Add notes to eval output.

1 files changed, 7 insertions, 0 deletions

diff --git a/discocaml/ast.ml b/discocaml/ast.ml
index 63893fa..92ac32d 100644
--- a/discocaml/ast.ml
+++ b/discocaml/ast.ml
@@ -161,3 +161,10 @@ let parsetree_of_subexpr (ast : 'a ast) : expr -> Parsetree.expression =
 
 let parsetree_of_expr (ast : expr ast) : Parsetree.expression =
   parsetree_of_subexpr ast (get_subexpr ast ast.root)
+
+let show_expr (expr : expr ast) : string =
+  let buf = Buffer.create 16 in
+  let fmt = Format.formatter_of_buffer buf in
+  Pprintast.expression fmt (parsetree_of_expr expr);
+  Format.pp_print_flush fmt ();
+  Buffer.contents buf