[INFO] cloning repository https://github.com/jackwillis/font-metrics
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jackwillis/font-metrics" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjackwillis%2Ffont-metrics", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjackwillis%2Ffont-metrics'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c24318bffa11feeb118b379eca016471bb5633a5
[INFO] documenting jackwillis/font-metrics 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%2Fjackwillis%2Ffont-metrics" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jackwillis/font-metrics 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/jackwillis/font-metrics
[INFO] finished tweaking git repo https://github.com/jackwillis/font-metrics
[INFO] tweaked toml for git repo https://github.com/jackwillis/font-metrics written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/jackwillis/font-metrics 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-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 83fd286de2dc6e4bc41932565485a06c13a623416657fb25534717ef45fefced
[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" "83fd286de2dc6e4bc41932565485a06c13a623416657fb25534717ef45fefced", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "83fd286de2dc6e4bc41932565485a06c13a623416657fb25534717ef45fefced", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "83fd286de2dc6e4bc41932565485a06c13a623416657fb25534717ef45fefced", kill_on_drop: false }`
[INFO] [stdout] 83fd286de2dc6e4bc41932565485a06c13a623416657fb25534717ef45fefced
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 2e2c96b04cca440e226e485acf2c6721d9d405f9987358c88cf31f5381d16fad
[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" "2e2c96b04cca440e226e485acf2c6721d9d405f9987358c88cf31f5381d16fad", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling num-traits v0.2.4
[INFO] [stderr]     Checking libc v0.2.42
[INFO] [stderr]    Compiling num-integer v0.1.38
[INFO] [stderr]    Compiling cc v1.0.17
[INFO] [stderr]    Compiling serde v1.0.66
[INFO] [stderr]     Checking cfg-if v0.1.3
[INFO] [stderr]     Checking pom v1.1.0
[INFO] [stderr]    Compiling heapsize v0.4.2
[INFO] [stderr]     Checking byteorder v1.2.3
[INFO] [stderr]     Checking linked-hash-map v0.3.0
[INFO] [stderr]     Checking remove_dir_all v0.5.1
[INFO] [stderr]     Checking bitflags v1.0.3
[INFO] [stderr]     Checking postscript v0.11.1
[INFO] [stderr]     Checking unicode-normalization v0.1.7
[INFO] [stderr]     Checking unreachable v0.1.1
[INFO] [stderr]     Checking arrayvec v0.4.7
[INFO] [stderr]     Checking textwrap v0.9.0
[INFO] [stderr]     Checking log v0.4.1
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]     Checking rand v0.4.2
[INFO] [stderr]     Checking time v0.1.40
[INFO] [stderr]     Checking atty v0.2.10
[INFO] [stderr]     Checking stb_truetype v0.2.2
[INFO] [stderr]     Checking type1-encoding-parser v0.1.0
[INFO] [stderr]     Checking adobe-cmap-parser v0.3.2
[INFO] [stderr]     Checking clap v2.31.2
[INFO] [stderr]    Compiling miniz-sys v0.1.10
[INFO] [stderr]     Checking tempdir v0.3.7
[INFO] [stderr]     Checking flate2 v0.2.20
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking approx v0.2.0
[INFO] [stderr]     Checking ordered-float v0.5.0
[INFO] [stderr]     Checking num-iter v0.1.37
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking rusttype v0.6.1
[INFO] [stderr]     Checking chrono v0.3.0
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking lopdf v0.15.1
[INFO] [stderr]     Checking euclid v0.15.6
[INFO] [stderr]     Checking pdf-extract v0.4.3
[INFO] [stderr]     Checking font_metrics v0.0.4 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting font_metrics v0.0.4 (/opt/rustwide/workdir)
[INFO] [stdout] error: expected one of `,`, `.`, `?`, `}`, or an operator, found reserved identifier `_`
[INFO] [stdout]    --> bin/fm-fit.rs:181:13
[INFO] [stdout]     |
[INFO] [stdout] 180 |             "russian" => include_str!("../resources/russian.example.tex")
[INFO] [stdout]     |                       -- while parsing the `match` arm starting here     - expected one of `,`, `.`, `?`, `}`, or an operator
[INFO] [stdout] 181 |             _ => "uh oh",
[INFO] [stdout]     |             ^ unexpected token
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `font_metrics`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name fm_fit bin/fm-fit.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern clap=/opt/rustwide/target/debug/deps/libclap-5dce46e589e283b9.rmeta --extern font_metrics=/opt/rustwide/target/debug/deps/libfont_metrics-28065dacf41aad5e.rmeta --extern lopdf=/opt/rustwide/target/debug/deps/liblopdf-b4aedda141dbf03c.rmeta --extern num_rational=/opt/rustwide/target/debug/deps/libnum_rational-5c38c7ab1b0c5dea.rmeta --extern pdf_extract=/opt/rustwide/target/debug/deps/libpdf_extract-931dddf8cc07ea2d.rmeta --extern rusttype=/opt/rustwide/target/debug/deps/librusttype-d3bd40c07ab7fceb.rmeta --extern tempdir=/opt/rustwide/target/debug/deps/libtempdir-b5290c82ee8e012e.rmeta --cap-lints=warn` (exit code: 1)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "2e2c96b04cca440e226e485acf2c6721d9d405f9987358c88cf31f5381d16fad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2e2c96b04cca440e226e485acf2c6721d9d405f9987358c88cf31f5381d16fad", kill_on_drop: false }`
[INFO] [stdout] 2e2c96b04cca440e226e485acf2c6721d9d405f9987358c88cf31f5381d16fad