[Issue 18167] std.array.appender should be usable in @safe

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18167

--- Comment #1 from Seb <greensunny12 at gmail.com> ---
Another example:

void test @safe {

    static class A {}
    auto w = appender!(shared(A)[])();
    w.put(new shared A());

}

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