1 files changed, 6 insertions, 3 deletions
diff --git a/lib/drl/parser.ml b/lib/drl/parser.ml
index 76d4b4e..df8e485 100644
--- a/lib/drl/parser.ml
+++ b/lib/drl/parser.ml
@@ -1,13 +1,16 @@
-type error = ParseError of string
+module Error = struct
+  open Condition
+  let parse_error msg = condition "parse-error" ("message" |=| (of_string msg))
+end
 
 let of_sexp sexp =
   match Ast.query_of_sexp sexp with
   | q -> Ok q
-  | exception exn -> Error (ParseError (Printexc.to_string exn))
+  | exception exn -> Error (Error.parse_error (Printexc.to_string exn))
 
 let of_string s =
   match Sexplib.Sexp.of_string s |> Ast.query_of_sexp with
   | q -> Ok q
-  | exception exn -> Error (ParseError (Printexc.to_string exn))
+  | exception exn -> Error (Error.parse_error (Printexc.to_string exn))
 
 let to_string q = Ast.sexp_of_query q |> Sexplib.Sexp.to_string_hum