From c04404635b9efa2d6642887ca40f6222c54d9465 Mon Sep 17 00:00:00 2001
From: LemonBoy <LemonBoy@users.noreply.github.com>
Date: Tue, 14 Aug 2018 20:38:04 +0200
Subject: Fix unsound transform pass (#8633)

When a `var openArray[T]` function parameter goes trough the
`transformAddrDeref` pass we may lose the `var` specifier, leading to
nasty crashes at runtime.
---
 tests/ccgbugs/topenarraycast.nim | 8 ++++++++
 1 file changed, 8 insertions(+)
 create mode 100644 tests/ccgbugs/topenarraycast.nim

(limited to 'tests/ccgbugs/topenarraycast.nim')

diff --git a/tests/ccgbugs/topenarraycast.nim b/tests/ccgbugs/topenarraycast.nim
new file mode 100644
index 000000000..7d1bc8d03
--- /dev/null
+++ b/tests/ccgbugs/topenarraycast.nim
@@ -0,0 +1,8 @@
+proc foo[T](s: var openArray[T]): T =
+  for x in s: result += x
+
+proc bar(xyz: var seq[int]) =
+  doAssert 6 == (seq[int](xyz)).foo()
+
+var t = @[1,2,3]
+bar(t)
-- 
cgit 1.4.1-2-gfad0