[INFO] cloning repository https://github.com/aimalygin/xray-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/aimalygin/xray-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faimalygin%2Fxray-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faimalygin%2Fxray-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5834b86d8063bd27788c04b7c7364a7fdb1cecd1
[INFO] checking aimalygin/xray-rust against 8d1a76430406c877b35d0b627e7f796dcf0dfeca+rustflags=-Aunfulfilled-lint-expectations for pr-163637
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faimalygin%2Fxray-rust" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] [stderr] Updating files:  43% (1320/3040)
Updating files:  44% (1338/3040)
Updating files:  45% (1368/3040)
Updating files:  46% (1399/3040)
Updating files:  47% (1429/3040)
Updating files:  48% (1460/3040)
Updating files:  49% (1490/3040)
Updating files:  50% (1520/3040)
Updating files:  51% (1551/3040)
Updating files:  52% (1581/3040)
Updating files:  53% (1612/3040)
Updating files:  54% (1642/3040)
Updating files:  55% (1672/3040)
Updating files:  56% (1703/3040)
Updating files:  57% (1733/3040)
Updating files:  58% (1764/3040)
Updating files:  59% (1794/3040)
Updating files:  60% (1824/3040)
Updating files:  61% (1855/3040)
Updating files:  62% (1885/3040)
Updating files:  63% (1916/3040)
Updating files:  64% (1946/3040)
Updating files:  65% (1976/3040)
Updating files:  66% (2007/3040)
Updating files:  67% (2037/3040)
Updating files:  68% (2068/3040)
Updating files:  69% (2098/3040)
Updating files:  70% (2128/3040)
Updating files:  71% (2159/3040)
Updating files:  72% (2189/3040)
Updating files:  73% (2220/3040)
Updating files:  74% (2250/3040)
Updating files:  75% (2280/3040)
Updating files:  76% (2311/3040)
Updating files:  77% (2341/3040)
Updating files:  78% (2372/3040)
Updating files:  79% (2402/3040)
Updating files:  80% (2432/3040)
Updating files:  81% (2463/3040)
Updating files:  82% (2493/3040)
Updating files:  83% (2524/3040)
Updating files:  84% (2554/3040)
Updating files:  85% (2584/3040)
Updating files:  86% (2615/3040)
Updating files:  87% (2645/3040)
Updating files:  88% (2676/3040)
Updating files:  89% (2706/3040)
Updating files:  90% (2736/3040)
Updating files:  91% (2767/3040)
Updating files:  92% (2797/3040)
Updating files:  93% (2828/3040)
Updating files:  94% (2858/3040)
Updating files:  95% (2888/3040)
Updating files:  96% (2919/3040)
Updating files:  97% (2949/3040)
Updating files:  98% (2980/3040)
Updating files:  99% (3010/3040)
Updating files: 100% (3040/3040)
Updating files: 100% (3040/3040), done.
[INFO] removed /workspace/builds/worker-0-tc1/source/.cargo/config.toml
[INFO] removed /workspace/builds/worker-0-tc1/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/aimalygin/xray-rust
[INFO] finished tweaking git repo https://github.com/aimalygin/xray-rust
[INFO] tweaked toml for git repo https://github.com/aimalygin/xray-rust written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/aimalygin/xray-rust on toolchain 8d1a76430406c877b35d0b627e7f796dcf0dfeca
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8d1a76430406c877b35d0b627e7f796dcf0dfeca" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/aimalygin/xray-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8d1a76430406c877b35d0b627e7f796dcf0dfeca" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/aimalygin/shaped-rustls`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded zstd-safe v8.1.0
[INFO] [stderr]   Downloaded zstd v0.14.2
[INFO] [stderr]   Downloaded sponge-cursor v0.1.0
[INFO] [stderr]   Downloaded module-lattice v0.2.3
[INFO] [stderr]   Downloaded ml-dsa v0.1.1
[INFO] [stderr]   Downloaded shake v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:77db811e55d90add9212f6832c23229e3de5f1c1f9905e8cb07319ea15df73ac" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 130e68cfa6f346e8e11e3a2ea6fdfde491932d18de865760d8c4e52a7d703eb0
