[INFO] cloning repository https://github.com/kor-and-m/rust-algo [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kor-and-m/rust-algo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkor-and-m%2Frust-algo", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkor-and-m%2Frust-algo'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] aaeab9cd30156819fa8cc6c1595f067eeb454d56 [INFO] testing kor-and-m/rust-algo against master#d98a5da813da67eb189387b8ccfb73cf481275d8+rustflags=-Copt-level=3 for pr-138759-retry [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkor-and-m%2Frust-algo" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'... [INFO] [stderr] done. [INFO] started tweaking git repo https://github.com/kor-and-m/rust-algo [INFO] finished tweaking git repo https://github.com/kor-and-m/rust-algo [INFO] tweaked toml for git repo https://github.com/kor-and-m/rust-algo written to /workspace/builds/worker-0-tc1/source/Cargo.toml [INFO] validating manifest of git repo https://github.com/kor-and-m/rust-algo on toolchain d98a5da813da67eb189387b8ccfb73cf481275d8 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] crate git repo https://github.com/kor-and-m/rust-algo 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" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded rand_hc v0.3.1 [INFO] [stderr] Downloaded more-asserts v0.3.1 [INFO] [stderr] Downloaded getrandom v0.2.4 [INFO] [stderr] Downloaded rand v0.8.4 [INFO] [stderr] Downloaded libc v0.2.116 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] e01414ad1eb54683d9f7e081fe5a70ab737af8fa7090d917e7a57dc3e8554b40 [INFO] running `Command { std: "docker" "start" "-a" "e01414ad1eb54683d9f7e081fe5a70ab737af8fa7090d917e7a57dc3e8554b40", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "e01414ad1eb54683d9f7e081fe5a70ab737af8fa7090d917e7a57dc3e8554b40", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "e01414ad1eb54683d9f7e081fe5a70ab737af8fa7090d917e7a57dc3e8554b40", kill_on_drop: false }` [INFO] [stdout] e01414ad1eb54683d9f7e081fe5a70ab737af8fa7090d917e7a57dc3e8554b40 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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 -Copt-level=3" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] d735c7137a6688c4412050eeb87e02efcca7f2df6644975b0e34047ca8df62fd [INFO] running `Command { std: "docker" "start" "-a" "d735c7137a6688c4412050eeb87e02efcca7f2df6644975b0e34047ca8df62fd", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.116 [INFO] [stderr] Compiling ppv-lite86 v0.2.16 [INFO] [stderr] Compiling graph_representations v0.1.0 (/opt/rustwide/workdir/graph_representations) [INFO] [stderr] Compiling updatable_heap v0.1.0 (/opt/rustwide/workdir/updatable_heap) [INFO] [stderr] Compiling union_find v0.1.0 (/opt/rustwide/workdir/union_find) [INFO] [stderr] Compiling more-asserts v0.3.1 [INFO] [stderr] Compiling quicksort v0.1.0 (/opt/rustwide/workdir/quicksort) [INFO] [stderr] Compiling greedy v0.1.0 (/opt/rustwide/workdir/greedy) [INFO] [stderr] Compiling clustering_algo v0.1.0 (/opt/rustwide/workdir/clustering_algo) [INFO] [stderr] Compiling shortest_path v0.1.0 (/opt/rustwide/workdir/shortest_path) [INFO] [stderr] Compiling bellman_ford v0.1.0 (/opt/rustwide/workdir/bellman_ford) [INFO] [stderr] Compiling dijkstra v0.1.0 (/opt/rustwide/workdir/dijkstra) [INFO] [stderr] Compiling second_max v0.1.0 (/opt/rustwide/workdir/second_max) [INFO] [stderr] Compiling jonsons v0.1.0 (/opt/rustwide/workdir/jonsons) [INFO] [stderr] Compiling dynamic_path_graph v0.1.0 (/opt/rustwide/workdir/dynamic_path_graph) [INFO] [stderr] Compiling median_stream v0.1.0 (/opt/rustwide/workdir/median_stream) [INFO] [stderr] Compiling topological_sort v0.1.0 (/opt/rustwide/workdir/topological_sort) [INFO] [stderr] Compiling unimodal_max v0.1.0 (/opt/rustwide/workdir/unimodal_max) [INFO] [stderr] Compiling huffman v0.1.0 (/opt/rustwide/workdir/huffman) [INFO] [stderr] Compiling inversions_count v0.1.0 (/opt/rustwide/workdir/inversions_count) [INFO] [stderr] Compiling knapsack v0.1.0 (/opt/rustwide/workdir/knapsack) [INFO] [stderr] Compiling element_idx_check v0.1.0 (/opt/rustwide/workdir/element_idx_check) [INFO] [stderr] Compiling binary_search_builder v0.1.0 (/opt/rustwide/workdir/binary_search_builder) [INFO] [stderr] Compiling sorted_n v0.1.0 (/opt/rustwide/workdir/sorted_n) [INFO] [stderr] Compiling