[INFO] cloning repository https://github.com/Lolchek/rust-advent-of-code
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Lolchek/rust-advent-of-code" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLolchek%2Frust-advent-of-code", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLolchek%2Frust-advent-of-code'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 946c619926f2d0ee64cb4b7eea3e5cb22a548241
[INFO] checking Lolchek/rust-advent-of-code against master#01af5040fdada6ef8f1b749cda798d80a8590b2c for pr-84022
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLolchek%2Frust-advent-of-code" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Lolchek/rust-advent-of-code on toolchain 01af5040fdada6ef8f1b749cda798d80a8590b2c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+01af5040fdada6ef8f1b749cda798d80a8590b2c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Lolchek/rust-advent-of-code
[INFO] finished tweaking git repo https://github.com/Lolchek/rust-advent-of-code
[INFO] tweaked toml for git repo https://github.com/Lolchek/rust-advent-of-code written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/Lolchek/rust-advent-of-code already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+01af5040fdada6ef8f1b749cda798d80a8590b2c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:3d1cd00eb6e6ea2a7969240779edeaeff35b24be85036c63b883ba933028a15f" "/opt/rustwide/cargo-home/bin/cargo" "+01af5040fdada6ef8f1b749cda798d80a8590b2c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0b3f20a6c46110502f3f993d0b9bd42ccef843f0515364eb7036f0d3279aa1cf
[INFO] running `Command { std: "docker" "start" "-a" "0b3f20a6c46110502f3f993d0b9bd42ccef843f0515364eb7036f0d3279aa1cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0b3f20a6c46110502f3f993d0b9bd42ccef843f0515364eb7036f0d3279aa1cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b3f20a6c46110502f3f993d0b9bd42ccef843f0515364eb7036f0d3279aa1cf", kill_on_drop: false }`
[INFO] [stdout] 0b3f20a6c46110502f3f993d0b9bd42ccef843f0515364eb7036f0d3279aa1cf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:3d1cd00eb6e6ea2a7969240779edeaeff35b24be85036c63b883ba933028a15f" "/opt/rustwide/cargo-home/bin/cargo" "+01af5040fdada6ef8f1b749cda798d80a8590b2c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9c2f76ba1e835856456ba8efc9670edc654dab1f9c819b2001cc2b1143a20c9b
[INFO] running `Command { std: "docker" "start" "-a" "9c2f76ba1e835856456ba8efc9670edc654dab1f9c819b2001cc2b1143a20c9b", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking regex-syntax v0.6.21
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking aho-corasick v0.7.15
[INFO] [stderr]     Checking regex v1.4.2
[INFO] [stderr]     Checking advent-of-code v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `filepath`
[INFO] [stdout]  --> src/day5/src.rs:1:13
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn day5(filepath: &str){
[INFO] [stdout]   |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_filepath`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `filepath`
[INFO] [stdout]    --> src/main.rs:113:9
[INFO] [stdout]     |
[INFO] [stdout] 113 |     let filepath = "src/day6/data/input.txt";
[INFO] [stdout]     |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_filepath`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task1` is never used
[INFO] [stdout]   --> src/main.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn task1() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `filepath`
[INFO] [stdout]  --> src/day5/src.rs:1:13
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn day5(filepath: &str){
[INFO] [stdout]   |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_filepath`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `filepath`
[INFO] [stdout]    --> src/main.rs:113:9
[INFO] [stdout]     |
[INFO] [stdout] 113 |     let filepath = "src/day6/data/input.txt";
[INFO] [stdout]     |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_filepath`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task2` is never used
[INFO] [stdout]   --> src/main.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn task2() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task3` is never used
[INFO] [stdout]   --> src/main.rs:92:4
[INFO] [stdout]    |
[INFO] [stdout] 92 | fn task3(){
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task4` is never used
[INFO] [stdout]   --> src/main.rs:97:4
[INFO] [stdout]    |
[INFO] [stdout] 97 | fn task4(){
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task5` is never used
[INFO] [stdout]    --> src/main.rs:106:4
[INFO] [stdout]     |
[INFO] [stdout] 106 | fn task5(){
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task6` is never used
[INFO] [stdout]    --> src/main.rs:112:4
[INFO] [stdout]     |
[INFO] [stdout] 112 | fn task6(){
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `map`, `len_row` and `len_col` are never read
[INFO] [stdout]  --> src/day3/day3code.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct TreeMap {
[INFO] [stdout]   |        ------- fields in this struct
[INFO] [stdout] 5 |     map: Vec<Vec<char>>,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 6 |     len_row: i32,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 7 |     len_col: i32,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `TreeMap` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_map_from_file` is never used
[INFO] [stdout]   --> src/day3/day3code.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn build_map_from_file(filename: &str) -> TreeMap{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run_with_steps` is never used
[INFO] [stdout]   --> src/day3/day3code.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn run_with_steps(map: &TreeMap, right: i32, down: i32) -> i32{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `day3` is never used
[INFO] [stdout]   --> src/day3/day3code.rs:78:8
[INFO] [stdout]    |
[INFO] [stdout] 78 | pub fn day3(filename: &str) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `get_point` is never used
[INFO] [stdout]   --> src/day3/day3code.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn get_point(&self, row: i32, column: i32) -> char{
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `is_end` is never used
[INFO] [stdout]   --> src/day3/day3code.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 |     fn is_end(&self, row: i32) -> bool{
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `is_tree` is never used
[INFO] [stdout]   --> src/day3/day3code.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fn is_tree(character: char) -> bool{
