http://d.puremagic.com/issues/show_bug.cgi?id=5979

           Summary: bigint rvalue equality
           Product: D
           Version: D2
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nob...@puremagic.com
        ReportedBy: dpx.infin...@gmail.com


--- Comment #0 from Vladimir Matveev <dpx.infin...@gmail.com> 2011-05-11 
09:46:20 PDT ---
Code

import std.bigint;

BigInt foo() {
    return BigInt(128);
}

void main() {
    BigInt bar = BigInt(128);
    assert(foo() == bar);
    assert(bar == foo());  // *** HERE
}

does not compile with the following error on the marked line:
test.d(10): Error: foo() is not an lvalue

It seems that is because of the ref parameter of the opEquals method in the
BigInt structure. Obviously it is not needed for the parameter to be a
reference in this case, though it could be thought as a possible performance
tweak (I don't know for certain about the correctnes of this though).

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