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695f001161
Second pay can fail if first is not completely settled:
```
def test_zeroconf_forward(node_factory, bitcoind):
"""Ensure that we can use zeroconf channels in forwards.
...
# Make sure (esp in non-dev-mode) blockheights agree so we don't WIRE_EXPIRY_TOO_SOON...
sync_blockheight(bitcoind, [l1, l2, l3])
inv = l3.rpc.invoice(42 * 10**6, 'inv1', 'desc')['bolt11']
l1.rpc.pay(inv)
# And now try the other way around: zeroconf channel first
# followed by a public one.
wait_for(lambda: len(l3.rpc.listchannels()['channels']) == 4)
inv = l1.rpc.invoice(42, 'back1', 'desc')['bolt11']
> l3.rpc.pay(inv)
...
> raise RpcError(method, payload, resp['error'])
E pyln.client.lightning.RpcError: RPC call failed: method: pay, payload: {'bolt11': 'lnbcrt420p1p3junrssp588gtjzmlrr4pfj7ssmdlulzhhushrpq3rdqxjuz2m33scsvzdjlspp5fk5yhu6netc0d0sgp8es52vjk6akhd3uayr08u8max4d8rwzpjuqdq8v3jhxccxqyjw5qcqp99qyysgqcpyyugejv4nya97v6gw8fhtr0ru3vq87jjlltav99wlat436a95n0z8yzdp699p9md0zz9tmnsjpvfj622n9g9fh7r6ldhpgh9wmr4qpcru3rk'}, error: {'code': 210, 'message': 'Destination 0266e4598d1d3c415f572a8488830b60f7e744ed9235eb0b1ba93283b315c03518 is not reachable directly and all routehints were unusable.', 'attempts': [{'status': 'failed', 'failreason': 'Destination 0266e4598d1d3c415f572a8488830b60f7e744ed9235eb0b1ba93283b315c03518 is not reachable directly and all routehints were unusable.', 'partid': 0, 'amount_msat': 42msat}]}
```
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>