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

tests/destructor/tdestructor3.nim

@@ -0,0 +1,47 @@
+discard """
+  output: '''assign
+destroy
+destroy
+destroy Foo: 5
+5
+destroy Foo: 123
+123'''
+"""
+
+# bug #2821
+{.experimental.}
+
+type T = object
+
+proc `=`(lhs: var T, rhs: T) =
+    echo "assign"
+
+proc `=destroy`(v: var T) =
+    echo "destroy"
+
+block:
+    var v1 : T
+    var v2 : T = v1
+
+
+# bug #1632
+
+type
+  Foo = object of RootObj
+    x: int
+
+proc `=destroy`(a: var Foo) =
+  echo "destroy Foo: " & $a.x
+
+template toFooPtr(a: int{lit}): ptr Foo =
+  var temp = Foo(x:a)
+  temp.addr
+
+proc test(a: ptr Foo) =
+  echo a[].x
+
+proc main =
+  test(toFooPtr(5))
+  test(toFooPtr(123))
+
+main()