From 7eea68edb49432834f2053646ed8958ebc601c37 Mon Sep 17 00:00:00 2001
From: Emery Hemingway <ehmry@posteo.net>
Date: Tue, 6 Dec 2022 20:22:01 -0600
Subject: [PATCH] Add warning when preserving fails

---
 src/preserves.nim | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/preserves.nim b/src/preserves.nim
index f87614f..8c242f6 100644
--- a/src/preserves.nim
+++ b/src/preserves.nim
@@ -830,8 +830,12 @@ proc toPreserve*[T](x: T; E = void): Preserve[E] =
         var pr = fieldToPreserve(key, val)
         applyEmbed(key, pr)
         result[toSymbol(key, E)] = pr
-    else: result = toPreserveHook(x, E)
-  else: result = toPreserveHook(x, E)
+    else:
+      {.warning: "failed to preserve " & $T .}
+      result = toPreserveHook(x, E)
+  else:
+    {.warning: "failed to preserve " & $T .}
+    result = toPreserveHook(x, E)
     # the hook doesn't compile but produces a useful error
   trace T, " -> ", result