[INFO] fetching crate tuifw-window 0.8.1...
[INFO] documenting tuifw-window-0.8.1 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate tuifw-window 0.8.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate tuifw-window 0.8.1 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 tuifw-window 0.8.1
[INFO] finished tweaking crates.io crate tuifw-window 0.8.1
[INFO] tweaked toml for crates.io crate tuifw-window 0.8.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate tuifw-window 0.8.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded paste v1.0.1
[INFO] [stderr]   Downloaded tuifw-screen-winapi v0.8.1
[INFO] [stderr]   Downloaded macro-attr-2018 v1.1.0
[INFO] [stderr]   Downloaded educe v0.4.13
[INFO] [stderr]   Downloaded phantom-type v0.3.0
[INFO] [stderr]   Downloaded enum-ordinalize v3.1.8
[INFO] [stderr]   Downloaded components-arena v1.1.1
[INFO] [stderr]   Downloaded num-bigint v0.3.0
[INFO] [stderr]   Downloaded tuifw-screen-test v0.8.1
[INFO] [stderr]   Downloaded enum-derive-2018 v1.0.1
[INFO] [stderr]   Downloaded tuifw-screen-base v0.8.1
[INFO] [stderr]   Downloaded dyn-context v0.3.2
[INFO] [stderr]   Downloaded generics v0.2.5
[INFO] [stderr]   Downloaded tuifw-screen v0.8.1
[INFO] [stderr]   Downloaded tuifw-screen-ncurses v0.8.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] aac3e2c781db3c01bd74fa57aeed448257c28c650b48181261a0b69ed3c5bf55
[INFO] running `Command { std: "docker" "start" "-a" "aac3e2c781db3c01bd74fa57aeed448257c28c650b48181261a0b69ed3c5bf55", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aac3e2c781db3c01bd74fa57aeed448257c28c650b48181261a0b69ed3c5bf55", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aac3e2c781db3c01bd74fa57aeed448257c28c650b48181261a0b69ed3c5bf55", kill_on_drop: false }`
[INFO] [stdout] aac3e2c781db3c01bd74fa57aeed448257c28c650b48181261a0b69ed3c5bf55
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9e0cc332b9083bf65b5a1e59b2662cd20b1ce4e6b6a95aee3db8fa72c755dc83
[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" "9e0cc332b9083bf65b5a1e59b2662cd20b1ce4e6b6a95aee3db8fa72c755dc83", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.23
[INFO] [stderr]    Compiling syn v1.0.42
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking ppv-lite86 v0.2.9
[INFO] [stderr]     Checking generics v0.2.5
[INFO] [stderr]     Checking enum-derive-2018 v1.0.1
[INFO] [stderr]     Checking macro-attr-2018 v1.1.0
[INFO] [stderr]    Compiling paste v1.0.1
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-bigint v0.3.0
[INFO] [stderr]     Checking rand_pcg v0.2.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking dyn-context v0.3.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/dyn-context-0.3.2/src/lib.rs:1:32
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature="nightly", feature(never_type))]
[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 `dyn-context`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "9e0cc332b9083bf65b5a1e59b2662cd20b1ce4e6b6a95aee3db8fa72c755dc83", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9e0cc332b9083bf65b5a1e59b2662cd20b1ce4e6b6a95aee3db8fa72c755dc83", kill_on_drop: false }`
[INFO] [stdout] 9e0cc332b9083bf65b5a1e59b2662cd20b1ce4e6b6a95aee3db8fa72c755dc83
