[INFO] cloning repository https://github.com/Joshua-Wright/hardlink-deduplicator
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Joshua-Wright/hardlink-deduplicator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJoshua-Wright%2Fhardlink-deduplicator", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJoshua-Wright%2Fhardlink-deduplicator'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] da207b3f7c6dc3b027f1aee3b022db061bd8454a
[INFO] documenting Joshua-Wright/hardlink-deduplicator 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%2FJoshua-Wright%2Fhardlink-deduplicator" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Joshua-Wright/hardlink-deduplicator 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/Joshua-Wright/hardlink-deduplicator
[INFO] finished tweaking git repo https://github.com/Joshua-Wright/hardlink-deduplicator
[INFO] tweaked toml for git repo https://github.com/Joshua-Wright/hardlink-deduplicator written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/Joshua-Wright/hardlink-deduplicator 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] 7e833efdd3cfc9e2a43b38f7e87d334975cc6b5b8cbe85bcf399efff0b0d6fab
[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" "7e833efdd3cfc9e2a43b38f7e87d334975cc6b5b8cbe85bcf399efff0b0d6fab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7e833efdd3cfc9e2a43b38f7e87d334975cc6b5b8cbe85bcf399efff0b0d6fab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7e833efdd3cfc9e2a43b38f7e87d334975cc6b5b8cbe85bcf399efff0b0d6fab", kill_on_drop: false }`
[INFO] [stdout] 7e833efdd3cfc9e2a43b38f7e87d334975cc6b5b8cbe85bcf399efff0b0d6fab
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] 48defaa6659285ed86ab1bc888d89ab85412a74e6bb2f52c0fa91042d6b92e85
[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" "48defaa6659285ed86ab1bc888d89ab85412a74e6bb2f52c0fa91042d6b92e85", kill_on_drop: false }`
[INFO] [stderr]    Compiling fasthash-sys v0.3.2 (https://github.com/Joshua-Wright/rust-fasthash/?rev=bd0ef9b9391ca80d1a115c3207e1f8417bb4c6b9#bd0ef9b9)
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]     Checking float-cmp v0.6.0
[INFO] [stderr]    Compiling mockall_derive v0.7.1
[INFO] [stderr]     Checking xoroshiro128 v0.3.0
[INFO] [stderr]     Checking bstr v0.2.13
[INFO] [stderr]     Checking humantime-serde v1.0.0
[INFO] [stderr]     Checking predicates v1.0.4
[INFO] [stderr]    Compiling proc-macro-error-attr v0.4.12
[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/mockall_derive-0.7.1/src/lib.rs:8:41
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![cfg_attr(feature = "nightly_derive", feature(proc_macro_diagnostic))]
[INFO] [stdout]   |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking csv v1.1.3
[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 `mockall_derive`.
[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" "48defaa6659285ed86ab1bc888d89ab85412a74e6bb2f52c0fa91042d6b92e85", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "48defaa6659285ed86ab1bc888d89ab85412a74e6bb2f52c0fa91042d6b92e85", kill_on_drop: false }`
[INFO] [stdout] 48defaa6659285ed86ab1bc888d89ab85412a74e6bb2f52c0fa91042d6b92e85