[INFO] cloning repository https://github.com/linkcheng/rust_demo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/linkcheng/rust_demo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flinkcheng%2Frust_demo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flinkcheng%2Frust_demo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fa47f8ec2a03e71effe87d879354dd4f5e5d70be
[INFO] testing linkcheng/rust_demo against 1.98.0-beta.8+cargoflags=--release for beta-release-1.99-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flinkcheng%2Frust_demo" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/linkcheng/rust_demo
[INFO] finished tweaking git repo https://github.com/linkcheng/rust_demo
[INFO] tweaked toml for git repo https://github.com/linkcheng/rust_demo written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/linkcheng/rust_demo on toolchain 1.98.0-beta.8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.98.0-beta.8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/linkcheng/rust_demo 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" "+1.98.0-beta.8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr]   |
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:8683fc1fc2eb5c9ac98e0d076ab094b2ffac7f99da555d2b6a2e27f346de2ec7" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 3912de92947826fc4748106e0e42342dd5ea114efdb56632cdd9fa8f20fdfe1d
[INFO] running `Command { std: "docker" "start" "3912de92947826fc4748106e0e42342dd5ea114efdb56632cdd9fa8f20fdfe1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3912de92947826fc4748106e0e42342dd5ea114efdb56632cdd9fa8f20fdfe1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "3912de92947826fc4748106e0e42342dd5ea114efdb56632cdd9fa8f20fdfe1d" "/opt/rustwide/cargo-home/bin/cargo" "+1.98.0-beta.8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3912de92947826fc4748106e0e42342dd5ea114efdb56632cdd9fa8f20fdfe1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "3912de92947826fc4748106e0e42342dd5ea114efdb56632cdd9fa8f20fdfe1d" "/opt/rustwide/cargo-home/bin/cargo" "+1.98.0-beta.8" "build" "--frozen" "--message-format=json" "--release", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr]   |
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]    Compiling trait_demo v0.1.0 (/opt/rustwide/workdir/trait_demo)
[INFO] [stderr]    Compiling world_hello v0.1.0 (/opt/rustwide/workdir/world_hello)
[INFO] [stderr]    Compiling area_demo v0.1.0 (/opt/rustwide/workdir/area_demo)
[INFO] [stderr]    Compiling sort_demo v0.1.0 (/opt/rustwide/workdir/sort_demo)
[INFO] [stderr]    Compiling sum_demo v0.1.0 (/opt/rustwide/workdir/sum_demo)
[INFO] [stderr]    Compiling trafficlight_demo v0.1.0 (/opt/rustwide/workdir/trafficlight_demo)
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> world_hello/src/main.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let &a= r;
[INFO] [stdout]   |          ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> world_hello/src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let ref a= r;
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> world_hello/src/main.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let a= &r;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `release` profile [optimized] target(s) in 0.60s
[INFO] running `Command { std: "docker" "inspect" "3912de92947826fc4748106e0e42342dd5ea114efdb56632cdd9fa8f20fdfe1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "3912de92947826fc4748106e0e42342dd5ea114efdb56632cdd9fa8f20fdfe1d" "/opt/rustwide/cargo-home/bin/cargo" "+1.98.0-beta.8" "test" "--frozen" "--no-run" "--message-format=json" "--release", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr]   |
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]    Compiling area_demo v0.1.0 (/opt/rustwide/workdir/area_demo)
[INFO] [stderr]    Compiling trait_demo v0.1.0 (/opt/rustwide/workdir/trait_demo)
[INFO] [stderr]    Compiling sum_demo v0.1.0 (/opt/rustwide/workdir/sum_demo)
[INFO] [stderr]    Compiling trafficlight_demo v0.1.0 (/opt/rustwide/workdir/trafficlight_demo)
[INFO] [stderr]    Compiling world_hello v0.1.0 (/opt/rustwide/workdir/world_hello)
[INFO] [stderr]    Compiling sort_demo v0.1.0 (/opt/rustwide/workdir/sort_demo)
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> world_hello/src/main.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let &a= r;
[INFO] [stdout]   |          ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> world_hello/src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let ref a= r;
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> world_hello/src/main.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let a= &r;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `release` profile [optimized] target(s) in 0.41s
[INFO] running `Command { std: "docker" "inspect" "3912de92947826fc4748106e0e42342dd5ea114efdb56632cdd9fa8f20fdfe1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "3912de92947826fc4748106e0e42342dd5ea114efdb56632cdd9fa8f20fdfe1d" "/opt/rustwide/cargo-home/bin/cargo" "+1.98.0-beta.8" "test" "--frozen" "--release", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stdout] 
[INFO] [stderr]   |
[INFO] [stdout] running 0 tests
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stdout] 
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stdout] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stdout] 
[INFO] [stderr]  --> world_hello/src/main.rs:6:10
[INFO] [stdout] running 0 tests
[INFO] [stderr]   |
[INFO] [stdout] 
[INFO] [stderr] 6 |     let &a= r;
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]   |          ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stderr]   |
[INFO] [stdout] 
[INFO] [stderr]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] running 0 tests
[INFO] [stderr] 
[INFO] [stdout] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]  --> world_hello/src/main.rs:7:9
[INFO] [stdout] 
[INFO] [stderr]   |
[INFO] [stdout] 
[INFO] [stderr] 7 |     let ref a= r;
[INFO] [stdout] running 0 tests
[INFO] [stderr]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stdout] 
[INFO] [stderr]  --> world_hello/src/main.rs:8:9
[INFO] [stdout] 
[INFO] [stderr]   |
[INFO] [stdout] running 0 tests
[INFO] [stderr] 8 |     let a= &r;
[INFO] [stdout] 
[INFO] [stderr]   |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr] 
[INFO] [stdout] 
[INFO] [stderr] warning: `world_hello` (bin "world_hello" test) generated 3 warnings (run `cargo fix --bin "world_hello" -p world_hello --tests` to apply 3 suggestions)
[INFO] [stdout] 
[INFO] [stderr]     Finished `release` profile [optimized] target(s) in 0.02s
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/release/deps/area_demo-9a944b9684575feb)
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/release/deps/sort_demo-e1bf8215d91b4f0a)
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/release/deps/sum_demo-7e8f534a232c149b)
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/release/deps/trafficlight_demo-3bf9870552a8711b)
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/release/deps/trait_demo-66dfab35df7419e0)
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/release/deps/world_hello-54a91f1782159ff5)
[INFO] running `Command { std: "docker" "inspect" "3912de92947826fc4748106e0e42342dd5ea114efdb56632cdd9fa8f20fdfe1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3912de92947826fc4748106e0e42342dd5ea114efdb56632cdd9fa8f20fdfe1d", kill_on_drop: false }`
[INFO] [stdout] 3912de92947826fc4748106e0e42342dd5ea114efdb56632cdd9fa8f20fdfe1d
