[INFO] fetching crate ckb-std 0.7.0...
[INFO] testing ckb-std-0.7.0 against 1.47.0 for beta-1.48-1
[INFO] extracting crate ckb-std 0.7.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate ckb-std 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 ckb-std 0.7.0
[INFO] finished tweaking crates.io crate ckb-std 0.7.0
[INFO] tweaked toml for crates.io crate ckb-std 0.7.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate ckb-std 0.7.0 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] 561c4a5ccfa2982992680ed64b3f409427f82d75b71182047e02ca3bcf48715e
[INFO] running `Command { std: "docker" "start" "-a" "561c4a5ccfa2982992680ed64b3f409427f82d75b71182047e02ca3bcf48715e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "561c4a5ccfa2982992680ed64b3f409427f82d75b71182047e02ca3bcf48715e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "561c4a5ccfa2982992680ed64b3f409427f82d75b71182047e02ca3bcf48715e", kill_on_drop: false }`
[INFO] [stdout] 561c4a5ccfa2982992680ed64b3f409427f82d75b71182047e02ca3bcf48715e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] [stdout] 87b8a475d6595bcfc41877207f3160a19f6035576e947ccb92c7a2287202ebae
[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" "87b8a475d6595bcfc41877207f3160a19f6035576e947ccb92c7a2287202ebae", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.0.56
[INFO] [stderr]    Compiling buddy-alloc v0.4.0
[INFO] [stderr]    Compiling molecule v0.6.0
[INFO] [stderr]    Compiling ckb-standalone-types v0.0.1-pre.1
[INFO] [stderr]    Compiling ckb-std 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:12:1
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![feature(llvm_asm)]
[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 `ckb-std`.
[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" "87b8a475d6595bcfc41877207f3160a19f6035576e947ccb92c7a2287202ebae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87b8a475d6595bcfc41877207f3160a19f6035576e947ccb92c7a2287202ebae", kill_on_drop: false }`
[INFO] [stdout] 87b8a475d6595bcfc41877207f3160a19f6035576e947ccb92c7a2287202ebae
