Attribute Macro batch_impl_only 

#[batch_impl_only]

Same as #[batch_impl], but discards the annotated trait definition and only emits impl blocks.

For traits already defined elsewhere where only batched impl generation is needed. The annotated trait merely serves as the “signature source of truth” for the directive system: #name/#fill/#delegate read item signatures from it, and the open extension #name(args){body} hands (method name list, body, the whole trait) to the user’s same-named function-like macro (see README “Directive System”). The syntax is identical to #[batch_impl].

Examples

trait Greet { fn hello(&self) -> &str; }

#[batch_impl_only(usize #hello{"hi"})]
trait Greet { fn hello(&self) -> &str; } // this trait definition is dropped, existing definitions are unaffected
// Written with batch_impl_only instead of batch_trait to use the directive system; write it verbatim at the trait definition site