Test: more coverage for deinits

(cherry picked from commit a626c6b)

Author: kavon

test/Interpreter/moveonly_swiftskell.swift

@@ -14,7 +14,8 @@
 // RUN:                     -module-name E -o %t/E %target-rpath(%t)
 // RUN: %target-codesign %t/E
 // RUN: %target-codesign %t/%target-library-name(Swiftskell)
-// RUN: %target-run %t/E %t/%target-library-name(Swiftskell) | %FileCheck %s
+// RUN: %target-run %t/E %t/%target-library-name(Swiftskell) \
+// RUN:     | %FileCheck %s --implicit-check-not destroy
 
 // REQUIRES: executable_test
 
@@ -27,6 +28,8 @@ struct File: ~Copyable, Show {
     self.id = id
   }
   func show() -> String { return id.show() }
+
+  deinit { print("destroying file \(id)") }
 }
 
 
@@ -43,11 +46,24 @@ func testListBasic() {
   check(items.length() == 5)
   check(!items.isEmpty)
 
+  items = List<File>(length: 5) { .init($0) }
+  // CHECK: destroying file 4
+  // CHECK: destroying file 3
+  // CHECK: destroying file 2
+  // CHECK: destroying file 1
+  // CHECK: destroying file 0
+
   items = items.reverse()
   check(items.length() == 5)
   print(items.show())  // CHECK: [4, 3, 2, 1, 0, ]
 
   items = .empty
+  // CHECK: destroying file 0
+  // CHECK: destroying file 1
+  // CHECK: destroying file 2
+  // CHECK: destroying file 3
+  // CHECK: destroying file 4
+
   check(items.length() == 0)
   check(items.isEmpty)