[INFO] updating cached repository https://github.com/rust-lang-nursery/mdBook
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/rust-lang-nursery/mdBook
[INFO] [stderr]    a873d46..b4bb442  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b4bb44292d707c720dc75851500b3249d3a93ad3
[INFO] checking rust-lang-nursery/mdBook against master#fe6d05a8b32f5c66c427ca524dbcce5a7145f87e for pr-64327
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Frust-lang-nursery%2FmdBook" "work/builds/worker-5/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rust-lang-nursery/mdBook on toolchain fe6d05a8b32f5c66c427ca524dbcce5a7145f87e-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+fe6d05a8b32f5c66c427ca524dbcce5a7145f87e-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/rust-lang-nursery/mdBook
[INFO] finished tweaking git repo https://github.com/rust-lang-nursery/mdBook
[INFO] tweaked toml for git repo https://github.com/rust-lang-nursery/mdBook written to work/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/rust-lang-nursery/mdBook already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+fe6d05a8b32f5c66c427ca524dbcce5a7145f87e-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-5/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+fe6d05a8b32f5c66c427ca524dbcce5a7145f87e-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 44bb7afb718b36c36ed0c59b06a967124b9c983fba799465038d1e5210b0bcf6
[INFO] running `"docker" "start" "-a" "44bb7afb718b36c36ed0c59b06a967124b9c983fba799465038d1e5210b0bcf6"`
[INFO] [stderr]    Compiling pulldown-cmark v0.5.3
[INFO] [stderr]     Checking is-match v0.1.0
[INFO] [stderr]     Checking open v1.3.2
[INFO] [stderr]     Checking hashbrown v0.5.0
[INFO] [stderr]    Compiling darling_core v0.8.6
[INFO] [stderr]    Compiling html5ever v0.24.0
[INFO] [stderr]    Compiling html5ever v0.23.0
[INFO] [stderr]    Compiling pest_generator v2.1.1
[INFO] [stderr]    Compiling strum_macros v0.15.0
[INFO] [stderr]    Compiling string_cache_codegen v0.4.4
[INFO] [stderr]     Checking ws v0.9.0
[INFO] [stderr]     Checking staticfile v0.5.0
[INFO] [stderr]    Compiling string_cache v0.7.3
[INFO] [stderr]    Compiling markup5ever v0.9.0
[INFO] [stderr]    Compiling markup5ever v0.8.1
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]     Checking elasticlunr-rs v2.3.6
[INFO] [stderr]     Checking handlebars v2.0.2
[INFO] [stderr]    Compiling darling_macro v0.8.6
[INFO] [stderr]    Compiling darling v0.8.6
[INFO] [stderr]    Compiling toml-query_derive v0.9.0
[INFO] [stderr]     Checking select v0.4.3
[INFO] [stderr]     Checking ammonia v3.0.0
[INFO] [stderr]     Checking toml-query v0.9.2
[INFO] [stderr]     Checking mdbook v0.3.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2m 08s
[INFO] running `"docker" "inspect" "44bb7afb718b36c36ed0c59b06a967124b9c983fba799465038d1e5210b0bcf6"`
[INFO] running `"docker" "rm" "-f" "44bb7afb718b36c36ed0c59b06a967124b9c983fba799465038d1e5210b0bcf6"`
[INFO] [stdout] 44bb7afb718b36c36ed0c59b06a967124b9c983fba799465038d1e5210b0bcf6