[INFO] cloning repository https://github.com/smartkrio/rtp2wav [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/smartkrio/rtp2wav" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsmartkrio%2Frtp2wav", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsmartkrio%2Frtp2wav'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 00e8eddfc06c9f97ccfbae750dfbe0359d575d3a [INFO] testing smartkrio/rtp2wav against beta-2022-04-10 for beta-1.61-1 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsmartkrio%2Frtp2wav" "/workspace/builds/worker-11/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/smartkrio/rtp2wav on toolchain beta-2022-04-10 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/smartkrio/rtp2wav [INFO] finished tweaking git repo https://github.com/smartkrio/rtp2wav [INFO] tweaked toml for git repo https://github.com/smartkrio/rtp2wav written to /workspace/builds/worker-11/source/Cargo.toml [INFO] crate git repo https://github.com/smartkrio/rtp2wav already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 0d06ba1091b316d1aab4be0a52589e6c1a0d6797e71c85b5788fc9a91446734a [INFO] running `Command { std: "docker" "start" "-a" "0d06ba1091b316d1aab4be0a52589e6c1a0d6797e71c85b5788fc9a91446734a", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "0d06ba1091b316d1aab4be0a52589e6c1a0d6797e71c85b5788fc9a91446734a", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "0d06ba1091b316d1aab4be0a52589e6c1a0d6797e71c85b5788fc9a91446734a", kill_on_drop: false }` [INFO] [stdout] 0d06ba1091b316d1aab4be0a52589e6c1a0d6797e71c85b5788fc9a91446734a [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 9a64225bb8c4eff02e797d1a816687bbe34ff640130e4ea7ad450a2960fcddf8 [INFO] running `Command { std: "docker" "start" "-a" "9a64225bb8c4eff02e797d1a816687bbe34ff640130e4ea7ad450a2960fcddf8", kill_on_drop: false }` [INFO] [stderr] Compiling proc-macro2 v1.0.8 [INFO] [stderr] Compiling unicode-xid v0.2.0 [INFO] [stderr] Compiling syn v1.0.14 [INFO] [stderr] Compiling libc v0.2.66 [INFO] [stderr] Compiling memchr v2.3.0 [INFO] [stderr] Compiling cc v1.0.50 [INFO] [stderr] Compiling byteorder v1.3.2 [INFO] [stderr] Compiling version_check v0.1.5 [INFO] [stderr] Compiling glob v0.3.0 [INFO] [stderr] Compiling rustversion v1.0.2 [INFO] [stderr] Compiling semver-parser v0.7.0 [INFO] [stderr] Compiling unicode-width v0.1.7 [INFO] [stderr] Compiling strsim v0.8.0 [INFO] [stderr] Compiling vec_map v0.8.1 [INFO] [stderr] Compiling ansi_term v0.11.0 [INFO] [stderr] Compiling regex-syntax v0.6.14 [INFO] [stderr] Compiling futures-core v0.3.1 [INFO] [stderr] Compiling bindgen v0.53.1 [INFO] [stderr] Compiling shlex v0.1.1 [INFO] [stderr] Compiling futures-sink v0.3.1 [INFO] [stderr] Compiling error-chain v0.10.0 [INFO] [stderr] Compiling failure_derive v0.1.6 [INFO] [stderr] Compiling lazycell v1.2.1 [INFO] [stderr] Compiling peeking_take_while v0.1.2 [INFO] [stderr] Compiling toml v0.2.1 [INFO] [stderr] Compiling proc-macro-nested v0.1.3 [INFO] [stderr] Compiling ryu v1.0.2 [INFO] [stderr] Compiling futures-task v0.3.1 [INFO] [stderr] Compiling byte-slice-cast v0.3.5 [INFO] [stderr] Compiling futures-io v0.3.1 [INFO] [stderr] Compiling pin-utils v0.1.0-alpha.4 [INFO] [stderr] Compiling fnv v1.0.6 [INFO] [stderr] Compiling serde v1.0.104 [INFO] [stderr] Compiling bytes v0.5.4 [INFO] [stderr] Compiling arc-swap v0.4.4 [INFO] [stderr] Compiling pin-project-lite v0.1.4 [INFO] [stderr] Compiling itoa v0.4.5 [INFO] [stderr] Compiling rtp-rs v0.5.0 [INFO] [stderr] Compiling num-traits v0.2.11 [INFO] [stderr] Compiling num-integer v0.1.42 [INFO] [stderr] Compiling humantime v1.3.0 [INFO] [stderr] Compiling num-bigint v0.2.6 [INFO] [stderr] Compiling num-rational v0.2.3 [INFO] [stderr] Compiling httparse v1.3.4 [INFO] [stderr] Compiling semver v0.9.0 [INFO] [stderr] Compiling futures-channel v0.3.1 [INFO] [stderr] Compiling metadeps v1.1.2 [INFO] [stderr] Compiling