strong_components v0.1.0 (/opt/rustwide/workdir/strong_components) [INFO] [stderr] Compiling getrandom v0.2.4 [INFO] [stderr] Compiling rand_core v0.6.3 [INFO] [stderr] Compiling rand_chacha v0.3.1 [INFO] [stderr] Compiling rand v0.8.4 [INFO] [stderr] Compiling min_cut v0.1.0 (/opt/rustwide/workdir/min_cut) [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.17s [INFO] running `Command { std: "docker" "inspect" "d735c7137a6688c4412050eeb87e02efcca7f2df6644975b0e34047ca8df62fd", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "d735c7137a6688c4412050eeb87e02efcca7f2df6644975b0e34047ca8df62fd", kill_on_drop: false }` [INFO] [stdout] d735c7137a6688c4412050eeb87e02efcca7f2df6644975b0e34047ca8df62fd [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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 -Copt-level=3" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] b0543b8874c0e6c22ae5408fc8426e09cbca63d9d05d64fa402de0cfb8712263 [INFO] running `Command { std: "docker" "start" "-a" "b0543b8874c0e6c22ae5408fc8426e09cbca63d9d05d64fa402de0cfb8712263", kill_on_drop: false }` [INFO] [stderr] Compiling updatable_heap v0.1.0 (/opt/rustwide/workdir/updatable_heap) [INFO] [stderr] Compiling graph_representations v0.1.0 (/opt/rustwide/workdir/graph_representations) [INFO] [stderr] Compiling libc v0.2.116 [INFO] [stderr] Compiling cfg-if v1.0.0 [INFO] [stderr] Compiling ppv-lite86 v0.2.16 [INFO] [stderr] Compiling union_find v0.1.0 (/opt/rustwide/workdir/union_find) [INFO] [stderr] Compiling more-asserts v0.3.1 [INFO] [stderr] Compiling topological_sort v0.1.0 (/opt/rustwide/workdir/topological_sort) [INFO] [stderr] Compiling clustering_algo v0.1.0 (/opt/rustwide/workdir/clustering_algo) [INFO] [stderr] Compiling second_max v0.1.0 (/opt/rustwide/workdir/second_max) [INFO] [stderr] Compiling unimodal_max v0.1.0 (/opt/rustwide/workdir/unimodal_max) [INFO] [stderr] Compiling dijkstra v0.1.0 (/opt/rustwide/workdir/dijkstra) [INFO] [stderr] Compiling bellman_ford v0.1.0 (/opt/rustwide/workdir/bellman_ford) [INFO] [stderr] Compiling shortest_path v0.1.0 (/opt/rustwide/workdir/shortest_path) [INFO] [stderr] Compiling jonsons v0.1.0 (/opt/rustwide/workdir/jonsons) [INFO] [stderr] Compiling median_stream v0.1.0 (/opt/rustwide/workdir/median_stream) [INFO] [stderr] Compiling greedy v0.1.0 (/opt/rustwide/workdir/greedy) [INFO] [stderr] Compiling binary_search_builder v0.1.0 (/opt/rustwide/workdir/binary_search_builder) [INFO] [stderr] Compiling knapsack v0.1.0 (/opt/rustwide/workdir/knapsack) [INFO] [stderr] Compiling sorted_n v0.1.0 (/opt/rustwide/workdir/sorted_n) [INFO] [stderr] Compiling inversions_count v0.1.0 (/opt/rustwide/workdir/inversions_count) [INFO] [stderr] Compiling quicksort v0.1.0 (/opt/rustwide/workdir/quicksort) [INFO] [stderr] Compiling strong_components v0.1.0 (/opt/rustwide/workdir/strong_components) [INFO] [stderr] Compiling element_idx_check v0.1.0 (/opt/rustwide/workdir/element_idx_check) [INFO] [stderr] Compiling dynamic_path_graph v0.1.0 (/opt/rustwide/workdir/dynamic_path_graph) [INFO] [stderr] Compiling getrandom v0.2.4 [INFO] [stderr] Compiling huffman v0.1.0 (/opt/rustwide/workdir/huffman) [INFO] [stderr] Compiling rand_core v0.6.3 [INFO] [stderr] Compiling rand_chacha v0.3.1 [INFO] [stderr] Compiling rand v0.8.4 [INFO] [stderr] Compiling min_cut v0.1.0 (/opt/rustwide/workdir/min_cut) [INFO] [stderr] Finished `test` profile [optimized + debuginfo] target(s) in 13.52s [INFO] running `Command { std: "docker" "inspect" "b0543b8874c0e6c22ae5408fc8426e09cbca63d9d05d64fa402de0cfb8712263", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "b0543b8874c0e6c22ae5408fc8426e09cbca63d9d05d64fa402de0cfb8712263", kill_on_drop: false }` [INFO] [stdout] b0543b8874c0e6c22ae5408fc8426e09cbca63d9d05d64fa402de0cfb8712263 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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 -Copt-level=3" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] f60b77b9d01e8bdd8234bebf2a0556a8bc481388f16576ec88c6bde2c70329c8 [INFO] running `Command { std: "docker" "start" "-a" "f60b77b9d01e8bdd8234bebf2a0556a8bc481388f16576ec88c6bde2c70329c8", kill_on_drop: false }` [INFO] [stderr] Finished `test` profile [optimized + debuginfo] target(s) in 0.05s [INFO] [stderr] Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/bellman_ford-71afd208d4b9ab29) [INFO] [stdout] [INFO] [stdout] running 