Ocaml_parsing.Location_auxSourcecompare l1 l2 compares start positions, if equal compares end positions
Return the smallest location covered by both arguments, ghost if both are ghosts
included ~into:parent child returns true if child is included in parent. Otherwise returns false.
overlap_with_range (pos_start, pos_end) loc returns true if loc overlap with the range defined by pos_start and pos_end.
Filter valid errors, log invalid ones