textwrap v0.11.0 [INFO] [stderr] Compiling nom v4.2.3 [INFO] [stderr] Compiling http v0.2.0 [INFO] [stderr] Compiling rustc_version v0.2.3 [INFO] [stderr] Compiling clang-sys v0.28.1 [INFO] [stderr] Compiling aho-corasick v0.7.7 [INFO] [stderr] Compiling err-derive v0.1.6 [INFO] [stderr] Compiling rustc-hash v1.0.1 [INFO] [stderr] Compiling riff v0.1.1 [INFO] [stderr] Compiling quote v1.0.2 [INFO] [stderr] Compiling libloading v0.5.2 [INFO] [stderr] Compiling backtrace-sys v0.1.32 [INFO] [stderr] Compiling wav v0.1.1 [INFO] [stderr] Compiling atty v0.2.14 [INFO] [stderr] Compiling iovec v0.1.4 [INFO] [stderr] Compiling which v3.1.0 [INFO] [stderr] Compiling net2 v0.2.33 [INFO] [stderr] Compiling signal-hook-registry v1.2.0 [INFO] [stderr] Compiling num_cpus v1.12.0 [INFO] [stderr] Compiling clap v2.33.0 [INFO] [stderr] Compiling bytes v0.4.12 [INFO] [stderr] Compiling regex v1.3.4 [INFO] [stderr] Compiling cexpr v0.3.6 [INFO] [stderr] Compiling mio v0.6.21 [INFO] [stderr] Compiling backtrace v0.3.43 [INFO] [stderr] Compiling mio-uds v0.6.7 [INFO] [stderr] Compiling env_logger v0.7.1 [INFO] [stderr] Compiling serde_json v1.0.45 [INFO] [stderr] Compiling synstructure v0.12.3 [INFO] [stderr] Compiling syn-mid v0.5.0 [INFO] [stderr] Compiling proc-macro-error v0.2.6 [INFO] [stderr] Compiling proc-macro-hack v0.5.11 [INFO] [stderr] Compiling num-derive v0.3.0 [INFO] [stderr] Compiling tokio-macros v0.2.4 [INFO] [stderr] Compiling serde_derive v1.0.104 [INFO] [stderr] Compiling tokio v0.2.11 [INFO] [stderr] Compiling failure v0.1.6 [INFO] [stderr] Compiling proc-macro-error v0.4.8 [INFO] [stderr] Compiling proc-macro-error-attr v0.4.8 [INFO] [stderr] Compiling av-bitstream v0.1.0 [INFO] [stderr] Compiling futures-macro v0.3.1 [INFO] [stderr] Compiling time-macros-impl v0.1.0 [INFO] [stderr] Compiling av-data v0.2.0 [INFO] [stderr] Compiling opus-sys v0.1.0 (https://github.com/rust-av/opus-rs.git#b653c8b9) [INFO] [stderr] Compiling time-macros v0.1.0 [INFO] [stderr] Compiling av-codec v0.2.0 [INFO] [stderr] Compiling time v0.2.6 [INFO] [stderr] Compiling structopt-derive v0.4.2 [INFO] [stderr] Compiling futures-util v0.3.1 [INFO] [stderr] Compiling tokio-util v0.2.0 [INFO] [stderr] Compiling futures-executor v0.3.1 [INFO] [stderr] Compiling structopt v0.3.9 [INFO] [stderr] Compiling futures v0.3.1 [INFO] [stderr] Compiling libopus v0.1.0 (https://github.com/rust-av/opus-rs.git#b653c8b9) [INFO] [stderr] Compiling rtp2wav v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: warn(rust_2018_idioms) is ignored unless specified at crate level [INFO] [stdout] --> src/server.rs:1:9 [INFO] [stdout] | [INFO] [stdout] 1 | #![warn(rust_2018_idioms)] [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_attributes)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `seconds` [INFO] [stdout] --> src/server.rs:27:5 [INFO] [stdout] | [INFO] [stdout] 27 | seconds: i32, [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] note: `DecodingOpts` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] --> src/server.rs:16:10 [INFO] [stdout] | [INFO] [stdout] 16 | #[derive(Debug, StructOpt)] [INFO] [stdout] | ^^^^^ [INFO] [stdout] = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 23.75s [INFO] running `Command { std: "docker" "inspect" "9a64225bb8c4eff02e797d1a816687bbe34ff640130e4ea7ad450a2960fcddf8", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "9a64225bb8c4eff02e797d1a816687bbe34ff640130e4ea7ad450a2960fcddf8", kill_on_drop: false }` [INFO] [stdout] 9a64225bb8c4eff02e797d1a816687bbe34ff640130e4ea7ad450a2960fcddf8 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 84141257b184a44c2be2a02f786595b8cc1510ccbfedb6dda9d72dd6ca271026 [INFO] running `Command { std: "docker" "start" "-a" "84141257b184a44c2be2a02f786595b8cc1510ccbfedb6dda9d72dd6ca271026", kill_on_drop: false }` [INFO] [stdout] warning: warn(rust_2018_idioms) is