[INFO] fetching crate vboxhelper 0.2.0...
[INFO] checking vboxhelper-0.2.0 against try#b20a093d9fb1ffaa04ae9852cb034864a992bafd for pr-85073
[INFO] extracting crate vboxhelper 0.2.0 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate vboxhelper 0.2.0 on toolchain b20a093d9fb1ffaa04ae9852cb034864a992bafd
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b20a093d9fb1ffaa04ae9852cb034864a992bafd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate vboxhelper 0.2.0
[INFO] finished tweaking crates.io crate vboxhelper 0.2.0
[INFO] tweaked toml for crates.io crate vboxhelper 0.2.0 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate crates.io crate vboxhelper 0.2.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b20a093d9fb1ffaa04ae9852cb034864a992bafd" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+b20a093d9fb1ffaa04ae9852cb034864a992bafd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 55f1ef46ba1936992e67c3796c00d68ee0bdddb483c9e06c3c8b29dfa82fcd01
[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" "55f1ef46ba1936992e67c3796c00d68ee0bdddb483c9e06c3c8b29dfa82fcd01", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "55f1ef46ba1936992e67c3796c00d68ee0bdddb483c9e06c3c8b29dfa82fcd01", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "55f1ef46ba1936992e67c3796c00d68ee0bdddb483c9e06c3c8b29dfa82fcd01", kill_on_drop: false }`
[INFO] [stdout] 55f1ef46ba1936992e67c3796c00d68ee0bdddb483c9e06c3c8b29dfa82fcd01
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+b20a093d9fb1ffaa04ae9852cb034864a992bafd" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 03bb774d16c78710c52d3140025c7e084037ea3dbe0a20f4268bef7a34a04e8e
[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" "03bb774d16c78710c52d3140025c7e084037ea3dbe0a20f4268bef7a34a04e8e", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]     Checking uuid v0.8.1
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking aho-corasick v0.7.13
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking eui48 v1.1.0
[INFO] [stderr]     Checking vboxhelper v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `re_ml1`
[INFO] [stdout]    --> src/lib.rs:207:7
[INFO] [stdout]     |
[INFO] [stdout] 207 |   let re_ml1 = Regex::new(r#"^(?P<key>[^"=]+)="(?P<val>[^"=]*)"$"#).unwrap();
[INFO] [stdout]     |       ^^^^^^ help: if this is intentional, prefix it with an underscore: `_re_ml1`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `re_ml1`
[INFO] [stdout]    --> src/lib.rs:208:7
[INFO] [stdout]     |
[INFO] [stdout] 208 |   let re_ml1 = Regex::new(r#"^"(?P<key>[^"=]+)"="(?P<val>[^"=]*)"$"#).unwrap();
[INFO] [stdout]     |       ^^^^^^ help: if this is intentional, prefix it with an underscore: `_re_ml1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `root_uuid` is never read
[INFO] [stdout]    --> src/snapshot.rs:200:11
[INFO] [stdout]     |
[INFO] [stdout] 200 |   let mut root_uuid: Option<uuid::Uuid> = None;
[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 `current_uuid` is never read
[INFO] [stdout]    --> src/snapshot.rs:201:11
[INFO] [stdout]     |
[INFO] [stdout] 201 |   let mut current_uuid: Option<uuid::Uuid> = None;
[INFO] [stdout]     |           ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `re_ml1`
[INFO] [stdout]    --> src/lib.rs:207:7
[INFO] [stdout]     |
[INFO] [stdout] 207 |   let re_ml1 = Regex::new(r#"^(?P<key>[^"=]+)="(?P<val>[^"=]*)"$"#).unwrap();
[INFO] [stdout]     |       ^^^^^^ help: if this is intentional, prefix it with an underscore: `_re_ml1`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `re_ml1`
[INFO] [stdout]    --> src/lib.rs:208:7
[INFO] [stdout]     |
[INFO] [stdout] 208 |   let re_ml1 = Regex::new(r#"^"(?P<key>[^"=]+)"="(?P<val>[^"=]*)"$"#).unwrap();
[INFO] [stdout]     |       ^^^^^^ help: if this is intentional, prefix it with an underscore: `_re_ml1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `root_uuid` is never read
[INFO] [stdout]    --> src/snapshot.rs:200:11
[INFO] [stdout]     |
[INFO] [stdout] 200 |   let mut root_uuid: Option<uuid::Uuid> = None;
[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 `current_uuid` is never read
[INFO] [stdout]    --> src/snapshot.rs:201:11
[INFO] [stdout]     |
[INFO] [stdout] 201 |   let mut current_uuid: Option<uuid::Uuid> = None;
[INFO] [stdout]     |           ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Keep`
[INFO] [stdout]  --> src/strutils.rs:3:3
[INFO] [stdout]   |
[INFO] [stdout] 3 |   Keep,
[INFO] [stdout]   |   ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Keep`
[INFO] [stdout]  --> src/strutils.rs:3:3
[INFO] [stdout]   |
[INFO] [stdout] 3 |   Keep,
[INFO] [stdout]   |   ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.26s
[INFO] running `Command { std: "docker" "inspect" "03bb774d16c78710c52d3140025c7e084037ea3dbe0a20f4268bef7a34a04e8e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "03bb774d16c78710c52d3140025c7e084037ea3dbe0a20f4268bef7a34a04e8e", kill_on_drop: false }`
[INFO] [stdout] 03bb774d16c78710c52d3140025c7e084037ea3dbe0a20f4268bef7a34a04e8e