[INFO] running `Command { std: "docker" "start" "130e68cfa6f346e8e11e3a2ea6fdfde491932d18de865760d8c4e52a7d703eb0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "130e68cfa6f346e8e11e3a2ea6fdfde491932d18de865760d8c4e52a7d703eb0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "130e68cfa6f346e8e11e3a2ea6fdfde491932d18de865760d8c4e52a7d703eb0" "/opt/rustwide/cargo-home/bin/cargo" "+8d1a76430406c877b35d0b627e7f796dcf0dfeca" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "130e68cfa6f346e8e11e3a2ea6fdfde491932d18de865760d8c4e52a7d703eb0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Aunfulfilled-lint-expectations" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-w" "/opt/rustwide/workdir" "--user" "0:0" "130e68cfa6f346e8e11e3a2ea6fdfde491932d18de865760d8c4e52a7d703eb0" "/opt/rustwide/cargo-home/bin/cargo" "+8d1a76430406c877b35d0b627e7f796dcf0dfeca" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]     Checking typenum v1.20.0
[INFO] [stderr]    Compiling zeroize_derive v1.5.0
[INFO] [stderr]    Compiling syn v3.0.5
[INFO] [stderr]    Compiling tokio-macros v2.7.0
[INFO] [stderr]    Compiling aws-lc-rs v1.18.1
[INFO] [stderr]    Compiling zerocopy v0.8.48
[INFO] [stderr]    Compiling zerocopy-derive v0.8.48
[INFO] [stderr]     Checking aho-corasick v1.1.5
[INFO] [stderr]     Checking keccak v0.2.0
[INFO] [stderr]    Compiling jobserver v0.1.34
[INFO] [stderr]     Checking getrandom v0.2.17
[INFO] [stderr]     Checking errno v0.3.14
[INFO] [stderr]     Checking socket2 v0.6.5
[INFO] [stderr]     Checking mio v1.2.0
[INFO] [stderr]     Checking getrandom v0.4.2
[INFO] [stderr]     Checking constant_time_eq v0.4.2
[INFO] [stderr]    Compiling anyhow v1.0.103
[INFO] [stderr]     Checking signal-hook-registry v1.4.8
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking serde_json v1.0.151
[INFO] [stderr]     Checking uuid v1.28.0
[INFO] [stderr]    Compiling curve25519-dalek v4.1.3
[INFO] [stderr]    Compiling curve25519-dalek-derive v0.1.1
[INFO] [stderr]     Checking xray-utls v0.8.1 (/opt/rustwide/workdir/crates/xray-utls)
[INFO] [stderr]    Compiling synstructure v0.13.2
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling prost-derive v0.14.4
[INFO] [stderr]    Compiling displaydoc v0.2.5
[INFO] [stderr]    Compiling cc v1.2.62
[INFO] [stderr]     Checking tokio v1.53.2
[INFO] [stderr]     Checking zeroize v1.9.1
[INFO] [stderr]    Compiling zerovec-derive v0.11.3
[INFO] [stderr]    Compiling tracing-attributes v0.1.31
[INFO] [stderr]     Checking arrayvec v0.7.8
[INFO] [stderr]     Checking rustls-pki-types v1.14.1
[INFO] [stderr]     Checking alloc-stdlib v0.2.4
[INFO] [stderr]     Checking deranged v0.5.8
[INFO] [stderr]     Checking sponge-cursor v0.1.0
[INFO] [stderr]     Checking brotli-decompressor v5.0.3
[INFO] [stderr]     Checking futures-channel v0.3.32
[INFO] [stderr]    Compiling cmake v0.1.58
[INFO] [stderr]    Compiling zerofrom-derive v0.1.7
[INFO] [stderr]    Compiling yoke-derive v0.8.2
[INFO] [stderr]    Compiling futures-macro v0.3.32
[INFO] [stderr]     Checking x25519-dalek v2.0.1
[INFO] [stderr]    Compiling rustls v0.23.40 (https://github.com/aimalygin/shaped-rustls?rev=3a131beaef0183b0cb61e5a9070a703b6be39ed3#3a131bea)
[INFO] [stderr]     Checking nom v7.1.3
[INFO] [stderr]     Checking brotli v8.0.4
[INFO] [stderr]     Checking regex-automata v0.4.14
[INFO] [stderr]     Checking zlib-rs v0.6.7
[INFO] [stderr]     Checking prost v0.14.4
[INFO] [stderr]    Compiling aws-lc-sys v0.45.0
[INFO] [stderr]     Checking generic-array v0.14.7
[INFO] [stderr]     Checking hybrid-array v0.4.12
[INFO] [stderr]    Compiling blake3 v1.8.5 (/opt/rustwide/workdir/vendor/blake3)
[INFO] [stderr]     Checking crypto-common v0.1.7
[INFO] [stderr]     Checking inout v0.1.4
[INFO] [stderr]     Checking cipher v0.4.4
[INFO] [stderr]     Checking block-buffer v0.10.4
[INFO] [stderr]     Checking universal-hash v0.5.1
[INFO] [stderr]     Checking digest v0.10.7
[INFO] [stderr]     Checking aead v0.5.2
[INFO] [stderr]     Checking poly1305 v0.8.0
[INFO] [stderr]     Checking polyval v0.6.2
