99990194ce Remove WithParams serialization helper (MarcoFalke)
ffffb4af83 scripted-diff: Use ser params operator (MarcoFalke)
fae9054793 test: Use SER_PARAMS_OPFUNC in serialize_tests.cpp (MarcoFalke)
Pull request description:
Every serialization parameter struct already has the `SER_PARAMS_OPFUNC`, except for one in the tests.
For consistency, and to remove verbose code, convert the test to `SER_PARAMS_OPFUNC`, and use it everywhere, then remove the `WithParams` helper.
ACKs for top commit:
ajtowns:
reACK 99990194ce
TheCharlatan:
Re-ACK 99990194ce
Tree-SHA512: be9cae4225a502486fe8d552aaf4b2cd2904a9f73cce9d931c6b7c757594ff1982fcc2c30d00d012cd12b0a9531fd609f8bcd7c94b811e965ac087eb8a3589d3
This commits fixes a crash bug that can be caused with the following steps:
- change to the "Transactions" view
- right-click on an arbitrary transaction -> "Show transaction details"
- close the transaction detail window again
- select "Settings" -> "Mask values"
The problem is that the list of opened dialogs, tracked in the member
variable `m_opened_dialogs`, is only ever appended with newly opened
transaction detail dialog pointers, but never removed. This leads to
dangling pointers in the list, and if the "Mask values" menu item is
selected, a crash is caused in the course of trying to close the opened
transaction detail dialogs (see `closeOpenedDialogs()` method). Fix this
by removing the pointer from the list if the corresponding widget is
destroyed.
fa56067a8f refactor: Fix bugprone-string-constructor warning (MarcoFalke)
Pull request description:
String literals in C++ have a trailing null character, so the current code is fine to rely on that implicitly. However,
* the sqlite documentation explicitly mentions the null character
* code readers may wonder if the code is intentional
* clang-tidy warns about the code via `bugprone-string-constructor`
Address the points by putting the null character into the code and enable the clang-tidy `bugprone-string-constructor` check.
ACKs for top commit:
stickies-v:
ACK fa56067a8f
Tree-SHA512: da519184d792a885a8151ffc44c8da5781f5aaae12ef768a187cc6d9e542ca8952aebc2ec6c1a05f673f29a86ef44902ee96e7b491af7b4705ad38e14624882e
that are otherwise private:
- CConnman::m_nodes
- CConnman::ConnectNodes()
- CConnman::AlreadyConnectedToAddress()
and update the #include headers per iwyu.
`CConnman::GetAddedNodeInfo` is used both to get a list of addresses to manually connect to
in `CConnman::ThreadOpenAddedConnections`, and to report about manually added connections in
`getaddednodeinfo`. In both cases, all addresses added to `m_added_nodes` are returned, however
the nodes we are already connected to are only relevant to the latter, in the former they are
actively discarded.
Parametrizes `CConnman::GetAddedNodeInfo` so we can ask for only addresses we are not connected to,
to avoid passing useless information around.
Currently it is possible to add the same node twice when formatting IPs in
different, yet equivalent, manner. This applies to both ipv4 and ipv6, e.g:
127.0.0.1 = 127.1 | [::1] = [0:0:0:0:0:0:0:1]
`addnode` will accept both and display both as connected (given they translate to
the same IP). This will not result in multiple connections to the same node, but
will report redundant info when querying `getaddednodeinfo` and populate `m_added_nodes`
with redundant data.
This can be avoided performing comparing the contents of `m_added_addr` and the address
to be added as `CServices` instead of as strings.
The current `addnode` rpc command has some edge cases in where it is possible to
connect to the same node twice by combining ip and address requests. This can happen under two situations:
The two commands are run one right after each other, in which case they will be processed
under the same loop in `CConnman::ThreadOpenAddedConnections` without refreshing `vInfo`, so both
will go trough. An example of this would be:
```
bitcoin-cli addnode "localhost:port" add
```
A node is added by IP using `addnode "add"` while the other is added by name using
`addnode "onetry"` with an address that resolves to multiple IPs. In this case, we currently
only check one of the resolved IPs (picked at random), instead of all the resolved ones, meaning
this will only probabilistically fail/succeed. An example of this would be:
```
bitcoin-cli addnode "127.0.0.1:port" add
[...]
