[INFO] cloning repository https://github.com/CTJeffries/Fives [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/CTJeffries/Fives" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCTJeffries%2FFives", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCTJeffries%2FFives'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 75f3eedb1a513167c6d1cc36c89a0edaadde09e7 [INFO] testing CTJeffries/Fives against beta-2021-09-08 for beta-1.56-1 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCTJeffries%2FFives" "/workspace/builds/worker-59/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-59/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/CTJeffries/Fives on toolchain beta-2021-09-08 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/CTJeffries/Fives [INFO] finished tweaking git repo https://github.com/CTJeffries/Fives [INFO] tweaked toml for git repo https://github.com/CTJeffries/Fives written to /workspace/builds/worker-59/source/Cargo.toml [INFO] crate git repo https://github.com/CTJeffries/Fives already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded token_store v0.1.2 [INFO] [stderr] Downloaded wayland-window v0.13.3 [INFO] [stderr] Downloaded piston2d-graphics v0.26.0 [INFO] [stderr] Downloaded wayland-protocols v0.12.5 [INFO] [stderr] Downloaded pkg-config v0.3.12 [INFO] [stderr] Downloaded piston-viewport v0.3.0 [INFO] [stderr] Downloaded serde_derive v1.0.70 [INFO] [stderr] Downloaded cocoa v0.14.0 [INFO] [stderr] Downloaded core-graphics v0.13.0 [INFO] [stderr] Downloaded wayland-scanner v0.12.5 [INFO] [stderr] Downloaded ordered-float v0.5.0 [INFO] [stderr] Downloaded cc v1.0.18 [INFO] [stderr] Downloaded rusttype v0.4.3 [INFO] [stderr] Downloaded wayland-kbd v0.13.1 [INFO] [stderr] Downloaded stb_truetype v0.2.2 [INFO] [stderr] Downloaded gl v0.10.0 [INFO] [stderr] Downloaded serde v1.0.70 [INFO] [stderr] Downloaded piston2d-opengl_graphics v0.53.0 [INFO] [stderr] Downloaded wayland-client v0.12.5 [INFO] [stderr] Downloaded winit v0.12.0 [INFO] [stderr] Downloaded proc-macro2 v0.4.9 [INFO] [stderr] Downloaded lazy_static v1.0.2 [INFO] [stderr] Downloaded wayland-sys v0.12.5 [INFO] [stderr] Downloaded glutin v0.14.0 [INFO] [stderr] Downloaded pistoncore-glutin_window v0.47.0 [INFO] [stderr] Downloaded quote v0.6.4 [INFO] [stderr] Downloaded pistoncore-event_loop v0.37.0 [INFO] [stderr] Downloaded pistoncore-window v0.32.0 [INFO] [stderr] Downloaded piston v0.37.0 [INFO] [stderr] Downloaded pistoncore-input v0.21.0 [INFO] [stderr] Downloaded x11-dl v2.18.1 [INFO] [stderr] Downloaded syn v0.14.5 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-59/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-59/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 9a5dcf3904ccb98215b268a8247131a9cf778737ee8d51ffffbbdebb5728792b [INFO] running `Command { std: "docker" "start" "-a" "9a5dcf3904ccb98215b268a8247131a9cf778737ee8d51ffffbbdebb5728792b", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "9a5dcf3904ccb98215b268a8247131a9cf778737ee8d51ffffbbdebb5728792b", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "9a5dcf3904ccb98215b268a8247131a9cf778737ee8d51ffffbbdebb5728792b", kill_on_drop: false }` [INFO] [stdout] 9a5dcf3904ccb98215b268a8247131a9cf778737ee8d51ffffbbdebb5728792b [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-59/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-59/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] ac99aeaeea0310246b48699dc21e7c92ffc271917e4b80d89af1183afe4c534b [INFO] running `Command { std: "docker" "start" "-a" "ac99aeaeea0310246b48699dc21e7c92ffc271917e4b80d89af1183afe4c534b", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Compiling bitflags v1.0.3 [INFO] [stderr] Compiling libc v0.2.42 [INFO] [stderr] Compiling lazy_static v1.0.2 [INFO] [stderr] Compiling cfg-if v0.1.4 [INFO] [stderr] Compiling num-traits v0.2.5 [INFO] [stderr] Compiling cc v1.0.18 [INFO] [stderr] Compiling unicode-xid v0.1.0 [INFO] [stderr] Compiling khronos_api v2.2.0 [INFO] [stderr] Compiling nodrop v0.1.12 [INFO] [stderr] Compiling piston-float v0.3.0 [INFO] [stderr] Compiling byteorder v1.2.3 [INFO] [stderr] Compiling rayon-core v1.4.1 [INFO] [stderr] Compiling num-integer v0.1.39 [INFO] [stderr] Compiling scopeguard v0.3.3 [INFO] [stderr] Compiling token_store v0.1.2 [INFO] [stderr] Compiling serde v1.0.70 [INFO] [stderr] Compiling memoffset v0.2.1 [INFO] [stderr] Compiling pkg-config v0.3.12 [INFO] [stderr] Compiling rand_core v0.2.1 [INFO] [stderr] Compiling num-iter v0.1.37 [INFO] [stderr] Compiling remove_dir_all v0.5.1 [INFO] [stderr] Compiling adler32 v1.0.3 [INFO] [stderr] Compiling rayon v1.0.2 [INFO] [stderr] Compiling shader_version v0.3.0 [INFO] [stderr] Compiling either v1.5.0 [INFO] [stderr] Compiling lzw v0.10.0 [INFO] [stderr] Compiling color_quant v1.0.1 [INFO] [stderr] Compiling percent-encoding v1.0.1 [INFO] [stderr] Compiling piston-texture v0.6.0 [INFO] [stderr] Compiling scoped_threadpool v0.1.9 [INFO] [stderr] Compiling read_color v1.0.0 [INFO] [stderr] Compiling fnv v1.0.6 [INFO] [stderr] Compiling interpolation v0.1.0 [INFO] [stderr] Compiling piston-shaders_graphics2d v0.3.1 [INFO] [stderr] Compiling unreachable v0.1.1 [INFO] [stderr] Compiling log v0.4.3 [INFO] [stderr] Compiling crossbeam-utils v0.2.2 [INFO] [stderr] Compiling xml-rs v0.7.0 [INFO] [stderr] Compiling piston-viewport v0.3.0 [INFO] [stderr] Compiling vecmath v0.3.1 [INFO] [stderr] Compiling inflate v0.4.3 [INFO] [stderr] Compiling proc-macro2 v0.4.9 [INFO] [stderr] Compiling stb_truetype v0.2.2 [INFO] [stderr] Compiling deflate v0.7.18 [INFO] [stderr] Compiling arrayvec v0.4.7 [INFO] [stderr] Compiling rand v0.5.4 [INFO] [stderr] Compiling memmap v0.6.2 [INFO] [stderr] Compiling num_cpus v1.8.0 [INFO] [stderr] Compiling shared_library v0.1.9 [INFO] [stderr] Compiling gif v0.10.0 [INFO] [stderr] Compiling x11-dl v2.18.1 [INFO] [stderr] Compiling crossbeam-epoch v0.3.1 [INFO] [stderr] Compiling libloading v0.5.0 [INFO] [stderr] Compiling quote v0.6.4 [INFO] [stderr] Compiling wayland-scanner v0.12.5 [INFO] [stderr] Compiling gl_generator v0.9.0 [INFO] [stderr] Compiling dlib v0.4.1 [INFO] [stderr] Compiling num-traits v0.1.43 [INFO] [stderr] Compiling ordered-float v0.5.0 [INFO] [stderr] Compiling osmesa-sys v0.1.2 [INFO] [stderr] Compiling tempfile v3.0.3 [INFO] [stderr] Compiling crossbeam-deque v0.2.0 [INFO] [stderr] Compiling wayland-sys v0.12.5 [INFO] [stderr] Compiling syn v0.14.5 [INFO] [stderr] Compiling wayland-client v0.12.5 [INFO] [stderr] Compiling wayland-protocols v0.12.5 [INFO] [stderr] Compiling gl v0.10.0 [INFO] [stderr] Compiling glutin v0.14.0 [INFO] [stderr] Compiling rusttype v0.4.3 [INFO] [stderr] Compiling num-rational v0.1.42 [INFO] [stderr] Compiling serde_derive v1.0.70 [INFO] [stderr] Compiling num-derive v0.2.2 [INFO] [stderr] Compiling png v0.12.0 [INFO] [stderr] Compiling piston2d-graphics v0.26.0 [INFO] [stderr] Compiling wayland-kbd v0.13.1 [INFO] [stderr] Compiling jpeg-decoder v0.1.15 [INFO] [stderr] Compiling image v0.19.0 [INFO] [stderr] Compiling wayland-window v0.13.3 [INFO] [stderr] Compiling winit v0.12.0 [INFO] [stderr] Compiling pistoncore-input v0.21.0 [INFO] [stderr] Compiling piston2d-opengl_graphics v0.53.0 [INFO] [stderr] Compiling pistoncore-window v0.32.0 [INFO] [stderr] Compiling pistoncore-event_loop v0.37.0 [INFO] [stderr] Compiling pistoncore-glutin_window v0.47.0 [INFO] [stderr] Compiling piston v0.37.0 [INFO] [stderr] Compiling fives v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `unused` [INFO] [stdout] --> src/gameboard_graphics.rs:144:13 [INFO] [stdout] | [INFO] [stdout] 144 | for unused in 0..((val as f64 / 5.0).log2() as usize / 6) { [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_unused` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused `Result` that must be used [INFO] [stdout] --> src/gameboard_graphics.rs:111:21 [INFO] [stdout] | [INFO] [stdout] 111 | / text::Text::new_color(settings.text_color, 40) [INFO] [stdout] 112 | | .draw(&number, glyphs, &c.draw_state, [INFO] [stdout] 113 | | c.transform.trans(pos[0], pos[1]), g); [INFO] [stdout] | |____________________________________________________________________^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_must_use)]` on by default [INFO] [stdout] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused `Result` that must be used [INFO] [stdout] --> src/gameboard_graphics.rs:119:9 [INFO] [stdout] | [INFO] [stdout] 119 | / text::Text::new(50).draw(&board.get_score(), glyphs, &c.draw_state, [INFO] [stdout] 120 | | c.transform.trans(20.0, settings.length + 50.0), g); [INFO] [stdout] | |__________________________________________________________________________________^ [INFO] [stdout] | [INFO] [stdout] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 1m 15s [INFO] running `Command { std: "docker" "inspect" "ac99aeaeea0310246b48699dc21e7c92ffc271917e4b80d89af1183afe4c534b", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "ac99aeaeea0310246b48699dc21e7c92ffc271917e4b80d89af1183afe4c534b", kill_on_drop: