From 580f62220c5384726fdcd526afeaf5e4954225e9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Zieli=C5=84ski?= <michal@zielinscy.org.pl>
Date: Wed, 6 Feb 2019 10:13:44 +0100
Subject: [PATCH] Fixes #10568: Fix null pointer dereference in address
 computation.

According to https://hownot2code.com/2016/08/18/null-pointer-dereferencing-causes-undefined-behavior/ this was an undefined behaviour.
---
 compiler/ccgexprs.nim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compiler/ccgexprs.nim b/compiler/ccgexprs.nim
index 5bcbcda1c..fb2fd89a3 100644
--- a/compiler/ccgexprs.nim
+++ b/compiler/ccgexprs.nim
@@ -1123,7 +1123,7 @@ proc genSeqElemAppend(p: BProc, e: PNode, d: var TLoc) =
   #    seq = (typeof seq) incrSeq(&seq->Sup, sizeof(x));
   #    seq->data[seq->len-1] = x;
   let seqAppendPattern = if not p.module.compileToCpp:
-                           "($2) #incrSeqV3(&($1)->Sup, $3)"
+                           "($2) #incrSeqV3((TGenericSeq*)($1), $3)"
                          else:
                            "($2) #incrSeqV3($1, $3)"
   var a, b, dest, tmpL, call: TLoc