[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] checking felix-hedenstrom/ngramfiller against master#506512391b1a75ae450d36c9420978402a91abcc for pr-125384
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffelix-hedenstrom%2Fngramfiller" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/felix-hedenstrom/ngramfiller on toolchain 506512391b1a75ae450d36c9420978402a91abcc
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-6-tc1/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: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/dgrunwald/rust-cpython`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded utf8-ranges v1.0.3
[INFO] [stderr]   Downloaded aho-corasick v0.7.4
[INFO] [stderr]   Downloaded ucd-util v0.1.5
[INFO] [stderr]   Downloaded regex v1.2.0
[INFO] [stderr]   Downloaded regex-syntax v0.6.10
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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:beeedbb442662e57d416641ecc3200b38e573c25b057896194468d05594dd835" "/opt/rustwide/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f409b24b5c2cd65360c2aa2ad2f8407602847da454d313f8011a0e324713b9f9
[INFO] running `Command { std: "docker" "start" "-a" "f409b24b5c2cd65360c2aa2ad2f8407602847da454d313f8011a0e324713b9f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f409b24b5c2cd65360c2aa2ad2f8407602847da454d313f8011a0e324713b9f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f409b24b5c2cd65360c2aa2ad2f8407602847da454d313f8011a0e324713b9f9", kill_on_drop: false }`
[INFO] [stdout] f409b24b5c2cd65360c2aa2ad2f8407602847da454d313f8011a0e324713b9f9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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=allow" "-e" "RUSTDOCFLAGS=--cap-lints=allow" "-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:beeedbb442662e57d416641ecc3200b38e573c25b057896194468d05594dd835" "/opt/rustwide/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a78a1c5142398b2185df78498156e6c5add2718ee51feadc603187e75668e1a4
[INFO] running `Command { std: "docker" "start" "-a" "a78a1c5142398b2185df78498156e6c5add2718ee51feadc603187e75668e1a4", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling ucd-util v0.1.5
[INFO] [stderr]    Compiling lazy_static v1.3.0
[INFO] [stderr]    Compiling utf8-ranges v1.0.3
[INFO] [stderr]    Compiling cpython v0.2.1 (https://github.com/dgrunwald/rust-cpython#c5cfd32c)
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling regex-syntax v0.6.10
[INFO] [stderr]    Compiling aho-corasick v0.7.4
[INFO] [stderr]    Compiling regex v1.2.0
[INFO] [stderr]    Compiling python3-sys v0.2.1 (https://github.com/dgrunwald/rust-cpython#c5cfd32c)
[INFO] [stderr]     Checking ngramconnector v0.1.0 (/opt/rustwide/workdir)
[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]    |                                  ^^^^^^ `ngrams` was mutably borrowed here in the previous iteration of the loop
[INFO] [stdout] 40 |
[INFO] [stdout] 41 |                 if !visited.insert(neighbor_p){
[INFO] [stdout]    |                     ------- first borrow used here, in later iteration of loop
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0499`.
[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]    |                                  ^^^^^^ `ngrams` was mutably borrowed here in the previous iteration of the loop
[INFO] [stdout] 40 |
[INFO] [stdout] 41 |                 if !visited.insert(neighbor_p){
[INFO] [stdout]    |                     ------- first borrow used here, in later iteration of loop
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ngramconnector` (lib) due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to 2 previous errors
[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` (lib test) due to 3 previous errors; 34 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "a78a1c5142398b2185df78498156e6c5add2718ee51feadc603187e75668e1a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a78a1c5142398b2185df78498156e6c5add2718ee51feadc603187e75668e1a4", kill_on_drop: false }`
[INFO] [stdout] a78a1c5142398b2185df78498156e6c5add2718ee51feadc603187e75668e1a4