[INFO] updating cached repository archer884/rbench
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/archer884/rbench
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/archer884/rbench" "work/ex/beta-1.38-1/sources/1.37.0/gh/archer884/rbench"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/archer884/rbench'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/archer884/rbench" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/archer884/rbench"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/archer884/rbench'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1e263b9bd6e15560e7a6f4ceb50150a84589f94e
[INFO] sha for GitHub repo archer884/rbench: 1e263b9bd6e15560e7a6f4ceb50150a84589f94e
[INFO] validating manifest of archer884/rbench 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 archer884/rbench 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 archer884/rbench
[INFO] finished frobbing archer884/rbench
[INFO] frobbed toml for archer884/rbench written to work/ex/beta-1.38-1/sources/1.37.0/gh/archer884/rbench/Cargo.toml
[INFO] started frobbing archer884/rbench
[INFO] finished frobbing archer884/rbench
[INFO] frobbed toml for archer884/rbench written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/archer884/rbench/Cargo.toml
[INFO] crate archer884/rbench 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] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/archer884/rbench/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 archer884/rbench 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-7/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/archer884/rbench:/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] 58c5d80f876db1c5dbf092c393d8c1b598ee2bd5ea505c2538337783571b9e93
[INFO] running `"docker" "start" "-a" "58c5d80f876db1c5dbf092c393d8c1b598ee2bd5ea505c2538337783571b9e93"`
[INFO] [stderr]    Compiling rbench v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved import `std::thread::scoped`
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::thread::scoped;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^ no `scoped` in `thread`
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `serde::json`
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use serde::json;
[INFO] [stderr]   |     ^^^^^^^^^^^ no `json` in the root
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `serde::json`
[INFO] [stderr]  --> src/main.rs:5:12
[INFO] [stderr]   |
[INFO] [stderr] 5 | use serde::json::Value;
[INFO] [stderr]   |            ^^^^ could not find `json` in `serde`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `rbench`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "58c5d80f876db1c5dbf092c393d8c1b598ee2bd5ea505c2538337783571b9e93"`
[INFO] running `"docker" "rm" "-f" "58c5d80f876db1c5dbf092c393d8c1b598ee2bd5ea505c2538337783571b9e93"`
[INFO] [stdout] 58c5d80f876db1c5dbf092c393d8c1b598ee2bd5ea505c2538337783571b9e93