lookupBySpan :: Span -> DetailsMap -> Maybe TokenDetails
lookupBySpan tspan = listToMaybe . map snd . filter (matches tspan . fst)
lookupBySpan :: Span -> DetailsMap -> Maybe TokenDetails
lookupBySpan tspan = listToMaybe . map snd . filter (matches tspan . fst)
lookupBySpan tspan = listToMaybe . map snd . filter (matches tspan . fst)