[INFO] fetching crate holochain_metrics 0.0.52-alpha2...
[INFO] checking holochain_metrics-0.0.52-alpha2 against try#8b72f65b805cbe4c261de45030d663f524f27376 for pr-78991
[INFO] extracting crate holochain_metrics 0.0.52-alpha2 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate holochain_metrics 0.0.52-alpha2 on toolchain 8b72f65b805cbe4c261de45030d663f524f27376
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8b72f65b805cbe4c261de45030d663f524f27376" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate holochain_metrics 0.0.52-alpha2
[INFO] finished tweaking crates.io crate holochain_metrics 0.0.52-alpha2
[INFO] tweaked toml for crates.io crate holochain_metrics 0.0.52-alpha2 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate holochain_metrics 0.0.52-alpha2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8b72f65b805cbe4c261de45030d663f524f27376" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+8b72f65b805cbe4c261de45030d663f524f27376" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f419364f87b5ebdd9152b79883b94263c2334bc2c5615b6470743e9cba9f61f2
[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" "f419364f87b5ebdd9152b79883b94263c2334bc2c5615b6470743e9cba9f61f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f419364f87b5ebdd9152b79883b94263c2334bc2c5615b6470743e9cba9f61f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f419364f87b5ebdd9152b79883b94263c2334bc2c5615b6470743e9cba9f61f2", kill_on_drop: false }`
[INFO] [stdout] f419364f87b5ebdd9152b79883b94263c2334bc2c5615b6470743e9cba9f61f2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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=forbid" "-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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+8b72f65b805cbe4c261de45030d663f524f27376" "check" "--frozen" "--all" "--all-targets" "--message-format=json", 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] 25ced22f68ca87529ed47b59e8c0e2537a6b2e36683269f6b2be01e24cd5218d
[INFO] running `Command { std: "docker" "start" "-a" "25ced22f68ca87529ed47b59e8c0e2537a6b2e36683269f6b2be01e24cd5218d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling syn v1.0.42
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling num-traits v0.2.6
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling protobuf v2.14.0
[INFO] [stderr]    Compiling ppv-lite86 v0.2.9
[INFO] [stderr]     Checking foreign-types-shared v0.1.1
[INFO] [stderr]    Compiling pin-project-internal v0.4.25
[INFO] [stderr]    Compiling openssl v0.10.30
[INFO] [stderr]    Compiling prometheus v0.7.0
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling spin v0.5.2
[INFO] [stderr]     Checking arrayref v0.3.6
[INFO] [stderr]    Compiling rustc-demangle v0.1.16
[INFO] [stderr]     Checking constant_time_eq v0.1.5
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling integer-encoding v1.1.5
[INFO] [stderr]    Compiling utf8-ranges v1.0.4
[INFO] [stderr]     Checking safemem v0.3.3
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking hex v0.3.2
[INFO] [stderr]    Compiling unicode-segmentation v1.6.0
[INFO] [stderr]    Compiling smallvec v1.4.2
[INFO] [stderr]    Compiling num-derive v0.2.4
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking utf8parse v0.1.1
[INFO] [stderr]     Checking snowflake v1.3.0
[INFO] [stderr]     Checking termcolor v1.1.0
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling backtrace v0.3.27
[INFO] [stderr]     Checking colored v1.7.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.37
[INFO] [stderr]     Checking tokio-sync v0.1.8
[INFO] [stderr]    Compiling openssl-sys v0.9.58
[INFO] [stderr]    Compiling tracing-core v0.1.10
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling sharded-slab v0.0.8
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]     Checking foreign-types v0.3.2
[INFO] [stderr]     Checking block-buffer v0.3.3
[INFO] [stderr]    Compiling itertools v0.8.2
[INFO] [stderr]    Compiling itertools v0.7.11
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]     Checking vte v0.3.3
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]     Checking bitflags v1.2.1
[INFO] [stderr]     Checking idna v0.1.5
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]     Checking crossbeam-queue v0.1.2
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking net2 v0.2.35
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking signal-hook-registry v1.2.1
[INFO] [stderr]     Checking dirs v1.0.5
[INFO] [stderr]     Checking getrandom v0.1.15
[INFO] [stderr]     Checking directories v1.0.2
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling hostname v0.1.5
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]     Checking base64 v0.9.3
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]     Checking aho-corasick v0.6.10
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]    Compiling syn v0.12.15
[INFO] [stderr]     Checking xml-rs v0.7.0
[INFO] [stderr]     Checking strip-ansi-escapes v0.1.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling smallvec v0.6.13
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking futures-cpupool v0.1.8
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]    Compiling threadpool v1.8.1
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking holochain_common v0.0.52-alpha2
[INFO] [stderr]     Checking url v1.7.2
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/syn-0.12.15/src/parsers.rs:68:48
[INFO] [stdout]      |
[INFO] [stdout] 68   |           fn $name(i: $crate::buffer::Cursor) -> $crate::synom::PResult<$o> {
[INFO] [stdout]      |                                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^ expected enum `std::result::Result`, found `()`
[INFO] [stdout] 69   |               $submac!(i, $($args)*)
[INFO] [stdout]      |                                    - help: consider removing this semicolon
[INFO] [stdout]      | 
[INFO] [stdout]     ::: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/syn-0.12.15/src/expr.rs:1692:12
[INFO] [stdout]      |
[INFO] [stdout] 1692 |       named!(and_call -> (token::Paren, Punctuated<Expr, Token![,]>),
[INFO] [stdout]      |       -      -------- implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout]      |  _____|
[INFO] [stdout]      | |
[INFO] [stdout] 1693 | |            parens!(Punctuated::parse_terminated));
[INFO] [stdout]      | |__________________________________________________- in this macro invocation
[INFO] [stdout]      |
[INFO] [stdout]      = note:   expected enum `std::result::Result<((Paren, punctuated::Punctuated<expr::Expr, Comma>), buffer::Cursor<'_>), error::ParseError>`
[INFO] [stdout]              found unit type `()`
[INFO] [stdout]      = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking crypto-mac v0.5.2
[INFO] [stderr]     Checking regex v1.1.2
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]    Compiling ordered-float v1.1.0
[INFO] [stderr]    Compiling crossbeam-channel v0.3.8
[INFO] [stderr]     Checking streaming-stats v0.2.2
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `syn`
[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" "25ced22f68ca87529ed47b59e8c0e2537a6b2e36683269f6b2be01e24cd5218d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "25ced22f68ca87529ed47b59e8c0e2537a6b2e36683269f6b2be01e24cd5218d", kill_on_drop: false }`
[INFO] [stdout] 25ced22f68ca87529ed47b59e8c0e2537a6b2e36683269f6b2be01e24cd5218d