[INFO] fetching crate develop_debug 0.1.2...
[INFO] checking develop_debug-0.1.2 against try#7b3565da729099dbe807466fcd118fb2815986e0 for pr-81789
[INFO] extracting crate develop_debug 0.1.2 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate develop_debug 0.1.2 on toolchain 7b3565da729099dbe807466fcd118fb2815986e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7b3565da729099dbe807466fcd118fb2815986e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate develop_debug 0.1.2
[INFO] finished tweaking crates.io crate develop_debug 0.1.2
[INFO] tweaked toml for crates.io crate develop_debug 0.1.2 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7b3565da729099dbe807466fcd118fb2815986e0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7b3565da729099dbe807466fcd118fb2815986e0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+7b3565da729099dbe807466fcd118fb2815986e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0c0d13f294eb6b0eefe6e1a472b4ac9f8955f5faa80ca8698daec630afd47e12
[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" "0c0d13f294eb6b0eefe6e1a472b4ac9f8955f5faa80ca8698daec630afd47e12", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0c0d13f294eb6b0eefe6e1a472b4ac9f8955f5faa80ca8698daec630afd47e12", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c0d13f294eb6b0eefe6e1a472b4ac9f8955f5faa80ca8698daec630afd47e12", kill_on_drop: false }`
[INFO] [stdout] 0c0d13f294eb6b0eefe6e1a472b4ac9f8955f5faa80ca8698daec630afd47e12
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+7b3565da729099dbe807466fcd118fb2815986e0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 654f5c31e0cd28efc5749366fefbaa51c572010cdcb54b0c0311e1685bbc84a5
[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" "654f5c31e0cd28efc5749366fefbaa51c572010cdcb54b0c0311e1685bbc84a5", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking develop_debug v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> tests/how_to_use.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let x = "dear X";
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `say`
[INFO] [stdout]  --> tests/how_to_use.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let say = "hello world!";
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_say`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `array`
[INFO] [stdout]  --> tests/how_to_use.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let array = vec!["a", "b", "c"];
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_array`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `title2`
[INFO] [stdout]  --> tests/how_to_use.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let title2 = "balabala...";
[INFO] [stdout]   |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_title2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> tests/how_to_use.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let x = "dear X";
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `say`
[INFO] [stdout]   --> tests/how_to_use.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let say = "hello world!";
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_say`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `array`
[INFO] [stdout]   --> tests/how_to_use.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let array = vec!["a", "b", "c"];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_array`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `title2`
[INFO] [stdout]   --> tests/how_to_use.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let title2 = "balabala...";
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_title2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.48s
[INFO] running `Command { std: "docker" "inspect" "654f5c31e0cd28efc5749366fefbaa51c572010cdcb54b0c0311e1685bbc84a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "654f5c31e0cd28efc5749366fefbaa51c572010cdcb54b0c0311e1685bbc84a5", kill_on_drop: false }`
[INFO] [stdout] 654f5c31e0cd28efc5749366fefbaa51c572010cdcb54b0c0311e1685bbc84a5