From d68ae35c1153c6263292d60e4f5f6b828d7c8e8f Mon Sep 17 00:00:00 2001
From: daurnimator <quae@daurnimator.com>
Date: Wed, 20 Feb 2019 13:28:56 +1100
Subject: [PATCH] std: when a FixedBufferAllocator is initialised, set the
 buffer to undefined

---
 std/heap.zig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/std/heap.zig b/std/heap.zig
index e257977f9d..b76850325c 100644
--- a/std/heap.zig
+++ b/std/heap.zig
@@ -273,6 +273,10 @@ pub const FixedBufferAllocator = struct {
     buffer: []u8,
 
     pub fn init(buffer: []u8) FixedBufferAllocator {
+        // This loop gets optimized out in ReleaseFast mode
+        for (buffer) |*byte| {
+            byte.* = undefined;
+        }
         return FixedBufferAllocator{
             .allocator = Allocator{
                 .allocFn = alloc,