[INFO] fetching crate wamp 0.1.0...
[INFO] documenting wamp-0.1.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate wamp 0.1.0 into /workspace/builds/worker-11/source
[INFO] validating manifest of crates.io crate wamp 0.1.0 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 crates.io crate wamp 0.1.0
[INFO] removed path dependency rmp from crates.io crate wamp 0.1.0
[INFO] removed path dependency rmp-serde from crates.io crate wamp 0.1.0
[INFO] finished tweaking crates.io crate wamp 0.1.0
[INFO] tweaked toml for crates.io crate wamp 0.1.0 written to /workspace/builds/worker-11/source/Cargo.toml
[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]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded syntex_errors v0.39.0
[INFO] [stderr]   Downloaded syntex_pos v0.39.0
[INFO] [stderr]   Downloaded ws v0.5.3
[INFO] [stderr]   Downloaded syntex v0.39.0
[INFO] [stderr]   Downloaded rmp v0.7.5
[INFO] [stderr]   Downloaded syntex_syntax v0.39.0
[INFO] [stderr]   Downloaded rmp-serde v0.9.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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] a5eea4a169aa425f6e585ee82b8bcbdd24de1f9f5f66990d42e7d0f33108d54b
[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" "a5eea4a169aa425f6e585ee82b8bcbdd24de1f9f5f66990d42e7d0f33108d54b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a5eea4a169aa425f6e585ee82b8bcbdd24de1f9f5f66990d42e7d0f33108d54b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a5eea4a169aa425f6e585ee82b8bcbdd24de1f9f5f66990d42e7d0f33108d54b", kill_on_drop: false }`
[INFO] [stdout] a5eea4a169aa425f6e585ee82b8bcbdd24de1f9f5f66990d42e7d0f33108d54b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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] 8bcf3e4f10195460d3bace72b414631474591ac1755befe44b55daae105be47f
[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" "8bcf3e4f10195460d3bace72b414631474591ac1755befe44b55daae105be47f", kill_on_drop: false }`
[INFO] [stderr]     Checking byteorder v0.4.2
[INFO] [stderr]     Checking sha1 v0.2.0
[INFO] [stderr]    Compiling syntex_pos v0.39.0
[INFO] [stderr]     Checking syncbox v0.2.4
[INFO] [stderr]     Checking env_logger v0.3.5
[INFO] [stderr]     Checking ws v0.5.3
[INFO] [stderr]     Checking rmp v0.7.5
[INFO] [stderr]    Compiling syntex_errors v0.39.0
[INFO] [stderr]     Checking eventual v0.1.7
[INFO] [stderr]     Checking rmp-serde v0.9.6
[INFO] [stderr]    Compiling syntex_syntax v0.39.0
[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" "8bcf3e4f10195460d3bace72b414631474591ac1755befe44b55daae105be47f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8bcf3e4f10195460d3bace72b414631474591ac1755befe44b55daae105be47f", kill_on_drop: false }`
[INFO] [stdout] 8bcf3e4f10195460d3bace72b414631474591ac1755befe44b55daae105be47f