[INFO] cloning repository https://github.com/palindrom615/problem_solving
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/palindrom615/problem_solving" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpalindrom615%2Fproblem_solving", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpalindrom615%2Fproblem_solving'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 56ff8b4121560baf4935bad19aeaf4a3c6171386
[INFO] checking palindrom615/problem_solving against beta-2020-07-24 for pr-75494-beta
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpalindrom615%2Fproblem_solving" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/palindrom615/problem_solving on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/palindrom615/problem_solving
[INFO] finished tweaking git repo https://github.com/palindrom615/problem_solving
[INFO] tweaked toml for git repo https://github.com/palindrom615/problem_solving written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/palindrom615/problem_solving already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] efc2e72369aa43ce5a84217e09ef4c177d004e14ccf9f48318959fcd620866b3
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "efc2e72369aa43ce5a84217e09ef4c177d004e14ccf9f48318959fcd620866b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "efc2e72369aa43ce5a84217e09ef4c177d004e14ccf9f48318959fcd620866b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "efc2e72369aa43ce5a84217e09ef4c177d004e14ccf9f48318959fcd620866b3", kill_on_drop: false }`
[INFO] [stdout] efc2e72369aa43ce5a84217e09ef4c177d004e14ccf9f48318959fcd620866b3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6464998bf266c158672969be62759d55f098f60c92b57bc552f0676c28d7c1d0
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "6464998bf266c158672969be62759d55f098f60c92b57bc552f0676c28d7c1d0", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.68
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling serde v1.0.106
[INFO] [stderr]    Compiling proc-macro2 v1.0.10
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling rayon-core v1.7.0
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking itoa v0.4.5
[INFO] [stderr]     Checking unicode-width v0.1.7
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]     Checking regex-syntax v0.6.17
[INFO] [stderr]     Checking ppv-lite86 v0.2.6
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling memoffset v0.5.4
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]     Checking walkdir v2.3.1
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling cast v0.2.3
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]     Checking crossbeam-queue v0.2.1
[INFO] [stderr]    Compiling syn v1.0.17
[INFO] [stderr]     Checking crossbeam-deque v0.7.3
[INFO] [stderr]     Checking criterion-plot v0.4.1
[INFO] [stderr]     Checking num_cpus v1.12.0
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking regex v1.3.6
[INFO] [stderr]     Checking plotters v0.2.12
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rayon v1.3.0
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking bstr v0.2.12
[INFO] [stderr]     Checking serde_json v1.0.51
[INFO] [stderr]     Checking csv v1.1.3
[INFO] [stderr]     Checking tinytemplate v1.0.3
[INFO] [stderr]    Compiling serde_derive v1.0.106
[INFO] [stderr]     Checking criterion v0.3.1
[INFO] [stderr]     Checking problem_solving v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]  --> src/bin/blank.rs:4:18
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let t: i32 = read_line()[0];
[INFO] [stdout]   |                  ^^^^^^^^^ cannot infer type for type parameter `B` declared on the function `read_line`
[INFO] [stdout]   |
[INFO] [stdout]   = note: type must be known at this point
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> src/bin/boj10892.rs:48:9
[INFO] [stdout]    |
[INFO] [stdout] 48 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `problem_solving`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> src/bin/boj12837.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/bin/boj10892.rs:27:20
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let n: usize = read_line()[0];
[INFO] [stdout]    |                    ^^^^^^^^^ cannot infer type for type parameter `B` declared on the function `read_line`
[INFO] [stdout]    |
[INFO] [stdout]    = note: type must be known at this point
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> src/bin/boj5463.rs:105:13
[INFO] [stdout]     |
[INFO] [stdout] 104 |     let line = read_line();
[INFO] [stdout]     |         ---- consider giving `line` a type
[INFO] [stdout] 105 |     let n = line[0];
[INFO] [stdout]     |             ^^^^ cannot infer type
[INFO] [stdout]     |
[INFO] [stdout]     = note: type must be known at this point
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/bin/boj10892.rs:27:20
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let n: usize = read_line()[0];
[INFO] [stdout]    |                    ^^^^^^^^^ cannot infer type for type parameter `B` declared on the function `read_line`
[INFO] [stdout]    |
[INFO] [stdout]    = note: type must be known at this point
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `graph`
[INFO] [stdout]   --> src/bin/boj13141.rs:18:10
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn solve(graph: Vec<Vec<usize>>) -> f32 {
[INFO] [stdout]    |          ^^^^^ help: if this is intentional, prefix it with an underscore: `_graph`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/bin/boj2014.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     for i in 0..n {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `max_val`
[INFO] [stdout]   --> src/bin/boj2014.rs:14:18
[INFO] [stdout]    |
[INFO] [stdout] 14 |             let &max_val = heap.peek_max().unwrap_or(&i32::max_value());
