rust/tests/ui/derives/derive-on-trait-item-or-impl-item.rs

trait Foo {
    #[derive(Clone)]
    //~^ ERROR `derive` may only be applied to `struct`s, `enum`s and `union`s
    type Bar;
}

struct Bar;

impl Bar {
    #[derive(Clone)]
    //~^ ERROR `derive` may only be applied to `struct`s, `enum`s and `union`s
    fn bar(&self) {}
}

fn main() {}
Do not expand a derive invocation when derive is not allowed 1. Change the return type of `expand_invoc()` and its subroutines to `Option<Expansion>` from `Expansion`. 2. Return `None` when expanding a derive invocation if the item cannot have derive on it (in `expand_derive_invoc()`). 2017-12-26 07:47:32 +00:00			`trait Foo {`
			`#[derive(Clone)]`
Various diagnostics clean ups/tweaks * Always point at macros, including derive macros * Point at non-local items that introduce a trait requirement * On private associated item, point at definition 2021-07-17 18:13:50 +00:00			//~^ ERROR `derive` may only be applied to `struct`s, `enum`s and `union`s
Do not expand a derive invocation when derive is not allowed 1. Change the return type of `expand_invoc()` and its subroutines to `Option<Expansion>` from `Expansion`. 2. Return `None` when expanding a derive invocation if the item cannot have derive on it (in `expand_derive_invoc()`). 2017-12-26 07:47:32 +00:00			`type Bar;`
			`}`

Do not abort compilation if expansion produces errors Fix a number of uncovered deficiencies in diagnostics 2018-12-16 17:23:27 +00:00			`struct Bar;`

Do not expand a derive invocation when derive is not allowed 1. Change the return type of `expand_invoc()` and its subroutines to `Option<Expansion>` from `Expansion`. 2. Return `None` when expanding a derive invocation if the item cannot have derive on it (in `expand_derive_invoc()`). 2017-12-26 07:47:32 +00:00			`impl Bar {`
			`#[derive(Clone)]`
Various diagnostics clean ups/tweaks * Always point at macros, including derive macros * Point at non-local items that introduce a trait requirement * On private associated item, point at definition 2021-07-17 18:13:50 +00:00			//~^ ERROR `derive` may only be applied to `struct`s, `enum`s and `union`s
Do not expand a derive invocation when derive is not allowed 1. Change the return type of `expand_invoc()` and its subroutines to `Option<Expansion>` from `Expansion`. 2. Return `None` when expanding a derive invocation if the item cannot have derive on it (in `expand_derive_invoc()`). 2017-12-26 07:47:32 +00:00			`fn bar(&self) {}`
			`}`

			`fn main() {}`