remove unwanted changes

compiler/injectdestructors.nim

@@ -612,11 +612,8 @@ proc p(n: PNode; c: var Con; mode: ProcessMode): PNode =
 proc moveOrCopy(dest, ri: PNode; c: var Con): PNode =
   case ri.kind
   of nkCallKinds:
-    if isUnpackedTuple(dest):
-      result = newTree(nkFastAsgn, dest, p(ri, c, consumed))
-    else:
-      result = genSink(c, dest, ri)
-      result.add p(ri, c, consumed)
+    result = genSink(c, dest, ri)
+    result.add p(ri, c, consumed)
   of nkBracketExpr:
     if isUnpackedTuple(ri[0]):
       # unpacking of tuple: take over elements

tests/destructor/t12037.nim

@@ -32,3 +32,4 @@ proc bug(start: (seq[int], int)) =
 
 let input = @[0]
 bug((input, 0))
+doASsert(input.len == 1)