[INFO] fetching crate visor_cli 0.1.0... [INFO] testing visor_cli-0.1.0 against master#c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38 for pr-146098-8 [INFO] extracting crate visor_cli 0.1.0 into /workspace/builds/worker-3-tc1/source [INFO] started tweaking crates.io crate visor_cli 0.1.0 [INFO] finished tweaking crates.io crate visor_cli 0.1.0 [INFO] tweaked toml for crates.io crate visor_cli 0.1.0 written to /workspace/builds/worker-3-tc1/source/Cargo.toml [INFO] validating manifest of crates.io crate visor_cli 0.1.0 on toolchain c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] crate crates.io crate visor_cli 0.1.0 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" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded visor_plugin_log v0.1.0 [INFO] [stderr] Downloaded proc-macro-rules-macros v0.4.0 [INFO] [stderr] Downloaded rand_xorshift v0.2.0 [INFO] [stderr] Downloaded which v6.0.3 [INFO] [stderr] Downloaded swc_visit v2.0.0 [INFO] [stderr] Downloaded swc_macros_common v0.3.13 [INFO] [stderr] Downloaded capacity_builder v0.5.0 [INFO] [stderr] Downloaded cooked-waker v5.0.0 [INFO] [stderr] Downloaded deno_ops v0.228.0 [INFO] [stderr] Downloaded anyhow v1.0.87 [INFO] [stderr] Downloaded wayland-backend v0.3.10 [INFO] [stderr] Downloaded par-core v1.0.4 [INFO] [stderr] Downloaded serde_v8 v0.261.0 [INFO] [stderr] Downloaded bevy_utils v0.14.2 [INFO] [stderr] Downloaded nannou_core v0.19.0 [INFO] [stderr] Downloaded par-iter v1.0.2 [INFO] [stderr] Downloaded gtk v0.18.1 [INFO] [stderr] Downloaded bevy_math v0.14.2 [INFO] [stderr] Downloaded string_enum v1.0.0 [INFO] [stderr] Downloaded nannou_mesh v0.19.0 [INFO] [stderr] Downloaded gdkx11-sys v0.18.0 [INFO] [stderr] Downloaded sys_traits_macros v0.1.0 [INFO] [stderr] Downloaded gtk3-macros v0.18.0 [INFO] [stderr] Downloaded orbclient v0.3.47 [INFO] [stderr] Downloaded bevy_macro_utils v0.14.2 [INFO] [stderr] Downloaded swc_ecma_loader v9.0.0 [INFO] [stderr] Downloaded midly v0.5.3 [INFO] [stderr] Downloaded swc_ecma_lexer v12.0.0 [INFO] [stderr] Downloaded clap_builder v4.5.17 [INFO] [stderr] Downloaded bevy_reflect v0.14.2 [INFO] [stderr] Downloaded swc_macros_common v1.0.0 [INFO] [stderr] Downloaded find_folder v0.3.0 [INFO] [stderr] Downloaded noise v0.7.0 [INFO] [stderr] Downloaded swc_config v3.0.0 [INFO] [stderr] Downloaded icrate v0.0.4 [INFO] [stderr] Downloaded bevy_ptr v0.14.2 [INFO] [stderr] Downloaded clap v4.5.17 [INFO] [stderr] Downloaded visor_plugin_draw v0.1.0 [INFO] [stderr] Downloaded visor_plugin_midi v0.1.0 [INFO] [stderr] Downloaded coremidi v0.8.0 [INFO] [stderr] Downloaded libredox v0.0.2 [INFO] [stderr] Downloaded text_lines v0.6.0 [INFO] [stderr] Downloaded swc_allocator v4.0.0 [INFO] [stderr] Downloaded swc_ecma_codegen v11.0.0 [INFO] [stderr] Downloaded swc_ecma_transforms_macros v1.0.0 [INFO] [stderr] Downloaded psm v0.1.23 [INFO] [stderr] Downloaded bevy_reflect_derive v0.14.2 [INFO] [stderr] Downloaded midir v0.10.1 [INFO] [stderr] Downloaded