Fixed SystemBuilder requiring that all resource views impl Send

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "legion"
-version = "0.3.0"
+version = "0.3.1"
 description = "High performance entity component system (ECS) library"
 authors = ["Thomas Gillen <[email protected]>"]
 repository = "https://github.com/amethyst/legion"

codegen/src/lib.rs

@@ -372,8 +372,8 @@ impl Sig {
                     }
                     Type::Reference(ty) => {
                         let mutable = ty.mutability.is_some();
-                        let resource = Self::find_remove_arg_attr(&mut arg.attrs);
-                        match resource {
+                        let attribute = Self::find_remove_arg_attr(&mut arg.attrs);
+                        match attribute {
                             Some(ArgAttr::Resource) => {
                                 if mutable {
                                     parameters.push(Parameter::ResourceMut(write_resources.len()));

src/internals/systems/system.rs

@@ -288,7 +288,7 @@ impl Default for SystemBuilder<(), ()> {
 impl<Q, R> SystemBuilder<Q, R>
 where
     Q: 'static + Send + ConsFlatten,
-    R: 'static + Send + ConsFlatten,
+    R: 'static + ConsFlatten,
 {
     /// Provides a name to the system being built.
     pub fn with_name(self, name: SystemId) -> Self {

tests/systems_basic.rs

@@ -30,6 +30,26 @@ mod tests {
         Schedule::builder().add_system(basic_system()).build();
     }
 
+    #[test]
+    fn with_not_sendsync_resource() {
+        struct NotSync(*const usize);
+
+        #[system]
+        fn basic(#[resource] _: &NotSync) {}
+
+        Schedule::builder().add_thread_local(basic_system()).build();
+    }
+
+    #[test]
+    fn with_mut_not_sendsync_resource() {
+        struct NotSync(*const usize);
+
+        #[system]
+        fn basic(#[resource] _: &mut NotSync) {}
+
+        Schedule::builder().add_thread_local(basic_system()).build();
+    }
+
     #[test]
     fn with_world() {
         #[system]