[INFO] updating cached repository maartends/vrt2json-rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/maartends/vrt2json-rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/maartends/vrt2json-rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/maartends/vrt2json-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/maartends/vrt2json-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/maartends/vrt2json-rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/maartends/vrt2json-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/maartends/vrt2json-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9a09b8600917dd2ab62c8a574a9a5b50ba740d83
[INFO] sha for GitHub repo maartends/vrt2json-rust: 9a09b8600917dd2ab62c8a574a9a5b50ba740d83
[INFO] validating manifest of maartends/vrt2json-rust on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of maartends/vrt2json-rust on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing maartends/vrt2json-rust
[INFO] finished frobbing maartends/vrt2json-rust
[INFO] frobbed toml for maartends/vrt2json-rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/maartends/vrt2json-rust/Cargo.toml
[INFO] started frobbing maartends/vrt2json-rust
[INFO] finished frobbing maartends/vrt2json-rust
[INFO] frobbed toml for maartends/vrt2json-rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/maartends/vrt2json-rust/Cargo.toml
[INFO] crate maartends/vrt2json-rust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing maartends/vrt2json-rust against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/maartends/vrt2json-rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] ded4d571e283b8c3db1e71643fe7e456876c119fd1ba89f704d1013d5a349f3f
[INFO] running `"docker" "start" "-a" "ded4d571e283b8c3db1e71643fe7e456876c119fd1ba89f704d1013d5a349f3f"`
[INFO] [stderr]    Compiling xmlJSON v0.2.0
[INFO] [stderr]    Compiling vrt2json-rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0463]: can't find crate for `rustc_serialize`
[INFO] [stderr]  --> src/main.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | extern crate rustc_serialize;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0463`.
[INFO] [stderr] error: Could not compile `vrt2json-rust`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "ded4d571e283b8c3db1e71643fe7e456876c119fd1ba89f704d1013d5a349f3f"`
[INFO] running `"docker" "rm" "-f" "ded4d571e283b8c3db1e71643fe7e456876c119fd1ba89f704d1013d5a349f3f"`
[INFO] [stdout] ded4d571e283b8c3db1e71643fe7e456876c119fd1ba89f704d1013d5a349f3f