Revert "close #16607 add testcase (#17317)" (#17336)

This reverts commit 1655103d83.

tests/destructor/t16607.nim

@@ -1,24 +0,0 @@
-discard """
-  matrix: "--gc:refc; --gc:arc"
-"""
-
-# bug #16607
-
-type
-  O {.requiresInit.} = object
-    initialized: bool
-
-proc `=destroy`(o: var O) =
-  doAssert o.initialized, "O was destroyed before initialization!"
-
-proc initO(): O =
-  O(initialized: true)
-
-proc pair(): tuple[a, b: O] =
-  result.a = initO()
-  result.b = initO()
-
-proc main() =
-  discard pair()
-
-main()