[Issue 20440] Associative arrays of BigInt does not support require or get function

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20440

mipri <mipri at minimaltype.com> changed:

           What    |Removed                     |Added
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                 CC|                            |mipri at minimaltype.com

--- Comment #1 from mipri <mipri at minimaltype.com> ---
with v2.086.1, either of the following permits the test case to compile:

in phobos/std/bigint.d, add a 'ref' to the following return type:

    /// Assignment from another BigInt.
    BigInt opAssign(T:BigInt)(T x) pure @nogc

in druntime/import/object.d, change the last line of require from

    return found ? *p : (*p = value);

to

    if (!found) *p = value;
    return *p;

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