[INFO] cloning repository https://github.com/felipesere/jsondiffers
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/felipesere/jsondiffers" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffelipesere%2Fjsondiffers", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffelipesere%2Fjsondiffers'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f18a55ac78b88b64ab7bd70c611d45d0351a0328
[INFO] checking felipesere/jsondiffers against master#5e3f1b148db5bfa27fee52464ae1f5d34c49d77b for pr-75502
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffelipesere%2Fjsondiffers" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/felipesere/jsondiffers on toolchain 5e3f1b148db5bfa27fee52464ae1f5d34c49d77b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/felipesere/jsondiffers
[INFO] finished tweaking git repo https://github.com/felipesere/jsondiffers
[INFO] tweaked toml for git repo https://github.com/felipesere/jsondiffers written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/felipesere/jsondiffers already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "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-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 98bd25f30fff8d64d405f96ea5d66d2ca1a18444c3784f652f7f5b4bfa12a4b3
[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" "98bd25f30fff8d64d405f96ea5d66d2ca1a18444c3784f652f7f5b4bfa12a4b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "98bd25f30fff8d64d405f96ea5d66d2ca1a18444c3784f652f7f5b4bfa12a4b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "98bd25f30fff8d64d405f96ea5d66d2ca1a18444c3784f652f7f5b4bfa12a4b3", kill_on_drop: false }`
[INFO] [stdout] 98bd25f30fff8d64d405f96ea5d66d2ca1a18444c3784f652f7f5b4bfa12a4b3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fbbcffa8bce2f3f1cac66663574abbfa4492b4b793de5676295a0b13fc62f6ce
[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" "fbbcffa8bce2f3f1cac66663574abbfa4492b4b793de5676295a0b13fc62f6ce", kill_on_drop: false }`
[INFO] [stderr]    Compiling ryu v0.2.7
[INFO] [stderr]     Checking itoa v0.4.3
[INFO] [stderr]     Checking maplit v1.0.1
[INFO] [stderr]     Checking serde_json v1.0.39
[INFO] [stderr]     Checking jsondiffers v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `stringify`
[INFO] [stdout]  --> src/printer.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn stringify(val: Value) -> String {
[INFO] [stdout]   |    ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print`
[INFO] [stdout]   --> src/printer.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn print(output: &mut String, value: Value) {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_object`
[INFO] [stdout]   --> src/printer.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn print_object(output: &mut String, object: Map<String, Value>) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_array`
[INFO] [stdout]   --> src/printer.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn print_array(output: &mut String, values: Vec<Value>) {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `string`
[INFO] [stdout]   --> src/printer.rs:48:4
[INFO] [stdout]    |
[INFO] [stdout] 48 | fn string(output: &mut String, value: &str) {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.82s
[INFO] running `Command { std: "docker" "inspect" "fbbcffa8bce2f3f1cac66663574abbfa4492b4b793de5676295a0b13fc62f6ce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fbbcffa8bce2f3f1cac66663574abbfa4492b4b793de5676295a0b13fc62f6ce", kill_on_drop: false }`
[INFO] [stdout] fbbcffa8bce2f3f1cac66663574abbfa4492b4b793de5676295a0b13fc62f6ce