@Nullable
  private static PyTargetExpression getDeclaration(@NotNull PyCallExpression call) {
    final PsiElement parent = call.getParent();
    if (parent instanceof PyAssignmentStatement) {
      return PyUtil.as(((PyAssignmentStatement)parent).getLeftHandSideExpression(), PyTargetExpression.class);
    }
    return null;
  }
@Nullable
  private static PyTargetExpression getDeclaration(@NotNull PyCallExpression call)