[INFO] cloning repository https://github.com/eternal-io/keon
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/eternal-io/keon" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Feternal-io%2Fkeon", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Feternal-io%2Fkeon'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a9f7becf02695fa66f2c9caab3b6090ea11625f9
[INFO] checking eternal-io/keon against try#c4ca24658d934444a28db36abebef17a8651701a for pr-144156
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Feternal-io%2Fkeon" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/eternal-io/keon
[INFO] finished tweaking git repo https://github.com/eternal-io/keon
[INFO] tweaked toml for git repo https://github.com/eternal-io/keon written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/eternal-io/keon on toolchain c4ca24658d934444a28db36abebef17a8651701a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c4ca24658d934444a28db36abebef17a8651701a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/eternal-io/keon 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" "+c4ca24658d934444a28db36abebef17a8651701a" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded logos-derive v0.15.0
[INFO] [stderr]   Downloaded logos-codegen v0.15.0
[INFO] [stderr]   Downloaded logos v0.15.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+c4ca24658d934444a28db36abebef17a8651701a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5a4d9c16f52c6640e94c1d0510af58362341a26e0366a7ef99511dc94b36a163
[INFO] running `Command { std: "docker" "start" "-a" "5a4d9c16f52c6640e94c1d0510af58362341a26e0366a7ef99511dc94b36a163", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5a4d9c16f52c6640e94c1d0510af58362341a26e0366a7ef99511dc94b36a163", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5a4d9c16f52c6640e94c1d0510af58362341a26e0366a7ef99511dc94b36a163", kill_on_drop: false }`
[INFO] [stdout] 5a4d9c16f52c6640e94c1d0510af58362341a26e0366a7ef99511dc94b36a163
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+c4ca24658d934444a28db36abebef17a8651701a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f86e04a738cfa1d9504c4be5c7ee8e3414ba64be1cf07ecc57a198f6c07adf2b
[INFO] running `Command { std: "docker" "start" "-a" "f86e04a738cfa1d9504c4be5c7ee8e3414ba64be1cf07ecc57a198f6c07adf2b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.87
[INFO] [stderr]    Compiling unicode-ident v1.0.13
[INFO] [stderr]    Compiling semver v1.0.25
[INFO] [stderr]     Checking static_assertions v1.1.0
[INFO] [stderr]    Compiling serde v1.0.217
[INFO] [stderr]    Compiling lazy_static v1.5.0
[INFO] [stderr]    Compiling regex-syntax v0.8.5
[INFO] [stderr]    Compiling beef v0.5.2
[INFO] [stderr]     Checking lexical-util v1.0.3
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling serde_json v1.0.137
[INFO] [stderr]     Checking memchr v2.7.4
[INFO] [stderr]     Checking smol_str v0.3.2
[INFO] [stderr]     Checking ryu v1.0.18
[INFO] [stderr]     Checking data-encoding v2.6.0
[INFO] [stderr]     Checking itoa v1.0.14
[INFO] [stderr]    Compiling rustc_version v0.4.1
[INFO] [stderr]    Compiling logos-codegen v0.15.0
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]     Checking lexical-write-integer v1.0.2
[INFO] [stderr]     Checking lexical-parse-integer v1.0.2
[INFO] [stderr]    Compiling syn v2.0.87
[INFO] [stderr]     Checking lexical-parse-float v1.0.2
[INFO] [stderr]     Checking lexical-write-float v1.0.2
[INFO] [stderr]     Checking lexical-core v1.0.2
[INFO] [stderr]    Compiling serde_derive v1.0.217
[INFO] [stderr]    Compiling logos-derive v0.15.0
[INFO] [stderr]     Checking logos v0.15.0
[INFO] [stderr]     Checking serde_bytes v0.11.15
[INFO] [stderr]     Checking keon v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/de.rs:107:13
[INFO] [stdout]     |
[INFO] [stdout] 107 |     fn next(&mut self) -> Result