[INFO] cloning repository https://github.com/korir248/smart-pointers
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/korir248/smart-pointers" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkorir248%2Fsmart-pointers", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkorir248%2Fsmart-pointers'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b6238becc6d520f39fd1c30a25fb458138d67298
[INFO] checking korir248/smart-pointers against try#7d2afcda7a9c043d5175cbca3ab08f0acf02b13a for pr-140824
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkorir248%2Fsmart-pointers" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/korir248/smart-pointers on toolchain 7d2afcda7a9c043d5175cbca3ab08f0acf02b13a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7d2afcda7a9c043d5175cbca3ab08f0acf02b13a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/korir248/smart-pointers
[INFO] finished tweaking git repo https://github.com/korir248/smart-pointers
[INFO] tweaked toml for git repo https://github.com/korir248/smart-pointers written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/korir248/smart-pointers already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7d2afcda7a9c043d5175cbca3ab08f0acf02b13a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+7d2afcda7a9c043d5175cbca3ab08f0acf02b13a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a3ca5a979e17e3e35baae145099fd728154a0be08040cc6ff8c7e02ff692c2e5
[INFO] running `Command { std: "docker" "start" "-a" "a3ca5a979e17e3e35baae145099fd728154a0be08040cc6ff8c7e02ff692c2e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a3ca5a979e17e3e35baae145099fd728154a0be08040cc6ff8c7e02ff692c2e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a3ca5a979e17e3e35baae145099fd728154a0be08040cc6ff8c7e02ff692c2e5", kill_on_drop: false }`
[INFO] [stdout] a3ca5a979e17e3e35baae145099fd728154a0be08040cc6ff8c7e02ff692c2e5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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" "RUSTDOCFLAGS=--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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+7d2afcda7a9c043d5175cbca3ab08f0acf02b13a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8c85c97e69a5f05f36775280dbf85193b4b2cff52e2f93d1cc7edbfc7e3b6b6f
[INFO] running `Command { std: "docker" "start" "-a" "8c85c97e69a5f05f36775280dbf85193b4b2cff52e2f93d1cc7edbfc7e3b6b6f", kill_on_drop: false }`
[INFO] [stderr]     Checking smart_pointers v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0599]: no method named `len` found for struct `RefCell` in the current scope
[INFO] [stdout]   --> src/lib.rs:70:49
[INFO] [stdout]    |
[INFO] [stdout] 70 |         assert_eq!(mock_messenger.sent_messages.len(), 1);
[INFO] [stdout]    |                                                 ^^^
[INFO] [stdout]    |
[INFO] [stdout] note: the method `len` exists on the type `Vec<String>`
[INFO] [stdout]   --> /rustc/7d2afcda7a9c043d5175cbca3ab08f0acf02b13a/library/alloc/src/vec/mod.rs:2705:5
[INFO] [stdout] help: there is a method `le` with a similar name, but with different arguments
[INFO] [stdout]   --> /rustc/7d2afcda7a9c043d5175cbca3ab08f0acf02b13a/library/core/src/cmp.rs:1400:5
[INFO] [stdout] help: use `.borrow()` to borrow the `Vec<String>`, panicking if a mutable borrow exists
[INFO] [stdout]    |
[INFO] [stdout] 70 |         assert_eq!(mock_messenger.sent_messages.borrow().len(), 1);
[INFO] [stdout]    |                                                +++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `smart_pointers` (lib test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "8c85c97e69a5f05f36775280dbf85193b4b2cff52e2f93d1cc7edbfc7e3b6b6f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c85c97e69a5f05f36775280dbf85193b4b2cff52e2f93d1cc7edbfc7e3b6b6f", kill_on_drop: false }`
[INFO] [stdout] 8c85c97e69a5f05f36775280dbf85193b4b2cff52e2f93d1cc7edbfc7e3b6b6f