def options(b: ir.IRBuilder, t: ir.Type) -> ir.Value:
new_block = b.function.append_basic_block("block")
with b.goto_block(new_block):
phi_node = b.phi(t)
def ret(value):
if not b.block.is_terminated:
phi_node.add_incoming(value, b.block)
b.branch(new_block)
yield ret, phi_node
b.position_at_end(new_block)
