From 32d755beb8d83a666100ca9455df51b93caff1fc Mon Sep 17 00:00:00 2001
From: Julian <58199799+mov-rax@users.noreply.github.com>
Date: Mon, 3 Oct 2022 05:05:12 -0500
Subject: Sema: require reified packed struct fields to have zero alignment

---
 src/Sema.zig | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src')

diff --git a/src/Sema.zig b/src/Sema.zig
index aed09d6201..ed62fe02b2 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -17682,6 +17682,10 @@ fn reifyStruct(
         }
         const abi_align = @intCast(u29, (try alignment_val.getUnsignedIntAdvanced(target, sema.kit(block, src))).?);
 
+        if (layout == .Packed and abi_align != 0) {
+            return sema.fail(block, src, "alignment in a packed struct field must be set to 0", .{});
+        }
+
         const field_name = try name_val.toAllocatedBytes(
             Type.initTag(.const_slice_u8),
             new_decl_arena_allocator,
-- 
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