public void Visit(UpValRef e)
{
// The block where the upval was declared needs to be closed.
for (BlockBuilder outer = block; outer != null; outer = outer.Parent)
{
if (outer.Block == e.Variable.Block)
{
outer.SetNeedsClose();
break;
}
}
// Get upval.
function.InstructionABC(e.SourceSpan, Opcode.GetUpVal, target, function.UpVal(e.Variable), 0);
}