The following code snippet compiles successfully WITHOUT DIP1000 enabled:

void main(string[] args) @safe @nogc
{
    scope f = () {
        auto a = args;
    };
}

But compiling the same code WITH DIP100 enabled, the following compile error occurs:

main.d(1): Error: function `D main` is @nogc yet allocates closures with the GC
main.d(3):        main.main.__lambda2 closes over variable args at main.d(1)