[INFO] cloning repository https://github.com/VukoDrakkeinen/magnatar
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/VukoDrakkeinen/magnatar" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FVukoDrakkeinen%2Fmagnatar", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FVukoDrakkeinen%2Fmagnatar'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6d009d57449f575e204c109b43a83adaaa45fdd8
[INFO] documenting VukoDrakkeinen/magnatar against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FVukoDrakkeinen%2Fmagnatar" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/VukoDrakkeinen/magnatar on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/VukoDrakkeinen/magnatar
[INFO] finished tweaking git repo https://github.com/VukoDrakkeinen/magnatar
[INFO] tweaked toml for git repo https://github.com/VukoDrakkeinen/magnatar written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/VukoDrakkeinen/magnatar already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] error: the lock file /workspace/builds/worker-2/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde_codegen_internals v0.4.0
[INFO] [stderr]   Downloaded quasi_codegen v0.16.0
[INFO] [stderr]   Downloaded serde_codegen v0.7.15
[INFO] [stderr]   Downloaded quasi v0.16.0
[INFO] [stderr]   Downloaded aster v0.22.1
[INFO] [stderr]   Downloaded syntex v0.39.0
[INFO] [stderr]   Downloaded syntex_errors v0.39.0
[INFO] [stderr]   Downloaded syntex_pos v0.39.0
[INFO] [stderr]   Downloaded bip_bencode v0.1.3
[INFO] [stderr]   Downloaded syntex_syntax v0.39.0
[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" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 89db26e26bddcd4a55d76b41635176dce1f8fbb9ecb94e57580a971749dd817e
[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" "89db26e26bddcd4a55d76b41635176dce1f8fbb9ecb94e57580a971749dd817e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "89db26e26bddcd4a55d76b41635176dce1f8fbb9ecb94e57580a971749dd817e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "89db26e26bddcd4a55d76b41635176dce1f8fbb9ecb94e57580a971749dd817e", kill_on_drop: false }`
[INFO] [stdout] 89db26e26bddcd4a55d76b41635176dce1f8fbb9ecb94e57580a971749dd817e
[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" "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" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e90d2f7c9e31bc1a83b4f08b8b77830758d699dfa6cd9f8841ec4cdaaa8c9326
[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" "e90d2f7c9e31bc1a83b4f08b8b77830758d699dfa6cd9f8841ec4cdaaa8c9326", kill_on_drop: false }`
[INFO] [stderr]    Compiling bitflags v0.5.0
[INFO] [stderr]     Checking serde v0.7.15
[INFO] [stderr]     Checking bip_bencode v0.1.3
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling syntex_pos v0.39.0
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling syntex_errors v0.39.0
[INFO] [stderr]    Compiling syntex_syntax v0.39.0
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking serde_json v0.7.4
[INFO] [stdout] error[E0502]: cannot borrow `cx.parse_sess.span_diagnostic` as immutable because it is also borrowed as mutable
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/syntex_syntax-0.39.0/src/ext/expand.rs:659:25
[INFO] [stdout]     |
[INFO] [stdout] 649 |         let mut expander = MacroExpander::new(&mut cx);
[INFO] [stdout]     |                                               ------- mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 659 |         let err_count = cx.parse_sess.span_diagnostic.err_count();
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ immutable borrow occurs here
[INFO] [stdout] 660 |         let mut ret = expander.fold_crate(c);
[INFO] [stdout]     |                       -------- mutable borrow later used here
[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 E0502`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `syntex_syntax`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "e90d2f7c9e31bc1a83b4f08b8b77830758d699dfa6cd9f8841ec4cdaaa8c9326", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e90d2f7c9e31bc1a83b4f08b8b77830758d699dfa6cd9f8841ec4cdaaa8c9326", kill_on_drop: false }`
[INFO] [stdout] e90d2f7c9e31bc1a83b4f08b8b77830758d699dfa6cd9f8841ec4cdaaa8c9326