From 700bb19a9053e236df6a9f15d435c427391e3ecf Mon Sep 17 00:00:00 2001
From: Emeka Nkurumeh <emekankurumeh@outlook.com>
Date: Wed, 16 Oct 2019 17:15:52 -0500
Subject: [PATCH] fix std.mem.AsBytesReturnType (#3442)

closes #3334
---
 lib/std/mem.zig | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/lib/std/mem.zig b/lib/std/mem.zig
index 2091eb4804..601c50242d 100644
--- a/lib/std/mem.zig
+++ b/lib/std/mem.zig
@@ -1325,6 +1325,12 @@ fn AsBytesReturnType(comptime P: type) type {
     const size = usize(@sizeOf(meta.Child(P)));
     const alignment = comptime meta.alignment(P);
 
+    if (alignment == 0) {
+        if (comptime trait.isConstPtr(P))
+            return *const [size]u8;
+        return *[size]u8;
+    }
+
     if (comptime trait.isConstPtr(P))
         return *align(alignment) const [size]u8;
     return *align(alignment) [size]u8;
@@ -1364,6 +1370,10 @@ test "asBytes" {
         .d = 0xA1,
     };
     testing.expect(eql(u8, asBytes(&inst), "\xBE\xEF\xDE\xA1"));
+
+    const ZST = struct {};
+    const zero = ZST{};
+    testing.expect(eql(u8, asBytes(&zero), ""));
 }
 
 ///Given any value, returns a copy of its bytes in an array.