func (c *typeConv) FinishType(pos token.Pos) {
	// Completing one pointer type might produce more to complete.
	// Keep looping until they're all done.
	for len(c.ptrKeys) > 0 {
		dtype := c.ptrKeys[0]
		dtypeKey := dtype.String()
		c.ptrKeys = c.ptrKeys[1:]
		ptrs := c.ptrs[dtypeKey]
		delete(c.ptrs, dtypeKey)

		// Note Type might invalidate c.ptrs[dtypeKey].
		t := c.Type(dtype, pos)