[INFO] cloning repository https://github.com/McGiver-/rust_practice
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/McGiver-/rust_practice" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMcGiver-%2Frust_practice", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMcGiver-%2Frust_practice'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c8a73d658f33fc5ce21503726c9815dba08bf932
[INFO] testing McGiver-/rust_practice against try#ce59db7a1b1b012fb2793c4641c1bdecad7a128b for pr-85530
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMcGiver-%2Frust_practice" "/workspace/builds/worker-15/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-15/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/McGiver-/rust_practice on toolchain ce59db7a1b1b012fb2793c4641c1bdecad7a128b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/McGiver-/rust_practice
[INFO] finished tweaking git repo https://github.com/McGiver-/rust_practice
[INFO] tweaked toml for git repo https://github.com/McGiver-/rust_practice written to /workspace/builds/worker-15/source/Cargo.toml
[INFO] crate git repo https://github.com/McGiver-/rust_practice already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ab053bd0b86a15b31d0a5909db8ff34184037595e701e6a6851aa93db7761cde
[INFO] running `Command { std: "docker" "start" "-a" "ab053bd0b86a15b31d0a5909db8ff34184037595e701e6a6851aa93db7761cde", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ab053bd0b86a15b31d0a5909db8ff34184037595e701e6a6851aa93db7761cde", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab053bd0b86a15b31d0a5909db8ff34184037595e701e6a6851aa93db7761cde", kill_on_drop: false }`
[INFO] [stdout] ab053bd0b86a15b31d0a5909db8ff34184037595e701e6a6851aa93db7761cde
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] de0187ed4bb8bef4f2bba59b13a323289cbb90c654c67ac98eaad6cb4fb89172
[INFO] running `Command { std: "docker" "start" "-a" "de0187ed4bb8bef4f2bba59b13a323289cbb90c654c67ac98eaad6cb4fb89172", kill_on_drop: false }`
[INFO] [stderr]    Compiling validate_palindrome v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/main.rs:31:28
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub fn bracket_balanced<T>(v: &[T],map: HashMap<T,T>) -> bool where
[INFO] [stdout]    |                            ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `map`
[INFO] [stdout]   --> src/main.rs:31:36
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub fn bracket_balanced<T>(v: &[T],map: HashMap<T,T>) -> bool where
[INFO] [stdout]    |                                    ^^^ help: if this is intentional, prefix it with an underscore: `_map`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.53s
[INFO] running `Command { std: "docker" "inspect" "de0187ed4bb8bef4f2bba59b13a323289cbb90c654c67ac98eaad6cb4fb89172", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de0187ed4bb8bef4f2bba59b13a323289cbb90c654c67ac98eaad6cb4fb89172", kill_on_drop: false }`
[INFO] [stdout] de0187ed4bb8bef4f2bba59b13a323289cbb90c654c67ac98eaad6cb4fb89172
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 603b6d4c6995f0f10018f1e0c757f33a721105f27b8e0ae4676d65be4f0c6fac
[INFO] running `Command { std: "docker" "start" "-a" "603b6d4c6995f0f10018f1e0c757f33a721105f27b8e0ae4676d65be4f0c6fac", kill_on_drop: false }`
[INFO] [stderr]    Compiling validate_palindrome v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/main.rs:31:28
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub fn bracket_balanced<T>(v: &[T],map: HashMap<T,T>) -> bool where
[INFO] [stdout]    |                            ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `map`
[INFO] [stdout]   --> src/main.rs:31:36
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub fn bracket_balanced<T>(v: &[T],map: HashMap<T,T>) -> bool where
[INFO] [stdout]    |                                    ^^^ help: if this is intentional, prefix it with an underscore: `_map`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains an unused formatting placeholder
[INFO] [stdout]   --> src/main.rs:63:46
[INFO] [stdout]    |
[INFO] [stdout] 63 |         assert!(balanced("{}".to_string()), "{}");
[INFO] [stdout]    |                                              ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]    = note: this message is not used as a format string when given without arguments, but will be in Rust 2021
[INFO] [stdout] help: add the missing argument
[INFO] [stdout]    |
[INFO] [stdout] 63 |         assert!(balanced("{}".to_string()), "{}", ...);
[INFO] [stdout]    |                                                 ^^^^^
[INFO] [stdout] help: or add a "{}" format string to use the message literally
[INFO] [stdout]    |
