[Issue 21762] object.destroy may silently fail depending on whether a member function is a template

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21762

moonlightsentinel at disroot.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |moonlightsentinel at disroot.o
                   |                            |rg
           Hardware|x86_64                      |All
                 OS|Linux                       |All
           Severity|normal                      |regression

--- Comment #1 from moonlightsentinel at disroot.org ---
Reduced example:

----------------------------------------------
import core.stdc.stdio : puts;

struct A(T)
{
    T* address;

    ~this() {
        destroy(*address);
    }
}

void main() {
    static struct B {
        A!B next()();
        ~this() {
            puts("B destroyed");
        }
    }
    static struct C {
        A!C next();
        ~this() {
            puts("C destroyed");
        }
    }

    B b;
    destroy(b);

    C c;
    destroy(c);
}
----------------------------------------------

Introduced by https://github.com/dlang/druntime/pull/1312.
But it's probably a DMD issue because the PR introduced __traits(hasMember, S,
"__xdtor") which is true for B but false for C

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