[INFO] fetching crate arrow-udf-runtime 0.8.0... [INFO] checking arrow-udf-runtime-0.8.0 against master#51ff895062ba60a7cba53f57af928c3fb7b0f2f4 for pr-146167 [INFO] extracting crate arrow-udf-runtime 0.8.0 into /workspace/builds/worker-6-tc1/source [INFO] started tweaking crates.io crate arrow-udf-runtime 0.8.0 [INFO] removed 0 missing examples [INFO] removed 0 missing tests [INFO] finished tweaking crates.io crate arrow-udf-runtime 0.8.0 [INFO] tweaked toml for crates.io crate arrow-udf-runtime 0.8.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml [INFO] validating manifest of crates.io crate arrow-udf-runtime 0.8.0 on toolchain 51ff895062ba60a7cba53f57af928c3fb7b0f2f4 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+51ff895062ba60a7cba53f57af928c3fb7b0f2f4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] crate crates.io crate arrow-udf-runtime 0.8.0 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" "+51ff895062ba60a7cba53f57af928c3fb7b0f2f4" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded wat v1.222.0 [INFO] [stderr] Downloaded wasmtime-winch v27.0.0 [INFO] [stderr] Downloaded wasmtime-component-util v27.0.0 [INFO] [stderr] Downloaded winch-codegen v27.0.0 [INFO] [stderr] Downloaded wasmtime-environ v27.0.0 [INFO] [stderr] Downloaded genawaiter2-macro v0.100.1 [INFO] [stderr] Downloaded atomic-time v0.1.5 [INFO] [stderr] Downloaded prost-types v0.13.3 [INFO] [stderr] Downloaded genawaiter2 v0.100.1 [INFO] [stderr] Downloaded rquickjs-core v0.6.2 [INFO] [stderr] Downloaded arrow-flight v54.3.1 [INFO] [stderr] Downloaded axum v0.7.7 [INFO] [stderr] Downloaded wast v35.0.2 [INFO] [stderr] Downloaded wasmtime-cranelift v27.0.0 [INFO] [stderr] Downloaded cranelift-isle v0.114.0 [INFO] [stderr] Downloaded cap-primitives v3.4.2 [INFO] [stderr] Downloaded toml_edit v0.22.21 [INFO] [stderr] Downloaded cpp_demangle v0.4.4 [INFO] [stderr] Downloaded wasmparser v0.219.1 [INFO] [stderr] Downloaded pyo3-ffi v0.24.1 [INFO] [stderr] Downloaded cranelift-codegen v0.114.0 [INFO] [stderr] Downloaded wasmtime-cache v27.0.0 [INFO] [stderr] Downloaded wit-parser v0.219.1 [INFO] [stderr] Downloaded wasmtime-component-macro v27.0.0 [INFO] [stderr] Downloaded cranelift-codegen-meta v0.114.0 [INFO] [stderr] Downloaded regalloc2 v0.10.2 [INFO] [stderr] Downloaded pyo3-macros-backend v0.24.1 [INFO] [stderr] Downloaded wasi-common v27.0.0 [INFO] [stderr] Downloaded rquickjs-macro v0.6.2 [INFO] [stderr] Downloaded cap-rand v3.4.2 [INFO] [stderr] Downloaded cap-fs-ext v3.4.2 [INFO] [stderr] Downloaded ittapi-sys v0.4.0 [INFO] [stderr] Downloaded fs-set-times v0.20.1 [INFO] [stderr] Downloaded cap-std v3.4.2 [INFO] [stderr] Downloaded winx v0.36.3 [INFO] [stderr] Downloaded system-interface v0.27.2 [INFO] [stderr] Downloaded wiggle v27.0.0 [INFO] [stderr] Downloaded dissimilar v1.0.9 [INFO] [stderr] Downloaded rquickjs v0.6.2 [INFO] [stderr] Downloaded hyper-timeout v0.5.1 [INFO] [stderr] Downloaded ipnet v2.10.0 [INFO] [stderr] Downloaded io-lifetimes v2.0.3 [INFO] [stderr] Downloaded fxprof-processed-profile v0.6.0 [INFO] [stderr] Downloaded