[INFO] fetching crate encoding-next-index-singlebyte 1.20180106.0...
[INFO] testing encoding-next-index-singlebyte-1.20180106.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate encoding-next-index-singlebyte 1.20180106.0 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate encoding-next-index-singlebyte 1.20180106.0
[INFO] finished tweaking crates.io crate encoding-next-index-singlebyte 1.20180106.0
[INFO] tweaked toml for crates.io crate encoding-next-index-singlebyte 1.20180106.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate encoding-next-index-singlebyte 1.20180106.0 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 1 package to latest compatible version
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded encoding-next_index_tests v0.1.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ce9161e4acd606a4cd40b3172512606c30a837711294de1b57e575e67fc69798
[INFO] running `Command { std: "docker" "start" "-a" "ce9161e4acd606a4cd40b3172512606c30a837711294de1b57e575e67fc69798", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ce9161e4acd606a4cd40b3172512606c30a837711294de1b57e575e67fc69798", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce9161e4acd606a4cd40b3172512606c30a837711294de1b57e575e67fc69798", kill_on_drop: false }`
[INFO] [stdout] ce9161e4acd606a4cd40b3172512606c30a837711294de1b57e575e67fc69798
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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=warn" "-e" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 69e92ffe2acbbf3725be62c124bb5ac25a84c2915a0d50d0bb784b3da944fc76
[INFO] running `Command { std: "docker" "start" "-a" "69e92ffe2acbbf3725be62c124bb5ac25a84c2915a0d50d0bb784b3da944fc76", kill_on_drop: false }`
[INFO] [stderr]    Compiling encoding-next-index-singlebyte v1.20180106.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.25s
[INFO] running `Command { std: "docker" "inspect" "69e92ffe2acbbf3725be62c124bb5ac25a84c2915a0d50d0bb784b3da944fc76", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69e92ffe2acbbf3725be62c124bb5ac25a84c2915a0d50d0bb784b3da944fc76", kill_on_drop: false }`
[INFO] [stdout] 69e92ffe2acbbf3725be62c124bb5ac25a84c2915a0d50d0bb784b3da944fc76
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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=warn" "-e" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6a444f9214c7914dbc02a2be54ba0d59a90013733f105bc905e8497ba176c620
[INFO] running `Command { std: "docker" "start" "-a" "6a444f9214c7914dbc02a2be54ba0d59a90013733f105bc905e8497ba176c620", kill_on_drop: false }`
[INFO] [stderr]    Compiling encoding-next_index_tests v0.1.5
[INFO] [stderr]    Compiling encoding-next-index-singlebyte v1.20180106.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> lib.rs:9:19
[INFO] [stdout]   |
[INFO] [stdout] 9 | #![cfg_attr(test, feature(test))]
[INFO] [stdout]   |                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `encoding-next-index-singlebyte` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "6a444f9214c7914dbc02a2be54ba0d59a90013733f105bc905e8497ba176c620", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6a444f9214c7914dbc02a2be54ba0d59a90013733f105bc905e8497ba176c620", kill_on_drop: false }`
[INFO] [stdout] 6a444f9214c7914dbc02a2be54ba0d59a90013733f105bc905e8497ba176c620