[INFO] [stdout] 63 |         assert!(balanced("{}".to_string()), "{}", "{}");
[INFO] [stdout]    |                                             ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains braces
[INFO] [stdout]   --> src/main.rs:64:48
[INFO] [stdout]    |
[INFO] [stdout] 64 |         assert!(balanced("{[]}".to_string()), "{[]}");
[INFO] [stdout]    |                                                ^  ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]    |
[INFO] [stdout] 64 |         assert!(balanced("{[]}".to_string()), "{}", "{[]}");
[INFO] [stdout]    |                                               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains braces
[INFO] [stdout]   --> src/main.rs:65:50
[INFO] [stdout]    |
[INFO] [stdout] 65 |         assert!(balanced("{()[]}".to_string()), "{()[]}");
[INFO] [stdout]    |                                                  ^    ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]    |
[INFO] [stdout] 65 |         assert!(balanced("{()[]}".to_string()), "{}", "{()[]}");
[INFO] [stdout]    |                                                 ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]   --> src/main.rs:70:46
[INFO] [stdout]    |
[INFO] [stdout] 70 |         assert!(!balanced("{".to_string()), "{");
[INFO] [stdout]    |                                              ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]    |
[INFO] [stdout] 70 |         assert!(!balanced("{".to_string()), "{}", "{");
[INFO] [stdout]    |                                             ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]   --> src/main.rs:71:47
[INFO] [stdout]    |
[INFO] [stdout] 71 |         assert!(!balanced("{)".to_string()), "{)");
[INFO] [stdout]    |                                               ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]    |
[INFO] [stdout] 71 |         assert!(!balanced("{)".to_string()), "{}", "{)");
[INFO] [stdout]    |                                              ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains braces
[INFO] [stdout]   --> src/main.rs:72:53
[INFO] [stdout]    |
[INFO] [stdout] 72 |         assert!(!balanced("{}}{{}{}".to_string()), "{}}{{}{}");
[INFO] [stdout]    |                                                     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]    |
[INFO] [stdout] 72 |         assert!(!balanced("{}}{{}{}".to_string()), "{}", "{}}{{}{}");
[INFO] [stdout]    |                                                    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains braces
[INFO] [stdout]   --> src/main.rs:73:56
[INFO] [stdout]    |
[INFO] [stdout] 73 |         assert!(!balanced("{()[]}hello".to_string()), "{()[]}hello");
[INFO] [stdout]    |                                                        ^    ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]    |
[INFO] [stdout] 73 |         assert!(!balanced("{()[]}hello".to_string()), "{}", "{()[]}hello");
[INFO] [stdout]    |                                                       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.01s
[INFO] running `Command { std: "docker" "inspect" "603b6d4c6995f0f10018f1e0c757f33a721105f27b8e0ae4676d65be4f0c6fac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "603b6d4c6995f0f10018f1e0c757f33a721105f27b8e0ae4676d65be4f0c6fac", kill_on_drop: false }`
[INFO] [stdout] 603b6d4c6995f0f10018f1e0c757f33a721105f27b8e0ae4676d65be4f0c6fac
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 3f4a05a2a9ce06b60bf09bab10e1c4831f54c755d210629b1720603f22f9bab8
[INFO] running `Command { std: "docker" "start" "-a" "3f4a05a2a9ce06b60bf09bab10e1c4831f54c755d210629b1720603f22f9bab8", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stdout] running 2 tests
[INFO] [stderr]   --> src/main.rs:31:28
[INFO] [stdout] test tests::balanced_passes ... ok
[INFO] [stderr]    |
[INFO] [stdout] test tests::balanced_failures ... ok
[INFO] [stderr] 31 | pub fn bracket_balanced<T>(v: &[T],map: HashMap<T,T>) -> bool where
[INFO] [stdout] 
[INFO] [stderr]    |                            ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]    |
[INFO] [stdout] 
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `map`
[INFO] [stderr]   --> src/main.rs:31:36
[INFO] [stderr]    |
[INFO] [stderr] 31 | pub fn bracket_balanced<T>(v: &[T],map: HashMap<T,T>) -> bool where
[INFO] [stderr]    |                                    ^^^ help: if this is intentional, prefix it with an underscore: `_map`
[INFO] [stderr] 
[INFO] [stderr] warning: panic message contains an unused formatting placeholder
[INFO] [stderr]   --> src/main.rs:63:46
[INFO] [stderr]    |
[INFO] [stderr] 63 |         assert!(balanced("{}".to_string()), "{}");
