Fixing #7100 (lost of main file location in case of Ltac failure in other file).

2 files changed, 9 insertions, 0 deletions

diff --git a/lib/loc.ml b/lib/loc.ml
index 6f5283aab..1a09091bf 100644
--- a/lib/loc.ml
+++ b/lib/loc.ml
@@ -62,6 +62,11 @@ let merge_opt l1 l2 = match l1, l2 with
   | None, Some l  -> Some l
   | Some l1, Some l2 -> Some (merge l1 l2)
 
+let finer l1 l2 = match l1, l2 with
+  | None, _    -> false
+  | Some l , None -> true
+  | Some l1, Some l2 -> l1.fname = l2.fname && merge l1 l2 = l2
+
 let unloc loc = (loc.bp, loc.ep)
 
 let shift_loc kb kp loc = { loc with bp = loc.bp + kb ; ep = loc.ep + kp }
diff --git a/lib/loc.mli b/lib/loc.mli
index 813c45fbb..23df1ebd9 100644
--- a/lib/loc.mli
+++ b/lib/loc.mli
@@ -42,6 +42,10 @@ val merge : t -> t -> t
 val merge_opt : t option -> t option -> t option
 (** Merge locations, usually generating the largest possible span *)
 
+val finer : t option -> t option -> bool
+(** Answers [true] when the first location is more defined, or, when
+    both defined, included in the second one *)
+
 val shift_loc : int -> int -> t -> t
 (** [shift_loc loc n p] shifts the beginning of location by [n] and
     the end by [p]; it is assumed that the shifts do not change the