Merge pull request #76 from NathanReb/fix-conversion-failure-error

Fix error message for conversion failure

Author: NathanReb

ast/raise.ml

@@ -1,5 +1,5 @@
 let conversion_failed ~version node_name =
   let msg =
-    Printf.sprintf "Ppx_ast: Could not convert %s to %s" version node_name
+    Printf.sprintf "Ppx_ast: Could not convert %s to %s" node_name version
   in
   failwith msg