syntax_data: {"ast_node_type":"other","tokens":[{"end":31,"kind":"keyword","start":0,"text":"has_guard:"}]}
source_snippet:         has_guard: ArmHasGuard,
context_before:         user_ty: Option<Box<UserTypeProjections>>,
context_after:         opt_match_place: Option<(Option<Place<'tcx>>, Span)>,