Allow unreachable_code lint in command! macro

If a user returns at the end of a `command!` macro block, the library's return
value will never be processed, as it's unreachable. Instead of warning for this,
allow it.

src/ext/framework/mod.rs

@@ -117,31 +117,31 @@ use ::model::Channel;
 #[macro_export]
 macro_rules! command {
     ($fname:ident($c:ident) $b:block) => {
-        #[allow(unused_mut)]
+        #[allow(unreachable_code, unused_mut)]
         pub fn $fname(mut $c: &mut $crate::client::Context, _: &$crate::model::Message, _: Vec<String>) -> ::std::result::Result<(), String> {
             $b
 
             Ok(())
         }
     };
     ($fname:ident($c:ident, $m:ident) $b:block) => {
-        #[allow(unused_mut)]
+        #[allow(unreachable_code, unused_mut)]
         pub fn $fname(mut $c: &mut $crate::client::Context, $m: &$crate::model::Message, _: Vec<String>) -> ::std::result::Result<(), String> {
             $b
 
             Ok(())
         }
     };
     ($fname:ident($c:ident, $m:ident, $a:ident) $b:block) => {
-        #[allow(unused_mut)]
+        #[allow(unreachable_code, unused_mut)]
         pub fn $fname(mut $c: &mut $crate::client::Context, $m: &$crate::model::Message, $a: Vec<String>) -> ::std::result::Result<(), String> {
             $b
 
             Ok(())
         }
     };
     ($fname:ident($c:ident, $m:ident, $a:ident, $($name:ident: $t:ty),*) $b:block) => {
-        #[allow(unreachable_patterns, unused_mut)]
+        #[allow(unreachable_code, unreachable_patterns, unused_mut)]
         pub fn $fname(mut $c: &mut $crate::client::Context, $m: &$crate::model::Message, $a: Vec<String>) -> ::std::result::Result<(), String> {
             let mut i = $a.iter();
             let mut arg_counter = 0;