false }` [INFO] [stdout] ac99aeaeea0310246b48699dc21e7c92ffc271917e4b80d89af1183afe4c534b [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-59/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-59/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 64f3fff9a09570386d1c8489acd6c09dffa6f25a401963b99dcea4db766bea96 [INFO] running `Command { std: "docker" "start" "-a" "64f3fff9a09570386d1c8489acd6c09dffa6f25a401963b99dcea4db766bea96", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Compiling fives v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `unused` [INFO] [stdout] --> src/gameboard_graphics.rs:144:13 [INFO] [stdout] | [INFO] [stdout] 144 | for unused in 0..((val as f64 / 5.0).log2() as usize / 6) { [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_unused` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused `Result` that must be used [INFO] [stdout] --> src/gameboard_graphics.rs:111:21 [INFO] [stdout] | [INFO] [stdout] 111 | / text::Text::new_color(settings.text_color, 40) [INFO] [stdout] 112 | | .draw(&number, glyphs, &c.draw_state, [INFO] [stdout] 113 | | c.transform.trans(pos[0], pos[1]), g); [INFO] [stdout] | |____________________________________________________________________^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_must_use)]` on by default [INFO] [stdout] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused `Result` that must be used [INFO] [stdout] --> src/gameboard_graphics.rs:119:9 [INFO] [stdout] | [INFO] [stdout] 119 | / text::Text::new(50).draw(&board.get_score(), glyphs, &c.draw_state, [INFO] [stdout] 120 | | c.transform.trans(20.0, settings.length + 50.0), g); [INFO] [stdout] | |__________________________________________________________________________________^ [INFO] [stdout] | [INFO] [stdout] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 10.15s [INFO] running `Command { std: "docker" "inspect" "64f3fff9a09570386d1c8489acd6c09dffa6f25a401963b99dcea4db766bea96", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "64f3fff9a09570386d1c8489acd6c09dffa6f25a401963b99dcea4db766bea96", kill_on_drop: false }` [INFO] [stdout] 64f3fff9a09570386d1c8489acd6c09dffa6f25a401963b99dcea4db766bea96 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-59/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-59/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] 5387364e56f1583e4e11755985583b8b5e386b8fbcda2f10807bb0b71905e6c2 [INFO] running `Command { std: "docker" "start" "-a" "5387364e56f1583e4e11755985583b8b5e386b8fbcda2f10807bb0b71905e6c2", kill_on_drop: false }` [INFO] [stderr] warning: unused variable: `unused` [INFO] [stderr] --> src/gameboard_graphics.rs:144:13 [INFO] [stderr] | [INFO] [stderr] 144 | for unused in 0..((val as f64 / 5.0).log2() as usize / 6) { [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_unused` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused `Result` that must be used [INFO] [stderr] --> src/gameboard_graphics.rs:111:21 [INFO] [stderr] | [INFO] [stderr] 111 | / text::Text::new_color(settings.text_color, 40) [INFO] [stderr] 112 | | .draw(&number, glyphs, &c.draw_state, [INFO] [stderr] 113 | | c.transform.trans(pos[0], pos[1]), g); [INFO] [stderr] | |____________________________________________________________________^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_must_use)]` on by default [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused `Result` that must be used [INFO] [stderr] --> src/gameboard_graphics.rs:119:9 [INFO] [stderr] | [INFO] [stderr] 119 | / text::Text::new(50).draw(&board.get_score(), glyphs, &c.draw_state, [INFO] [stderr] 120 | | c.transform.trans(20.0, settings.length + 50.0), g); [INFO] [stderr] | |__________________________________________________________________________________^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: `fives` (bin "fives" test) generated 3 warnings [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.25s [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/fives-66c5157ab12ddea4) [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" "5387364e56f1583e4e11755985583b8b5e386b8fbcda2f10807bb0b71905e6c2", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "5387364e56f1583e4e11755985583b8b5e386b8fbcda2f10807bb0b71905e6c2", kill_on_drop: false }` [INFO] [stdout] 5387364e56f1583e4e11755985583b8b5e386b8fbcda2f10807bb0b71905e6c2