destructors now work with overloaded assignment operators; fixes #2811; fixes #1632

tests/exception/tdefer1.nim

@@ -1,6 +1,10 @@
 discard """
   output: '''hi
-hi'''
+hi
+1
+hi
+B
+A'''
 """
 
 # bug #1742
@@ -16,3 +20,23 @@ import strutils
 let x = try: parseInt("133a")
         except: -1
         finally: echo "hi"
+
+
+template atFuncEnd =
+  defer:
+    echo "A"
+  defer:
+    echo "B"
+
+template testB(): expr =
+    let a = 0
+    defer: echo "hi" # Delete this line to make it work
+    a
+
+proc main =
+  atFuncEnd()
+  echo 1
+  let i = testB()
+  echo 2
+
+main()