Macro batch_impl_consts 

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

Documentation placeholder for the @ macro-meta constant system.

@ names expand before all other DSL processing (@ <> # where order):

• built-in name families: @uint / @int / @float / @num / @scalar and wildcards @u* / @i* / @f*;
• range families: @u8..u128 / @i8..i128 / @f32..f64 (inclusive);
• batch_trait! user constants: a leading @name = value; segment (lazy expansion, reference checks);
• @N position references (resolved by codegen) and @trait (segment-level trait path).

#[batch_impl(Box^@u*)]
trait C {}

Documentation marker only — never call this function.