bitcoin-cli addnode "localhost:port" onetry
```
Both cases can be fixed by iterating over all resolved addresses in `CConnman::ConnectNode` instead
of picking one at random
faa769db5a Fix bugprone-lambda-function-name errors (MarcoFalke)
Pull request description:
Inside a lambda, `__func__` will evaluate to something like `"operator()"`. Fix this by either removing it, or by using the real name.
https://clang.llvm.org/extra/clang-tidy/checks/bugprone/lambda-function-name.html
ACKs for top commit:
TheCharlatan:
ACK faa769db5a
darosior:
utACK faa769db5a
Tree-SHA512: 0b562bd4ebd7f46ca3ebabeee67851ad30bd522fa57e5010e833b163664e51f5df645ff9ca35d22c3479fb27d9267d4e5d0d417d42729bf3ccf80d7944970e4e
811067ca1c test: add coverage for snapshot chainstate not matching AssumeUTXO parameters (pablomartin4btc)
4a5be10b92 assumeutxo, blockstorage: prevent core dump on invalid hash (pablomartin4btc)
Pull request description:
While reviewing #27596 (ran `loadtxoutset` in `mainnet` before `m_assumeutxo_data` is empty as [currently](434495a8c1/src/kernel/chainparams.cpp (L175-L177)) in master - back to 1b1d711), got a `core dumped`, so it seems there's a potential issue if new releases ever remove snapshot details or a semi-experienced user performs a `loadtxoutset` on a different "customised" binary version (not sure if this is a real use case).
```
2023-10-18T17:42:52Z [init] Using obfuscation key for /tmp/.test_utxo_2/blocks/index: 0000000000000000
node/blockstorage.cpp:390 LoadBlockIndex: Assertion `GetParams().AssumeutxoForBlockhash(*snapshot_blockhash)' failed.
Aborted (core dumped)
```
<details>
<summary>This is also happening before IBD is completed (<code>background validation</code> still being performed as it can be seen in rpc <code>getchainstates</code>)</summary>
```
/src/bitcoin-cli -datadir=${AU_DATADIR} getchainstates
{
"headers": 813097,
"chainstates": [
{
"blocks": 368249,
"bestblockhash": "00000000000000000b7a08224a1cb00d337100ba7a46c03d04b2c2d8964efc37",
"difficulty": 52278304845.59168,
"verificationprogress": 0.086288278873286,
"coins_db_cache_bytes": 7969177,
"coins_tip_cache_bytes": 14908338995,
"validated": true
},
{
"blocks": 813097,
"bestblockhash": "0000000000000000000270c9fdce7b17db64cca91f90106964b58e33a4d91089",
"difficulty": 61030681983175.59,
"verificationprogress": 0.999997140098457,
"coins_db_cache_bytes": 419430,
"coins_tip_cache_bytes": 784649420,
"snapshot_blockhash": "00000000000000000002a7c4c1e48d76c5a37902165a270156b7a8d72728a054",
"validated": false
}
]
}
```
</details>
<details>
<summary>Steps to reproduce the core dump error and its output:</summary>
1. Perform a `loadtxoutset` in `mainnet` on compiled `bitcoind` adding the block hash from Sjors's [commit](24deb2022b).
2. Once step 1 finishes, remove the added code from step 1 and compile again or just compile `master` without any changes on top.
3. Run `bitcoind`, soon it'll crash with:
```
2023-10-18T17:42:52Z [init] init message: Loading block index…
2023-10-18T17:42:52Z [init] Assuming ancestors of block 00000000000000000001a0a448d6cf2546b06801389cc030b2b18c6491266815 have valid signatures.
2023-10-18T17:42:52Z [init] Setting nMinimumChainWork=000000000000000000000000000000000000000052b2559353df4117b7348b64
2023-10-18T17:42:52Z [init] Prune configured to target 3000 MiB on disk for block and undo files.
2023-10-18T17:42:52Z [init] [snapshot] detected active snapshot chainstate (/tmp/.test_utxo_2/chainstate_snapshot) - loading
2023-10-18T17:42:52Z [init] [snapshot] switching active chainstate to Chainstate [snapshot] @ height -1 (null)
2023-10-18T17:42:52Z [init] Opening LevelDB in /tmp/.test_utxo_2/blocks/index
2023-10-18T17:42:52Z [init] Opened LevelDB successfully
2023-10-18T17:42:52Z [init] Using obfuscation key for /tmp/.test_utxo_2/blocks/index: 0000000000000000
node/blockstorage.cpp:390 LoadBlockIndex: Assertion `GetParams().AssumeutxoForBlockhash(*snapshot_blockhash)' failed.
