[INFO] cloning repository https://github.com/1971cmd/c4_rust_alwathba
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/1971cmd/c4_rust_alwathba" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F1971cmd%2Fc4_rust_alwathba", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F1971cmd%2Fc4_rust_alwathba'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4e6bc804cab7f6e3dacf61a3b9a487f19c5bbdac
[INFO] checking 1971cmd/c4_rust_alwathba against master#3129d37ef7075ee3cbaa3d6cbe1b5794f67192b0 for pr-143164
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F1971cmd%2Fc4_rust_alwathba" "/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/1971cmd/c4_rust_alwathba
[INFO] finished tweaking git repo https://github.com/1971cmd/c4_rust_alwathba
[INFO] tweaked toml for git repo https://github.com/1971cmd/c4_rust_alwathba written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/1971cmd/c4_rust_alwathba on toolchain 3129d37ef7075ee3cbaa3d6cbe1b5794f67192b0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3129d37ef7075ee3cbaa3d6cbe1b5794f67192b0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/1971cmd/c4_rust_alwathba 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" "+3129d37ef7075ee3cbaa3d6cbe1b5794f67192b0" "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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+3129d37ef7075ee3cbaa3d6cbe1b5794f67192b0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3127564f1984a9994e30dac46f22ef6a17e25f21d962fc64d0087de20a442b4c
[INFO] running `Command { std: "docker" "start" "-a" "3127564f1984a9994e30dac46f22ef6a17e25f21d962fc64d0087de20a442b4c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3127564f1984a9994e30dac46f22ef6a17e25f21d962fc64d0087de20a442b4c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3127564f1984a9994e30dac46f22ef6a17e25f21d962fc64d0087de20a442b4c", kill_on_drop: false }`
[INFO] [stdout] 3127564f1984a9994e30dac46f22ef6a17e25f21d962fc64d0087de20a442b4c
[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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+3129d37ef7075ee3cbaa3d6cbe1b5794f67192b0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e88643d54b526f296d523014f89c79c9966870b451573b7d21c2015f6a2f4e71
[INFO] running `Command { std: "docker" "start" "-a" "e88643d54b526f296d523014f89c79c9966870b451573b7d21c2015f6a2f4e71", kill_on_drop: false }`
[INFO] [stderr]     Checking lab v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Lexer`
[INFO] [stdout]    --> src/vm.rs:423:21
[INFO] [stdout]     |
[INFO] [stdout] 423 |     use crate::c4::{Lexer, Parser};
[INFO] [stdout]     |                     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `parent_env`
[INFO] [stdout]    --> src/vm.rs:174:13
[INFO] [stdout]     |
[INFO] [stdout] 174 |         let parent_env = self.env_stack.last().unwrap().clone();
[INFO] [stdout]     |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_parent_env`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `env`
[INFO] [stdout]    --> src/vm.rs:228:47
[INFO] [stdout]     |
[INFO] [stdout] 228 |                         Ok(Value::Function(_, env)) => {
[INFO] [stdout]     |                                               ^^^ help: if this is intentional, prefix it with an underscore: `_env`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `parent_env`
[INFO] [stdout]    --> src/vm.rs:174:13
[INFO] [stdout]     |
[INFO] [stdout] 174 |         let parent_env = self.env_stack.last().unwrap().clone();
[INFO] [stdout]     |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_parent_env`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `env`
[INFO] [stdout]    --> src/vm.rs:228:47
[INFO] [stdout]     |
[INFO] [stdout] 228 |                         Ok(Value::Function(_, env)) => {
[INFO] [stdout]     |                                               ^^^ help: if this is intentional, prefix it with an underscore: `_env`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Lexer`
[INFO] [stdout]  --> src/main.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 | use c4::{Lexer, Parser};
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Lexer`
[INFO] [stdout]  --> src/main.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 | use c4::{Lexer, Parser};
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.86s
[INFO] running `Command { std: "docker" "inspect" "e88643d54b526f296d523014f89c79c9966870b451573b7d21c2015f6a2f4e71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e88643d54b526f296d523014f89c79c9966870b451573b7d21c2015f6a2f4e71", kill_on_drop: false }`
[INFO] [stdout] e88643d54b526f296d523014f89c79c9966870b451573b7d21c2015f6a2f4e71
