:$ f()
	:a = 1

	{a}

	~ a := a + 1

	:$ g
		:a = 1

		{a}

		~ a := a + 1

	:$ h()
		:a = 1

		{a}

		~ a := a + 1

	\> depth 2, unscoped:

	~ g

	~ g

	~ g

	\> depth 2, scoped:

	~ h

	~ h

	~ h

depth 1:

~ f

~ f

~ f