From a5f18c2b2ae86126e0fd0cba67676ae68ba0f1df Mon Sep 17 00:00:00 2001
From: Rocknest <35231115+Rocknest@users.noreply.github.com>
Date: Thu, 30 Jan 2020 10:00:28 +0200
Subject: Fix one more edge case

---
 lib/std/debug.zig | 1 +
 1 file changed, 1 insertion(+)

(limited to 'lib')

diff --git a/lib/std/debug.zig b/lib/std/debug.zig
index 2dd1da50c3..9cd76cb30c 100644
--- a/lib/std/debug.zig
+++ b/lib/std/debug.zig
@@ -131,6 +131,7 @@ pub fn dumpStackTraceFromBase(bp: usize, ip: usize) void {
     const tty_config = detectTTYConfig();
     printSourceAtAddress(debug_info, stderr, ip, tty_config) catch return;
     const first_return_address = @intToPtr(*const usize, bp + @sizeOf(usize)).*;
+    if (first_return_address == 0) return; // The whole call stack may be optimized out
     printSourceAtAddress(debug_info, stderr, first_return_address - 1, tty_config) catch return;
     var it = StackIterator{
         .first_addr = null,
-- 
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