Aborted (core dumped)
```
</details>
<details>
<summary>After original change, error message output:</summary>
```
2023-10-20T15:49:12Z [init] init message: Loading block index…
2023-10-20T15:49:12Z [init] Assuming ancestors of block 00000000000000000001a0a448d6cf2546b06801389cc030b2b18c6491266815 have valid signatures.
2023-10-20T15:49:12Z [init] Setting nMinimumChainWork=000000000000000000000000000000000000000052b2559353df4117b7348b64
2023-10-20T15:49:12Z [init] Prune configured to target 3000 MiB on disk for block and undo files.
2023-10-20T15:49:12Z [init] [snapshot] detected active snapshot chainstate (/tmp/.test_utxo_2/chainstate_snapshot) - loading
2023-10-20T15:49:12Z [init] [snapshot] switching active chainstate to Chainstate [snapshot] @ height -1 (null)
2023-10-20T15:49:12Z [init] Opening LevelDB in /tmp/.test_utxo_2/blocks/index
2023-10-20T15:49:12Z [init] Opened LevelDB successfully
2023-10-20T15:49:12Z [init] Using obfuscation key for /tmp/.test_utxo_2/blocks/index: 0000000000000000
2023-10-20T15:49:13Z [init] *** Assumeutxo data not found for the given blockhash '00000000000000000002a7c4c1e48d76c5a37902165a270156b7a8d72728a054'.
2023-10-20T15:49:13Z [init] Error: Assumeutxo data not found for the given blockhash '00000000000000000002a7c4c1e48d76c5a37902165a270156b7a8d72728a054'.
Error: Assumeutxo data not found for the given blockhash '00000000000000000002a7c4c1e48d76c5a37902165a270156b7a8d72728a054'.
2023-10-20T15:49:13Z [init] Shutdown requested. Exiting.
2023-10-20T15:49:13Z [init] Shutdown: In progress...
2023-10-20T15:49:13Z [scheduler] scheduler thread exit
2023-10-20T15:49:13Z [shutoff] Flushed fee estimates to fee_estimates.dat.
2023-10-20T15:49:13Z [shutoff] Shutdown: done
```
</details>
<details>
<summary>Alternative on error handling using <code>return error()</code> instead of <code>return FatalError()</code> used in this PR, which produces a different output and perhaps confusing:</summary>
```
2023-10-20T21:45:58Z [init] Using obfuscation key for /tmp/.test_utxo_2/blocks/index: 0000000000000000
2023-10-20T21:45:59Z [init] ERROR: Assumeutxo data not found for the given blockhash '00000000000000000002a7c4c1e48d76c5a37902165a270156b7a8d72728a054'.
2023-10-20T21:45:59Z [init] : Error loading block database.
Please restart with -reindex or -reindex-chainstate to recover.
: Error loading block database.
Please restart with -reindex or -reindex-chainstate to recover.
2023-10-20T21:45:59Z [init] Aborted block database rebuild. Exiting.
2023-10-20T21:45:59Z [init] Shutdown: In progress...
2023-10-20T21:45:59Z [scheduler] scheduler thread exit
2023-10-20T21:45:59Z [shutoff] Flushed fee estimates to fee_estimates.dat.
2023-10-20T21:45:59Z [shutoff] Shutdown: done
```
</details>
<details>
<summary>Current state (including ryanofsky <a href="https://github.com/bitcoin/bitcoin/pull/28698#discussion_r1368635965">suggestion</a>), after code change, error message output:</summary>
```
2023-10-25T02:29:57Z [init] Using obfuscation key for /home/pablo/.test_utxo_2/regtest/blocks/index: 0000000000000000
2023-10-25T02:29:57Z [init] *** Assumeutxo data not found for the given blockhash 'f09b5835f3f8b39481f2af3257bbc2e82845552d4d2d6d31cf520fc24263ed5b'.
2023-10-25T02:29:57Z [init] Error: A fatal internal error occurred, see debug.log for details
Error: A fatal internal error occurred, see debug.log for details
2023-10-25T02:29:57Z [init] Shutdown requested. Exiting.
