[INFO] fetching crate johnston 0.2.1...
[INFO] checking johnston-0.2.1 against try#f6e2f78768c57172b99c3e85892f867894dc7e30 for pr-75502
[INFO] extracting crate johnston 0.2.1 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate johnston 0.2.1 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 crates.io crate johnston 0.2.1
[INFO] finished tweaking crates.io crate johnston 0.2.1
[INFO] tweaked toml for crates.io crate johnston 0.2.1 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate crates.io crate johnston 0.2.1 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-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 7121cd9128318dbddaaace33fc73a5aa29a2029e3b2d39e2bf9ae069cd25390f
[INFO] running `Command { std: "docker" "start" "-a" "7121cd9128318dbddaaace33fc73a5aa29a2029e3b2d39e2bf9ae069cd25390f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7121cd9128318dbddaaace33fc73a5aa29a2029e3b2d39e2bf9ae069cd25390f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7121cd9128318dbddaaace33fc73a5aa29a2029e3b2d39e2bf9ae069cd25390f", kill_on_drop: false }`
[INFO] [stdout] 7121cd9128318dbddaaace33fc73a5aa29a2029e3b2d39e2bf9ae069cd25390f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] [stdout] 36f14b55b00dab41f4e155388cb26cf6a6add0aa014a5c0a590da1a4b230fe13
[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" "36f14b55b00dab41f4e155388cb26cf6a6add0aa014a5c0a590da1a4b230fe13", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]     Checking itoa v0.4.5
[INFO] [stderr]    Compiling proc-macro2 v1.0.9
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling num-rational v0.2.3
[INFO] [stderr]    Compiling num-iter v0.1.40
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking num v0.2.1
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]     Checking serde v1.0.104
[INFO] [stderr]     Checking serde_json v1.0.48
[INFO] [stderr]     Checking johnston v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `factors`
[INFO] [stdout]    --> src/lib.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn factors(num: i32) -> Vec<i32> {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `prime`
[INFO] [stdout]    --> src/lib.rs:120:4
[INFO] [stdout]     |
[INFO] [stdout] 120 | fn prime(num: i32) -> bool {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `power_of_two`
[INFO] [stdout]    --> src/lib.rs:130:4
[INFO] [stdout]     |
[INFO] [stdout] 130 | fn power_of_two(num: i32) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `gpf`
[INFO] [stdout]    --> src/lib.rs:134:4
[INFO] [stdout]     |
[INFO] [stdout] 134 | fn gpf(num: i32) -> i32 {
[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 42.07s
[INFO] running `Command { std: "docker" "inspect" "36f14b55b00dab41f4e155388cb26cf6a6add0aa014a5c0a590da1a4b230fe13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "36f14b55b00dab41f4e155388cb26cf6a6add0aa014a5c0a590da1a4b230fe13", kill_on_drop: false }`
[INFO] [stdout] 36f14b55b00dab41f4e155388cb26cf6a6add0aa014a5c0a590da1a4b230fe13