Bug 4220 – I cannot apply @safe to intrinsic operation(eg: std.math.sqrt)

I try to apply @safe/@trusted/@system to Phobos See also http://lists.puremagic.com/pipermail/phobos/2010-May/000488.html I found this issue there. This issue causes mangling that had been influenced by @safe/@trusted. dmd converts a specific symbol into intrinsic operation. However, dmd cannot convert symbols that are marked by @safe/@trusted. I am skeptical about the influence on mangling rule by @safe. It may be related to overload, but I think that overload is unnecessary.

changeset 499 (also requires new std.math)

Requires the following changes to std.math: 317c317 < pure nothrow real cos(real x); /* intrinsic */ --- > @safe pure nothrow real cos(real x); /* intrinsic */ 332c332 < pure nothrow real sin(real x); /* intrinsic */ --- > @safe pure nothrow real sin(real x); /* intrinsic */ 397c397 < pure nothrow real tan(real x) --- > @trusted pure nothrow real tan(real x) 808c808 < pure nothrow long rndtol(real x); /* intrinsic */ --- > @safe pure nothrow long rndtol(real x); /* intrinsic */ 830c830 < pure nothrow --- > @safe pure nothrow 1388c1388 < pure nothrow real ldexp(real n, int exp); /* intrinsic */ --- > @safe pure nothrow real ldexp(real n, int exp); /* intrinsic */ 1582c1582 < pure nothrow real fabs(real x); /* intrinsic */ --- > @safe pure nothrow real fabs(real x); /* intrinsic */ 1781c1781 < pure nothrow real rint(real x); /* intrinsic */ --- > @safe pure nothrow real rint(real x); /* intrinsic */ 3610,3611c3610,3611 < pure nothrow real yl2x(real x, real y); // y * log2(x) < pure nothrow real yl2xp1(real x, real y); // y * log2(x + 1) --- > @safe pure nothrow real yl2x(real x, real y); // y * log2(x) > @safe pure nothrow real yl2xp1(real x, real y); // y * log2(x + 1)