[INFO] cloning repository https://github.com/Santhiyaa69/rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Santhiyaa69/rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSanthiyaa69%2Frust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSanthiyaa69%2Frust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 40e0ed6d9e9487f397809a257e7678ba8ebd0db7
[INFO] testing Santhiyaa69/rust 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%2FSanthiyaa69%2Frust" "/workspace/builds/worker-90/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-90/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Santhiyaa69/rust 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/Santhiyaa69/rust
[INFO] finished tweaking git repo https://github.com/Santhiyaa69/rust
[INFO] tweaked toml for git repo https://github.com/Santhiyaa69/rust written to /workspace/builds/worker-90/source/Cargo.toml
[INFO] crate git repo https://github.com/Santhiyaa69/rust 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-90/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-90/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] f0e43f20685ba09fdd0a05db414126c953e65dece1b62b1feba08c58536ac46d
[INFO] running `Command { std: "docker" "start" "-a" "f0e43f20685ba09fdd0a05db414126c953e65dece1b62b1feba08c58536ac46d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f0e43f20685ba09fdd0a05db414126c953e65dece1b62b1feba08c58536ac46d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f0e43f20685ba09fdd0a05db414126c953e65dece1b62b1feba08c58536ac46d", kill_on_drop: false }`
[INFO] [stdout] f0e43f20685ba09fdd0a05db414126c953e65dece1b62b1feba08c58536ac46d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-90/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-90/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] 6b4e76806a3e05cb79bddab65ea830a456c5c316fc271ed49d57a64528dc0893
[INFO] running `Command { std: "docker" "start" "-a" "6b4e76806a3e05cb79bddab65ea830a456c5c316fc271ed49d57a64528dc0893", kill_on_drop: false }`
[INFO] [stderr]    Compiling tryrust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `HashSet`
[INFO] [stdout]  --> src/hashmap.rs:1:33
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::{HashMap, HashSet};
[INFO] [stdout]   |                                 ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/hashmap.rs:14:10
[INFO] [stdout]    |
[INFO] [stdout] 14 |      let value = map.get(&address); 
[INFO] [stdout]    |          ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/hashmap.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let s = map.get(&state);
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `length`
[INFO] [stdout]   --> src/hashmap.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let length = map.len();
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_length`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k`
[INFO] [stdout]   --> src/hashmap.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |     let k = map.keys();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_k`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `val`
[INFO] [stdout]   --> src/hashmap.rs:51:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |     let val = map.values();
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_val`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `emp`
[INFO] [stdout]   --> src/hashmap.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let emp = map.is_empty();
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_emp`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `stu`
[INFO] [stdout]   --> src/hashmap.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let stu: HashMap<String,i32> = HashMap::new();
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_stu`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/hashmap.rs:89:20
[INFO] [stdout]    |
[INFO] [stdout] 89 |                let r1 =  format!("{} {}", &val, "Excellent");
[INFO] [stdout]    |                    ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]   --> src/hashmap.rs:93:21
[INFO] [stdout]    |
[INFO] [stdout] 93 |                 let r2 = format!("{} {}", &val, "Good");
[INFO] [stdout]    |                     ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `val`
[INFO] [stdout]    --> src/hashmap.rs:108:14
[INFO] [stdout]     |
[INFO] [stdout] 108 |         Some(val) => 
[INFO] [stdout]     |              ^^^ help: if this is intentional, prefix it with an underscore: `_val`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]    --> src/hashmap.rs:141:9
[INFO] [stdout]     |
[INFO] [stdout] 141 |     let s1 = classes.entry(String::from("class A")).or_insert(vec![String::from("Joy")]);
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.36s
[INFO] running `Command { std: "docker" "inspect" "6b4e76806a3e05cb79bddab65ea830a456c5c316fc271ed49d57a64528dc0893", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b4e76806a3e05cb79bddab65ea830a456c5c316fc271ed49d57a64528dc0893", kill_on_drop: false }`
[INFO] [stdout] 6b4e76806a3e05cb79bddab65ea830a456c5c316fc271ed49d57a64528dc0893
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-90/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-90/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] e7f1e7b18992199406b45bba2a6b0fc9e58ff1f1af371601d1b373e25e62c383
[INFO] running `Command { std: "docker" "start" "-a" "e7f1e7b18992199406b45bba2a6b0fc9e58ff1f1af371601d1b373e25e62c383", kill_on_drop: false }`
[INFO] [stderr]    Compiling tryrust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `HashSet`
[INFO] [stdout]  --> src/hashmap.rs:1:33
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::{HashMap, HashSet};
[INFO] [stdout]   |                                 ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/hashmap.rs:14:10
[INFO] [stdout]    |
[INFO] [stdout] 14 |      let value = map.get(&address); 
[INFO] [stdout]    |          ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/hashmap.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let s = map.get(&state);
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `length`
[INFO] [stdout]   --> src/hashmap.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let length = map.len();
