remove derives in macros

Author: joseph-gio

crates/bevy_ecs/src/schedule/label.rs

@@ -33,8 +33,13 @@ macro_rules! stage_label {
         $(
             /// A macro-generated local `StageLabel`.
             #[allow(non_camel_case_types)]
-            #[derive($crate::schedule::StageLabel)]
             struct $name;
+
+            impl $crate::schedule::StageLabel for $name {
+                fn as_str(&self) -> &'static str {
+                    std::stringify!($name)
+                }
+            }
         )*
     }
 }
@@ -46,8 +51,13 @@ macro_rules! system_label {
         $(
             /// A macro-generated local `SystemLabel`.
             #[allow(non_camel_case_types)]
-            #[derive($crate::schedule::SystemLabel)]
             struct $name;
+
+            impl $crate::schedule::SystemLabel for $name {
+                fn as_str(&self) -> &'static str {
+                    std::stringify!($name)
+                }
+            }
         )*
     }
 }
@@ -59,8 +69,13 @@ macro_rules! ambiguity_set_label {
         $(
             /// A macro-generated local `AmbiguitySetLabel`.
             #[allow(non_camel_case_types)]
-            #[derive($crate::schedule::AmbiguitySetLabel)]
             struct $name;
+
+            impl $crate::schedule::AmbiguitySetLabel for $name {
+                fn as_str(&self) -> &'static str {
+                    std::stringify!($name)
+                }
+            }
         )*
     }
 }
@@ -72,8 +87,13 @@ macro_rules! run_criteria_label {
         $(
             /// A macro-generated local `RunCriteria`.
             #[allow(non_camel_case_types)]
-            #[derive($crate::schedule::RunCriteriaLabel)]
             struct $name;
+
+            impl $crate::schedule::RunCriteriaLabel for $name {
+                fn as_str(&self) -> &'static str {
+                    std::stringify!($name)
+                }
+            }
         )*
     }
 }