[INFO] updating cached repository nathanfaucett/rs-persistent_list
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/nathanfaucett/rs-persistent_list
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/nathanfaucett/rs-persistent_list" "work/ex/beta-1.38-1/sources/1.37.0/gh/nathanfaucett/rs-persistent_list"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/nathanfaucett/rs-persistent_list'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/nathanfaucett/rs-persistent_list" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/nathanfaucett/rs-persistent_list"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/nathanfaucett/rs-persistent_list'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 672314bda0812a219dcfd35cf7ef8a8b5853cd2e
[INFO] sha for GitHub repo nathanfaucett/rs-persistent_list: 672314bda0812a219dcfd35cf7ef8a8b5853cd2e
[INFO] validating manifest of nathanfaucett/rs-persistent_list 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 nathanfaucett/rs-persistent_list 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 nathanfaucett/rs-persistent_list
[INFO] finished frobbing nathanfaucett/rs-persistent_list
[INFO] frobbed toml for nathanfaucett/rs-persistent_list written to work/ex/beta-1.38-1/sources/1.37.0/gh/nathanfaucett/rs-persistent_list/Cargo.toml
[INFO] started frobbing nathanfaucett/rs-persistent_list
[INFO] finished frobbing nathanfaucett/rs-persistent_list
[INFO] frobbed toml for nathanfaucett/rs-persistent_list written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/nathanfaucett/rs-persistent_list/Cargo.toml
[INFO] crate nathanfaucett/rs-persistent_list 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing nathanfaucett/rs-persistent_list 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-6/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/nathanfaucett/rs-persistent_list:/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] 226cd2e403403c9bf38a5aefc84fa1d0983318bdd12c2b852dd6558336ba529e
[INFO] running `"docker" "start" "-a" "226cd2e403403c9bf38a5aefc84fa1d0983318bdd12c2b852dd6558336ba529e"`
[INFO] [stderr]    Compiling collection_traits v0.1.0 (https://github.com/nathanfaucett/rs-collection_traits#516b19e4)
[INFO] [stderr] error[E0463]: can't find crate for `collections`
[INFO] [stderr]  --> /opt/crater/cargo-home/git/checkouts/rs-collection_traits-dca7cc2c0ed7a0a9/516b19e/src/lib.rs:9:1
[INFO] [stderr]   |
[INFO] [stderr] 9 | extern crate collections;
[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 `collection_traits`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "226cd2e403403c9bf38a5aefc84fa1d0983318bdd12c2b852dd6558336ba529e"`
[INFO] running `"docker" "rm" "-f" "226cd2e403403c9bf38a5aefc84fa1d0983318bdd12c2b852dd6558336ba529e"`
[INFO] [stdout] 226cd2e403403c9bf38a5aefc84fa1d0983318bdd12c2b852dd6558336ba529e