deno_media_type v0.2.9 [INFO] [stderr] Downloaded swc_ecma_transforms_classes v13.0.0 [INFO] [stderr] Downloaded swc_ecma_transforms_proposal v13.0.0 [INFO] [stderr] Downloaded swc_ecma_parser v12.0.0 [INFO] [stderr] Downloaded capacity_builder_macros v0.3.0 [INFO] [stderr] Downloaded swc_ecma_ast v9.0.0 [INFO] [stderr] Downloaded swc_eq_ignore_macros v1.0.0 [INFO] [stderr] Downloaded is-macro v0.3.6 [INFO] [stderr] Downloaded deno_core_icudata v0.74.0 [INFO] [stderr] Downloaded atk v0.18.0 [INFO] [stderr] Downloaded wasm_dep_analyzer v0.3.0 [INFO] [stderr] Downloaded wayland-protocols-plasma v0.2.0 [INFO] [stderr] Downloaded lyon v0.17.10 [INFO] [stderr] Downloaded block2 v0.3.0 [INFO] [stderr] Downloaded bevy_utils_proc_macros v0.14.2 [INFO] [stderr] Downloaded visor_plugin_math v0.1.0 [INFO] [stderr] Downloaded visor_plugin_state v0.1.0 [INFO] [stderr] Downloaded deno_terminal v0.2.2 [INFO] [stderr] Downloaded swc_ecma_codegen_macros v2.0.0 [INFO] [stderr] Downloaded swc_config_macro v1.0.0 [INFO] [stderr] Downloaded swc_ecma_transforms_typescript v15.0.0 [INFO] [stderr] Downloaded windows-version v0.1.1 [INFO] [stderr] Downloaded deno_error_macro v0.6.1 [INFO] [stderr] Downloaded swc_ecma_transforms_base v13.0.0 [INFO] [stderr] Downloaded swc_common v9.2.0 [INFO] [stderr] Downloaded smithay-client-toolkit v0.18.1 [INFO] [stderr] Downloaded deno_core v0.352.0 [INFO] [stderr] Downloaded swc_ecma_visit v9.0.0 [INFO] [stderr] Downloaded visor_plugin_time v0.1.0 [INFO] [stderr] Downloaded visor_core v0.1.0 [INFO] [stderr] Downloaded wgpu-core v0.21.1 [INFO] [stderr] Downloaded coremidi-sys v3.1.1 [INFO] [stderr] Downloaded dprint-swc-ext v0.24.0 [INFO] [stderr] Downloaded ast_node v3.0.0 [INFO] [stderr] Downloaded calloop v0.12.4 [INFO] [stderr] Downloaded cc v1.1.18 [INFO] [stderr] Downloaded prettyplease v0.2.22 [INFO] [stderr] Downloaded rusttype v0.8.3 [INFO] [stderr] Downloaded swc_atoms v5.0.0 [INFO] [stderr] Downloaded unicode-id v0.3.4 [INFO] [stderr] Downloaded swc_ecma_utils v13.1.0 [INFO] [stderr] Downloaded gtk-sys v0.18.0 [INFO] [stderr] Downloaded lyon_path v0.17.7 [INFO] [stderr] Downloaded visor_nannou_wgpu v0.19.0 [INFO] [stderr] Downloaded naga v0.20.0 [INFO] [stderr] Downloaded metal v0.28.0 [INFO] [stderr] Downloaded wayland-protocols v0.31.2 [INFO] [stderr] Downloaded pennereq v0.3.1 [INFO] [stderr] Downloaded v8 v137.2.0 [INFO] [stderr] Downloaded atk-sys v0.18.0 [INFO] [stderr] Downloaded swc_visit_macros v0.5.13 [INFO] [stderr] Downloaded stb_truetype v0.3.1 [INFO] [stderr] Downloaded deno_unsync v0.4.4 [INFO] [stderr] Downloaded sid v0.6.1 [INFO] [stderr] Downloaded deno_ast v0.48.0 [INFO] [stderr] Downloaded lyon_algorithms v0.17.7 [INFO] [stderr] Downloaded d3d12 v0.20.0 [INFO] [stderr] Downloaded sctk-adwaita v0.8.3 [INFO] [stderr] Downloaded calloop-wayland-source v0.2.0 [INFO] [stderr] Downloaded visor_engine v0.1.0 [INFO] [stderr] Downloaded objc2 v0.6.1 [INFO] [stderr] Downloaded lyon_tessellation v0.17.10 [INFO] [stderr] Downloaded objc2-foundation v0.3.1 [INFO] [stderr] Downloaded swc_ecma_transforms_react v15.0.0 [INFO] [stderr] Downloaded objc2-encode v3.0.0 [INFO] [stderr] Downloaded notosans v0.1.0 [INFO] [stderr] Downloaded from_variant v2.0.0 [INFO] [stderr] Downloaded wgpu-hal v0.21.1 [INFO] [stderr] Downloaded bytemuck v1.18.0 [INFO] [stderr] Downloaded cursor-icon v1.2.0 [INFO] [stderr] Downloaded gpu-descriptor v0.3.2 [INFO] [stderr] Downloaded android-activity v0.5.2 [INFO] [stderr] Downloaded objc2 v0.4.1 [INFO] [stderr] Downloaded winit v0.29.15 [INFO] [stderr] Downloaded hstr v1.1.1 [INFO] [stderr] Downloaded proc-macro-rules v0.4.0 [INFO] [stderr] Downloaded deno_path_util v0.4.0 [INFO] [stderr] Downloaded pluginator v1.0.1 [INFO] [stderr] Downloaded objc2-app-kit v0.3.1 [INFO] [stderr] Downloaded xcursor v0.3.8 [INFO] [stderr] Downloaded wayland-client v0.31.10 [INFO] [stderr] Downloaded deno_error v0.6.1 [INFO] [stderr] Downloaded gdk v0.18.0 [INFO] [stderr] Downloaded objc2-core-foundation v0.3.1 [INFO] [stderr] Downloaded lyon_geom v0.17.7 [INFO] [stderr] Downloaded xml-rs v0.8.21 [INFO] [stderr] Downloaded wgpu v0.20.1 [INFO] [stderr] Downloaded visor_nannou v0.19.0 [INFO] [stderr] Downloaded gdk-sys v0.18.0 [INFO] [stderr] Downloaded sys_traits v0.1.16 [INFO] [stderr] Downloaded arrayref v0.3.8 [INFO] [stderr] Downloaded wayland-cursor v0.31.10 [INFO] [stderr] Downloaded float_next_after v0.1.5 [INFO] [stderr] Downloaded wayland-csd-frame v0.3.0 [INFO] [stderr] Downloaded wayland-protocols-wlr v0.2.0 [INFO] [stderr] Downloaded unicode-xid v0.2.5 [INFO] [stderr] Downloaded block-sys v0.2.1 [INFO] [stderr] Downloaded wgpu-types v0.20.0 [INFO] [stderr] Downloaded gdkwayland-sys v0.18.0 [INFO] [stderr] Downloaded tao v0.34.0 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 3589efab78ddabed5d67336250e54af77f3c32c04ccbfd8ba75d55177514dbbc [INFO] running `Command { std: "docker" "start" "-a" "3589efab78ddabed5d67336250e54af77f3c32c04ccbfd8ba75d55177514dbbc", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "3589efab78ddabed5d67336250e54af77f3c32c04ccbfd8ba75d55177514dbbc", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "3589efab78ddabed5d67336250e54af77f3c32c04ccbfd8ba75d55177514dbbc", kill_on_drop: false }` [INFO] [stdout] 3589efab78ddabed5d67336250e54af77f3c32c04ccbfd8ba75d55177514dbbc [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 924da68276db624ed89f0795150e4409f6f7550606b47d94bcc62e59718d0fdb [INFO] running `Command { std: "docker" "start" "-a" "924da68276db624ed89f0795150e4409f6f7550606b47d94bcc62e59718d0fdb", kill_on_drop: false }` [INFO] [stderr] Compiling proc-macro2 v1.0.95 [INFO] [stderr] Compiling unicode-ident v1.0.12 [INFO] [stderr] Compiling serde v1.0.219 [INFO] [stderr] Compiling smallvec v1.15.1 [INFO] [stderr] Compiling indexmap v2.10.0 [INFO] [stderr] Compiling num-traits v0.2.19 [INFO] [stderr] Compiling either v1.13.0 [INFO] [stderr] Compiling foldhash v0.1.5 [INFO] [stderr] Compiling cc v1.1.18 [INFO] [stderr] Compiling getrandom v0.2.15 [INFO] [stderr] Compiling libloading v0.8.5 [INFO] [stderr] Compiling scoped-tls v1.0.1 [INFO] [stderr] Compiling ahash v0.8.11 [INFO] [stderr] Compiling tracing-core v0.1.32 [INFO] [stderr] Compiling log v0.4.22 [INFO] [stderr] Compiling rustc-hash v2.1.1 [INFO] [stderr] Compiling hashbrown v0.15.2 [INFO] [stderr] Compiling serde_json v1.0.128 [INFO] [stderr] Compiling allocator-api2 v0.2.18 [INFO] [stderr] Compiling cfg-expr v0.15.8 [INFO] [stderr] Compiling rand_core v0.6.4 [INFO] [stderr] Compiling regex-automata v0.4.7 [INFO] [stderr] Compiling slab v0.4.9 [INFO] [stderr] Compiling unicode-width v0.1.13 [INFO] [stderr] Compiling siphasher v0.3.11 [INFO] [stderr] Compiling syn v1.0.109 [INFO] [stderr] Compiling anyhow v1.0.87 [INFO] [stderr] Compiling parking_lot_core v0.9.10 [INFO] [stderr] Compiling phf_shared v0.11.2 [INFO] [stderr] Compiling outref v0.5.2 [INFO] [stderr] Compiling quote v1.0.40 [INFO] [stderr] Compiling phf_generator v0.11.2 [INFO] [stderr] Compiling arrayvec v0.7.6 [INFO] [stderr] Compiling vsimd v0.8.0 [INFO] [stderr] Compiling if_chain v1.0.2 [INFO] [stderr] Compiling unicode-id-start v1.2.0 [INFO] [stderr] Compiling futures-channel v0.3.31 [INFO] [stderr] Compiling num-integer v0.1.46 [INFO] [stderr] Compiling bumpalo v3.16.0 [INFO] [stderr] Compiling syn v2.0.104 [INFO] [stderr] Compiling rustix v0.38.44 [INFO] [stderr] Compiling swc_visit v2.0.0 [INFO] [stderr] Compiling better_scoped_tls v1.0.1 [INFO] [stderr] Compiling linux-raw-sys v0.4.14 [INFO] [stderr] Compiling base64-simd v0.8.0 [INFO] [stderr] Compiling libc v0.2.174 [INFO] [stderr] Compiling parking_lot v0.12.3 [INFO] [stderr] Compiling dlib v0.5.2 [INFO] [stderr] Compiling wayland-sys v0.31.6 [INFO] [stderr] Compiling cfg_aliases v0.1.1 [INFO] [stderr] Compiling downcast-rs v1.2.1 [INFO] [stderr] Compiling quick-xml v0.37.5 [INFO] [stderr] Compiling proc-macro-error-attr v1.0.4 [INFO] [stderr] Compiling smartstring v1.0.1 [INFO] [stderr] Compiling wayland-client v0.31.10 [INFO] [stderr] Compiling bytemuck v1.18.0 [INFO] [stderr] Compiling num_cpus v1.16.0 [INFO] [stderr] Compiling mio v1.0.2 [INFO] [stderr] Compiling socket2 v0.5.7 [INFO] [stderr] Compiling wayland-backend v0.3.10 [INFO] [stderr] Compiling psm v0.1.23 [INFO] [stderr] Compiling stacker v0.1.17 [INFO] [stderr] Compiling signal-hook-registry v1.4.2 [INFO] [stderr] Compiling rustversion v1.0.17 [INFO] [stderr] Compiling bytes v1.7.1 [INFO] [stderr] Compiling glob v0.3.1 [INFO] [stderr] Compiling prettyplease v0.2.22 [INFO] [stderr] Compiling wayland-scanner v0.31.6 [INFO] [stderr] Compiling typed-arena v2.0.2 [INFO] [stderr] Compiling rustix v1.0.7 [INFO] [stderr] Compiling rayon-core v1.12.1 [INFO] [stderr] Compiling par-core v1.0.4 [INFO] [stderr] Compiling semver v1.0.23 [INFO] [stderr] Compiling linux-raw-sys v0.9.4 [INFO] [stderr] Compiling nom v7.1.3 [INFO] [stderr] Compiling par-iter v1.0.2 [INFO] [stderr] Compiling miniz_oxide v0.4.4 [INFO] [stderr] Compiling