syntax_data: {"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"ty::GenericArgKind::Type(ty)"}]}
source_snippet:             ty::GenericArgKind::Type(ty) => Some(ty.into()),
context_before:             ty::GenericArgKind::Lifetime(_) => None,
context_after:             ty::GenericArgKind::Const(ct) => Some(ct.into()),