wasmtime-jit-debug v27.0.0 [INFO] [stderr] Downloaded rquickjs-sys v0.6.2 [INFO] [stderr] Downloaded wasmtime-versioned-export-macros v27.0.0 [INFO] [stderr] Downloaded cranelift-entity v0.114.0 [INFO] [stderr] Downloaded expect-test v1.5.0 [INFO] [stderr] Downloaded syn-mid v0.5.4 [INFO] [stderr] Downloaded proc-macro-error-attr v0.4.12 [INFO] [stderr] Downloaded genawaiter2-proc-macro v0.100.1 [INFO] [stderr] Downloaded prost-derive v0.13.3 [INFO] [stderr] Downloaded prost v0.13.3 [INFO] [stderr] Downloaded shellexpand v2.1.2 [INFO] [stderr] Downloaded witx v0.9.1 [INFO] [stderr] Downloaded wiggle-generate v27.0.0 [INFO] [stderr] Downloaded memfd v0.6.4 [INFO] [stderr] Downloaded pulley-interpreter v27.0.0 [INFO] [stderr] Downloaded sptr v0.3.2 [INFO] [stderr] Downloaded wasmtime-wit-bindgen v27.0.0 [INFO] [stderr] Downloaded wasmtime-asm-macros v27.0.0 [INFO] [stderr] Downloaded wasmtime-jit-icache-coherence v27.0.0 [INFO] [stderr] Downloaded wasmtime-slab v27.0.0 [INFO] [stderr] Downloaded cranelift-frontend v0.114.0 [INFO] [stderr] Downloaded cranelift-bforest v0.114.0 [INFO] [stderr] Downloaded cranelift-codegen-shared v0.114.0 [INFO] [stderr] Downloaded pyo3 v0.24.1 [INFO] [stderr] Downloaded cranelift-native v0.114.0 [INFO] [stderr] Downloaded cranelift-bitset v0.114.0 [INFO] [stderr] Downloaded postcard v1.0.10 [INFO] [stderr] Downloaded wasm-encoder v0.219.1 [INFO] [stderr] Downloaded wasmprinter v0.219.1 [INFO] [stderr] Downloaded wasmtime v27.0.0 [INFO] [stderr] Downloaded proc-macro-error v0.4.12 [INFO] [stderr] Downloaded mockito v1.7.0 [INFO] [stderr] Downloaded pyo3-macros v0.24.1 [INFO] [stderr] Downloaded pyo3-build-config v0.24.1 [INFO] [stderr] Downloaded cap-time-ext v3.4.2 [INFO] [stderr] Downloaded wiggle-macro v27.0.0 [INFO] [stderr] Downloaded ittapi v0.4.0 [INFO] [stderr] Downloaded psm v0.1.23 [INFO] [stderr] Downloaded id-arena v2.2.1 [INFO] [stderr] Downloaded wasmtime-fiber v27.0.0 [INFO] [stderr] Downloaded cranelift-control v0.114.0 [INFO] [stderr] Downloaded wasmparser v0.222.0 [INFO] [stderr] Downloaded wasm-encoder v0.222.0 [INFO] [stderr] Downloaded wast v222.0.0 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+51ff895062ba60a7cba53f57af928c3fb7b0f2f4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] a670b21095620debd978940142e155b437c6614287fa9f68e53e1684fcbf3669 [INFO] running `Command { std: "docker" "start" "-a" "a670b21095620debd978940142e155b437c6614287fa9f68e53e1684fcbf3669", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "a670b21095620debd978940142e155b437c6614287fa9f68e53e1684fcbf3669", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "a670b21095620debd978940142e155b437c6614287fa9f68e53e1684fcbf3669", kill_on_drop: false }` [INFO] [stdout] a670b21095620debd978940142e155b437c6614287fa9f68e53e1684fcbf3669 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+51ff895062ba60a7cba53f57af928c3fb7b0f2f4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] ad19a9added6b39fd90ea230fd68a5fd9a0b4805e2750408428dd51b5eb70f5c [INFO] running `Command { std: "docker" "start" "-a" "ad19a9added6b39fd90ea230fd68a5fd9a0b4805e2750408428dd51b5eb70f5c", kill_on_drop: false }` [INFO] [stderr] Compiling proc-macro2 v1.0.94 [INFO] [stderr] Compiling unicode-ident v1.0.13 [INFO] [stderr] Compiling serde v1.0.210 [INFO] [stderr] Checking bytes v1.7.2 [INFO] [stderr] Compiling anyhow v1.0.89 [INFO] [stderr] Checking log v0.4.22 [INFO] [stderr] Compiling ahash v0.8.11 [INFO] [stderr] Compiling num-traits v0.2.19 [INFO] [stderr] Compiling libc v0.2.169 [INFO] [stderr] Compiling target-lexicon v0.13.2 [INFO] [stderr] Checking getrandom v0.2.15 [INFO] [stderr] Compiling rustix v0.38.42 [INFO] [stderr] Checking socket2 v0.5.7 [INFO] [stderr] Checking mio v0.8.11 [INFO] [stderr] Compiling serde_json v1.0.128 [INFO] [stderr] Compiling cranelift-isle v0.114.0 [INFO] [stderr] Compiling cranelift-codegen-shared v0.114.0 [INFO] [stderr] Compiling target-lexicon v0.12.16 [INFO] [stderr] Compiling io-lifetimes v2.0.3 [INFO] [stderr] Compiling syn v1.0.109 [INFO] [stderr] Compiling cranelift-codegen-meta v0.114.0 [INFO] [stderr] Compiling zerocopy v0.7.35 [INFO] [stderr] Checking bumpalo v3.16.0 [INFO] [stderr] Checking litemap v0.7.5 [INFO] [stderr] Compiling icu_locid_transform_data v1.5.1 [INFO] [stderr] Checking http v1.1.0 [INFO] [stderr] Compiling semver v1.0.23 [INFO] [stderr] Compiling rustversion v1.0.17 [INFO] [stderr] Compiling jobserver v0.1.32 [INFO] [stderr] Checking slice-group-by v0.3.1 [INFO] [stderr] Checking arbitrary v1.3.2 [INFO] [stderr] Compiling io-extras v0.18.4 [INFO] [stderr] Compiling pyo3-build-config v0.24.1 [INFO] [stderr] Compiling icu_properties_data v1.5.1 [INFO] [stderr] Compiling cc v1.2.18 [INFO] [stderr] Compiling quote v1.0.37 [INFO] [stderr] Checking num-integer v0.1.46 [INFO] [stderr] Checking num-complex v0.4.6 [INFO] [stderr] Checking half v2.4.1 [INFO] [stderr] Compiling hashbrown v0.14.5 [INFO] [stderr] Checking num-bigint v0.4.6 [INFO] [stderr] Checking num-iter v0.1.45 [INFO] [stderr] Checking lexical-util v1.0.3 [INFO] [stderr] Checking cranelift-control v0.114.0 [INFO] [stderr] Checking rand_core v0.6.4 [INFO] [stderr] Compiling syn v2.0.100 [INFO] [stderr] Checking crc32fast v1.4.2 [INFO] [stderr] Compiling wasm-encoder v0.222.0 [INFO] [stderr] Compiling bitflags v2.6.0 [INFO] [stderr] Checking either v1.13.0 [INFO] [stderr] Compiling icu_normalizer_data v1.5.1 [INFO] [stderr] Checking cobs v0.2.3 [INFO] [stderr] Checking ipnet v2.10.0 [INFO] [stderr] Compiling cap-primitives v3.4.2 [INFO] [stderr] Compiling cpp_demangle v0.4.4 [INFO] [stderr] Checking ambient-authority v0.0.2 [INFO] [stderr] Checking num-rational v0.4.2 [INFO] [stderr] Checking crypto-common v0.1.6 [INFO] [stderr] Checking http-body v1.0.1 [INFO] [stderr] Compiling dirs-sys v0.3.7 [INFO] [stderr] Compiling leb128 v0.2.5 [INFO] [stderr] Checking maybe-owned v0.3.4 [INFO] [stderr] Checking winnow v0.6.18 [INFO] [stderr] Compiling id-arena v2.2.1 [INFO] [stderr] Checking num v0.4.3 [INFO] [stderr] Compiling unicode-xid v0.2.5 [INFO] [stderr] Checking arrow-schema v54.3.1 [INFO] [stderr] Checking arrow-buffer v54.3.1 [INFO] [stderr] Compiling openssl v0.10.72 [INFO] [stderr] Compiling wast v35.0.2 [INFO] [stderr] Compiling dirs v4.0.0 [INFO] [stderr] Checking digest v0.10.7 [INFO] [stderr] Checking chrono v0.4.40 [INFO] [stderr] Checking wasm-encoder v0.219.1 [INFO] [stderr] Checking arrow-data v54.3.1 [INFO] [stderr] Compiling rustc_version v0.4.1 [INFO] [stderr] Checking concurrent-queue v2.5.0 [INFO] [stderr] Compiling zstd-sys v2.0.13+zstd.1.5.6 [INFO] [stderr] Compiling openssl-sys v0.9.107 [INFO] [stderr] Compiling rquickjs-sys v0.6.2 [INFO] [stderr] Compiling ittapi-sys v0.4.0 [INFO] [stderr] Checking dirs-sys-next v0.1.2 [INFO] [stderr] Checking sync_wrapper v1.0.1 [INFO] [stderr] Compiling proc-macro-error-attr v0.4.12 [INFO] [stderr] Checking uuid v1.10.0 [INFO] [stderr] Compiling wasmtime-component-macro v27.0.0 [INFO] [stderr] Compiling indexmap v2.7.0 [INFO] [stderr] Checking cpufeatures v0.2.14 [INFO] [stderr] Compiling wasmtime-cache v27.0.0 [INFO] [stderr] Compiling cap-std v3.4.2 [INFO] [stderr] Checking wasmtime-component-util v27.0.0 [INFO] [stderr] Compiling getrandom v0.3.2 [INFO] [stderr] Compiling native-tls v0.2.14 [INFO] [stderr] Checking event-listener v5.4.0 [INFO] [stderr] Compiling cranelift-codegen v0.114.0 [INFO] [stderr] Checking debugid v0.8.0 [INFO] [stderr] Checking sha2 v0.10.8 [INFO] [stderr] Checking wast v222.0.0 [INFO] [stderr] Compiling pyo3-ffi v0.24.1 [INFO] [stderr] Compiling pyo3-macros-backend v0.24.1 [INFO] [stderr] Checking directories-next v2.0.0 [INFO] [stderr] Compiling flatbuffers v24.12.23 [INFO] [stderr] Compiling shellexpand v2.1.2 [INFO] [stderr] Checking itertools v0.12.1 [INFO] [stderr] Checking lexical-parse-integer v1.0.2 [INFO] [stderr] Checking lexical-write-integer v1.0.2 [INFO] [stderr] Checking wasmtime-asm-macros v27.0.0 [INFO] [stderr] Compiling proc-macro-error v0.4.12 [INFO] [stderr] Checking encoding_rs v0.8.33 [INFO] [stderr] Compiling wiggle-macro v27.0.0 [INFO] [stderr] Checking lexical-parse-float v1.0.2 [INFO] [stderr] Checking lexical-write-float v1.0.2 [INFO] [stderr] Compiling wasmparser v0.219.1 [INFO] [stderr] Compiling toml_edit v0.19.15 [INFO] [stderr] Checking ittapi v0.4.0 [INFO] [stderr] Checking rayon v1.10.0 [INFO] [stderr] Compiling proc-macro-error-attr v1.0.4 [INFO] [stderr] Checking event-listener-strategy v0.5.4 [INFO] [stderr] Checking wasmtime-jit-icache-coherence v27.0.0 [INFO] [stderr] Checking strum v0.26.3 [INFO] [stderr] Compiling relative-path v1.9.3 [INFO] [stderr] Checking wasmtime-slab v27.0.0 [INFO] [stderr] Compiling portable-atomic v1.7.0 [INFO] [stderr] Compiling system-interface v0.27.2 [INFO] [stderr] Compiling syn-mid v0.5.4 [INFO] [stderr] Checking sptr v0.3.2 [INFO] [stderr] Compiling zerocopy v0.8.24 [INFO] [stderr] Compiling cap-fs-ext v3.4.2 [INFO] [stderr] Checking unicode-width v0.1.13 [INFO] [stderr] Compiling synstructure v0.13.1 [INFO] [stderr] Compiling convert_case v0.6.0 [INFO] [stderr] Compiling proc-macro-error v1.0.4 [INFO] [stderr] Checking rand_core v0.9.3 [INFO] [stderr] Checking async-lock v3.4.0 [INFO] [stderr] Checking lexical-core