@Nullable
  private InstructionImpl handlePossibleReturn(@NotNull GrStatement possibleReturn) {
    if (possibleReturn instanceof GrExpression && ControlFlowBuilderUtil.isCertainlyReturnStatement(possibleReturn)) {
      return addNodeAndCheckPending(new MaybeReturnInstruction((GrExpression)possibleReturn));
    }
    return null;
  }
@Nullable
  private InstructionImpl handlePossibleReturn(@NotNull GrStatement possibleReturn)