[Issue 10498] `__traits(compiles, ...)` affect program behaviour

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10498


Denis Shelomovskij <verylonglogin.reg at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|major                       |regression


--- Comment #1 from Denis Shelomovskij <verylonglogin.reg at gmail.com> 2013-06-29 11:56:14 MSD ---
Another situation:
---
template triggerIssue(A...)
{ enum triggerIssue = __traits(compiles, { auto a = A[0]; }); }

template PackedGenericTuple(Args...)
{
    alias Args Tuple;
    enum e = triggerIssue!Args;
}

template T()
{
    struct S{} // The fact `S` is in `T` causes the problem
    alias T = PackedGenericTuple!S;
}

void main()
{
    alias t = T!();
    static assert(is(t.Tuple[0]));
}
---

The second one is reduced (no sure if correct) from regression failure.

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