{"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"pub(crate)"}]}
pub(crate) type CombineSubstructureFunc<'a> =
/// all the fields of all the structures.
    Box<dyn FnMut(&ExtCtxt<'_>, Span, &Substructure<'_>) -> BlockOrExpr + 'a>;