[INFO] cloning repository https://github.com/johnhenry/bash-backwards
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/johnhenry/bash-backwards" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjohnhenry%2Fbash-backwards", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjohnhenry%2Fbash-backwards'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 355f5e6dc7e48e254c3132851cd45a8b82d5a0f2
[INFO] checking johnhenry/bash-backwards against try#70daa2c0d8eed7066b07966f3c0b0b8622bff4e4 for pr-151539
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjohnhenry%2Fbash-backwards" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/johnhenry/bash-backwards
[INFO] finished tweaking git repo https://github.com/johnhenry/bash-backwards
[INFO] tweaked toml for git repo https://github.com/johnhenry/bash-backwards written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/johnhenry/bash-backwards on toolchain 70daa2c0d8eed7066b07966f3c0b0b8622bff4e4
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+70daa2c0d8eed7066b07966f3c0b0b8622bff4e4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/johnhenry/bash-backwards already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+70daa2c0d8eed7066b07966f3c0b0b8622bff4e4" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+70daa2c0d8eed7066b07966f3c0b0b8622bff4e4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] db0f24d02192fa611489755f12180b3cf3d505d05b2eb111c7f8a81ae961f44d
[INFO] running `Command { std: "docker" "start" "-a" "db0f24d02192fa611489755f12180b3cf3d505d05b2eb111c7f8a81ae961f44d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "db0f24d02192fa611489755f12180b3cf3d505d05b2eb111c7f8a81ae961f44d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "db0f24d02192fa611489755f12180b3cf3d505d05b2eb111c7f8a81ae961f44d", kill_on_drop: false }`
[INFO] [stdout] db0f24d02192fa611489755f12180b3cf3d505d05b2eb111c7f8a81ae961f44d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+70daa2c0d8eed7066b07966f3c0b0b8622bff4e4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cd383c9900843d4e426ac89b934f547b0cbf01df06f17934e8f7a7d55827b050
[INFO] running `Command { std: "docker" "start" "-a" "cd383c9900843d4e426ac89b934f547b0cbf01df06f17934e8f7a7d55827b050", kill_on_drop: false }`
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[INFO] [stdout] warning: unused variable: `lines`
[INFO] [stdout]    --> tests/test_combinators.rs:544:9
[INFO] [stdout]     |
[INFO] [stdout] 544 |     let lines: Vec<&str> = output.lines().collect();
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_lines`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]    --> tests/test_combinators.rs:400:34
[INFO] [stdout]     |
[INFO] [stdout] 400 |     assert!(output.is_empty() || output.len() >= 0);
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]    --> tests/test_combinators.rs:484:34
[INFO] [stdout]     |
[INFO] [stdout] 484 |     assert!(output.is_empty() || output.len() >= 0);
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]    --> tests/test_combinators.rs:654:34
[INFO] [stdout]     |
[INFO] [stdout] 654 |     assert!(output.is_empty() || output.len() >= 0);
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/test_stack.rs:178:9
[INFO] [stdout]     |
[INFO] [stdout] 178 |     let mut evaluator = Evaluator::new();
[INFO] [stdout]     |         ----^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `evaluator`
[INFO] [stdout]    --> tests/test_stack.rs:178:9
[INFO] [stdout]     |
[INFO] [stdout] 178 |     let mut evaluator = Evaluator::new();
[INFO] [stdout]     |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_evaluator`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `output`
[INFO] [stdout]    --> tests/test_string.rs:268:9
[INFO] [stdout]     |
[INFO] [stdout] 268 |     let output = eval(r#""hello world" len"#).unwrap();
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_output`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]    --> tests/test_shell.rs:425:34
[INFO] [stdout]     |
[INFO] [stdout] 425 |     assert!(output.is_empty() || output.len() >= 0);
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3m 20s
[INFO] running `Command { std: "docker" "inspect" "cd383c9900843d4e426ac89b934f547b0cbf01df06f17934e8f7a7d55827b050", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd383c9900843d4e426ac89b934f547b0cbf01df06f17934e8f7a7d55827b050", kill_on_drop: false }`
[INFO] [stdout] cd383c9900843d4e426ac89b934f547b0cbf01df06f17934e8f7a7d55827b050