1 files changed, 4 insertions, 0 deletions
diff --git a/cpp/013run b/cpp/013run
index 7399b2e3..4917271b 100644
--- a/cpp/013run
+++ b/cpp/013run
@@ -100,6 +100,10 @@ if (argc > 1) {
 :(code)
 void load(string filename) {
   ifstream fin(filename.c_str());
+  if (!fin) {
+    raise << "no such file " << filename << '\n';
+    return;
+  }
   fin >> std::noskipws;
   add_recipes(fin);
   fin.close();