[INFO] fetching crate one2html 1.0.0...
[INFO] testing one2html-1.0.0 against 1.49.0 for beta-1.50-1
[INFO] extracting crate one2html 1.0.0 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate one2html 1.0.0 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate one2html 1.0.0
[INFO] finished tweaking crates.io crate one2html 1.0.0
[INFO] tweaked toml for crates.io crate one2html 1.0.0 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate crates.io crate one2html 1.0.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", 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] af0fbf1e753af413c241124d7a1909e74648b6bc8377660f2657299646dfe94a
[INFO] running `Command { std: "docker" "start" "-a" "af0fbf1e753af413c241124d7a1909e74648b6bc8377660f2657299646dfe94a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "af0fbf1e753af413c241124d7a1909e74648b6bc8377660f2657299646dfe94a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af0fbf1e753af413c241124d7a1909e74648b6bc8377660f2657299646dfe94a", kill_on_drop: false }`
[INFO] [stdout] af0fbf1e753af413c241124d7a1909e74648b6bc8377660f2657299646dfe94a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "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] 541e5664131eecf455cd3732304fcdf086dc619296756a551200eadda7c7a87c
[INFO] running `Command { std: "docker" "start" "-a" "541e5664131eecf455cd3732304fcdf086dc619296756a551200eadda7c7a87c", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.48
[INFO] [stderr]    Compiling getrandom v0.1.15
[INFO] [stderr]    Compiling siphasher v0.3.3
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]    Compiling askama_escape v0.10.1
[INFO] [stderr]    Compiling humansize v1.1.0
[INFO] [stderr]    Compiling eyre v0.6.2
[INFO] [stderr]    Compiling once_cell v1.4.1
[INFO] [stderr]    Compiling indenter v0.3.0
[INFO] [stderr]    Compiling owo-colors v1.1.3
[INFO] [stderr]    Compiling uuid v0.8.1
[INFO] [stderr]    Compiling paste v1.0.2
[INFO] [stderr]    Compiling widestring v0.4.3
[INFO] [stderr]    Compiling tracing-core v0.1.17
[INFO] [stderr]    Compiling sharded-slab v0.1.0
[INFO] [stderr]    Compiling addr2line v0.14.0
[INFO] [stderr]    Compiling phf_shared v0.8.0
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling terminal_size v0.1.13
[INFO] [stderr]    Compiling approx v0.3.2
[INFO] [stderr]    Compiling sanitize-filename v0.3.0
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling console v0.13.0
[INFO] [stderr]    Compiling phf v0.8.0
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling backtrace v0.3.54
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand_pcg v0.2.1
[INFO] [stderr]    Compiling indicatif v0.15.0
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling tracing-subscriber v0.2.15
[INFO] [stderr]    Compiling phf_generator v0.8.0
[INFO] [stderr]    Compiling phf_codegen v0.8.0
[INFO] [stderr]    Compiling palette v0.5.0
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling tracing-attributes v0.1.11
[INFO] [stderr]    Compiling thiserror-impl v1.0.22
[INFO] [stderr]    Compiling structopt-derive v0.4.13
[INFO] [stderr]    Compiling enum-primitive-derive v0.2.1
[INFO] [stderr]    Compiling palette_derive v0.5.0
[INFO] [stderr]    Compiling thiserror v1.0.22
[INFO] [stderr]    Compiling onenote_parser v0.2.1
[INFO] [stderr]    Compiling tracing v0.1.21
[INFO] [stderr]    Compiling structopt v0.3.20
[INFO] [stderr]    Compiling tracing-error v0.1.2
[INFO] [stderr]    Compiling happylog v0.1.0
[INFO] [stderr]    Compiling color-spantrace v0.1.4
[INFO] [stderr]    Compiling color-eyre v0.5.7
[INFO] [stderr]    Compiling toml v0.5.7
[INFO] [stderr]    Compiling askama_shared v0.10.4
[INFO] [stderr]    Compiling askama_derive v0.10.3
[INFO] [stderr]    Compiling askama v0.10.3
[INFO] [stderr]    Compiling one2html v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:36
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature = "backtrace", feature(backtrace))]
[INFO] [stdout]   |                                    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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 `one2html`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "541e5664131eecf455cd3732304fcdf086dc619296756a551200eadda7c7a87c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "541e5664131eecf455cd3732304fcdf086dc619296756a551200eadda7c7a87c", kill_on_drop: false }`
[INFO] [stdout] 541e5664131eecf455cd3732304fcdf086dc619296756a551200eadda7c7a87c