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digitalmars.D - Why does std.intrinsic contain nothrow?

Right at the beginning of the file there is:

module std.intrinsic;


Nevertheless some functions are

pure nothrow int bsf(uint v);

some not:

int btc(uint *p, uint bitnum);

So either those nothrows are obsolete or the nothrow: is a mistake, right?
Feb 04 2010