[INFO] [stderr]     Checking zerofrom v0.1.8
[INFO] [stderr]     Checking ghash v0.5.1
[INFO] [stderr]     Checking aes v0.8.4
[INFO] [stderr]     Checking ctr v0.9.2
[INFO] [stderr]     Checking chacha20 v0.9.1
[INFO] [stderr]     Checking sha2 v0.10.9
[INFO] [stderr]     Checking yoke v0.8.3
[INFO] [stderr]    Compiling ring v0.17.14
[INFO] [stderr]     Checking tracing v0.1.44
[INFO] [stdout] warning: use of deprecated associated function `core::num::<impl u8>::max_value`: replaced by the `MAX` associated constant on this type
[INFO] [stdout]    --> vendor/blake3/src/platform.rs:437:5
[INFO] [stdout]     |
[INFO] [stdout] 437 |     cpufeatures::new!(has_avx2, "avx2");
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout]     = note: this warning originates in the macro `cpufeatures::new` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `core::num::<impl u8>::max_value`: replaced by the `MAX` associated constant on this type
[INFO] [stdout]    --> vendor/blake3/src/platform.rs:453:5
[INFO] [stdout]     |
[INFO] [stdout] 453 |     cpufeatures::new!(has_sse41, "sse4.1");
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `cpufeatures::new` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `core::num::<impl u8>::max_value`: replaced by the `MAX` associated constant on this type
[INFO] [stdout]    --> vendor/blake3/src/platform.rs:469:5
[INFO] [stdout]     |
[INFO] [stdout] 469 |     cpufeatures::new!(has_sse2, "sse2");
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `cpufeatures::new` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking zerovec v0.11.6
[INFO] [stderr]     Checking time v0.3.47
[INFO] [stderr]     Checking aes-gcm v0.10.3
[INFO] [stderr]     Checking chacha20poly1305 v0.10.1
[INFO] [stderr]     Checking zerotrie v0.2.4
[INFO] [stderr]     Checking futures-util v0.3.32
[INFO] [stdout] warning: use of deprecated associated function `core::num::<impl u64>::max_value`: replaced by the `MAX` associated constant on this type
[INFO] [stdout]     --> vendor/blake3/src/lib.rs:1817:33
[INFO] [stdout]      |
[INFO] [stdout] 1817 |         let max_position = u64::max_value() as i128;
[INFO] [stdout]      |                                 ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling zstd-sys v2.1.1+zstd.1.5.7
[INFO] [stderr]    Compiling asn1-rs-derive v0.6.0
[INFO] [stderr]     Checking crypto-common v0.2.2
[INFO] [stderr]     Checking block-buffer v0.12.1
[INFO] [stderr]    Compiling quinn-udp v0.5.15
[INFO] [stderr]     Checking tinystr v0.8.3
[INFO] [stderr]     Checking icu_locale_core v2.2.0
[INFO] [stderr]     Checking potential_utf v0.1.5
[INFO] [stderr]     Checking chacha20 v0.10.2
[INFO] [stderr]    Compiling asn1-rs-impl v0.2.0
[INFO] [stderr]     Checking icu_collections v2.2.0
[INFO] [stderr]     Checking rusticata-macros v4.1.0
[INFO] [stderr]     Checking serde v1.0.228
[INFO] [stderr]     Checking tinyvec v1.12.0
[INFO] [stderr]     Checking rand v0.10.2
[INFO] [stderr]     Checking digest v0.11.3
[INFO] [stderr]    Compiling quinn v0.11.9 (/opt/rustwide/workdir/vendor/quinn)
[INFO] [stderr]     Checking icu_provider v2.2.0
[INFO] [stderr]     Checking rand_pcg v0.10.2
[INFO] [stderr]     Checking lru-slab v0.1.2
[INFO] [stderr]    Compiling zstd-safe v8.1.0
[INFO] [stderr]    Compiling oid-registry v0.8.1
[INFO] [stderr]     Checking sha3 v0.11.0
[INFO] [stderr]     Checking md-5 v0.11.0
[INFO] [stderr]     Checking shake v0.1.0
[INFO] [stderr]     Checking hmac v0.12.1
[INFO] [stderr]     Checking icu_properties v2.2.0
[INFO] [stderr]     Checking icu_normalizer v2.2.0
[INFO] [stderr] error: could not compile `tokio` (lib)