ignored unless specified at crate level [INFO] [stdout] --> src/server.rs:1:9 [INFO] [stdout] | [INFO] [stdout] 1 | #![warn(rust_2018_idioms)] [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_attributes)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `seconds` [INFO] [stdout] --> src/server.rs:27:5 [INFO] [stdout] | [INFO] [stdout] 27 | seconds: i32, [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] note: `DecodingOpts` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] --> src/server.rs:16:10 [INFO] [stdout] | [INFO] [stdout] 16 | #[derive(Debug, StructOpt)] [INFO] [stdout] | ^^^^^ [INFO] [stdout] = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Compiling rtp2wav v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: warn(rust_2018_idioms) is ignored unless specified at crate level [INFO] [stdout] --> src/server.rs:1:9 [INFO] [stdout] | [INFO] [stdout] 1 | #![warn(rust_2018_idioms)] [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_attributes)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `seconds` [INFO] [stdout] --> src/server.rs:27:5 [INFO] [stdout] | [INFO] [stdout] 27 | seconds: i32, [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] note: `DecodingOpts` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] --> src/server.rs:16:10 [INFO] [stdout] | [INFO] [stdout] 16 | #[derive(Debug, StructOpt)] [INFO] [stdout] | ^^^^^ [INFO] [stdout] = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.70s [INFO] [stderr] Executable unittests src/lib.rs (/opt/rustwide/target/debug/deps/rtp2wav-c77b99276bebca42) [INFO] [stderr] Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/rtp2wav-998a4775b3fc2cc8) [INFO] running `Command { std: "docker" "inspect" "84141257b184a44c2be2a02f786595b8cc1510ccbfedb6dda9d72dd6ca271026", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "84141257b184a44c2be2a02f786595b8cc1510ccbfedb6dda9d72dd6ca271026", kill_on_drop: false }` [INFO] [stdout] 84141257b184a44c2be2a02f786595b8cc1510ccbfedb6dda9d72dd6ca271026 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] 5f18d5a59e58498becf860bfc1a4698e1b88d7e207b3c4d19850f159ed624c6c [INFO] running `Command { std: "docker" "start" "-a" "5f18d5a59e58498becf860bfc1a4698e1b88d7e207b3c4d19850f159ed624c6c", kill_on_drop: false }` [INFO] [stderr] warning: warn(rust_2018_idioms) is ignored unless specified at crate level [INFO] [stderr] --> src/server.rs:1:9 [INFO] [stderr] | [INFO] [stderr] 1 | #![warn(rust_2018_idioms)] [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_attributes)]` on by default [INFO] [stderr] [INFO] [stderr] warning: field is never read: `seconds` [INFO] [stderr] --> src/server.rs:27:5 [INFO] [stderr] | [INFO] [stderr] 27 | seconds: i32, [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] note: `DecodingOpts` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stderr] --> src/server.rs:16:10 [INFO] [stderr] | [INFO] [stderr] 16 | #[derive(Debug, StructOpt)] [INFO] [stderr] | ^^^^^ [INFO] [stderr] = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stderr] [INFO] [stderr] warning: `rtp2wav` (lib) generated 2 warnings [INFO] [stderr] warning: `rtp2wav` (lib test) generated 2 warnings (2 duplicates) [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 1.24s [INFO] [stderr] Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/rtp2wav-c77b99276bebca42) [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] Running unittests src/main.rs (/opt/rustwide/target/debug/deps/rtp2wav-998a4775b3fc2cc8) [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 rtp2wav [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" "5f18d5a59e58498becf860bfc1a4698e1b88d7e207b3c4d19850f159ed624c6c", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "5f18d5a59e58498becf860bfc1a4698e1b88d7e207b3c4d19850f159ed624c6c", kill_on_drop: false }` [INFO] [stdout] 5f18d5a59e58498becf860bfc1a4698e1b88d7e207b3c4d19850f159ed624c6c