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use anyhow::Error;
pub fn get_error_code(err: &Error) -> Option<&'static str> {  err    .downcast_ref::<std::io::Error>()    .map(|e| match e.raw_os_error() {      Some(code) => get_os_error_code(code),      None => get_io_error_code(e),    })    .and_then(|code| match code.is_empty() {      true => None,      false => Some(code),    })}
fn get_io_error_code(err: &std::io::Error) -> &'static str {  // not exhaustive but simple and possibly sufficient once `io_error_more` is stabilized (https://github.com/rust-lang/rust/issues/86442)  // inversion of https://github.com/rust-lang/rust/blob/dca3f1b786efd27be3b325ed1e01e247aa589c3b/library/std/src/sys/unix/mod.rs#L138-L185  // TODO(@AaronO): revisit as `io_error_more` lands in rust stable  use std::io::ErrorKind;  match err.kind() {    // ErrorKind::ArgumentListTooLong => "E2BIG",    ErrorKind::AddrInUse => "EADDRINUSE",    ErrorKind::AddrNotAvailable => "EADDRNOTAVAIL",    // ErrorKind::ResourceBusy => "EBUSY",    ErrorKind::ConnectionAborted => "ECONNABORTED",    ErrorKind::ConnectionRefused => "ECONNREFUSED",    ErrorKind::ConnectionReset => "ECONNRESET",    // ErrorKind::Deadlock => "EDEADLK",    // ErrorKind::FilesystemQuotaExceeded => "EDQUOT",    ErrorKind::AlreadyExists => "EEXIST",    // ErrorKind::FileTooLarge => "EFBIG",    // ErrorKind::HostUnreachable => "EHOSTUNREACH",    ErrorKind::Interrupted => "EINTR",    ErrorKind::InvalidInput => "EINVAL",    // ErrorKind::IsADirectory => "EISDIR",    // ErrorKind::FilesystemLoop => "ELOOP",    ErrorKind::NotFound => "ENOENT",    ErrorKind::OutOfMemory => "ENOMEM",    // ErrorKind::StorageFull => "ENOSPC",    ErrorKind::Unsupported => "ENOSYS",    // ErrorKind::TooManyLinks => "EMLINK",    // ErrorKind::FilenameTooLong => "ENAMETOOLONG",    // ErrorKind::NetworkDown => "ENETDOWN",    // ErrorKind::NetworkUnreachable => "ENETUNREACH",    ErrorKind::NotConnected => "ENOTCONN",    // ErrorKind::NotADirectory => "ENOTDIR",    // ErrorKind::DirectoryNotEmpty => "ENOTEMPTY",    ErrorKind::BrokenPipe => "EPIPE",    // ErrorKind::ReadOnlyFilesystem => "EROFS",    // ErrorKind::NotSeekable => "ESPIPE",    // ErrorKind::StaleNetworkFileHandle => "ESTALE",    ErrorKind::TimedOut => "ETIMEDOUT",    // ErrorKind::ExecutableFileBusy => "ETXTBSY",    // ErrorKind::CrossesDevices => "EXDEV",    ErrorKind::PermissionDenied => "EACCES", // NOTE: Collides with EPERM ...    _ => "",  }}
/// Maps OS errno codes to string names/// derived from libuv: https://github.com/libuv/libuv/blob/26b2e5dbb6301756644d6e4cf6ca9c49c00513d3/include/uv/errno.h/// generated with tools/codegen_error_codes.js#[cfg(unix)]fn get_os_error_code(errno: i32) -> &'static str {  match errno {    libc::E2BIG => "E2BIG",    libc::EACCES => "EACCES",    libc::EADDRINUSE => "EADDRINUSE",    libc::EADDRNOTAVAIL => "EADDRNOTAVAIL",    libc::EAFNOSUPPORT => "EAFNOSUPPORT",    libc::EAGAIN => "EAGAIN",    libc::EALREADY => "EALREADY",    libc::EBADF => "EBADF",    libc::EBUSY => "EBUSY",    libc::ECANCELED => "ECANCELED",    libc::ECONNABORTED => "ECONNABORTED",    libc::ECONNREFUSED => "ECONNREFUSED",    libc::ECONNRESET => "ECONNRESET",    libc::EEXIST => "EEXIST",    libc::EFAULT => "EFAULT",    libc::EHOSTUNREACH => "EHOSTUNREACH",    libc::EINVAL => "EINVAL",    libc::EIO => "EIO",    libc::EISCONN => "EISCONN",    libc::EISDIR => "EISDIR",    libc::ELOOP => "ELOOP",    libc::EMFILE => "EMFILE",    libc::EMSGSIZE => "EMSGSIZE",    libc::ENAMETOOLONG => "ENAMETOOLONG",    libc::ENETUNREACH => "ENETUNREACH",    libc::ENOBUFS => "ENOBUFS",    libc::ENOENT => "ENOENT",    libc::ENOMEM => "ENOMEM",    libc::ENOSPC => "ENOSPC",    libc::ENOTCONN => "ENOTCONN",    libc::ENOTEMPTY => "ENOTEMPTY",    libc::ENOTSOCK => "ENOTSOCK",    libc::ENOTSUP => "ENOTSUP",    libc::EPERM => "EPERM",    libc::EPIPE => "EPIPE",    libc::EPROTONOSUPPORT => "EPROTONOSUPPORT",    libc::EROFS => "EROFS",    libc::ETIMEDOUT => "ETIMEDOUT",    libc::EXDEV => "EXDEV",    libc::ESOCKTNOSUPPORT => "ESOCKTNOSUPPORT",    _ => "",  }}
#[cfg(windows)]fn get_os_error_code(errno: i32) -> &'static str {  match errno {    998 => "EACCES",            // ERROR_NOACCESS    10013 => "EACCES",          // WSAEACCES    1920 => "EACCES",           // ERROR_CANT_ACCESS_FILE    1227 => "EADDRINUSE",       // ERROR_ADDRESS_ALREADY_ASSOCIATED    10048 => "EADDRINUSE",      // WSAEADDRINUSE    10049 => "EADDRNOTAVAIL",   // WSAEADDRNOTAVAIL    10047 => "EAFNOSUPPORT",    // WSAEAFNOSUPPORT    10035 => "EAGAIN",          // WSAEWOULDBLOCK    10037 => "EALREADY",        // WSAEALREADY    1004 => "EBADF",            // ERROR_INVALID_FLAGS    6 => "EBADF",               // ERROR_INVALID_HANDLE    33 => "EBUSY",              // ERROR_LOCK_VIOLATION    231 => "EBUSY",             // ERROR_PIPE_BUSY    32 => "EBUSY",              // ERROR_SHARING_VIOLATION    995 => "ECANCELED",         // ERROR_OPERATION_ABORTED    10004 => "ECANCELED",       // WSAEINTR    1236 => "ECONNABORTED",     // ERROR_CONNECTION_ABORTED    10053 => "ECONNABORTED",    // WSAECONNABORTED    1225 => "ECONNREFUSED",     // ERROR_CONNECTION_REFUSED    10061 => "ECONNREFUSED",    // WSAECONNREFUSED    64 => "ECONNRESET",         // ERROR_NETNAME_DELETED    10054 => "ECONNRESET",      // WSAECONNRESET    183 => "EEXIST",            // ERROR_ALREADY_EXISTS    80 => "EEXIST",             // ERROR_FILE_EXISTS    111 => "EFAULT",            // ERROR_BUFFER_OVERFLOW    10014 => "EFAULT",          // WSAEFAULT    1232 => "EHOSTUNREACH",     // ERROR_HOST_UNREACHABLE    10065 => "EHOSTUNREACH",    // WSAEHOSTUNREACH    122 => "EINVAL",            // ERROR_INSUFFICIENT_BUFFER    13 => "EINVAL",             // ERROR_INVALID_DATA    87 => "EINVAL",             // ERROR_INVALID_PARAMETER    1464 => "EINVAL",           // ERROR_SYMLINK_NOT_SUPPORTED    10022 => "EINVAL",          // WSAEINVAL    10046 => "EINVAL",          // WSAEPFNOSUPPORT    1102 => "EIO",              // ERROR_BEGINNING_OF_MEDIA    1111 => "EIO",              // ERROR_BUS_RESET    23 => "EIO",                // ERROR_CRC    1166 => "EIO",              // ERROR_DEVICE_DOOR_OPEN    1165 => "EIO",              // ERROR_DEVICE_REQUIRES_CLEANING    1393 => "EIO",              // ERROR_DISK_CORRUPT    1129 => "EIO",              // ERROR_EOM_OVERFLOW    1101 => "EIO",              // ERROR_FILEMARK_DETECTED    31 => "EIO",                // ERROR_GEN_FAILURE    1106 => "EIO",              // ERROR_INVALID_BLOCK_LENGTH    1117 => "EIO",              // ERROR_IO_DEVICE    1104 => "EIO",              // ERROR_NO_DATA_DETECTED    205 => "EIO",               // ERROR_NO_SIGNAL_SENT    110 => "EIO",               // ERROR_OPEN_FAILED    1103 => "EIO",              // ERROR_SETMARK_DETECTED    156 => "EIO",               // ERROR_SIGNAL_REFUSED    10056 => "EISCONN",         // WSAEISCONN    1921 => "ELOOP",            // ERROR_CANT_RESOLVE_FILENAME    4 => "EMFILE",              // ERROR_TOO_MANY_OPEN_FILES    10024 => "EMFILE",          // WSAEMFILE    10040 => "EMSGSIZE",        // WSAEMSGSIZE    206 => "ENAMETOOLONG",      // ERROR_FILENAME_EXCED_RANGE    1231 => "ENETUNREACH",      // ERROR_NETWORK_UNREACHABLE    10051 => "ENETUNREACH",     // WSAENETUNREACH    10055 => "ENOBUFS",         // WSAENOBUFS    161 => "ENOENT",            // ERROR_BAD_PATHNAME    267 => "ENOENT",            // ERROR_DIRECTORY    203 => "ENOENT",            // ERROR_ENVVAR_NOT_FOUND    2 => "ENOENT",              // ERROR_FILE_NOT_FOUND    123 => "ENOENT",            // ERROR_INVALID_NAME    15 => "ENOENT",             // ERROR_INVALID_DRIVE    4392 => "ENOENT",           // ERROR_INVALID_REPARSE_DATA    126 => "ENOENT",            // ERROR_MOD_NOT_FOUND    3 => "ENOENT",              // ERROR_PATH_NOT_FOUND    11001 => "ENOENT",          // WSAHOST_NOT_FOUND    11004 => "ENOENT",          // WSANO_DATA    8 => "ENOMEM",              // ERROR_NOT_ENOUGH_MEMORY    14 => "ENOMEM",             // ERROR_OUTOFMEMORY    82 => "ENOSPC",             // ERROR_CANNOT_MAKE    112 => "ENOSPC",            // ERROR_DISK_FULL    277 => "ENOSPC",            // ERROR_EA_TABLE_FULL    1100 => "ENOSPC",           // ERROR_END_OF_MEDIA    39 => "ENOSPC",             // ERROR_HANDLE_DISK_FULL    2250 => "ENOTCONN",         // ERROR_NOT_CONNECTED    10057 => "ENOTCONN",        // WSAENOTCONN    145 => "ENOTEMPTY",         // ERROR_DIR_NOT_EMPTY    10038 => "ENOTSOCK",        // WSAENOTSOCK    50 => "ENOTSUP",            // ERROR_NOT_SUPPORTED    5 => "EPERM",               // ERROR_ACCESS_DENIED    1314 => "EPERM",            // ERROR_PRIVILEGE_NOT_HELD    230 => "EPIPE",             // ERROR_BAD_PIPE    232 => "EPIPE",             // ERROR_NO_DATA    233 => "EPIPE",             // ERROR_PIPE_NOT_CONNECTED    10058 => "EPIPE",           // WSAESHUTDOWN    10043 => "EPROTONOSUPPORT", // WSAEPROTONOSUPPORT    19 => "EROFS",              // ERROR_WRITE_PROTECT    121 => "ETIMEDOUT",         // ERROR_SEM_TIMEOUT    10060 => "ETIMEDOUT",       // WSAETIMEDOUT    17 => "EXDEV",              // ERROR_NOT_SAME_DEVICE    1 => "EISDIR",              // ERROR_INVALID_FUNCTION    208 => "E2BIG",             // ERROR_META_EXPANSION_TOO_LONG    10044 => "ESOCKTNOSUPPORT", // WSAESOCKTNOSUPPORT    _ => "",  }}