[INFO] cloning repository https://github.com/hmc-memsafe-2016f/wk2-starter
[INFO] running `"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"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhmc-memsafe-2016f%2Fwk2-starter'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] dde90e4a050fbfb2d74e08d7736e20dc87045162
[INFO] checking hmc-memsafe-2016f/wk2-starter against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhmc-memsafe-2016f%2Fwk2-starter" "/workspace/builds/worker-9/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hmc-memsafe-2016f/wk2-starter on toolchain e4dba30b9b475d8750370c4dfb49b6541990904d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "read-manifest" "--manifest-path" "Cargo.toml"`
[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-9/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 `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /workspace/builds/worker-9/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[INFO] the lockfile is outdated, regenerating it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 `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2a437cc5e37022a00bed5b58d0dafd81090d3aaeb09823ab8119f830a22e10c1
[INFO] running `"docker" "start" "-a" "2a437cc5e37022a00bed5b58d0dafd81090d3aaeb09823ab8119f830a22e10c1"`
[INFO] [stderr]     Checking wk2-starter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: enum is never used: `Expr`
[INFO] [stderr]  --> src/expr/expr.rs:7:10
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub enum Expr {
[INFO] [stderr]   |          ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `BinOp`
[INFO] [stderr]   --> src/expr/expr.rs:12:10
[INFO] [stderr]    |
[INFO] [stderr] 12 | pub enum BinOp {
[INFO] [stderr]    |          ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `evaluate`
[INFO] [stderr]   --> src/expr/expr.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 |     pub fn evaluate(&self) -> isize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `operation_count`
[INFO] [stderr]   --> src/expr/expr.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 |     pub fn operation_count(&self) -> usize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `depth`
[INFO] [stderr]   --> src/expr/expr.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn depth(&self) -> usize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 5 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Expr`
[INFO] [stderr]  --> src/expr/expr.rs:7:10
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub enum Expr {
[INFO] [stderr]   |          ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `BinOp`
[INFO] [stderr]   --> src/expr/expr.rs:12:10
[INFO] [stderr]    |
[INFO] [stderr] 12 | pub enum BinOp {
[INFO] [stderr]    |          ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `evaluate`
[INFO] [stderr]   --> src/expr/expr.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 |     pub fn evaluate(&self) -> isize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `operation_count`
[INFO] [stderr]   --> src/expr/expr.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 |     pub fn operation_count(&self) -> usize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `depth`
[INFO] [stderr]   --> src/expr/expr.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn depth(&self) -> usize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 5 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.45s
[INFO] running `"docker" "inspect" "2a437cc5e37022a00bed5b58d0dafd81090d3aaeb09823ab8119f830a22e10c1"`
[INFO] running `"docker" "rm" "-f" "2a437cc5e37022a00bed5b58d0dafd81090d3aaeb09823ab8119f830a22e10c1"`
[INFO] [stdout] 2a437cc5e37022a00bed5b58d0dafd81090d3aaeb09823ab8119f830a22e10c1