1 files changed, 9 insertions, 7 deletions
diff --git a/lib/interpreter.ml b/lib/interpreter.ml
index 21c1430..346ceb5 100644
--- a/lib/interpreter.ml
+++ b/lib/interpreter.ml
@@ -11,20 +11,22 @@
 
 type error_code = InvalidSyntax | MenhirCode of int
 
-type error = {
-  code : error_code;
-  start_pos : Lexing.position;
-  end_pos : Lexing.position;
-}
-
 module Interpreter (MI : MenhirLib.IncrementalEngine.INCREMENTAL_ENGINE) =
 struct
+  type error = {
+    code : error_code;
+    start_pos : Lexing.position;
+    end_pos : Lexing.position;
+
+  }
+
   module E = MenhirLib.ErrorReports
   module L = MenhirLib.LexerUtil
 
   type step = MI.token * Lexing.position * Lexing.position
 
-  let range_message (start_pos, end_pos) code = { code; start_pos; end_pos }
+  let range_message (start_pos, end_pos) : error_code -> error =
+   fun code -> { code; start_pos; end_pos }
 
   let get_parse_error lexbuf env : error =
     match MI.stack env with