Fix error message; arguments were swapped around.

diff --git a/lib/whenutils.ml b/lib/whenutils.ml
index cdfca47..d53ac7e 100644 (file)
--- a/lib/whenutils.ml
+++ b/lib/whenutils.ml
@@ -249,7 +249,7 @@ and expr_of_iexpr _loc = function
 
   | IExpr_app (("change"|"changes"|"changed"|"inc"|"increase"|"increases"|"increased"|"dec"|"decrease"|"decreases"|"decreased"|"prev"|"previous") as op, _) ->
     invalid_arg (sprintf "%s: '%s' operator must be followed by a variable name"
-                   op (Loc.to_string _loc))
+                   (Loc.to_string _loc) op)
 
   | IExpr_app (op, _) ->
     invalid_arg (sprintf "%s: unknown operator in expression: %s"