[INFO] [stderr]    |                                              ^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stderr]    = note: this message is not used as a format string when given without arguments, but will be in Rust 2021
[INFO] [stderr] help: add the missing argument
[INFO] [stderr]    |
[INFO] [stderr] 63 |         assert!(balanced("{}".to_string()), "{}", ...);
[INFO] [stderr]    |                                                 ^^^^^
[INFO] [stderr] help: or add a "{}" format string to use the message literally
[INFO] [stderr]    |
[INFO] [stderr] 63 |         assert!(balanced("{}".to_string()), "{}", "{}");
[INFO] [stderr]    |                                             ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: panic message contains braces
[INFO] [stderr]   --> src/main.rs:64:48
[INFO] [stderr]    |
[INFO] [stderr] 64 |         assert!(balanced("{[]}".to_string()), "{[]}");
[INFO] [stderr]    |                                                ^  ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stderr] help: add a "{}" format string to use the message literally
[INFO] [stderr]    |
[INFO] [stderr] 64 |         assert!(balanced("{[]}".to_string()), "{}", "{[]}");
[INFO] [stderr]    |                                               ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: panic message contains braces
[INFO] [stderr]   --> src/main.rs:65:50
[INFO] [stderr]    |
[INFO] [stderr] 65 |         assert!(balanced("{()[]}".to_string()), "{()[]}");
[INFO] [stderr]    |                                                  ^    ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stderr] help: add a "{}" format string to use the message literally
[INFO] [stderr]    |
[INFO] [stderr] 65 |         assert!(balanced("{()[]}".to_string()), "{}", "{()[]}");
[INFO] [stderr]    |                                                 ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: panic message contains a brace
[INFO] [stderr]   --> src/main.rs:70:46
[INFO] [stderr]    |
[INFO] [stderr] 70 |         assert!(!balanced("{".to_string()), "{");
[INFO] [stderr]    |                                              ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stderr] help: add a "{}" format string to use the message literally
[INFO] [stderr]    |
[INFO] [stderr] 70 |         assert!(!balanced("{".to_string()), "{}", "{");
[INFO] [stderr]    |                                             ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: panic message contains a brace
[INFO] [stderr]   --> src/main.rs:71:47
[INFO] [stderr]    |
[INFO] [stderr] 71 |         assert!(!balanced("{)".to_string()), "{)");
[INFO] [stderr]    |                                               ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stderr] help: add a "{}" format string to use the message literally
[INFO] [stderr]    |
[INFO] [stderr] 71 |         assert!(!balanced("{)".to_string()), "{}", "{)");
[INFO] [stderr]    |                                              ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: panic message contains braces
[INFO] [stderr]   --> src/main.rs:72:53
[INFO] [stderr]    |
[INFO] [stderr] 72 |         assert!(!balanced("{}}{{}{}".to_string()), "{}}{{}{}");
[INFO] [stderr]    |                                                     ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stderr] help: add a "{}" format string to use the message literally
[INFO] [stderr]    |
[INFO] [stderr] 72 |         assert!(!balanced("{}}{{}{}".to_string()), "{}", "{}}{{}{}");
[INFO] [stderr]    |                                                    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: panic message contains braces
[INFO] [stderr]   --> src/main.rs:73:56
[INFO] [stderr]    |
[INFO] [stderr] 73 |         assert!(!balanced("{()[]}hello".to_string()), "{()[]}hello");
[INFO] [stderr]    |                                                        ^    ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stderr] help: add a "{}" format string to use the message literally
[INFO] [stderr]    |
[INFO] [stderr] 73 |         assert!(!balanced("{()[]}hello".to_string()), "{}", "{()[]}hello");
[INFO] [stderr]    |                                                       ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 9 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/validate_palindrome-64d286611ffefb3a)
[INFO] running `Command { std: "docker" "inspect" "3f4a05a2a9ce06b60bf09bab10e1c4831f54c755d210629b1720603f22f9bab8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f4a05a2a9ce06b60bf09bab10e1c4831f54c755d210629b1720603f22f9bab8", kill_on_drop: false }`
[INFO] [stdout] 3f4a05a2a9ce06b60bf09bab10e1c4831f54c755d210629b1720603f22f9bab8