3 tests [INFO] [stdout] test tests::it_works ... ok [INFO] [stdout] test tests::it_works_negative ... ok [INFO] [stdout] test tests::it_works_first ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.44s [INFO] [stdout] [INFO] [stderr] Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/binary_search_builder-0e8e25c535dbed6f) [INFO] [stdout] [INFO] [stdout] running 2 tests [INFO] [stdout] test tests::it_works ... ok [INFO] [stdout] test tests::it_works2 ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] [stderr] Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/clustering_algo-7bf53a2531456a5e) [INFO] [stdout] [INFO] [stdout] running 3 tests [INFO] [stdout] test tests::sould_produce_naighbours ... ok [INFO] [stdout] test tests::sould_work_with_small_input ... ok [INFO] [stdout] test tests::sould_work_with_huge_input ... ok [INFO] [stderr] Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/dijkstra-6ca544206b0eaee7) [INFO] [stdout] [INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 5.18s [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] running 5 tests [INFO] [stdout] test tests::it_works ... ok [INFO] [stdout] test tests::it_works2 ... ok [INFO] [stdout] test tests::it_works3 ... ok [INFO] [stdout] test tests::it_works4 ... ok [INFO] [stdout] test tests::it_works5 ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] [stderr] Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/dynamic_path_graph-beec8a55aea46523) [INFO] [stdout] [INFO] [stdout] running 1 test [INFO] [stdout] test tests::it_works ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] [stderr] Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/element_idx_check-88c76f65e2ddb987) [INFO] [stdout] [INFO] [stdout] running 6 tests [INFO] [stdout] test tests::is_elem_idx_exists_even_test ... ok [INFO] [stdout] test tests::is_elem_idx_exists_first_test ... ok [INFO] [stdout] test tests::is_elem_idx_exists_small_test ... ok [INFO] [stdout] test tests::is_elem_idx_exists_test ... ok [INFO] [stdout] test tests::is_elem_idx_exists_false_test ... ok [INFO] [stdout] test tests::is_elem_idx_exists_last_test ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s [INFO] [stdout] [INFO] [stderr] Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/graph_representations-7d94ddf3747c7545) [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/lib.rs (/opt/rustwide/target/debug/deps/greedy-953346417a9c7817) [INFO] [stdout] [INFO] [stdout] running 3 tests [INFO] [stdout] test tests::prim_works ... ok [INFO] [stdout] test tests::optimal_works ... ok [INFO] [stdout] test tests::non_optimal_works ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s [INFO] [stdout] [INFO] [stderr] Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/huffman-7eb9b4329f85f791) [INFO] [stdout] [INFO] [stdout] running 1 test [INFO] [stdout] test tests::it_works ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s [INFO] [stdout] [INFO] [stderr] Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/inversions_count-fc1ba11082ccc279) [INFO] [stdout] [INFO] [stdout] running 3 tests [INFO] [stdout] test tests::inversions_count_test ... ok [INFO] [stdout] test tests::inversions_count_2_test ... ok [INFO] [stdout] test tests::inversions_count_in_file_test ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.07s [INFO] [stdout] [INFO] [stderr] Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/jonsons-eb114438373caec6) [INFO] [stdout] [INFO] [stdout] running 5 tests [INFO] [stdout] test tests::it_works ... ok [INFO] [stdout] test tests::it_works_second ... ok [INFO] [stdout] test tests::it_works_first ... ok [INFO] [stdout] test tests::it_works_third ... ok [INFO] [stdout] test tests::it_works_huge has been running for over 60 seconds [INFO] [stderr] error: test failed, to rerun pass `-p jonsons --lib` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] process didn't exit successfully: `/opt/rustwide/target/debug/deps/jonsons-eb114438373caec6` (signal: 9, SIGKILL: kill) [INFO] running `Command { std: "docker" "inspect" "f60b77b9d01e8bdd8234bebf2a0556a8bc481388f16576ec88c6bde2c70329c8", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "f60b77b9d01e8bdd8234bebf2a0556a8bc481388f16576ec88c6bde2c70329c8", kill_on_drop: false }` [INFO] [stdout] f60b77b9d01e8bdd8234bebf2a0556a8bc481388f16576ec88c6bde2c70329c8