IPv6 mapped phrase not parsing MSVC2015

Hello,

Merry Christmas!

The same phrases/grammar is working on GCC but does not appear to work
across platforms on Microsoft Visual C++ 2015.

https://wandbox.org/permlink/LDudwkvVa0M7J6z0

The first couple of IPv4 mapped phrase grammars work, no problem. But
when I jump into the third, all of a sudden there is a problem. I've
tried different iterations how to compose the grammar, all are
rejecting the test case:

// Micro-grammar representing the phrase: / [*1(h16 ":") h16] "::"
3(h16 ":") ls32
_ipv6_addr_base = lexeme[
    _h16_col >> _h16 >> _col_x2 >> _h16_col >> _h16_col >> _h16
        | /* */ _h16 >> _col_x2 >> _h16_col >> _h16_col >> _h16
        | /*         */ _col_x2 >> _h16_col >> _h16_col >> _h16
];

// or...
_ipv6_addr_base = lexeme[
    -(_h16_col >> _h16
        | /*   */ _h16
        ) >> _col_x2 >> _h16_col >> _h16_col >> _h16
];

// or...
_ipv6_addr_base = lexeme[(
    _h16_col >> _h16 >> _col_x2
    | _h16 >> /*     */ _col_x2
    | /*             */ _col_x2
    ) >> _h16_col >> _h16_col >> _h16
];

// The bit with the ':' delimiter is the odd exception to including
Colon in the address.
_start = _ipv6_addr_base >> col_ >> _ls32 >> eoi;

// The test case: "::c60:b132:f8e2:120.48.69.95"

The same grammar/test case in GCC appears to pass without difficulties.

Running with Boost version: '106501'
Parsing '::1234:3456:5678:0.12.234.50' -> ::1234:3456:5678:0.12.234.50 (PASS)

Phrase elements are composed in the same way across platforms using
Integer parsers, etc.

What is the cross platform issue with Boost.Spirit, then? Open to suggestions...

Cheers,

Michael Powell

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