debug json

compiler/src/test.rs

@@ -216,6 +216,7 @@ impl Namespace for CompileNamespace {
                 "debug print initial ast {:?}",
                 Ast::from_json_file("/tmp/output/initial_ast.json".into())
                     .unwrap_or_else(|_| Ast::new(Program::new("Error reading initial theorem.".to_string())))
+                    .to_json_string()
             );
         }