void convertExpression(PsiExpression expr, PsiType toType, PsiType fromType, boolean isCovariantPosition) {
    final PsiMember member = expr instanceof PsiMethodCallExpression ? ((PsiMethodCallExpression)expr).resolveMethod() : null;
    convertExpression(expr, toType, fromType, isCovariantPosition, member);
  }
void convertExpression(PsiExpression expr, PsiType toType, PsiType fromType, boolean isCovariantPosition)