static array allocated on the heap does not call destructors on collection

[schveiguy]

A static array of structs with destructors does not call the finalizers on collection.

example:

struct S {
    ~this() {
        import std.stdio;
        writeln("dtor");
    }
}

void main() {
    auto arr = new S[1][1];
}
// no output

It is within spec to not guarantee destructors are called, but it is usually expected that if the memory allocated is collected (as it is in this case), the destructor will be called.

Imagine a case where a destructor removes its memory with some C library registry. If the dtor is not called but the memory is freed, then you have a dangling pointer still in the registry.