2023-10-25T02:29:57Z [init] Shutdown: In progress...
2023-10-25T02:29:57Z [scheduler] scheduler thread exit
2023-10-25T02:29:57Z [shutoff] Flushed fee estimates to fee_estimates.dat.
2023-10-25T02:29:57Z [shutoff] Shutdown: done
```
</details>
ACKs for top commit:
naumenkogs:
ACK 811067ca1c
theStack:
ACK 811067ca1c
ryanofsky:
Code review ACK 811067ca1c.
Tree-SHA512: cfc137b0a4f638b99fd7dac2c35cc729ef71ae1166a2a8960a91055ec90841cb33aed589834012cfe0e157937e2a76a88d1020ea1df2bc98e1114eb1fc8eaae4
91d0888921 sync: unpublish LocksHeld() which is used only in sync.cpp (Vasil Dimov)
3df37e0c78 doc: clarify that LOCK() does AssertLockNotHeld() internally (Vasil Dimov)
Pull request description:
Constructs like
```cpp
AssertLockNotHeld(m);
LOCK(m);
```
are equivalent to (almost, modulo some logging differences, see below)
```cpp
LOCK(m);
```
for non-recursive mutexes, so it is ok to omit `AssertLockNotHeld()` in such cases. Requests to do the former keep coming during review process. `developer-notes.md` explicitly states "Combine annotations in function declarations with run-time asserts in function definitions", but that seems to be too strong or unclear. `LOCK()` is also a run-time assert in this case.
Also remove `LocksHeld()` from the public interface in `sync.h` since it is only used in `sync.cpp`.
ACKs for top commit:
achow101:
ACK 91d0888921
hebasto:
ACK 91d0888921, I have reviewed the code and it looks OK.
Tree-SHA512: c4b7ef2c0bfeb28d1c4f55f497810f629873137e02f5a92137c02cb1ff603ac76473dcd2171e594491494a5cb87b8c0c803e06b86f190d4acb231791e28e802d
fb3e812277 p2p: return `CSubNet` in `LookupSubNet` (brunoerg)
Pull request description:
Analyzing the usage of `LookupSubNet`, noticed that most cases uses check if the subnet is valid by calling `subnet.IsValid()`, and the boolean returned by `LookupSubNet` hasn't been used so much, see:
29d540b7ad/src/httpserver.cpp (L172-L174)29d540b7ad/src/net_permissions.cpp (L114-L116)
It makes sense to return `CSubNet` instead of `bool`.
ACKs for top commit:
achow101:
ACK fb3e812277
vasild:
ACK fb3e812277
theStack:
Code-review ACK fb3e812277
stickies-v:
Concept ACK, but Approach ~0 (for now). Reviewed the code (fb3e812277) and it all looks good to me.
Tree-SHA512: ba50d6bd5d58dfdbe1ce1faebd80dd8cf8c92ac53ef33519860b83399afffab482d5658cb6921b849d7a3df6d5cea911412850e08f3f4e27f7af510fbde4b254
940a49978c Use type-safe txid types in orphanage (dergoegge)
ed70e65016 Introduce types for txids & wtxids (dergoegge)
cdb14d79e8 [net processing] Use HasWitness over comparing (w)txids (dergoegge)
Pull request description:
We currently have two different identifiers for transactions: `txid` (refering to the hash of a transaction without witness data) and `wtxid` (referring to the hash of a transaction including witness data). Both are typed as `uint256` which could lead to type-safety bugs in which one transaction identifier type is passed where the other would be expected.
This PR introduces explicit `Txid` and `Wtxid` types that (if used) would cause compilation errors for such type confusion bugs.
(Only the orphanage is converted to use these types in this PR)
ACKs for top commit:
achow101:
ACK 940a49978c
stickies-v:
ACK 940a49978c
hebasto:
ACK 940a49978c, I have reviewed the code and it looks OK.
instagibbs:
re-ACK 940a49978c
BrandonOdiwuor:
re-ACK 940a49978c
glozow:
reACK 940a49978c
Tree-SHA512: 55298d1c2bb82b7a6995e96e554571c22eaf4a89fb2a4d7a236d70e0f625e8cca62ff2490e1c179c47bd93153fe6527b56870198f026f5ee7753d64d7a424c92
1111475b41 bugfix: Mark CNoDestination and PubKeyDestination constructor explicit (MarcoFalke)
fa5ccc4137 iwyu: Export prevector.h from script.h (MarcoFalke)
Pull request description:
It seems confusing to allow any script, even one with a corresponding address, to silently convert to `CNoDestination`.
