[INFO] updating cached repository https://github.com/codesections/mnemonic
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c63b320f2a323cd661cc51ceb520f86c80cb8af9
[INFO] testing codesections/mnemonic against beta-2020-07-24 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcodesections%2Fmnemonic" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/codesections/mnemonic on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/codesections/mnemonic
[INFO] finished tweaking git repo https://github.com/codesections/mnemonic
[INFO] tweaked toml for git repo https://github.com/codesections/mnemonic written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/codesections/mnemonic already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+beta-2020-07-24" "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] 64eaa67ca0390c3edbd3d10566d8729e8e122c31e390b4514ab779b7bc853711
[INFO] running `Command { std: "docker" "start" "-a" "64eaa67ca0390c3edbd3d10566d8729e8e122c31e390b4514ab779b7bc853711", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "64eaa67ca0390c3edbd3d10566d8729e8e122c31e390b4514ab779b7bc853711", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "64eaa67ca0390c3edbd3d10566d8729e8e122c31e390b4514ab779b7bc853711", kill_on_drop: false }`
[INFO] [stdout] 64eaa67ca0390c3edbd3d10566d8729e8e122c31e390b4514ab779b7bc853711
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+beta-2020-07-24" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ef42a42d997a0d652ad8475ecbb2289411031474cb79751101c5022bb03e0f77
[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" "ef42a42d997a0d652ad8475ecbb2289411031474cb79751101c5022bb03e0f77", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling memchr v2.1.3
[INFO] [stderr]    Compiling proc-macro2 v0.4.26
[INFO] [stderr]    Compiling serde v1.0.85
[INFO] [stderr]    Compiling ident_case v1.0.0
[INFO] [stderr]    Compiling plist v0.3.0
[INFO] [stderr]    Compiling derive_builder v0.7.0
[INFO] [stderr]    Compiling either v1.5.0
[INFO] [stderr]    Compiling shell-words v0.1.0
[INFO] [stderr]    Compiling roff v0.1.0
[INFO] [stderr]    Compiling open v1.2.2
[INFO] [stderr]    Compiling ansi_colours v1.0.1
[INFO] [stderr]    Compiling colored v1.7.0
[INFO] [stderr]    Compiling rand v0.6.4
[INFO] [stderr]    Compiling onig_sys v69.1.0
[INFO] [stderr]    Compiling backtrace v0.3.13
[INFO] [stderr]    Compiling crossbeam-utils v0.6.5
[INFO] [stderr]    Compiling smallvec v0.6.8
[INFO] [stderr]    Compiling rand_os v0.1.1
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]    Compiling miniz-sys v0.1.11
[INFO] [stderr]    Compiling clicolors-control v0.2.0
[INFO] [stderr]    Compiling termios v0.3.1
[INFO] [stderr]    Compiling directories v1.0.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling float-cmp v0.4.0
[INFO] [stderr]    Compiling man v0.3.0
[INFO] [stderr]    Compiling clap v2.32.0
[INFO] [stderr]    Compiling chrono v0.4.6
[INFO] [stderr]    Compiling flate2 v1.0.6
[INFO] [stderr]    Compiling crossbeam-channel v0.3.8
[INFO] [stderr]    Compiling error-chain v0.12.0
[INFO] [stderr]    Compiling quote v0.6.11
[INFO] [stderr]    Compiling aho-corasick v0.6.9
[INFO] [stderr]    Compiling content_inspector v0.2.4
[INFO] [stderr]    Compiling combine v3.6.6
[INFO] [stderr]    Compiling syn v0.15.26
[INFO] [stderr]    Compiling regex v1.1.0
[INFO] [stderr]    Compiling parking_lot_core v0.4.0
[INFO] [stderr]    Compiling tempfile v3.0.5
[INFO] [stderr]    Compiling parking_lot v0.7.1
[INFO] [stderr]    Compiling globset v0.4.2
[INFO] [stderr]    Compiling console v0.6.2
[INFO] [stderr]    Compiling predicates v1.0.0
[INFO] [stderr]    Compiling ignore v0.4.6
[INFO] [stderr]    Compiling onig v4.3.1
[INFO] [stderr]    Compiling globwalk v0.5.0
[INFO] [stderr]    Compiling assert_fs v0.11.3
[INFO] [stderr]    Compiling bincode v1.0.1
[INFO] [stderr]    Compiling serde_json v1.0.37
[INFO] [stderr]    Compiling toml v0.4.10
[INFO] [stderr]    Compiling darling_core v0.8.3
[INFO] [stderr]    Compiling toml_edit v0.1.3
[INFO] [stderr]    Compiling serde_derive v1.0.85
[INFO] [stderr]    Compiling darling_macro v0.8.3
[INFO] [stdout] error[E0502]: cannot borrow `v` as immutable because it is also borrowed as mutable
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/toml_edit-0.1.3/src/index.rs:55:65
[INFO] [stdout]    |
[INFO] [stdout] 44 |       fn index_or_insert<'v>(&self, v: &'v mut Item) -> &'v mut Item {
[INFO] [stdout]    |                          -- lifetime `'v` defined here
[INFO] [stdout] 45 | /         match *v {
[INFO] [stdout] 46 | |             Item::ArrayOfTables(ref mut vec) => {
[INFO] [stdout] 47 | |                 vec.values.get_mut(*self).expect("index out of bounds")
[INFO] [stdout] 48 | |             }
[INFO] [stdout] 49 | |             Item::Value(ref mut a) if a.is_array() => a
[INFO] [stdout]    | |                         --------- mutable borrow occurs here
[INFO] [stdout] ...  |
[INFO] [stdout] 55 | |             _ => panic!("cannot access index {} in {:?}", self, v),
[INFO] [stdout]    | |                                                                 ^ immutable borrow occurs here
[INFO] [stdout] 56 | |         }
[INFO] [stdout]    | |_________- returning this value requires that `v.0` is borrowed for `'v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `v` as immutable because it is also borrowed as mutable
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/toml_edit-0.1.3/src/index.rs:88:63
[INFO] [stdout]    |
[INFO] [stdout] 70 |       fn index_or_insert<'v>(&self, v: &'v mut Item) -> &'v mut Item {
[INFO] [stdout]    |                          -- lifetime `'v` defined here
[INFO] [stdout] ...
[INFO] [stdout] 77 | /         match *v {
[INFO] [stdout] 78 | |             Item::Table(ref mut t) => t.entry(self).or_insert(Item::None),
[INFO] [stdout] 79 | |             Item::Value(ref mut v) if v.is_inline_table() => {
[INFO] [stdout]    | |                         --------- mutable borrow occurs here
[INFO] [stdout] 80 | |                 &mut v
[INFO] [stdout] ...  |
[INFO] [stdout] 88 | |             _ => panic!("cannot access key {} in {:?}", self, v),
[INFO] [stdout]    | |                                                               ^ immutable borrow occurs here
[INFO] [stdout] 89 | |         }
[INFO] [stdout]    | |_________- returning this value requires that `v.0` is borrowed for `'v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling darling v0.8.3
[INFO] [stderr]    Compiling derive_builder_core v0.4.0
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0502`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `toml_edit`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "ef42a42d997a0d652ad8475ecbb2289411031474cb79751101c5022bb03e0f77", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef42a42d997a0d652ad8475ecbb2289411031474cb79751101c5022bb03e0f77", kill_on_drop: false }`
[INFO] [stdout] ef42a42d997a0d652ad8475ecbb2289411031474cb79751101c5022bb03e0f77