[INFO] cloning repository https://github.com/mmaker/anonymous-tokens
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mmaker/anonymous-tokens" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmmaker%2Fanonymous-tokens", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmmaker%2Fanonymous-tokens'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fd323a67d26cee02652e0cc5efd3580f6a87febb
[INFO] documenting mmaker/anonymous-tokens against 1.46.0 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmmaker%2Fanonymous-tokens" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mmaker/anonymous-tokens on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mmaker/anonymous-tokens
[INFO] finished tweaking git repo https://github.com/mmaker/anonymous-tokens
[INFO] tweaked toml for git repo https://github.com/mmaker/anonymous-tokens written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/mmaker/anonymous-tokens already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 845d40efdc97db10d45dde45a0242576e49bf12c79c5a728eff089553faa102d
[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" "845d40efdc97db10d45dde45a0242576e49bf12c79c5a728eff089553faa102d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "845d40efdc97db10d45dde45a0242576e49bf12c79c5a728eff089553faa102d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "845d40efdc97db10d45dde45a0242576e49bf12c79c5a728eff089553faa102d", kill_on_drop: false }`
[INFO] [stdout] 845d40efdc97db10d45dde45a0242576e49bf12c79c5a728eff089553faa102d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fa29146b5dc9d78284f0d1275d62c10c1dd25d1cb96f7380bf3ef6a9b91891a0
[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" "fa29146b5dc9d78284f0d1275d62c10c1dd25d1cb96f7380bf3ef6a9b91891a0", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.31
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling serde v1.0.112
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]     Checking keccak v0.1.0
[INFO] [stderr]     Checking subtle v2.2.3
[INFO] [stderr]     Checking addr2line v0.12.1
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking generic-array v0.12.3
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking digest v0.8.1
[INFO] [stderr]     Checking backtrace v0.3.49
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking sha2 v0.8.2
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]    Compiling zeroize_derive v1.0.0
[INFO] [stderr]    Compiling serde_derive v1.0.112
[INFO] [stderr]    Compiling thiserror-impl v1.0.19
[INFO] [stderr]     Checking zeroize v1.1.0
[INFO] [stderr]     Checking merlin v2.0.0
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking thiserror v1.0.19
[INFO] [stderr]     Checking curve25519-dalek v2.1.0
[INFO] [stderr]     Checking bincode v1.2.1
[INFO] [stderr]     Checking zkp v0.7.0
[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/zkp-0.7.0/src/lib.rs:13:32
[INFO] [stdout]    |
[INFO] [stdout] 13 | #![cfg_attr(feature = "bench", feature(test))]
[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 `zkp`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "fa29146b5dc9d78284f0d1275d62c10c1dd25d1cb96f7380bf3ef6a9b91891a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa29146b5dc9d78284f0d1275d62c10c1dd25d1cb96f7380bf3ef6a9b91891a0", kill_on_drop: false }`
[INFO] [stdout] fa29146b5dc9d78284f0d1275d62c10c1dd25d1cb96f7380bf3ef6a9b91891a0