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delegate void FooFunc (); void foo (ref int[] a) { a = new int[1]; } void main() { int[] a = new int[10 * 1024 * 1024]; FooFunc func = () => { foo (ref a); }; func (); for (int i = 1; i < 10 * 1024 * 1024; i++) { a += 4711; } }