[INFO] fetching crate esl 0.7.0...
[INFO] testing esl-0.7.0 against 1.47.0 for beta-1.48-1
[INFO] extracting crate esl 0.7.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate esl 0.7.0 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate esl 0.7.0
[INFO] finished tweaking crates.io crate esl 0.7.0
[INFO] tweaked toml for crates.io crate esl 0.7.0 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7a63819be6e05b3b088804a0c3926a1f69054a2ef0466cdedee679cba9ecf986
[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" "7a63819be6e05b3b088804a0c3926a1f69054a2ef0466cdedee679cba9ecf986", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7a63819be6e05b3b088804a0c3926a1f69054a2ef0466cdedee679cba9ecf986", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7a63819be6e05b3b088804a0c3926a1f69054a2ef0466cdedee679cba9ecf986", kill_on_drop: false }`
[INFO] [stdout] 7a63819be6e05b3b088804a0c3926a1f69054a2ef0466cdedee679cba9ecf986
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "build" "--frozen" "--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] cc3c77f6a38b8860afd127c93a4d9ed0d3ec0403474934c4272ac03ddb10384a
[INFO] running `Command { std: "docker" "start" "-a" "cc3c77f6a38b8860afd127c93a4d9ed0d3ec0403474934c4272ac03ddb10384a", kill_on_drop: false }`
[INFO] [stderr]    Compiling lexical-core v0.7.4
[INFO] [stderr]    Compiling arrayvec v0.5.1
[INFO] [stderr]    Compiling enum-derive-2018 v1.0.1
[INFO] [stderr]    Compiling macro-attr-2018 v1.1.0
[INFO] [stderr]    Compiling nameof v1.2.1
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling num-bigint v0.3.0
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]    Compiling syn v1.0.44
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]    Compiling enum-ordinalize v3.1.8
[INFO] [stderr]    Compiling enum-primitive-derive v0.2.1
[INFO] [stderr]    Compiling educe v0.4.13
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling esl v0.7.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(type_alias_impl_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(stmt_expr_attributes)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `esl`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "cc3c77f6a38b8860afd127c93a4d9ed0d3ec0403474934c4272ac03ddb10384a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cc3c77f6a38b8860afd127c93a4d9ed0d3ec0403474934c4272ac03ddb10384a", kill_on_drop: false }`
[INFO] [stdout] cc3c77f6a38b8860afd127c93a4d9ed0d3ec0403474934c4272ac03ddb10384a
