Add missing #pragma once

Ericson2314 · Ericson2314 · commit 613de9d9cceb · 2025-09-17T15:21:21.000-04:00
diff --git a/src/libutil/include/nix/util/memory-source-accessor.hh b/src/libutil/include/nix/util/memory-source-accessor.hh
@@ -1,3 +1,6 @@
+#pragma once
+///@file
+
 #include "nix/util/source-path.hh"
 #include "nix/util/fs-sink.hh"
 #include "nix/util/variant-wrapper.hh"
