[parser] initialization based on Loc.t rather than Loc.source

In this way one can also set the current offsets in a file,
useful if you are parsing a Coq fragment within a file instead
of a full file starting from the first line.

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/loc.mli b/lib/loc.mli
index 23df1ebd9a..1eb3cc49e8 100644
--- a/lib/loc.mli
+++ b/lib/loc.mli
@@ -32,6 +32,9 @@ val create : source -> int -> int -> int -> int -> t
 (** Create a location from a filename, a line number, a position of the
     beginning of the line, a start and end position *)
 
+val initial : source -> t
+(** Create a location corresponding to the beginning of the given source *)
+
 val unloc : t -> int * int
 (** Return the start and end position of a location *)