type Pos struct {
	base      *PosBase
	line, col uint32
}

// MakePos returns a new Pos for the given PosBase, line and column.
func MakePos(base *PosBase, line, col uint) Pos { return Pos{base, sat32(line), sat32(col)} }

// TODO(gri) IsKnown makes an assumption about linebase < 1.
// Maybe we should check for Base() != nil instead.

func (pos Pos) Pos() Pos       { return pos }

        // HFS and HFS+ on macOS
        "hfs",
        "ext3",
        "ext4",
        "btrfs",
        "xfs",
        // NTFS on macOS
        "ntfs",
        // NTFS on Windows
        "NTFS",
        // FAT32 on macOS
        "msdos",
        // exFAT on macOS
        "exfat",
        // VirtualBox FS
        "vboxsf"
    );

    private final FileSystems fileSystems;

	// adrp followed by a LD16 or ST16 instruction.
	R_ARM64_PCREL_LDST16

	// R_ARM64_PCREL_LDST32 resolves a PC-relative addresses instruction sequence, usually an
	// adrp followed by a LD32 or ST32 instruction.
	R_ARM64_PCREL_LDST32

	// R_ARM64_PCREL_LDST64 resolves a PC-relative addresses instruction sequence, usually an
	// adrp followed by a LD64 or ST64 instruction.
	R_ARM64_PCREL_LDST64