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better error message on failed derive (#1491)

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Before, when deriving `SystemLabel` for a type without `Clone`, the error message was:
```
the trait `SystemLabel` is not implemented for `&TransformSystem`
```
Now it is
```
the trait `Clone` is not implemented for `TransformSystem`
```
which directly shows what's needed to fix the problem.
This commit is contained in:
Jakob Hellermann 2021-02-22 03:23:57 +00:00
parent 3319195f90
commit f73c6d18ef
1 changed files with 1 additions and 1 deletions
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2
crates/bevy_ecs/macros/src/lib.rs
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@ -503,7 +503,7 @@ fn derive_label(input: DeriveInput, label_type: Ident) -> TokenStream2 {
quote! { quote! {
impl #crate_path::#label_type for #ident { impl #crate_path::#label_type for #ident {
fn dyn_clone(&self) -> Box<dyn #crate_path::#label_type> { fn dyn_clone(&self) -> Box<dyn #crate_path::#label_type> {
Box::new(self.clone()) Box::new(Clone::clone(self))
} }
} }
} }