[INFO] cloning repository https://github.com/hmc-memsafe-2016f/wk2-starter
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hmc-memsafe-2016f/wk2-starter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhmc-memsafe-2016f%2Fwk2-starter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhmc-memsafe-2016f%2Fwk2-starter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dde90e4a050fbfb2d74e08d7736e20dc87045162
[INFO] checking hmc-memsafe-2016f/wk2-starter against master#a609fb45efad59dfd459c76e50899be9f0583b5a for pr-80579
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhmc-memsafe-2016f%2Fwk2-starter" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hmc-memsafe-2016f/wk2-starter on toolchain a609fb45efad59dfd459c76e50899be9f0583b5a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/hmc-memsafe-2016f/wk2-starter
[INFO] finished tweaking git repo https://github.com/hmc-memsafe-2016f/wk2-starter
[INFO] tweaked toml for git repo https://github.com/hmc-memsafe-2016f/wk2-starter written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/hmc-memsafe-2016f/wk2-starter already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] error: the lock file /workspace/builds/worker-7/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fa2259736871e4b77d32bcbf3d7eeae3175c0382238066fd68547ca01ace7520
[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" "fa2259736871e4b77d32bcbf3d7eeae3175c0382238066fd68547ca01ace7520", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fa2259736871e4b77d32bcbf3d7eeae3175c0382238066fd68547ca01ace7520", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa2259736871e4b77d32bcbf3d7eeae3175c0382238066fd68547ca01ace7520", kill_on_drop: false }`
[INFO] [stdout] fa2259736871e4b77d32bcbf3d7eeae3175c0382238066fd68547ca01ace7520
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5abac07595ed9fcba4e112f48fed0a9874be16f1aeda815d3b6b0c5a3c52a4e4
[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" "5abac07595ed9fcba4e112f48fed0a9874be16f1aeda815d3b6b0c5a3c52a4e4", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking wk2-starter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: enum is never used: `Expr`
[INFO] [stdout]  --> src/expr/expr.rs:7:10
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub enum Expr {
[INFO] [stdout]   |          ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `BinOp`
[INFO] [stdout]   --> src/expr/expr.rs:12:10
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub enum BinOp {
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `evaluate`
[INFO] [stdout]   --> src/expr/expr.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub fn evaluate(&self) -> isize {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `operation_count`
[INFO] [stdout]   --> src/expr/expr.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub fn operation_count(&self) -> usize {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `depth`
[INFO] [stdout]   --> src/expr/expr.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub fn depth(&self) -> usize {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Expr`
[INFO] [stdout]  --> src/expr/expr.rs:7:10
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub enum Expr {
[INFO] [stdout]   |          ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `BinOp`
[INFO] [stdout]   --> src/expr/expr.rs:12:10
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub enum BinOp {
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `evaluate`
[INFO] [stdout]   --> src/expr/expr.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub fn evaluate(&self) -> isize {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `operation_count`
[INFO] [stdout]   --> src/expr/expr.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub fn operation_count(&self) -> usize {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `depth`
[INFO] [stdout]   --> src/expr/expr.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub fn depth(&self) -> usize {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.69s
[INFO] running `Command { std: "docker" "inspect" "5abac07595ed9fcba4e112f48fed0a9874be16f1aeda815d3b6b0c5a3c52a4e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5abac07595ed9fcba4e112f48fed0a9874be16f1aeda815d3b6b0c5a3c52a4e4", kill_on_drop: false }`
[INFO] [stdout] 5abac07595ed9fcba4e112f48fed0a9874be16f1aeda815d3b6b0c5a3c52a4e4