[INFO] cloning repository https://github.com/synoet/async_anthropic [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/synoet/async_anthropic" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsynoet%2Fasync_anthropic", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsynoet%2Fasync_anthropic'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] ec20c6aa91ca45161019b7c911a99b5b018e1a64 [INFO] testing synoet/async_anthropic against 1.85.0 for beta-1.86-1 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsynoet%2Fasync_anthropic" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/synoet/async_anthropic on toolchain 1.85.0 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.85.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/synoet/async_anthropic [INFO] finished tweaking git repo https://github.com/synoet/async_anthropic [INFO] tweaked toml for git repo https://github.com/synoet/async_anthropic written to /workspace/builds/worker-4-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/synoet/async_anthropic 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" "+1.85.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded gcp_auth v0.12.3 [INFO] [stderr] Downloaded mockito v1.6.1 [INFO] [stderr] Downloaded reqwest-streams v0.8.2 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/source:/opt/rustwide/workdir:ro,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" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+1.85.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 83d0a951141365efb63530e6debd3d0cbbb3eaad11e2a062e4c28b0e3f23b5b2 [INFO] running `Command { std: "docker" "start" "-a" "83d0a951141365efb63530e6debd3d0cbbb3eaad11e2a062e4c28b0e3f23b5b2", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "83d0a951141365efb63530e6debd3d0cbbb3eaad11e2a062e4c28b0e3f23b5b2", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "83d0a951141365efb63530e6debd3d0cbbb3eaad11e2a062e4c28b0e3f23b5b2", kill_on_drop: false }` [INFO] [stdout] 83d0a951141365efb63530e6debd3d0cbbb3eaad11e2a062e4c28b0e3f23b5b2 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/source:/opt/rustwide/workdir:ro,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" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+1.85.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] a3d2d0a2a401d8d5d2f44e203efd729c78c671853e5897a7ac79773a9889b6eb [INFO] running `Command { std: "docker" "start" "-a" "a3d2d0a2a401d8d5d2f44e203efd729c78c671853e5897a7ac79773a9889b6eb", kill_on_drop: false }` [INFO] [stderr] Compiling proc-macro2 v1.0.92 [INFO] [stderr] Compiling unicode-ident v1.0.14 [INFO] [stderr] Compiling libc v0.2.168 [INFO] [stderr] Compiling autocfg v1.4.0 [INFO] [stderr] Compiling cfg-if v1.0.0 [INFO] [stderr] Compiling pin-project-lite v0.2.15 [INFO] [stderr] Compiling smallvec v1.13.2 [INFO] [stderr] Compiling memchr v2.7.4 [INFO] [stderr] Compiling futures-core v0.3.31 [INFO] [stderr] Compiling bytes v1.9.0 [INFO] [stderr] Compiling parking_lot_core v0.9.10 [INFO] [stderr] Compiling once_cell v1.20.2 [INFO] [stderr] Compiling scopeguard v1.2.0 [INFO] [stderr] Compiling shlex v1.3.0 [INFO] [stderr] Compiling stable_deref_trait v1.2.0 [INFO] [stderr] Compiling futures-sink v0.3.31 [INFO] [stderr] Compiling fnv v1.0.7 [INFO] [stderr] Compiling lock_api v0.4.12 [INFO] [stderr] Compiling slab v0.4.9 [INFO] [stderr] Compiling cc v1.2.4 [INFO] [stderr] Compiling futures-channel v0.3.31 [INFO] [stderr] Compiling