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_length`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k`
[INFO] [stdout]   --> src/hashmap.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |     let k = map.keys();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_k`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `val`
[INFO] [stdout]   --> src/hashmap.rs:51:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |     let val = map.values();
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_val`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `emp`
[INFO] [stdout]   --> src/hashmap.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let emp = map.is_empty();
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_emp`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `stu`
[INFO] [stdout]   --> src/hashmap.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let stu: HashMap<String,i32> = HashMap::new();
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_stu`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/hashmap.rs:89:20
[INFO] [stdout]    |
[INFO] [stdout] 89 |                let r1 =  format!("{} {}", &val, "Excellent");
[INFO] [stdout]    |                    ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]   --> src/hashmap.rs:93:21
[INFO] [stdout]    |
[INFO] [stdout] 93 |                 let r2 = format!("{} {}", &val, "Good");
[INFO] [stdout]    |                     ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `val`
[INFO] [stdout]    --> src/hashmap.rs:108:14
[INFO] [stdout]     |
[INFO] [stdout] 108 |         Some(val) => 
[INFO] [stdout]     |              ^^^ help: if this is intentional, prefix it with an underscore: `_val`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]    --> src/hashmap.rs:141:9
[INFO] [stdout]     |
[INFO] [stdout] 141 |     let s1 = classes.entry(String::from("class A")).or_insert(vec![String::from("Joy")]);
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.36s
[INFO] [stderr]   Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/tryrust-c21c9c2e853f6b54)
[INFO] running `Command { std: "docker" "inspect" "e7f1e7b18992199406b45bba2a6b0fc9e58ff1f1af371601d1b373e25e62c383", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e7f1e7b18992199406b45bba2a6b0fc9e58ff1f1af371601d1b373e25e62c383", kill_on_drop: false }`
[INFO] [stdout] e7f1e7b18992199406b45bba2a6b0fc9e58ff1f1af371601d1b373e25e62c383
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-90/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-90/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] 093a82db69b796b2ef5a6098729cd7ee2187460749c13cb17f272e0a236a7068
[INFO] running `Command { std: "docker" "start" "-a" "093a82db69b796b2ef5a6098729cd7ee2187460749c13cb17f272e0a236a7068", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `HashSet`
[INFO] [stderr]  --> src/hashmap.rs:1:33
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::collections::{HashMap, HashSet};
[INFO] [stderr]   |                                 ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]   --> src/hashmap.rs:14:10
[INFO] [stderr]    |
[INFO] [stderr] 14 |      let value = map.get(&address); 
[INFO] [stderr]    |          ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/hashmap.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let s = map.get(&state);
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `length`
[INFO] [stderr]   --> src/hashmap.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 |     let length = map.len();
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_length`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `k`
[INFO] [stderr]   --> src/hashmap.rs:47:9
[INFO] [stderr]    |
[INFO] [stderr] 47 |     let k = map.keys();
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_k`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `val`
[INFO] [stderr]   --> src/hashmap.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let val = map.values();
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_val`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `emp`
[INFO] [stderr]   --> src/hashmap.rs:55:9
[INFO] [stderr]    |
[INFO] [stderr] 55 |     let emp = map.is_empty();
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_emp`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `stu`
[INFO] [stderr]   --> src/hashmap.rs:58:9
[INFO] [stderr]    |
[INFO] [stderr] 58 |     let stu: HashMap<String,i32> = HashMap::new();
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_stu`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stderr]   --> src/hashmap.rs:89:20
[INFO] [stderr]    |
[INFO] [stderr] 89 |                let r1 =  format!("{} {}", &val, "Excellent");
[INFO] [stderr]    |                    ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r2`
[INFO] [stderr]   --> src/hashmap.rs:93:21
[INFO] [stderr]    |
[INFO] [stderr] 93 |                 let r2 = format!("{} {}", &val, "Good");
[INFO] [stderr]    |                     ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `val`
[INFO] [stderr]    --> src/hashmap.rs:108:14
[INFO] [stderr]     |
[INFO] [stderr] 108 |         Some(val) => 
[INFO] [stderr]     |              ^^^ help: if this is intentional, prefix it with an underscore: `_val`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s1`
[INFO] [stderr]    --> src/hashmap.rs:141:9
[INFO] [stderr]     |
[INFO] [stderr] 141 |     let s1 = classes.entry(String::from("class A")).or_insert(vec![String::from("Joy")]);
[INFO] [stderr]     |         ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stderr] 
[INFO] [stderr] warning: `tryrust` (bin "tryrust" test) generated 12 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/tryrust-c21c9c2e853f6b54)
[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 0.08s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "093a82db69b796b2ef5a6098729cd7ee2187460749c13cb17f272e0a236a7068", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "093a82db69b796b2ef5a6098729cd7ee2187460749c13cb17f272e0a236a7068", kill_on_drop: false }`
[INFO] [stdout] 093a82db69b796b2ef5a6098729cd7ee2187460749c13cb17f272e0a236a7068