{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"subst_types:"}]}
    subst_types: Option<Vec<(hir::Symbol, hir::Type<'_>)>>,
    notable_traits: &[(hir::Trait, Vec<(Option<hir::Type<'_>>, hir::Name)>)],
    edition: Edition,