[INFO] updating cached repository https://github.com/chrisshyi/kosarajuSCC
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fd8d6e8222600650dfcde4949060a7d698a8a26c
[INFO] checking chrisshyi/kosarajuSCC against try#5fdfba63a96c5e8ae0ebf6b8b66853110277087d for pr-73166
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchrisshyi%2FkosarajuSCC" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/chrisshyi/kosarajuSCC on toolchain 5fdfba63a96c5e8ae0ebf6b8b66853110277087d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5fdfba63a96c5e8ae0ebf6b8b66853110277087d" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/chrisshyi/kosarajuSCC
[INFO] finished tweaking git repo https://github.com/chrisshyi/kosarajuSCC
[INFO] tweaked toml for git repo https://github.com/chrisshyi/kosarajuSCC written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/chrisshyi/kosarajuSCC already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5fdfba63a96c5e8ae0ebf6b8b66853110277087d" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+5fdfba63a96c5e8ae0ebf6b8b66853110277087d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c9134a8a2d82ae18a8fc5e938d3b1ee2660534dd9aaddf1a1f1742935b17b64b
[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" "c9134a8a2d82ae18a8fc5e938d3b1ee2660534dd9aaddf1a1f1742935b17b64b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c9134a8a2d82ae18a8fc5e938d3b1ee2660534dd9aaddf1a1f1742935b17b64b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c9134a8a2d82ae18a8fc5e938d3b1ee2660534dd9aaddf1a1f1742935b17b64b", kill_on_drop: false }`
[INFO] [stdout] c9134a8a2d82ae18a8fc5e938d3b1ee2660534dd9aaddf1a1f1742935b17b64b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+5fdfba63a96c5e8ae0ebf6b8b66853110277087d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f00c08f92df003ec55e7afb5b2e155aeb383113b07d8e7f00148658380abb515
[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" "f00c08f92df003ec55e7afb5b2e155aeb383113b07d8e7f00148658380abb515", kill_on_drop: false }`
[INFO] [stderr]     Checking kosarajuSCC v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `tail_vertx` is never read
[INFO] [stdout]   --> src/lib.rs:34:10
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let (mut tail_vertx, mut head_vertx) = (0, 0); // Compiler won't allow use of uninitialized variables
[INFO] [stdout]    |          ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `head_vertx` is never read
[INFO] [stdout]   --> src/lib.rs:34:26
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let (mut tail_vertx, mut head_vertx) = (0, 0); // Compiler won't allow use of uninitialized variables
[INFO] [stdout]    |                          ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `tail_vertx` is never read
[INFO] [stdout]    --> src/lib.rs:137:10
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let (mut tail_vertx, mut head_vertx) = (0, 0); // Compiler won't allow use of uninitialized variables
[INFO] [stdout]     |          ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `head_vertx` is never read
[INFO] [stdout]    --> src/lib.rs:137:26
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let (mut tail_vertx, mut head_vertx) = (0, 0); // Compiler won't allow use of uninitialized variables
[INFO] [stdout]     |                          ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `kosarajuSCC` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `kosaraju_scc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `tail_vertx` is never read
[INFO] [stdout]   --> src/lib.rs:34:10
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let (mut tail_vertx, mut head_vertx) = (0, 0); // Compiler won't allow use of uninitialized variables
[INFO] [stdout]    |          ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `head_vertx` is never read
[INFO] [stdout]   --> src/lib.rs:34:26
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let (mut tail_vertx, mut head_vertx) = (0, 0); // Compiler won't allow use of uninitialized variables
[INFO] [stdout]    |                          ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `tail_vertx` is never read
[INFO] [stdout]    --> src/lib.rs:137:10
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let (mut tail_vertx, mut head_vertx) = (0, 0); // Compiler won't allow use of uninitialized variables
[INFO] [stdout]     |          ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `head_vertx` is never read
[INFO] [stdout]    --> src/lib.rs:137:26
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let (mut tail_vertx, mut head_vertx) = (0, 0); // Compiler won't allow use of uninitialized variables
[INFO] [stdout]     |                          ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fs::File`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::fs::File;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fs::File`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::fs::File;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `kosarajuSCC` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `kosaraju_scc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `kosarajuSCC` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `kosaraju_scc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `kosarajuSCC` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `kosaraju_scc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.73s
[INFO] running `Command { std: "docker" "inspect" "f00c08f92df003ec55e7afb5b2e155aeb383113b07d8e7f00148658380abb515", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f00c08f92df003ec55e7afb5b2e155aeb383113b07d8e7f00148658380abb515", kill_on_drop: false }`
[INFO] [stdout] f00c08f92df003ec55e7afb5b2e155aeb383113b07d8e7f00148658380abb515