Derive Macro fmt_derive::Debug

#[derive(Debug)]
{
    // Attributes available to this derive:
    #[fmt]
    #[debug]
}

Derive implementations of Debug for arbitrary structs and enums (unions are supported only with a top-level format directive). useing fmt_derive::Debug, will also pull in the core::fmt::Debug/[std::fmt::Debug] trait (but the macro of the same name will be replaced with this one).