Macro batch_trait 

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

Function-like macro that generates impl blocks for a declared trait in batch.

Syntax: unsafe? Trait path: impl-specs;, with ; separating multiple trait segments. After each segment’s : comes a DSL expression (type DSL + @ constants, same as #[batch_impl]).

# directives are not supported (#fill/#delegate/#blanket/open extension): directives need the trait definition as the signature source of truth, which batch_trait! as a function-like macro cannot access; use #[batch_impl] / #[batch_impl_only] when you need directives.

Examples

trait A {}
trait B<T> {}
unsafe trait UnsafeTrait{}

batch_trait!(
    A: usize, isize;
    B: <T> B<T> Vec<T>;
    unsafe UnsafeTrait: usize
);

Path traits (such as foo::C) are supported too; see tests/regression.rs.