clang-sys v1.8.1 [INFO] [stderr] Compiling libloading v0.7.4 [INFO] [stderr] Compiling adler32 v1.2.0 [INFO] [stderr] Compiling ash v0.37.3+1.3.251 [INFO] [stderr] Compiling bindgen v0.71.1 [INFO] [stderr] Compiling rustc-hash v1.1.0 [INFO] [stderr] Compiling unicode-id v0.3.4 [INFO] [stderr] Compiling khronos-egl v6.0.0 [INFO] [stderr] Compiling bit-vec v0.6.3 [INFO] [stderr] Compiling gio v0.18.4 [INFO] [stderr] Compiling ryu-js v1.0.1 [INFO] [stderr] Compiling rayon v1.10.0 [INFO] [stderr] Compiling bit-set v0.5.3 [INFO] [stderr] Compiling regex v1.10.6 [INFO] [stderr] Compiling getrandom v0.1.16 [INFO] [stderr] Compiling codespan-reporting v0.11.1 [INFO] [stderr] error: could not compile `regex-automata` (lib) [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38/bin/rustc --crate-name regex_automata --edition=2021 /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/regex-automata-0.4.7/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="alloc"' --cfg 'feature="dfa-onepass"' --cfg 'feature="hybrid"' --cfg 'feature="meta"' --cfg 'feature="nfa-backtrack"' --cfg 'feature="nfa-pikevm"' --cfg 'feature="nfa-thompson"' --cfg 'feature="perf-inline"' --cfg 'feature="perf-literal"' --cfg 'feature="perf-literal-multisubstring"' --cfg 'feature="perf-literal-substring"' --cfg 'feature="std"' --cfg 'feature="syntax"' --cfg 'feature="unicode"' --cfg 'feature="unicode-age"' --cfg 'feature="unicode-bool"' --cfg 'feature="unicode-case"' --cfg 'feature="unicode-gencat"' --cfg 'feature="unicode-perl"' --cfg 'feature="unicode-script"' --cfg 'feature="unicode-segment"' --cfg 'feature="unicode-word-boundary"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("alloc", "default", "dfa", "dfa-build", "dfa-onepass", "dfa-search", "hybrid", "internal-instrument", "internal-instrument-pikevm", "logging", "meta", "nfa", "nfa-backtrack", "nfa-pikevm", "nfa-thompson", "perf", "perf-inline", "perf-literal", "perf-literal-multisubstring", "perf-literal-substring", "std", "syntax", "unicode", "unicode-age", "unicode-bool", "unicode-case", "unicode-gencat", "unicode-perl", "unicode-script", "unicode-segment", "unicode-word-boundary"))' -C metadata=b8067ac70ada1ed2 -C extra-filename=-98d77cb44600a165 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern aho_corasick=/opt/rustwide/target/debug/deps/libaho_corasick-5318fee7af990b33.rmeta --extern memchr=/opt/rustwide/target/debug/deps/libmemchr-3ffe5f7a52883367.rmeta --extern regex_syntax=/opt/rustwide/target/debug/deps/libregex_syntax-3a1fc10fb0bb10d0.rmeta --cap-lints allow --cap-lints=forbid` (signal: 9, SIGKILL: kill) [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] running `Command { std: "docker" "inspect" "924da68276db624ed89f0795150e4409f6f7550606b47d94bcc62e59718d0fdb", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "924da68276db624ed89f0795150e4409f6f7550606b47d94bcc62e59718d0fdb", kill_on_drop: false }` [INFO] [stdout] 924da68276db624ed89f0795150e4409f6f7550606b47d94bcc62e59718d0fdb