syntax_data: {"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"paths:"}]}
source_snippet:     paths: FxHashMap<(DefId, &'tcx [GenericArg<'tcx>]), usize>,
context_before:     /// The values are start positions in `out`, in bytes.
context_after:     types: FxHashMap<Ty<'tcx>, usize>,