From c9268b2a5d2e52fa94415477fecc055d092c86b2 Mon Sep 17 00:00:00 2001
From: Emery Hemingway <ehmry@posteo.net>
Date: Wed, 7 Dec 2022 01:18:51 -0600
Subject: [PATCH] Cannot embed a void value

---
 src/preserves.nim | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/preserves.nim b/src/preserves.nim
index 8c242f6..0df0f39 100644
--- a/src/preserves.nim
+++ b/src/preserves.nim
@@ -746,7 +746,9 @@ proc toPreserve*[T](x: T; E = void): Preserve[E] =
   ## When `tracePreserves` is defined (`-d:tracePreserves`) a diagnostic
   ## trace is printing during `toPreserve`.
   when (T is Preserve[E]): result = x
-  elif T is E: result = embed(x)
+  elif T is E:
+    when E is void: {.error: "cannot embed void".}
+    result = embed(x)
   elif compiles(toPreserveHook(x, E)):
     result = toPreserveHook(x, E)
   elif T is enum: