    pub const addr = 0x01;
    pub const block2 = 0x03;
    pub const block4 = 0x04;
    pub const data2 = 0x05;
    pub const data4 = 0x06;
    pub const data8 = 0x07;
    pub const string = 0x08;
    pub const block = 0x09;
    pub const block1 = 0x0a;
    pub const data1 = 0x0b;
    pub const flag = 0x0c;
    pub const sdata = 0x0d;
    pub const strp = 0x0e;
    pub const udata = 0x0f;
    pub const ref_addr = 0x10;
    pub const ref1 = 0x11;
    pub const ref2 = 0x12;
    pub const ref4 = 0x13;
    pub const ref8 = 0x14;
    pub const ref_udata = 0x15;
    pub const indirect = 0x16;
    pub const sec_offset = 0x17;
    pub const exprloc = 0x18;
    pub const flag_present = 0x19;
    pub const strx = 0x1a;
    pub const addrx = 0x1b;
    pub const ref_sup4 = 0x1c;
    pub const strp_sup = 0x1d;
    pub const data16 = 0x1e;
    pub const line_strp = 0x1f;
    pub const ref_sig8 = 0x20;
    pub const implicit_const = 0x21;
    pub const loclistx = 0x22;
    pub const rnglistx = 0x23;
    pub const ref_sup8 = 0x24;
    pub const strx1 = 0x25;
    pub const strx2 = 0x26;
    pub const strx3 = 0x27;
    pub const strx4 = 0x28;
    pub const addrx1 = 0x29;
    pub const addrx2 = 0x2a;
    pub const addrx3 = 0x2b;
    pub const addrx4 = 0x2c;

    // Extensions for Fission.  See http://gcc.gnu.org/wiki/DebugFission.

    pub const GNU_addr_index = 0x1f01;
    pub const GNU_str_index = 0x1f02;

    // Extensions for DWZ multifile.

    // See http://www.dwarfstd.org/ShowIssue.php?issue=120604.1&type=open .

    pub const GNU_ref_alt = 0x1f20;
    pub const GNU_strp_alt = 0x1f21;