From 3c45a945285dff00d0eb8160342560bcb7d24cc5 Mon Sep 17 00:00:00 2001
From: mlugg <mlugg@mlugg.co.uk>
Date: Tue, 16 Apr 2024 22:38:54 +0100
Subject: Value: fix out-of-bounds slice access writing zero-bit undef value

I have no idea why this wasn't being hit on master before.
---
 src/Value.zig | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src/Value.zig')

diff --git a/src/Value.zig b/src/Value.zig
index 20674ff7d9..2e1a873867 100644
--- a/src/Value.zig
+++ b/src/Value.zig
@@ -469,7 +469,9 @@ pub fn writeToPackedMemory(
     const endian = target.cpu.arch.endian();
     if (val.isUndef(mod)) {
         const bit_size: usize = @intCast(ty.bitSize(mod));
-        std.mem.writeVarPackedInt(buffer, bit_offset, bit_size, @as(u1, 0), endian);
+        if (bit_size != 0) {
+            std.mem.writeVarPackedInt(buffer, bit_offset, bit_size, @as(u1, 0), endian);
+        }
         return;
     }
     switch (ty.zigTypeTag(mod)) {
-- 
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