[Issue 11188] std.math.abs fails for shared BigInt type

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=11188

b2.temp at gmx.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |b2.temp at gmx.com
            Summary|std.math.abs fails for      |std.math.abs fails for
                   |shared, const or immutable  |shared BigInt type
                   |BigInt types                |

--- Comment #10 from b2.temp at gmx.com ---
Only valid for shared nowadays

import std.bigint, std.math, std.typetuple;

auto foo(T)()
{
    T n = -3;
    return std.math.abs(n);
}

void main()
{
    foreach (T; TypeTuple!(byte, short, int, long, BigInt))
    {
        assert(foo!T() == 3);             // works
        assert(foo!(shared(T)) == 3);     // fails for BigInt
    }
}

The problem is that operator overloads don't accept shared

void main()
{
    import std.bigint;
    shared(BigInt) i = 0;
    assert(i >= 0);
}

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