Macro batch_impl_blanket 

batch_impl_blanket!() { /* proc-macro */ }

Documentation placeholder for the #blanket directive.

#blanket(args){wrapper list} implements the trait for every wrapper around a fresh generic T, delegating each method by deref. Wrappers may carry a :N deref-depth annotation and a where{...} predicate; a wrapper whose main part contains @0 treats @0 as T’s position ((u32, @0) → (u32, T)), otherwise it is applied as wrapper^T.

#[batch_impl(#blanket(@all_methods){Box})]
trait B { fn tag(&self) -> u32; }

Documentation marker only — never call this function.