v1.0.2 [INFO] [stderr] Compiling pyo3 v0.24.1 [INFO] [stderr] Checking fs-set-times v0.20.1 [INFO] [stderr] Checking memfd v0.6.4 [INFO] [stderr] Checking atoi v2.0.0 [INFO] [stderr] Checking aho-corasick v1.1.3 [INFO] [stderr] Checking futures-io v0.3.30 [INFO] [stderr] Checking rustls-pki-types v1.11.0 [INFO] [stderr] Checking regex-syntax v0.8.4 [INFO] [stderr] Checking rustls-pemfile v2.2.0 [INFO] [stderr] Compiling proc-macro-crate v1.3.1 [INFO] [stderr] Checking cap-time-ext v3.4.2 [INFO] [stderr] Compiling arrow-udf-runtime v0.8.0 (/opt/rustwide/workdir) [INFO] [stderr] Checking unindent v0.2.3 [INFO] [stderr] Compiling indoc v2.0.5 [INFO] [stderr] Checking genawaiter2-macro v0.100.1 [INFO] [stderr] Checking regex-automata v0.4.7 [INFO] [stderr] Checking fastrand v2.1.1 [INFO] [stderr] Checking atomic-time v0.1.5 [INFO] [stderr] Checking itertools v0.14.0 [INFO] [stderr] Compiling serde_derive v1.0.210 [INFO] [stderr] Compiling zerocopy-derive v0.7.35 [INFO] [stderr] Compiling futures-macro v0.3.30 [INFO] [stderr] Compiling tokio-macros v2.2.0 [INFO] [stderr] Compiling zerofrom-derive v0.1.6 [INFO] [stderr] Compiling yoke-derive v0.7.5 [INFO] [stderr] Compiling tracing-attributes v0.1.27 [INFO] [stderr] Compiling zerovec-derive v0.10.3 [INFO] [stderr] Compiling displaydoc v0.2.5 [INFO] [stderr] Checking futures-util v0.3.30 [INFO] [stderr] Compiling wasmtime-versioned-export-macros v27.0.0 [INFO] [stderr] Checking zerofrom v0.1.6 [INFO] [stderr] Checking yoke v0.7.5 [INFO] [stderr] error: could not compile `wasmparser` (lib) [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/51ff895062ba60a7cba53f57af928c3fb7b0f2f4/bin/rustc --crate-name wasmparser --edition=2021 /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/wasmparser-0.219.1/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 '--allow=clippy::all' --deny=unsafe_code '--warn=clippy::unnecessary_to_owned' '--warn=clippy::map_clone' '--warn=clippy::manual_strip' '--warn=clippy::clone_on_copy' --cfg 'feature="component-model"' --cfg 'feature="std"' --cfg 'feature="validate"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("component-model", "default", "features", "no-hash-maps", "serde", "std", "validate"))' -C metadata=b3cf1b60d91257fb -C extra-filename=-d5bf0dbb5a3a34a8 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern ahash=/opt/rustwide/target/debug/deps/libahash-9582be6ba3c79041.rmeta --extern bitflags=/opt/rustwide/target/debug/deps/libbitflags-8257de363ef7afb0.rmeta --extern hashbrown=/opt/rustwide/target/debug/deps/libhashbrown-386e66bd7a1e537a.rmeta --extern indexmap=/opt/rustwide/target/debug/deps/libindexmap-366b8f0181c7f6fc.rmeta --extern semver=/opt/rustwide/target/debug/deps/libsemver-b12fe2c067278efd.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" "ad19a9added6b39fd90ea230fd68a5fd9a0b4805e2750408428dd51b5eb70f5c", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "ad19a9added6b39fd90ea230fd68a5fd9a0b4805e2750408428dd51b5eb70f5c", kill_on_drop: false }` [INFO] [stdout] ad19a9added6b39fd90ea230fd68a5fd9a0b4805e2750408428dd51b5eb70f5c