Make the converstion `explicit` in the code, and fix any bugs that were previously introduced.
In a follow-up, the class can be renamed, or the documentation can be updated to better reflect what the code does.
ACKs for top commit:
josibake:
ACK 1111475b41
achow101:
ACK 1111475b41
furszy:
Code review ACK 1111475
Tree-SHA512: d8b5f54d0cd8649a31e227ef164bb13e5b81ee9820f1976fd70c7a0de6841fba72d549c2f63e351c8cdda37dceb4763eca203e1c8ef385f46d9da6f1855c39ec
This should fix the bug reported in
https://github.com/bitcoin/bitcoin/pull/28246#discussion_r1371640502,
which caused the GUI to not detect the destination type of recipients,
thus picking the wrong change destination type.
Also, add missing lifetimebound attribute to a getter method.
856325fac1 lint: Add `lint-qt-translation.py` (Hennadii Stepanov)
294a018bf5 qt: Avoid error prone leading spaces in translatable strings (Hennadii Stepanov)
d8298e7f06 qt, refactor: Drop superfluous type conversions (Hennadii Stepanov)
Pull request description:
While working on the GUI translation via Transifex web interface, I found it error-prone to have leading whitespace in translatable strings. This is because it is very easy to unintentionally drop them in translations unnoticed.
Fixed all current cases. Added a linter to prevent similar cases in the future.
ACKs for top commit:
furszy:
utACK 856325f
Tree-SHA512: b1ca5effb2db6649e1e99382de79acf3a9f81cc9dad434db5623338489e597897e8addd60c1ab3dcc7506ae62753a7a4ad5a41d7a865f8fcdf94348b54baa7e7
51e4dc49f5 gui: Show error if unrecognized command line args are present (John Moffett)
Pull request description:
Fixes https://github.com/bitcoin-core/gui/issues/741
Starting bitcoin-qt with non-hyphen ("-") arguments causes it to silently ignore any later valid options. For instance, invoking `bitcoin-qt -server=1 foo -regtest` on a fresh install will run `mainnet` instead of `regtest`.
This change makes the client exit with an error message if any such "loose" arguments are encountered. This mirrors how `bitcoind` handles it:
c6287faae4/src/bitcoind.cpp (L127-L132)
However, BIP-21 `bitcoin:` payment URIs are still allowed, but only if they're not followed by any additional options.
ACKs for top commit:
maflcko:
lgtm ACK 51e4dc49f5
hernanmarino:
tested ACK 51e4dc49f5
pablomartin4btc:
tACK 51e4dc49f5
hebasto:
ACK 51e4dc49f5, I have reviewed the code and it looks OK.
Tree-SHA512: 3997a7a9a747314f13e118aee63e8679e00ed832d9c6f115559a4c39c9c4091572207c60e362cb4c19fc8da980d4b0b040050aa70c5ef84a855cb7e3568bbf13
This should cut some include bloat and seems fine to do, because
prevector exists primarily to represent scripts.
Also, add missing includes to script.h and addresstype.h
Currently the shutdown function resets the kernel before the
chainman and scheduler. Invert this order by resetting the kernel
last, since they might rely on the kernel.
4814e4063e test: Check tx metadata is migrated to watchonly (Andrew Chow)
d616d30ea5 wallet: Reload watchonly and solvables wallets after migration (Andrew Chow)
118f2d7d70 wallet: Copy all tx metadata to watchonly wallet (Andrew Chow)
9af87cf348 test: Check that a failed wallet migration is cleaned up (Andrew Chow)
Pull request description:
Some incomplete/incorrect state as a result of migration can be mitigated/cleaned up by simply restarting the migrated wallets. We already do this for a wallet when it is migrated, but we do not for the new watchonly and solvables wallets that may be created. This PR introduces this behavior, in addition to creating those wallets initially without an attached chain.
While implementing this, I noticed that not all `CWalletTx` metadata was being copied over to the watchonly wallet and so some data, such as time received, was being lost. This PR fixes this as a side effect of not having a chain attached to the watchonly wallet. A test has also been added.
