[Issue 21322] New: Struct field destructor not called when exception is thrown in the main struct destructor

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21322

          Issue ID: 21322
           Summary: Struct field destructor not called when exception is
                    thrown in the main struct destructor
           Product: D
           Version: D2
          Hardware: x86_64
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: chalucha at gmail.com

How to reproduce:

```D
import std;

struct Foo {
    Bar bar;
    bool err;

    ~this() {
        // scope(failure) destroy(bar); // < this fixes the Bar destructor call
        enforce(!err, "Test err");
    }
}

struct Bar {
    static int refs;
    ~this() { refs--; }
}

void main()
{
    {
        Foo f;
        Bar.refs = 1;
    }
    assert(Bar.refs == 0);

    try () {
        Foo f;
        f.err = true;
        Bar.refs = 1;
    }();
    catch (Exception ex) {}
    assert(Bar.refs == 0);
}
```

So when the exception is thrown within Foo destructor, Bar's destructor isn't
called anymore.

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