[INFO] updating cached repository mmun/redis-nickel-server
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mmun/redis-nickel-server
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mmun/redis-nickel-server" "work/ex/beta-1.38-1/sources/1.37.0/gh/mmun/redis-nickel-server"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/mmun/redis-nickel-server'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mmun/redis-nickel-server" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mmun/redis-nickel-server"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mmun/redis-nickel-server'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 972135c421808c41a01fc02b23cf647f786d24f3
[INFO] sha for GitHub repo mmun/redis-nickel-server: 972135c421808c41a01fc02b23cf647f786d24f3
[INFO] validating manifest of mmun/redis-nickel-server 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 mmun/redis-nickel-server 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 mmun/redis-nickel-server
[INFO] finished frobbing mmun/redis-nickel-server
[INFO] frobbed toml for mmun/redis-nickel-server written to work/ex/beta-1.38-1/sources/1.37.0/gh/mmun/redis-nickel-server/Cargo.toml
[INFO] started frobbing mmun/redis-nickel-server
[INFO] finished frobbing mmun/redis-nickel-server
[INFO] frobbed toml for mmun/redis-nickel-server written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mmun/redis-nickel-server/Cargo.toml
[INFO] crate mmun/redis-nickel-server 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/mmun/redis-nickel-server/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[INFO] the lockfile is outdated, regenerating it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 mmun/redis-nickel-server 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-2/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/mmun/redis-nickel-server:/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] cf09c8a47283452323a8f1c46dea52a35ad90788043c59b20f9c4f850dca379e
[INFO] running `"docker" "start" "-a" "cf09c8a47283452323a8f1c46dea52a35ad90788043c59b20f9c4f850dca379e"`
[INFO] [stderr]    Compiling either v1.5.2
[INFO] [stderr]    Compiling ascii v0.9.2
[INFO] [stderr]    Compiling mustache v0.9.0
[INFO] [stderr]    Compiling combine v3.8.1
[INFO] [stderr]    Compiling nickel v0.11.0
[INFO] [stderr]    Compiling redis v0.11.0
[INFO] [stderr]    Compiling redis-nickel-server v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused imports: `Connection`, `RedisResult`
[INFO] [stderr]   --> src/main.rs:16:23
[INFO] [stderr]    |
[INFO] [stderr] 16 | use redis::{Commands, Connection, RedisResult};
[INFO] [stderr]    |                       ^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0596]: cannot borrow `*redis_conn` as mutable, as it is behind a `&` reference
[INFO] [stderr]   --> src/main.rs:55:40
[INFO] [stderr]    |
[INFO] [stderr] 52 |     let redis_conn = &redis_conn_lock.lock().unwrap();
[INFO] [stderr]    |                      -------------------------------- help: consider changing this to be a mutable reference: `&mut redis_conn_lock.lock().unwrap()`
[INFO] [stderr] ...
[INFO] [stderr] 55 |         None | Some("current") => try!(redis_conn.get("my-app:current")),
[INFO] [stderr]    |                                        ^^^^^^^^^^ `redis_conn` is a `&` reference, so the data it refers to cannot be borrowed as mutable
[INFO] [stderr] 
[INFO] [stderr] error[E0596]: cannot borrow `*redis_conn` as mutable, as it is behind a `&` reference
[INFO] [stderr]   --> src/main.rs:59:5
[INFO] [stderr]    |
[INFO] [stderr] 52 |     let redis_conn = &redis_conn_lock.lock().unwrap();
[INFO] [stderr]    |                      -------------------------------- help: consider changing this to be a mutable reference: `&mut redis_conn_lock.lock().unwrap()`
[INFO] [stderr] ...
[INFO] [stderr] 59 |     redis_conn.get(key)
[INFO] [stderr]    |     ^^^^^^^^^^ `redis_conn` is a `&` reference, so the data it refers to cannot be borrowed as mutable
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0596`.
[INFO] [stderr] error: Could not compile `redis-nickel-server`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "cf09c8a47283452323a8f1c46dea52a35ad90788043c59b20f9c4f850dca379e"`
[INFO] running `"docker" "rm" "-f" "cf09c8a47283452323a8f1c46dea52a35ad90788043c59b20f9c4f850dca379e"`
[INFO] [stdout] cf09c8a47283452323a8f1c46dea52a35ad90788043c59b20f9c4f850dca379e