[INFO] fetching crate esl 0.18.0...
[INFO] testing esl-0.18.0 against 1.75.0 for beta-1.76-1
[INFO] extracting crate esl 0.18.0 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate esl 0.18.0 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate esl 0.18.0
[INFO] finished tweaking crates.io crate esl 0.18.0
[INFO] tweaked toml for crates.io crate esl 0.18.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded macro-attr-2018 v3.0.0
[INFO] [stderr]   Downloaded enum-derive-2018 v3.0.1
[INFO] [stderr]   Downloaded enumn v0.1.13
[INFO] [stderr]   Downloaded litrs v0.4.1
[INFO] [stderr]   Downloaded document-features v0.2.8
[INFO] [stderr]   Downloaded educe v0.4.23
[INFO] [stderr]   Downloaded enum-ordinalize v3.1.15
[INFO] [stderr]   Downloaded iter-identify_first_last v0.2.0
[INFO] [stderr]   Downloaded phantom-type v0.4.2
[INFO] [stderr]   Downloaded serde-serialize-seed v0.0.9
[INFO] [stderr]   Downloaded nom-errors v0.0.13
[INFO] [stderr]   Downloaded nameof v1.2.2
[INFO] [stderr]   Downloaded utf8-chars v3.0.1
[INFO] [stderr]   Downloaded serde_tagged v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6ef5bae6fd22700739715c408cbee9342980b9393754afbbbf196c01f4730a37
[INFO] running `Command { std: "docker" "start" "-a" "6ef5bae6fd22700739715c408cbee9342980b9393754afbbbf196c01f4730a37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6ef5bae6fd22700739715c408cbee9342980b9393754afbbbf196c01f4730a37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ef5bae6fd22700739715c408cbee9342980b9393754afbbbf196c01f4730a37", kill_on_drop: false }`
[INFO] [stdout] 6ef5bae6fd22700739715c408cbee9342980b9393754afbbbf196c01f4730a37
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d51e7c823cb01ad904cb31779684448f5f63f549b0a226d3e96ffc16ceb5efa2
[INFO] running `Command { std: "docker" "start" "-a" "d51e7c823cb01ad904cb31779684448f5f63f549b0a226d3e96ffc16ceb5efa2", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.75
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling serde v1.0.194
[INFO] [stderr]    Compiling encoding_index_tests v0.1.4
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling crc32fast v1.3.2
[INFO] [stderr]    Compiling paste v1.0.14
[INFO] [stderr]    Compiling memchr v2.7.1
[INFO] [stderr]    Compiling litrs v0.4.1
[INFO] [stderr]    Compiling num-traits v0.2.17
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling num-bigint v0.4.4
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling minimal-lexical v0.2.1
[INFO] [stderr]    Compiling adler v1.0.2
[INFO] [stderr]    Compiling miniz_oxide v0.7.1
[INFO] [stderr]    Compiling document-features v0.2.8
[INFO] [stderr]    Compiling nom v7.1.3
[INFO] [stderr]    Compiling encoding-index-simpchinese v1.20141219.5
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]    Compiling encoding-index-tradchinese v1.20141219.5
[INFO] [stderr]    Compiling encoding-index-korean v1.20141219.5
[INFO] [stderr]    Compiling encoding-index-singlebyte v1.20141219.5
[INFO] [stderr]    Compiling encoding-index-japanese v1.20141219.5
[INFO] [stderr]    Compiling arrayvec v0.7.4
[INFO] [stderr]    Compiling iter-identify_first_last v0.2.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/iter-identify_first_last-0.2.0/src/lib.rs:1:40
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature="nightly", feature(trusted_len))]
[INFO] [stdout]   |                                        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling flate2 v1.0.28
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `iter-identify_first_last` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "d51e7c823cb01ad904cb31779684448f5f63f549b0a226d3e96ffc16ceb5efa2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d51e7c823cb01ad904cb31779684448f5f63f549b0a226d3e96ffc16ceb5efa2", kill_on_drop: false }`
[INFO] [stdout] d51e7c823cb01ad904cb31779684448f5f63f549b0a226d3e96ffc16ceb5efa2
