http://d.puremagic.com/issues/show_bug.cgi?id=6359

           Summary: Pure/@safe-inference should not be affected by
                    __traits(compiles)
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Mac OS X
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: kennytm@gmail.com


--- Comment #0 from kennytm@gmail.com 2011-07-20 14:35:16 PDT ---
Test case:

------------------------------
@system void f6359() {}
pure void bug6359()() {
    static if (__traits(compiles, f6359())) {  // <-- this won't compile
        static assert(0);
    }
}
void g6359() pure nothrow @safe {
    bug6359();
}
------------------------------
x.d(9): Error: safe function 'g6359' cannot call system function 'bug6359'
------------------------------

The stuff inside `__traits(compiles, )` won't affect the purity/safety of the program. Therefore, in the inference, the failed semantic to the @system function `f6359` should not make `bug6359()` not able to be @safe.

The same happens if the annotation of `bug6359` is changed to @safe, which now it is no longer inferable as pure.

nothrow is not affected.

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