[INFO] [stdout]    |                  ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_max_val`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `graph`
[INFO] [stdout]   --> src/bin/boj13141.rs:18:10
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn solve(graph: Vec<Vec<usize>>) -> f32 {
[INFO] [stdout]    |          ^^^^^ help: if this is intentional, prefix it with an underscore: `_graph`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/bin/boj13141.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let mut res = vec![vec![std::usize::MAX; nodes + 1]; nodes + 1];
[INFO] [stdout]   |         ----^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `bfs`
[INFO] [stdout]  --> src/bin/boj13141.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn bfs(graph: Vec<Vec<usize>>) -> Vec<Vec<usize>> {
[INFO] [stdout]   |    ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/bin/boj13141.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let mut res = vec![vec![std::usize::MAX; nodes + 1]; nodes + 1];
[INFO] [stdout]   |         ----^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]  --> src/bin/boj12837.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let n = line[0];
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `solve`
[INFO] [stdout]   --> src/bin/boj13141.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn solve(graph: Vec<Vec<usize>>) -> f32 {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/bin/boj2296.rs:38:18
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let t: i32 = read_line()[0];
[INFO] [stdout]    |                  ^^^^^^^^^ cannot infer type for type parameter `B` declared on the function `read_line`
[INFO] [stdout]    |
[INFO] [stdout]    = note: type must be known at this point
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0107]: wrong number of type arguments: expected 2, found 1
[INFO] [stdout]   --> src/bin/boj2296.rs:41:15
[INFO] [stdout]    |
[INFO] [stdout] 41 |         match read_line::<i32>().as_slice() {
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^ expected 2 type arguments
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `bfs`
[INFO] [stdout]  --> src/bin/boj13141.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn bfs(graph: Vec<Vec<usize>>) -> Vec<Vec<usize>> {
[INFO] [stdout]   |    ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/bin/boj2296.rs:38:18
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let t: i32 = read_line()[0];
[INFO] [stdout]    |                  ^^^^^^^^^ cannot infer type for type parameter `B` declared on the function `read_line`
[INFO] [stdout]    |
[INFO] [stdout]    = note: type must be known at this point
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0107, E0282.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0107`.
[INFO] [stdout] 
[INFO] [stdout] error[E0107]: wrong number of type arguments: expected 2, found 1
[INFO] [stdout]   --> src/bin/boj15485.rs:65:16
[INFO] [stdout]    |
[INFO] [stdout] 65 |     let line = read_line::<String>();
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^ expected 2 type arguments
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0107]: wrong number of type arguments: expected 2, found 1
[INFO] [stdout]   --> src/bin/boj2296.rs:41:15
[INFO] [stdout]    |
[INFO] [stdout] 41 |         match read_line::<i32>().as_slice() {
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^ expected 2 type arguments
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/bin/boj18230.rs:33:20
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let n: usize = read_line()[0];
[INFO] [stdout]    |                    ^^^^^^^^^ cannot infer type for type parameter `B` declared on the function `read_line`
[INFO] [stdout]    |
[INFO] [stdout]    = note: type must be known at this point
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/bin/boj11508.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let n = read_line()[0];
[INFO] [stdout]    |             ^^^^^^^^^ cannot infer type for type parameter `B` declared on the function `read_line`
[INFO] [stdout]    |
[INFO] [stdout]    = note: type must be known at this point
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/boj10423.rs:85:13
[INFO] [stdout]    |
[INFO] [stdout] 85 |         let mut edges = vec![
[INFO] [stdout]    |             ----^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/bin/boj10423.rs:146:13
[INFO] [stdout]     |
[INFO] [stdout] 146 |         let mut edges = vec![
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/bin/boj10423.rs:171:13
[INFO] [stdout]     |
[INFO] [stdout] 171 |         let mut edges = vec![
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/bin/boj10423.rs:214:13
[INFO] [stdout]     |
[INFO] [stdout] 214 |         let mut edges = vec![
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0107, E0282.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0107`.
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0107`.
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> src/bin/boj16722.rs:155:13
[INFO] [stdout]     |
[INFO] [stdout] 155 |     let n = read_line()[0];
[INFO] [stdout]     |             ^^^^^^^^^ cannot infer type for type parameter `B` declared on the function `read_line`
[INFO] [stdout]     |
[INFO] [stdout]     = note: type must be known at this point
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]  --> src/bin/boj12837.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let n = line[0];
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "6464998bf266c158672969be62759d55f098f60c92b57bc552f0676c28d7c1d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6464998bf266c158672969be62759d55f098f60c92b57bc552f0676c28d7c1d0", kill_on_drop: false }`
[INFO] [stdout] 6464998bf266c158672969be62759d55f098f60c92b57bc552f0676c28d7c1d0