futures-task v0.3.31 [INFO] [stderr] Compiling pin-utils v0.1.0 [INFO] [stderr] Compiling futures-io v0.3.31 [INFO] [stderr] Compiling tracing-core v0.1.33 [INFO] [stderr] Compiling writeable v0.5.5 [INFO] [stderr] Compiling litemap v0.7.4 [INFO] [stderr] Compiling quote v1.0.37 [INFO] [stderr] Compiling itoa v1.0.14 [INFO] [stderr] Compiling icu_locid_transform_data v1.5.0 [INFO] [stderr] Compiling icu_properties_data v1.5.0 [INFO] [stderr] Compiling http v1.2.0 [INFO] [stderr] Compiling icu_normalizer_data v1.5.0 [INFO] [stderr] Compiling utf16_iter v1.0.5 [INFO] [stderr] Compiling syn v2.0.90 [INFO] [stderr] Compiling percent-encoding v2.3.1 [INFO] [stderr] Compiling mio v1.0.3 [INFO] [stderr] Compiling signal-hook-registry v1.4.2 [INFO] [stderr] Compiling socket2 v0.5.8 [INFO] [stderr] Compiling parking_lot v0.12.3 [INFO] [stderr] Compiling getrandom v0.2.15 [INFO] [stderr] Compiling utf8_iter v1.0.4 [INFO] [stderr] Compiling write16 v1.0.0 [INFO] [stderr] Compiling form_urlencoded v1.2.1 [INFO] [stderr] Compiling equivalent v1.0.1 [INFO] [stderr] Compiling hashbrown v0.15.2 [INFO] [stderr] Compiling pkg-config v0.3.31 [INFO] [stderr] Compiling serde v1.0.216 [INFO] [stderr] Compiling httparse v1.9.5 [INFO] [stderr] Compiling byteorder v1.5.0 [INFO] [stderr] Compiling vcpkg v0.2.15 [INFO] [stderr] Compiling http-body v1.0.1 [INFO] [stderr] Compiling atomic-waker v1.1.2 [INFO] [stderr] Compiling try-lock v0.2.5 [INFO] [stderr] Compiling want v0.3.1 [INFO] [stderr] Compiling rand_core v0.6.4 [INFO] [stderr] Compiling thiserror v1.0.69 [INFO] [stderr] Compiling indexmap v2.7.0 [INFO] [stderr] Compiling rustls-pki-types v1.10.1 [INFO] [stderr] Compiling httpdate v1.0.3 [INFO] [stderr] Compiling tinyvec_macros v0.1.1 [INFO] [stderr] Compiling tinyvec v1.8.0 [INFO] [stderr] Compiling tower-service v0.3.3 [INFO] [stderr] Compiling ryu v1.0.18 [INFO] [stderr] Compiling serde_json v1.0.133 [INFO] [stderr] Compiling openssl-probe v0.1.5 [INFO] [stderr] Compiling heck v0.5.0 [INFO] [stderr] Compiling ring v0.17.8 [INFO] [stderr] Compiling openssl-sys v0.9.104 [INFO] [stderr] Compiling log v0.4.22 [INFO] [stderr] Compiling foreign-types-shared v0.1.1 [INFO] [stderr] Compiling openssl v0.10.68 [INFO] [stderr] Compiling foreign-types v0.3.2 [INFO] [stderr] Compiling bitflags v2.6.0 [INFO] [stderr] Compiling ipnet v2.10.1 [INFO] [stderr] Compiling match_cfg v0.1.0 [INFO] [stderr] Compiling native-tls v0.2.12 [INFO] [stderr] Compiling data-encoding v2.6.0 [INFO] [stderr] Compiling hostname v0.3.1 [INFO] [stderr] Compiling linked-hash-map v0.5.6 [INFO] [stderr] Compiling spin v0.9.8 [INFO] [stderr] Compiling untrusted v0.9.0 [INFO] [stderr] Compiling ident_case v1.0.1 [INFO] [stderr] Compiling quick-error v1.2.3 [INFO] [stderr] Compiling strsim v0.11.1 [INFO] [stderr] Compiling unicase v2.8.0 [INFO] [stderr] Compiling resolv-conf v0.7.0 [INFO] [stderr] Compiling mime_guess v2.0.5 [INFO] [stderr] Compiling lru-cache v0.1.2 [INFO] [stderr] Compiling base64 v0.22.1 [INFO] [stderr] Compiling rustls v0.23.20 [INFO] [stderr] Compiling rustls-pemfile v2.2.0 [INFO] [stderr] Compiling aho-corasick v1.1.3 [INFO] [stderr] Compiling num-traits v0.2.19 [INFO] [stderr] Compiling subtle v2.6.1 [INFO] [stderr] Compiling regex-syntax v0.8.5 [INFO] [stderr] Compiling mime v0.3.17 [INFO] [stderr] Compiling zeroize v1.8.1 [INFO] [stderr] Compiling unicode-normalization v0.1.24 [INFO] [stderr] Compiling sync_wrapper v1.0.2 [INFO] [stderr] Compiling encoding_rs v0.8.35 [INFO] [stderr] Compiling rustversion v1.0.18 [INFO] [stderr] Compiling synstructure v0.13.1 [INFO] [stderr] Compiling darling_core v0.20.10 [INFO] [stderr] Compiling minimal-lexical v0.2.1 [INFO] [stderr] Compiling unicode-bidi v0.3.17 [INFO] [stderr] Compiling nom v7.1.3 [INFO] [stderr] Compiling idna v0.4.0 [INFO] [stderr] Compiling regex-automata v0.4.9 [INFO] [stderr] Compiling zerofrom-derive v0.1.5 [INFO] [stderr] Compiling yoke-derive v0.7.5 [INFO] [stderr] Compiling tokio-macros v2.4.0 [INFO] [stderr] Compiling zerovec-derive v0.10.3 [INFO] [stderr] Compiling displaydoc v0.2.5 [INFO] [stderr] Compiling futures-macro v0.3.31 [INFO] [stderr] Compiling tracing-attributes v0.1.28 [INFO] [stderr] Compiling tokio v1.42.0 [INFO] [stderr] Compiling icu_provider_macros v1.5.0 [INFO] [stderr] Compiling zerocopy-derive v0.7.35 [INFO] [stderr] Compiling futures-util v0.3.31 [INFO] [stderr] Compiling zerofrom v0.1.5 [INFO] [stderr] Compiling yoke v0.7.5 [INFO] [stderr] Compiling serde_derive v1.0.216 [INFO] [stderr] Compiling zerovec v0.10.4 [INFO] [stderr] Compiling async-trait v0.1.83 [INFO] [stderr] Compiling zerocopy v0.7.35 [INFO] [stderr] Compiling tracing v0.1.41 [INFO] [stderr] Compiling thiserror-impl v1.0.69 [INFO] [stderr] Compiling tinystr v0.7.6 [INFO] [stderr] Compiling icu_locid v1.5.0 [INFO] [stderr] Compiling icu_collections v1.5.0 [INFO] [stderr] Compiling ppv-lite86 v0.2.20 [INFO] [stderr] Compiling icu_provider v1.5.0 [INFO] [stderr] Compiling rand_chacha v0.3.1 [INFO] [stderr] Compiling openssl-macros v0.1.1 [INFO] [stderr] Compiling rand v0.8.5 [INFO] [stderr] Compiling enum-as-inner v0.6.1 [INFO] [stderr] Compiling icu_locid_transform v1.5.0 [INFO] [stderr] Compiling http-body-util v0.1.2 [INFO] [stderr] Compiling darling_macro v0.20.10 [INFO] [stderr] Compiling rustls-webpki v0.102.8 [INFO] [stderr] Compiling futures-executor v0.3.31 [INFO] [stderr] Compiling pin-project-internal v1.1.7 [INFO] [stderr] Compiling futures v0.3.31 [INFO] [stderr] Compiling regex v1.11.1 [INFO] [stderr] Compiling icu_properties v1.5.1 [INFO] [stderr] Compiling tokio-util v0.7.13 [INFO] [stderr] Compiling h2 v0.4.7 [INFO] [stderr] Compiling darling v0.20.10 [INFO] [stderr] Compiling derive_builder_core v0.20.2 [INFO] [stderr] Compiling pin-project v1.1.7 [INFO] [stderr] Compiling rustls-native-certs v0.8.1 [INFO] [stderr] Compiling num_cpus v1.16.0 [INFO] [stderr] Compiling deadpool-runtime v0.1.4 [INFO] [stderr] Compiling anyhow v1.0.94 [INFO] [stderr] Compiling iana-time-zone v0.1.61 [INFO] [stderr] Compiling lazy_static v1.5.0 [INFO] [stderr] Compiling icu_normalizer v1.5.0 [INFO] [stderr] Compiling colored v2.1.0 [INFO] [stderr] Compiling hyper v1.5.1 [INFO] [stderr] Compiling idna_adapter v1.2.0 [INFO] [stderr] Compiling idna v1.0.3 [INFO] [stderr] Compiling url v2.5.4 [INFO] [stderr] Compiling tokio-native-tls v0.3.1 [INFO] [stderr] Compiling serde_urlencoded v0.7.1 [INFO] [stderr] Compiling tokio-rustls v0.26.1 [INFO] [stderr] Compiling chrono v0.4.39 [INFO] [stderr] Compiling hyper-util v0.1.10 [INFO] [stderr] Compiling hickory-proto v0.24.2 [INFO] [stderr] Compiling assert-json-diff v2.0.2 [INFO] [stderr] Compiling trust-dns-proto v0.23.2 [INFO] [stderr] Compiling deadpool v0.10.0 [INFO] [stderr] Compiling derive_builder_macro v0.20.2 [INFO] [stderr] Compiling tracing-futures v0.2.5 [INFO] [stderr] Compiling eventsource-stream v0.2.3 [INFO] [stderr] Compiling