Document why we re-direct to a derive macro (#117)

daxpedda · web-flow · commit b383ea0b349b · 2025-05-17T15:45:31.000+02:00
diff --git a/src/lib.rs b/src/lib.rs
@@ -568,6 +568,9 @@ fn derive_where_internal(mut item: DeriveInput) -> Result<TokenStream> {
 	Ok(output)
 }
 
+/// Internally we re-direct the attribute macro to the derive macro. Unlike the
+/// attribute macro, the derive macro supports helper attributes and evaluates
+/// `cfg`s.
 #[doc(hidden)]
 #[proc_macro_derive(DeriveWhere, attributes(derive_where))]
 #[cfg_attr(feature = "nightly", allow_internal_unstable(core_intrinsics))]

Original file line number	Diff line number	Diff line change
`@@ -568,6 +568,9 @@ fn derive_where_internal(mut item: DeriveInput) -> Result<TokenStream> {`
`568`	`568`	`Ok(output)`
`569`	`569`	`}`
`570`	`570`
	`571`	`+/// Internally we re-direct the attribute macro to the derive macro. Unlike the`
	`572`	`+/// attribute macro, the derive macro supports helper attributes and evaluates`
	`573`	+/// `cfg`s.
`571`	`574`	`#[doc(hidden)]`
`572`	`575`	`#[proc_macro_derive(DeriveWhere, attributes(derive_where))]`
`573`	`576`	`#[cfg_attr(feature = "nightly", allow_internal_unstable(core_intrinsics))]`