Attribute proc-macro follow up

CHANGELOG.md

@@ -8,6 +8,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - Support [`ZeroizeOnDrop`](https://docs.rs/zeroize/1.5.0/zeroize/trait.ZeroizeOnDrop.html).
 
+### Changed
+- **Breaking Change**: Changed to attribute instead of derive proc macro.
+
 ### Removed
 - **Breaking Change**: Remove support for `Zeroize(drop)`.
 

README.md

@@ -23,6 +23,15 @@ This will generate trait implementations for `Example` for any `T`,
 as opposed to std's derives, which would only implement these traits with
 `T: Trait` bound to the corresponding trait.
 
+Multiple `derive_where` attributes can be added to an item, but only the
+first one must use any path qualifications.
+
+```rust
+#[derive_where::derive_where(Clone)]
+#[derive_where(Debug)]
+struct Example1<T>(PhantomData<T>);
+```
+
 In addition, the following convenience options are available:
 
 ### Generic type bounds

non-msrv-tests/tests/ui/non_item.rs

@@ -0,0 +1,6 @@
+use derive_where::derive_where;
+
+#[derive_where(Clone)]
+const _: () = ();
+
+fn main() {}

non-msrv-tests/tests/ui/non_item.stderr

@@ -0,0 +1,5 @@
+error: expected one of: `struct`, `enum`, `union`
+ --> tests/ui/non_item.rs:4:1
+  |
+4 | const _: () = ();
+  | ^^^^^

src/lib.rs

@@ -25,6 +25,16 @@
 //! as opposed to std's derives, which would only implement these traits with
 //! `T: Trait` bound to the corresponding trait.
 //!
+//! Multiple `derive_where` attributes can be added to an item, but only the
+//! first one must use any path qualifications.
+//!
+//! ```
+//! # use std::marker::PhantomData;
+//! #[derive_where::derive_where(Clone)]
+//! #[derive_where(Debug)]
+//! struct Example1<T>(PhantomData<T>);
+//! ```
+//!
 //! In addition, the following convenience options are available:
 //!
 //! ## Generic type bounds