ACKs for top commit:
ishaanam:
light code review ACK 4814e4063e
ryanofsky:
Code review ACK 4814e4063e. Just implemented the suggested orderpos, copyfrom, and path set comments since last review
furszy:
ACK 4814e406
Tree-SHA512: 0b992430df9f452cb252c2212df8e876613f43564fcd1dc00c6c31fa497adb84dfff6b5ef597590f9b288c5f64cb455f108fcc9b6c9d1fe9eb2c39e7f2c12a89
No change in behavior, this just moves code which updates transaction state to
a new method so it can be used after offline processes such as wallet
migration.
4bfaad4eca chainparams, assumeutxo: Fix signet txoutset hash (Fabian Jahr)
a503cd0f0b chainparams, assumeutxo: Fix testnet txoutset hash (Fabian Jahr)
f6213929c5 assumeutxo: Check deserialized coins for out of range values (Fabian Jahr)
66865446a7 docs: Add release notes for #28685 (Fabian Jahr)
cb0336817e scripted-diff: Rename hash_serialized_2 to hash_serialized_3 (Fabian Jahr)
351370a1d2 coinstats: Fix hash_serialized2 calculation (Fabian Jahr)
Pull request description:
Closes #28675
The last commit demonstrates that theStack's analysis [here](https://github.com/bitcoin/bitcoin/issues/28675#issuecomment-1770389468) seems to be correct. There will be more changes needed for the rest of the test suite but the `feature_assumeutxo.py` with my additional tests pass.
ACKs for top commit:
achow101:
ACK 4bfaad4eca
theStack:
Code-review ACK 4bfaad4eca
ryanofsky:
Code review ACK 4bfaad4eca
Tree-SHA512: 2f6abc92b282f7c5da46391803cf0804d13978d191d541f2509b532c538abccd0a081e46cda23d80d47206a05fa2b5d41b7ab246e6a263db7a7461d6292116ef
6bdff429ec build: Include `config/bitcoin-config.h` explicitly in `util/trace.h` (Hennadii Stepanov)
Pull request description:
The `ENABLE_TRACING` macro is expected to be defined in the `config/bitcoin-config.h` header.
Therefore, the current code is error-prone as it depends on whether the `config/bitcoin-config.h` header was included before or not.
This bug was noticed while working on CMake [stuff](https://github.com/hebasto/bitcoin/pull/37).
ACKs for top commit:
fanquake:
ACK 6bdff429ec
Tree-SHA512: 22c4fdeb51628814050eb99a83db4268a4f3106207eeef918a07214bbc52f2b22490f6b05fcb96216f147afa4197c51102503738131e2583e750b6d195747a49
fac36b94ef refactor: Remove CBlockFileInfo::SetNull (MarcoFalke)
Pull request description:
Seems better to use C++11 member initializers and then let the compiler figure out how to construct objects of this class.
ACKs for top commit:
stickies-v:
ACK fac36b94ef
pablomartin4btc:
ACK fac36b94ef
theStack:
LGTM ACK fac36b94ef
Tree-SHA512: aee741c8f668f0e5b658fc83f4ebd196b43fead3dd437afdb0a2dafe092ae3d559332b3d9d61985c92e1a59982d8f24942606e6a98598c6ef7ff43697e858725
The legacy serialization was vulnerable to maleation and is fixed by
adopting the same serialization procedure as was already in use for
MuHash.
This also includes necessary test fixes where the hash_serialized2 was
hardcoded as well as correction of the regtest chainparams.
Co-authored-by: Sebastian Falbesoner <sebastian.falbesoner@gmail.com>
dd4dcbd4cd [fuzz] Delete i2p target (dergoegge)
Pull request description:
closes #28665
The target is buggy and doesn't reach basic coverage.
ACKs for top commit:
maflcko:
lgtm ACK dd4dcbd4cd
glozow:
ACK dd4dcbd4cd, agree it's better to delete this test until somebody wants to write a better one
Tree-SHA512: b6ca6cad1773b1ceb6e5ac0fd501ea615f66507ef811745799deaaa4460f1700d96ae03cf55b740a96ed8cd2283b3d6738cd580ba97f2af619197d6c4414ca21
Also add test to make sure this doesn't get broken in the future.
This was breaking vector<bool> serialization in multiprocess code because
template current deduction guides would make it appear like vector<bool> could
be converted to a span, but then the actual conversion to span would fail.
