[INFO] cloning repository https://github.com/Johan-Mi/stack_machine
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Johan-Mi/stack_machine" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJohan-Mi%2Fstack_machine", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJohan-Mi%2Fstack_machine'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 32560613d78c8a83742ebddc007ddcc8774c8954
[INFO] testing Johan-Mi/stack_machine against beta-2021-09-12 for beta-1.56-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJohan-Mi%2Fstack_machine" "/workspace/builds/worker-101/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-101/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Johan-Mi/stack_machine on toolchain beta-2021-09-12
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-12" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Johan-Mi/stack_machine
[INFO] finished tweaking git repo https://github.com/Johan-Mi/stack_machine
[INFO] tweaked toml for git repo https://github.com/Johan-Mi/stack_machine written to /workspace/builds/worker-101/source/Cargo.toml
[INFO] crate git repo https://github.com/Johan-Mi/stack_machine already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-12" "fetch" "--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-101/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-12" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] efae70cd05c9a2442fbf34768af680241d42e3a0a58daaad63a24210bdaf7557
[INFO] running `Command { std: "docker" "start" "-a" "efae70cd05c9a2442fbf34768af680241d42e3a0a58daaad63a24210bdaf7557", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "efae70cd05c9a2442fbf34768af680241d42e3a0a58daaad63a24210bdaf7557", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "efae70cd05c9a2442fbf34768af680241d42e3a0a58daaad63a24210bdaf7557", kill_on_drop: false }`
[INFO] [stdout] efae70cd05c9a2442fbf34768af680241d42e3a0a58daaad63a24210bdaf7557
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-12" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a89a6555f88a443b33fcd9d40b1615e989e9bdcd23b5c7f9665b4fe1f20de606
[INFO] running `Command { std: "docker" "start" "-a" "a89a6555f88a443b33fcd9d40b1615e989e9bdcd23b5c7f9665b4fe1f20de606", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.58
[INFO] [stderr]    Compiling itertools v0.10.0
[INFO] [stderr]    Compiling quote v1.0.8
[INFO] [stderr]    Compiling thiserror-impl v1.0.23
[INFO] [stderr]    Compiling derive_more v0.99.11
[INFO] [stderr]    Compiling thiserror v1.0.23
[INFO] [stderr]    Compiling stack_machine v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0034]: multiple applicable items in scope
[INFO] [stdout]   --> src/list.rs:33:18
[INFO] [stdout]    |
[INFO] [stdout] 33 |                 .intersperse(Cow::Borrowed(" "))
[INFO] [stdout]    |                  ^^^^^^^^^^^ multiple `intersperse` found
[INFO] [stdout]    |
[INFO] [stdout]    = note: candidate #1 is defined in an impl of the trait `Iterator` for the type `Map<I, F>`
[INFO] [stdout]    = note: candidate #2 is defined in an impl of the trait `Itertools` for the type `T`
[INFO] [stdout] help: disambiguate the associated function for candidate #1
[INFO] [stdout]    |
[INFO] [stdout] 31 ~             Iterator::intersperse(self.iter()
[INFO] [stdout] 32 +                 .map(|v| Cow::Owned(v.to_string())), Cow::Borrowed(" "))
[INFO] [stdout]    |
[INFO] [stdout] help: disambiguate the associated function for candidate #2
[INFO] [stdout]    |
[INFO] [stdout] 31 ~             Itertools::intersperse(self.iter()
[INFO] [stdout] 32 +                 .map(|v| Cow::Owned(v.to_string())), Cow::Borrowed(" "))
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0034]: multiple applicable items in scope
[INFO] [stdout]   --> src/machine.rs:77:18
[INFO] [stdout]    |
[INFO] [stdout] 77 |                 .intersperse(Cow::Borrowed(" "))
[INFO] [stdout]    |                  ^^^^^^^^^^^ multiple `intersperse` found
[INFO] [stdout]    |
[INFO] [stdout]    = note: candidate #1 is defined in an impl of the trait `Iterator` for the type `Map<I, F>`
[INFO] [stdout]    = note: candidate #2 is defined in an impl of the trait `Itertools` for the type `T`
[INFO] [stdout] help: disambiguate the associated function for candidate #1
[INFO] [stdout]    |
[INFO] [stdout] 74 ~             Iterator::intersperse(self.stack
[INFO] [stdout] 75 +                 .iter()
[INFO] [stdout] 76 +                 .map(|v| Cow::Owned(v.to_string())), Cow::Borrowed(" "))
[INFO] [stdout]    |
[INFO] [stdout] help: disambiguate the associated function for candidate #2
[INFO] [stdout]    |
[INFO] [stdout] 74 ~             Itertools::intersperse(self.stack
[INFO] [stdout] 75 +                 .iter()
[INFO] [stdout] 76 +                 .map(|v| Cow::Owned(v.to_string())), Cow::Borrowed(" "))
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `itertools::Itertools`
[INFO] [stdout]  --> src/list.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use itertools::Itertools;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `itertools::Itertools`
[INFO] [stdout]  --> src/machine.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use itertools::Itertools;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0034`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `stack_machine` due to 3 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "a89a6555f88a443b33fcd9d40b1615e989e9bdcd23b5c7f9665b4fe1f20de606", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a89a6555f88a443b33fcd9d40b1615e989e9bdcd23b5c7f9665b4fe1f20de606", kill_on_drop: false }`
[INFO] [stdout] a89a6555f88a443b33fcd9d40b1615e989e9bdcd23b5c7f9665b4fe1f20de606