[INFO] cloning repository https://github.com/optozorax/fopply
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/optozorax/fopply" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Foptozorax%2Ffopply", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Foptozorax%2Ffopply'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9115e11c453574684b6dd605fd98869193344387
[INFO] checking optozorax/fopply against try#f6e2f78768c57172b99c3e85892f867894dc7e30 for pr-75502
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Foptozorax%2Ffopply" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/optozorax/fopply on toolchain f6e2f78768c57172b99c3e85892f867894dc7e30
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/optozorax/fopply
[INFO] finished tweaking git repo https://github.com/optozorax/fopply
[INFO] tweaked toml for git repo https://github.com/optozorax/fopply written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/optozorax/fopply already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f9740d59cd7ee9230776ad8027487a99ff8a99df778baaec9deb0437e0f9085c
[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" "f9740d59cd7ee9230776ad8027487a99ff8a99df778baaec9deb0437e0f9085c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f9740d59cd7ee9230776ad8027487a99ff8a99df778baaec9deb0437e0f9085c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9740d59cd7ee9230776ad8027487a99ff8a99df778baaec9deb0437e0f9085c", kill_on_drop: false }`
[INFO] [stdout] f9740d59cd7ee9230776ad8027487a99ff8a99df778baaec9deb0437e0f9085c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 6207ef580765923ae755e51654b56002bfafd9b07245ff9cdbc699375828b7a9
[INFO] running `Command { std: "docker" "start" "-a" "6207ef580765923ae755e51654b56002bfafd9b07245ff9cdbc699375828b7a9", kill_on_drop: false }`
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling libc v0.2.67
[INFO] [stderr]    Compiling peg-runtime v0.6.2
[INFO] [stderr]     Checking itertools v0.9.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.9
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking colored v1.9.3
[INFO] [stderr]    Compiling peg-macros v0.6.2
[INFO] [stderr]     Checking peg v0.6.2
[INFO] [stderr]     Checking rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]    --> src/main.rs:579:5
[INFO] [stdout]     |
[INFO] [stdout] 576 |     return;
[INFO] [stdout]     |     ------ any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 579 |     let formula = transformation("a+b <-> b+a").expect("wrong transformation");
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/main.rs:352:13
[INFO] [stdout]     |
[INFO] [stdout] 352 |             _ => Err(fmt::Error)
[INFO] [stdout]     |             ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]    --> src/main.rs:579:5
[INFO] [stdout]     |
[INFO] [stdout] 576 |     return;
[INFO] [stdout]     |     ------ any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 579 |     let formula = transformation("a+b <-> b+a").expect("wrong transformation");
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/main.rs:352:13
[INFO] [stdout]     |
[INFO] [stdout] 352 |             _ => Err(fmt::Error)
[INFO] [stdout]     |             ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `TreeIteratorState`
[INFO] [stdout]    --> src/main.rs:156:6
[INFO] [stdout]     |
[INFO] [stdout] 156 | enum TreeIteratorState {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_leaf`
[INFO] [stdout]    --> src/main.rs:166:8
[INFO] [stdout]     |
[INFO] [stdout] 166 |     fn is_leaf(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `eval`
[INFO] [stdout]    --> src/main.rs:386:4
[INFO] [stdout]     |
[INFO] [stdout] 386 | fn eval(expr: &Tree) -> Option<f64> {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `TreeIteratorState`
[INFO] [stdout]    --> src/main.rs:156:6
[INFO] [stdout]     |
[INFO] [stdout] 156 | enum TreeIteratorState {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_leaf`
[INFO] [stdout]    --> src/main.rs:166:8
[INFO] [stdout]     |
[INFO] [stdout] 166 |     fn is_leaf(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.32s
[INFO] running `Command { std: "docker" "inspect" "6207ef580765923ae755e51654b56002bfafd9b07245ff9cdbc699375828b7a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6207ef580765923ae755e51654b56002bfafd9b07245ff9cdbc699375828b7a9", kill_on_drop: false }`
[INFO] [stdout] 6207ef580765923ae755e51654b56002bfafd9b07245ff9cdbc699375828b7a9