[Issue 5568] A problem with BigInt modulus

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=5568



--- Comment #5 from Don <clugdbug at yahoo.com.au> 2011-02-19 00:50:51 PST ---
Reduced test case:

import std.bigint;
void main() {
    enum int Y = 2008;
    BigInt m = (BigInt(1) << (Y*1 + 1)) - 1;
    BigInt b = (BigInt(1) << (Y*2 + 1)) - 1;
    BigInt c = (BigInt(1) << (Y*3 + 1)) - 1;
    BigInt w =  c - b;
    w = w % m;
}

This trips an assert when Phobos is compiled in debug mode.

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