[INFO] updating cached repository https://github.com/kimrutherford/pombase_rc_string
[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] cabbbc21a834a7b23adb5552fab390db75310568
[INFO] checking kimrutherford/pombase_rc_string against try#85cc1486e1f000dce4bb8e1b3cfab2b654b102a8 for pr-73323
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkimrutherford%2Fpombase_rc_string" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kimrutherford/pombase_rc_string on toolchain 85cc1486e1f000dce4bb8e1b3cfab2b654b102a8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+85cc1486e1f000dce4bb8e1b3cfab2b654b102a8" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kimrutherford/pombase_rc_string
[INFO] finished tweaking git repo https://github.com/kimrutherford/pombase_rc_string
[INFO] tweaked toml for git repo https://github.com/kimrutherford/pombase_rc_string written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/kimrutherford/pombase_rc_string already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+85cc1486e1f000dce4bb8e1b3cfab2b654b102a8" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+85cc1486e1f000dce4bb8e1b3cfab2b654b102a8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 70f67d8e99164fb251585ae28ee654ce9e524e4086ca63190fdc8003e6417e27
[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" "70f67d8e99164fb251585ae28ee654ce9e524e4086ca63190fdc8003e6417e27", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "70f67d8e99164fb251585ae28ee654ce9e524e4086ca63190fdc8003e6417e27", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "70f67d8e99164fb251585ae28ee654ce9e524e4086ca63190fdc8003e6417e27", kill_on_drop: false }`
[INFO] [stdout] 70f67d8e99164fb251585ae28ee654ce9e524e4086ca63190fdc8003e6417e27
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+85cc1486e1f000dce4bb8e1b3cfab2b654b102a8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7d1c157c3662a994da42b7537b71fa2df15991f27252c7f7a98e35b5909b319f
[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" "7d1c157c3662a994da42b7537b71fa2df15991f27252c7f7a98e35b5909b319f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.13
[INFO] [stderr]    Compiling version_check v0.1.4
[INFO] [stderr]    Compiling ryu v0.2.5
[INFO] [stderr]     Checking weak-table v0.2.3
[INFO] [stderr]     Checking serde v1.0.75
[INFO] [stderr]    Compiling lazy_static v1.1.0
[INFO] [stderr]    Compiling quote v0.6.8
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling serde_derive v1.0.75
[INFO] [stderr]     Checking serde_json v1.0.26
[INFO] [stderr]     Checking pombase_rc_string v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: static variable `cache` should have an upper case name
[INFO] [stdout]   --> src/lib.rs:24:16
[INFO] [stdout]    |
[INFO] [stdout] 24 |     static ref cache: Mutex<WeakHashSet<Weak<String>>> = Mutex::new(WeakHashSet::new());
[INFO] [stdout]    |                ^^^^^ help: convert the identifier to upper case: `CACHE`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static variable `cache` should have an upper case name
[INFO] [stdout]   --> src/lib.rs:24:16
[INFO] [stdout]    |
[INFO] [stdout] 24 |     static ref cache: Mutex<WeakHashSet<Weak<String>>> = Mutex::new(WeakHashSet::new());
[INFO] [stdout]    |                ^^^^^ help: convert the identifier to upper case: `CACHE`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 24.34s
[INFO] running `Command { std: "docker" "inspect" "7d1c157c3662a994da42b7537b71fa2df15991f27252c7f7a98e35b5909b319f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d1c157c3662a994da42b7537b71fa2df15991f27252c7f7a98e35b5909b319f", kill_on_drop: false }`
[INFO] [stdout] 7d1c157c3662a994da42b7537b71fa2df15991f27252c7f7a98e35b5909b319f