From e2c2ae8e7e54ab333b578f707ac89c87c3390b4c Mon Sep 17 00:00:00 2001
From: cooldome <cdome@bk.ru>
Date: Fri, 23 Mar 2018 12:28:22 +0000
Subject: [PATCH] fixes #7392 (#7395)

---
 compiler/ccgexprs.nim                | 1 +
 tests/ccgbugs/mymodule.nim           | 4 +++-
 tests/ccgbugs/tforward_decl_only.nim | 5 +++++
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/compiler/ccgexprs.nim b/compiler/ccgexprs.nim
index 060a5fdbd..6ea56d71d 100644
--- a/compiler/ccgexprs.nim
+++ b/compiler/ccgexprs.nim
@@ -2044,6 +2044,7 @@ proc upConv(p: BProc, n: PNode, d: var TLoc) =
       if t.kind notin {tyVar, tyLent} or not p.module.compileToCpp:
         r = "(*$1)" % [r]
       t = skipTypes(t.lastSon, abstractInst)
+    discard getTypeDesc(p.module, t)
     if not p.module.compileToCpp:
       while t.kind == tyObject and t.sons[0] != nil:
         add(r, ".Sup")
diff --git a/tests/ccgbugs/mymodule.nim b/tests/ccgbugs/mymodule.nim
index d3306ec49..8c78cdf9b 100644
--- a/tests/ccgbugs/mymodule.nim
+++ b/tests/ccgbugs/mymodule.nim
@@ -1,7 +1,9 @@
 type
   MyRefObject* = ref object
     s: string
-
+  
+  BaseObj* = ref object of RootObj
+  ChildObj* = ref object of BaseObj
 
 proc newMyRefObject*(s: string): MyRefObject =
   new(result)
diff --git a/tests/ccgbugs/tforward_decl_only.nim b/tests/ccgbugs/tforward_decl_only.nim
index f4e9c216e..2a867bc3b 100644
--- a/tests/ccgbugs/tforward_decl_only.nim
+++ b/tests/ccgbugs/tforward_decl_only.nim
@@ -27,3 +27,8 @@ proc f(foo: ptr Foo, foo2: ptr Foo2): cint =
   if foo2 != nil: {.emit: [result, " = ", foo2[], ".b;"].}
 
 discard f(nil, nil)
+
+
+# bug #7392
+var x1: BaseObj
+var x2 = ChildObj(x1)