t.Fatal("wrong error:", s.Err())
	}
}

// Test for issue 5268.
type alwaysError struct{}

func (alwaysError) Read(p []byte) (int, error) {
	return 0, io.ErrUnexpectedEOF
}

func TestNonEOFWithEmptyRead(t *testing.T) {
	scanner := NewScanner(alwaysError{})
	for scanner.Scan() {
		t.Fatal("read should fail")
	}
	err := scanner.Err()
	if err != io.ErrUnexpectedEOF {