[INFO] updating cached repository https://github.com/sjkillen/lp-lang
[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] 825945baa0c3d32275c84fca875cb013a01a41b0
[INFO] checking sjkillen/lp-lang against master#e22b61bff0bdd08be7665607cb7be3748c8a35d2 for pr-74627
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsjkillen%2Flp-lang" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sjkillen/lp-lang on toolchain e22b61bff0bdd08be7665607cb7be3748c8a35d2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+e22b61bff0bdd08be7665607cb7be3748c8a35d2" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/sjkillen/lp-lang
[INFO] finished tweaking git repo https://github.com/sjkillen/lp-lang
[INFO] tweaked toml for git repo https://github.com/sjkillen/lp-lang written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/sjkillen/lp-lang already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+e22b61bff0bdd08be7665607cb7be3748c8a35d2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+e22b61bff0bdd08be7665607cb7be3748c8a35d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 907faf3742af0b209f3ce0f5d9a27d5eed69205bc254575091e85be9e7d7ae98
[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" "907faf3742af0b209f3ce0f5d9a27d5eed69205bc254575091e85be9e7d7ae98", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "907faf3742af0b209f3ce0f5d9a27d5eed69205bc254575091e85be9e7d7ae98", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "907faf3742af0b209f3ce0f5d9a27d5eed69205bc254575091e85be9e7d7ae98", kill_on_drop: false }`
[INFO] [stdout] 907faf3742af0b209f3ce0f5d9a27d5eed69205bc254575091e85be9e7d7ae98
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=forbid" "-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" "+e22b61bff0bdd08be7665607cb7be3748c8a35d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", 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] 8d602b92826be0bf0bb75de87095ef859bee811ae30e0bde930138bf2ca5db72
[INFO] running `Command { std: "docker" "start" "-a" "8d602b92826be0bf0bb75de87095ef859bee811ae30e0bde930138bf2ca5db72", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.10
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.18
[INFO] [stderr]    Compiling ryu v1.0.4
[INFO] [stderr]    Compiling serde v1.0.106
[INFO] [stderr]     Checking itoa v0.4.5
[INFO] [stderr]     Checking either v1.5.3
[INFO] [stderr]     Checking uid v0.1.4
[INFO] [stderr]     Checking itertools v0.9.0
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]    Compiling serde_derive v1.0.106
[INFO] [stderr]     Checking serde_json v1.0.51
[INFO] [stderr]     Checking lp-lang v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `empty`
[INFO] [stdout]  --> src/util.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::iter::{empty, Peekable};
[INFO] [stdout]   |                 ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `empty`
[INFO] [stdout]  --> src/util.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::iter::{empty, Peekable};
[INFO] [stdout]   |                 ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `TermSeqTry`
[INFO] [stdout]  --> src/conflict.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub type TermSeqTry<'a> = Result<TermSeq, Conflict>;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `TermIter`
[INFO] [stdout]   --> src/grounding.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub type TermIter<'a> = Box<dyn Iterator<Item = Term> + 'a>;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `TermSeq`
[INFO] [stdout]  --> src/program.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub type TermSeq = Vec<Term>;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `TermSeqTry`
[INFO] [stdout]  --> src/conflict.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub type TermSeqTry<'a> = Result<TermSeq, Conflict>;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `TermIter`
[INFO] [stdout]   --> src/grounding.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub type TermIter<'a> = Box<dyn Iterator<Item = Term> + 'a>;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `TermSeq`
[INFO] [stdout]  --> src/program.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub type TermSeq = Vec<Term>;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 39.17s
[INFO] running `Command { std: "docker" "inspect" "8d602b92826be0bf0bb75de87095ef859bee811ae30e0bde930138bf2ca5db72", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d602b92826be0bf0bb75de87095ef859bee811ae30e0bde930138bf2ca5db72", kill_on_drop: false }`
[INFO] [stdout] 8d602b92826be0bf0bb75de87095ef859bee811ae30e0bde930138bf2ca5db72