[INFO] cloning repository https://github.com/felix-hedenstrom/ngramfiller
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/felix-hedenstrom/ngramfiller" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffelix-hedenstrom%2Fngramfiller", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffelix-hedenstrom%2Fngramfiller'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c5f2944db09e55f0f7bebb81c695e3cbedc11440
[INFO] testing felix-hedenstrom/ngramfiller against 1.45.2 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffelix-hedenstrom%2Fngramfiller" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/felix-hedenstrom/ngramfiller on toolchain 1.45.2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/felix-hedenstrom/ngramfiller
[INFO] finished tweaking git repo https://github.com/felix-hedenstrom/ngramfiller
[INFO] tweaked toml for git repo https://github.com/felix-hedenstrom/ngramfiller written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/felix-hedenstrom/ngramfiller already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "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-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 50db06ca3fb004b6d57cef67ff20cb2e3c243dd6a90eb14aa33b1f48bc051735
[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" "50db06ca3fb004b6d57cef67ff20cb2e3c243dd6a90eb14aa33b1f48bc051735", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "50db06ca3fb004b6d57cef67ff20cb2e3c243dd6a90eb14aa33b1f48bc051735", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "50db06ca3fb004b6d57cef67ff20cb2e3c243dd6a90eb14aa33b1f48bc051735", kill_on_drop: false }`
[INFO] [stdout] 50db06ca3fb004b6d57cef67ff20cb2e3c243dd6a90eb14aa33b1f48bc051735
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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=warn" "-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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9b6187e5810407d6d84def1b8db1c9dbcf3801072017175847e26c26067d7a3c
[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" "9b6187e5810407d6d84def1b8db1c9dbcf3801072017175847e26c26067d7a3c", 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] [stderr]    Compiling lazy_static v1.3.0
[INFO] [stderr]    Compiling utf8-ranges v1.0.3
[INFO] [stderr]    Compiling autocfg v0.1.5
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]    Compiling cpython v0.2.1 (https://github.com/dgrunwald/rust-cpython#c5cfd32c)
[INFO] [stderr]    Compiling regex-syntax v0.6.10
[INFO] [stderr]    Compiling aho-corasick v0.7.4
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling regex v1.2.0
[INFO] [stderr]    Compiling python3-sys v0.2.1 (https://github.com/dgrunwald/rust-cpython#c5cfd32c)
[INFO] [stderr]    Compiling ngramconnector v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated item 'r#try': use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:74:9
[INFO] [stdout]    |
[INFO] [stdout] 74 |         r#try!(m.add(py, "__doc__", "This module is implemented in Rust"));
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'r#try': use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |         r#try!(m.add(py, "depth", py_fn!(py, depth(val: PyDict))));
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'r#try': use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:76:9
[INFO] [stdout]    |
[INFO] [stdout] 76 |         r#try!(m.add(
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0499]: cannot borrow `ngrams` as mutable more than once at a time
[INFO] [stdout]   --> src/graph.rs:38:17
[INFO] [stdout]    |
[INFO] [stdout] 38 |                 ngrams.push(neighbor);
[INFO] [stdout]    |                 ^^^^^^ second mutable borrow occurs here
[INFO] [stdout] 39 |                 let neighbor_p = ngrams.last_mut().unwrap();
[INFO] [stdout]    |                                  ------ first mutable borrow occurs here
[INFO] [stdout] 40 | 
[INFO] [stdout] 41 |                 if !visited.insert(neighbor_p){
[INFO] [stdout]    |                     ------- first borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0499]: cannot borrow `ngrams` as mutable more than once at a time
[INFO] [stdout]   --> src/graph.rs:39:34
[INFO] [stdout]    |
[INFO] [stdout] 39 |                 let neighbor_p = ngrams.last_mut().unwrap();
[INFO] [stdout]    |                                  ^^^^^^ mutable borrow starts here in previous iteration of loop
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0499`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ngramconnector`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "9b6187e5810407d6d84def1b8db1c9dbcf3801072017175847e26c26067d7a3c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9b6187e5810407d6d84def1b8db1c9dbcf3801072017175847e26c26067d7a3c", kill_on_drop: false }`
[INFO] [stdout] 9b6187e5810407d6d84def1b8db1c9dbcf3801072017175847e26c26067d7a3c