Function rustc_builtin_macros::deriving::decodable::expand_deriving_rustc_decodable

pub fn expand_deriving_rustc_decodable(
    cx: &mut ExtCtxt<'_>, 
    span: Span, 
    mitem: &MetaItem, 
    item: &Annotatable, 
    push: &mut dyn FnMut(Annotatable)
)