ( $($tok)* ) ) )
     };
 }
@@ -68,7 +68,7 @@ macro_rules! args_to_join {
     ( ( $name:ident : $ty:ty , $($tok:tt)* ) ) => {
         ( & $name, args_to_join!( ( $($tok)* ) ) )
     };
-    ( ( $name:ident : $ty:ty , $($tok:tt)* ) ) => {
+    ( ( mut $name:ident : $ty:ty , $($tok:tt)* ) ) => {
         ( &mut $name, args_to_join!( ( $($tok)* ) ) )
     };
 }