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/8d1a76430406c877b35d0b627e7f796dcf0dfeca/bin/rustc --crate-name tokio --edition=2021 /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.53.2/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat,unused-externs-silent --crate-type lib --emit=dep-info,metadata -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="bytes"' --cfg 'feature="default"' --cfg 'feature="io-util"' --cfg 'feature="libc"' --cfg 'feature="macros"' --cfg 'feature="mio"' --cfg 'feature="net"' --cfg 'feature="rt"' --cfg 'feature="rt-multi-thread"' --cfg 'feature="signal"' --cfg 'feature="signal-hook-registry"' --cfg 'feature="socket2"' --cfg 'feature="sync"' --cfg 'feature="test-util"' --cfg 'feature="time"' --cfg 'feature="tokio-macros"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("bytes", "default", "fs", "full", "io-std", "io-uring", "io-util", "libc", "macros", "mio", "net", "parking_lot", "process", "rt", "rt-multi-thread", "schedule-latency", "signal", "signal-hook-registry", "socket2", "sync", "taskdump", "test-util", "time", "tokio-macros", "tracing", "windows-sys"))' -C metadata=cf691ac16b1d9368 -C extra-filename=-a5c1277d54ab547e --out-dir /opt/rustwide/target/debug/build/tokio/a5c1277d54ab547e/out -L dependency=/opt/rustwide/target/debug/build/errno/0886ab476cde5bf1/out -L dependency=/opt/rustwide/target/debug/build/libc/651cfb25351828c6/out --extern bytes=/opt/rustwide/target/debug/build/bytes/375dbed4915efc08/out/libbytes-375dbed4915efc08.rmeta --extern libc=/opt/rustwide/target/debug/build/libc/651cfb25351828c6/out/liblibc-651cfb25351828c6.rmeta --extern mio=/opt/rustwide/target/debug/build/mio/53020b65809879b0/out/libmio-53020b65809879b0.rmeta --extern pin_project_lite=/opt/rustwide/target/debug/build/pin-project-lite/d278f58ecc920ca2/out/libpin_project_lite-d278f58ecc920ca2.rmeta --extern signal_hook_registry=/opt/rustwide/target/debug/build/signal-hook-registry/9e91e2b25ce4eb23/out/libsignal_hook_registry-9e91e2b25ce4eb23.rmeta --extern socket2=/opt/rustwide/target/debug/build/socket2/1dea443e238b1c52/out/libsocket2-1dea443e238b1c52.rmeta --extern tokio_macros=/opt/rustwide/target/debug/build/tokio-macros/af8e1532cc92da2d/out/libtokio_macros-af8e1532cc92da2d.so --cap-lints allow --cap-lints=forbid -Aunfulfilled-lint-expectations --force-warn=unused_crate_dependencies` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `brotli` (lib)
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/8d1a76430406c877b35d0b627e7f796dcf0dfeca/bin/rustc --crate-name brotli --edition=2015 /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/brotli-8.0.4/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat,unused-externs-silent --crate-type lib --emit=dep-info,metadata -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="alloc-stdlib"' --cfg 'feature="std"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("alloc-stdlib", "benchmark", "billing", "default", "disable-timer", "disallow_large_window_size", "external-literal-probability", "ffi-api", "float64", "floating_point_context_mixing", "no-stdlib-ffi-binding", "pass-through-ffi-panics", "seccomp", "sha2", "simd", "std", "validation", "vector_scratch_space"))' -C metadata=9749a6871f8d16f0 -C extra-filename=-002189eac4082d4e --out-dir /opt/rustwide/target/debug/build/brotli/002189eac4082d4e/out -L dependency=/opt/rustwide/target/debug/build/alloc-no-stdlib/a014dad0e26a61ee/out -L dependency=/opt/rustwide/target/debug/build/alloc-stdlib/8b84ab4ce5c9aa7d/out --extern alloc_no_stdlib=/opt/rustwide/target/debug/build/alloc-no-stdlib/a014dad0e26a61ee/out/liballoc_no_stdlib-a014dad0e26a61ee.rmeta --extern alloc_stdlib=/opt/rustwide/target/debug/build/alloc-stdlib/8b84ab4ce5c9aa7d/out/liballoc_stdlib-8b84ab4ce5c9aa7d.rmeta --extern brotli_decompressor=/opt/rustwide/target/debug/build/brotli-decompressor/1a5604ab1c704362/out/libbrotli_decompressor-1a5604ab1c704362.rmeta --cap-lints allow --cap-lints=forbid -Aunfulfilled-lint-expectations --force-warn=unused_crate_dependencies` (signal: 9, SIGKILL: kill)
[INFO] running `Command { std: "docker" "inspect" "130e68cfa6f346e8e11e3a2ea6fdfde491932d18de865760d8c4e52a7d703eb0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "130e68cfa6f346e8e11e3a2ea6fdfde491932d18de865760d8c4e52a7d703eb0", kill_on_drop: false }`
[INFO] [stdout] 130e68cfa6f346e8e11e3a2ea6fdfde491932d18de865760d8c4e52a7d703eb0
