[Issue 22547] New: .dup on array of nested structs can cause null dereference if copy throws

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22547

          Issue ID: 22547
           Summary: .dup on array of nested structs can cause null
                    dereference if copy throws
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: druntime
          Assignee: nobody at puremagic.com
          Reporter: stanislav.blinov at gmail.com

As pointed out by @kinke here:
https://forum.dlang.org/post/yfiytdysalmauqadtvfy@forum.dlang.org

void main() {
    int i;
    struct S {
        // A copy ctor won't currently compile (dmd 2.098)
        // due to "cannot access stack frame pointer..."
        this(this) { throw new Exception("!!!"); }
        ~this() { ++i; }
    }

    auto a1 = [ S() ];
    auto a2 = a1.dup; // throws
} // segmentation fault when destructing a2 because a2[0].tupleof[$-1] is null

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