More destruction ordering tests.

Author: jyasskin

Diff for: src/test/run-pass/destructor-ordering.rs

@@ -22,8 +22,58 @@ obj dorder(@order_tracker tracker, int order, str message) {
   }
 }
 
-fn main() {
+fn test_simple() {
   auto tracker = @order_tracker(0);
   dorder(tracker, 1, "Reverse decl order");
   dorder(tracker, 0, "Reverse decl order");
-}
+}
+
+fn test_block() {
+  auto tracker = @order_tracker(0);
+  dorder(tracker, 2, "Before block");
+  {
+    dorder(tracker, 0, "Inside block");
+  }
+  dorder(tracker, 1, "After block");
+}
+
+fn test_decl_v_init() {
+  auto tracker = @order_tracker(0);
+  auto var1;
+  auto var2;
+  var2 = dorder(tracker, 0, "decl, not init");
+  var1 = dorder(tracker, 1, "decl, not init");
+}
+
+fn test_overwritten_obj() {
+  auto tracker = @order_tracker(0);
+  auto var1 = dorder(tracker, 0, "overwritten object destroyed first");
+  auto var2 = dorder(tracker, 2, "destroyed at end of scope");
+  var1 = dorder(tracker, 3, "overwriter deleted in rev decl order");
+  {
+    dorder(tracker, 1, "overwritten object destroyed before end of scope");
+  }
+}
+
+// Used to embed dorder objects into an expression.  Note that the
+// parameters don't get destroyed.
+fn combine_dorders(dorder d1, dorder d2) -> int {
+  ret 1;
+}
+fn test_expression_destroyed_right_to_left() {
+  auto tracker = @order_tracker(0);
+  combine_dorders(dorder(tracker, 4, ""), dorder(tracker, 3, ""))
+    / combine_dorders(dorder(tracker, 2, ""), dorder(tracker, 1, ""));
+  {
+    dorder(tracker, 0,
+           "expression objects live to end of block, not statement");
+  }
+}
+
+fn main() {
+  test_simple();
+  test_block();
+  test_decl_v_init();
+  test_overwritten_obj();
+  test_expression_destroyed_right_to_left();
+}