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple fields are never read
[INFO] [stdout]   --> src/day4/src.rs:6:5
[INFO] [stdout]    |
[INFO] [stdout] 5  | struct Passport {
[INFO] [stdout]    |        -------- fields in this struct
[INFO] [stdout] 6  |     byr: String,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 7  |     iyr: String,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 8  |     eyr: String,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 9  |     hgt: String,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 10 |     hcl: String,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 11 |     ecl: String,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 12 |     pid: String,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 13 |     cid: String
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Passport` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `load_passports_from_file` is never used
[INFO] [stdout]    --> src/day4/src.rs:100:4
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn load_passports_from_file(filename: &str) -> Vec<Passport>{
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `day4` is never used
[INFO] [stdout]    --> src/day4/src.rs:148:8
[INFO] [stdout]     |
[INFO] [stdout] 148 | pub fn day4(filepath: &str) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `is_valid` is never used
[INFO] [stdout]   --> src/day4/src.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 |     fn is_valid(&self) -> bool{
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `day5` is never used
[INFO] [stdout]  --> src/day5/src.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn day5(filepath: &str){
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task1` is never used
[INFO] [stdout]   --> src/main.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn task1() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task2` is never used
[INFO] [stdout]   --> src/main.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn task2() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task3` is never used
[INFO] [stdout]   --> src/main.rs:92:4
[INFO] [stdout]    |
[INFO] [stdout] 92 | fn task3(){
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task4` is never used
[INFO] [stdout]   --> src/main.rs:97:4
[INFO] [stdout]    |
[INFO] [stdout] 97 | fn task4(){
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task5` is never used
[INFO] [stdout]    --> src/main.rs:106:4
[INFO] [stdout]     |
[INFO] [stdout] 106 | fn task5(){
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task6` is never used
[INFO] [stdout]    --> src/main.rs:112:4
[INFO] [stdout]     |
[INFO] [stdout] 112 | fn task6(){
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `map`, `len_row` and `len_col` are never read
[INFO] [stdout]  --> src/day3/day3code.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct TreeMap {
[INFO] [stdout]   |        ------- fields in this struct
[INFO] [stdout] 5 |     map: Vec<Vec<char>>,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 6 |     len_row: i32,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 7 |     len_col: i32,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `TreeMap` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_map_from_file` is never used
[INFO] [stdout]   --> src/day3/day3code.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn build_map_from_file(filename: &str) -> TreeMap{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run_with_steps` is never used
[INFO] [stdout]   --> src/day3/day3code.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn run_with_steps(map: &TreeMap, right: i32, down: i32) -> i32{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `day3` is never used
[INFO] [stdout]   --> src/day3/day3code.rs:78:8
[INFO] [stdout]    |
[INFO] [stdout] 78 | pub fn day3(filename: &str) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `get_point` is never used
[INFO] [stdout]   --> src/day3/day3code.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn get_point(&self, row: i32, column: i32) -> char{
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `is_end` is never used
[INFO] [stdout]   --> src/day3/day3code.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 |     fn is_end(&self, row: i32) -> bool{
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `is_tree` is never used
[INFO] [stdout]   --> src/day3/day3code.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fn is_tree(character: char) -> bool{
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple fields are never read
[INFO] [stdout]   --> src/day4/src.rs:6:5
[INFO] [stdout]    |
[INFO] [stdout] 5  | struct Passport {
[INFO] [stdout]    |        -------- fields in this struct
[INFO] [stdout] 6  |     byr: String,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 7  |     iyr: String,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 8  |     eyr: String,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 9  |     hgt: String,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 10 |     hcl: String,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 11 |     ecl: String,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 12 |     pid: String,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 13 |     cid: String
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Passport` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `load_passports_from_file` is never used
[INFO] [stdout]    --> src/day4/src.rs:100:4
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn load_passports_from_file(filename: &str) -> Vec<Passport>{
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `day4` is never used
[INFO] [stdout]    --> src/day4/src.rs:148:8
[INFO] [stdout]     |
[INFO] [stdout] 148 | pub fn day4(filepath: &str) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `is_valid` is never used
[INFO] [stdout]   --> src/day4/src.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 |     fn is_valid(&self) -> bool{
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `day5` is never used
[INFO] [stdout]  --> src/day5/src.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn day5(filepath: &str){
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.77s
[INFO] running `Command { std: "docker" "inspect" "9c2f76ba1e835856456ba8efc9670edc654dab1f9c819b2001cc2b1143a20c9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9c2f76ba1e835856456ba8efc9670edc654dab1f9c819b2001cc2b1143a20c9b", kill_on_drop: false }`
[INFO] [stdout] 9c2f76ba1e835856456ba8efc9670edc654dab1f9c819b2001cc2b1143a20c9b