hyper-tls v0.6.0 [INFO] [stderr] Compiling hyper-rustls v0.27.3 [INFO] [stderr] Compiling futures-timer v3.0.3 [INFO] [stderr] Compiling similar v2.6.0 [INFO] [stderr] Compiling home v0.5.9 [INFO] [stderr] Compiling gcp_auth v0.12.3 [INFO] [stderr] Compiling strum_macros v0.26.4 [INFO] [stderr] Compiling derive_builder v0.20.2 [INFO] [stderr] Compiling wiremock v0.6.2 [INFO] [stderr] Compiling trust-dns-resolver v0.23.2 [INFO] [stderr] Compiling hickory-resolver v0.24.2 [INFO] [stderr] Compiling mockito v1.6.1 [INFO] [stderr] Compiling tokio-stream v0.1.17 [INFO] [stderr] Compiling reqwest v0.12.9 [INFO] [stderr] Compiling strum v0.26.3 [INFO] [stderr] Compiling reqwest-streams v0.8.2 [INFO] [stderr] Compiling reqwest-eventsource v0.6.0 [INFO] [stderr] Compiling async_anthropic v0.1.0 (/opt/rustwide/workdir) [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 2m 55s [INFO] running `Command { std: "docker" "inspect" "a3d2d0a2a401d8d5d2f44e203efd729c78c671853e5897a7ac79773a9889b6eb", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "a3d2d0a2a401d8d5d2f44e203efd729c78c671853e5897a7ac79773a9889b6eb", kill_on_drop: false }` [INFO] [stdout] a3d2d0a2a401d8d5d2f44e203efd729c78c671853e5897a7ac79773a9889b6eb [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/source:/opt/rustwide/workdir:ro,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" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+1.85.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 0d6013b034d7825b2a5087b030ba3b7f03343c8c3163ab6e3513e9ed47848f15 [INFO] running `Command { std: "docker" "start" "-a" "0d6013b034d7825b2a5087b030ba3b7f03343c8c3163ab6e3513e9ed47848f15", kill_on_drop: false }` [INFO] [stderr] Compiling async_anthropic v0.1.0 (/opt/rustwide/workdir) [INFO] [stderr] Finished `test` profile [unoptimized + debuginfo] target(s) in 2.14s [INFO] running `Command { std: "docker" "inspect" "0d6013b034d7825b2a5087b030ba3b7f03343c8c3163ab6e3513e9ed47848f15", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "0d6013b034d7825b2a5087b030ba3b7f03343c8c3163ab6e3513e9ed47848f15", kill_on_drop: false }` [INFO] [stdout] 0d6013b034d7825b2a5087b030ba3b7f03343c8c3163ab6e3513e9ed47848f15 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/source:/opt/rustwide/workdir:ro,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" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+1.85.0" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] 2b7c16082568e3f5b0be58693515fdb2c8ef94480afc7239c2e79bdfe741d8bb [INFO] running `Command { std: "docker" "start" "-a" "2b7c16082568e3f5b0be58693515fdb2c8ef94480afc7239c2e79bdfe741d8bb", kill_on_drop: false }` [INFO] [stderr] Finished `test` profile [unoptimized + debuginfo] target(s) in 0.29s [INFO] [stderr] Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/async_anthropic-60d281b5cd615a45) [INFO] [stdout] [INFO] [stdout] running 0 tests [INFO] [stdout] [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] [stderr] Doc-tests async_anthropic [INFO] [stdout] [INFO] [stdout] running 0 tests [INFO] [stdout] [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] running `Command { std: "docker" "inspect" "2b7c16082568e3f5b0be58693515fdb2c8ef94480afc7239c2e79bdfe741d8bb", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "2b7c16082568e3f5b0be58693515fdb2c8ef94480afc7239c2e79bdfe741d8bb", kill_on_drop: false }` [INFO] [stdout] 2b7c16082568e3f5b0be58693515fdb2c8ef94480afc7239c2e79bdfe741d8bb