[INFO] crate persy 0.5.0 is already in cache
[INFO] extracting crate persy 0.5.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/persy/0.5.0
[INFO] extracting crate persy 0.5.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/persy/0.5.0
[INFO] validating manifest of persy-0.5.0 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of persy-0.5.0 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing persy-0.5.0
[INFO] finished frobbing persy-0.5.0
[INFO] frobbed toml for persy-0.5.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/persy/0.5.0/Cargo.toml
[INFO] started frobbing persy-0.5.0
[INFO] finished frobbing persy-0.5.0
[INFO] frobbed toml for persy-0.5.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/persy/0.5.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing persy-0.5.0 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/persy/0.5.0:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 363209f2d05126b48a36a9e94d3eab209e5b5e8721c4692221da3c629899e17c
[INFO] running `"docker" "start" "-a" "363209f2d05126b48a36a9e94d3eab209e5b5e8721c4692221da3c629899e17c"`
[INFO] [stderr]    Compiling unsigned-varint v0.2.2
[INFO] [stderr]    Compiling fs2 v0.4.3
[INFO] [stderr]    Compiling persy v0.5.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/index/tree.rs:696:32
[INFO] [stderr]     |
[INFO] [stderr] 696 |                     Node::LEAF(mut leaf) => {
[INFO] [stderr]     |                                ----^^^^
[INFO] [stderr]     |                                |
[INFO] [stderr]     |                                help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/index/tree.rs:722:32
[INFO] [stderr]     |
[INFO] [stderr] 722 |                     Node::LEAF(mut leaf) => {
[INFO] [stderr]     |                                ----^^^^
[INFO] [stderr]     |                                |
[INFO] [stderr]     |                                help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/snapshot.rs:118:25
[INFO] [stderr]     |
[INFO] [stderr] 118 |                     let mut vec = v.get_mut();
[INFO] [stderr]     |                         ----^^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/snapshot.rs:124:31
[INFO] [stderr]     |
[INFO] [stderr] 124 |                 Entry::Vacant(mut e) => {
[INFO] [stderr]     |                               ----^
[INFO] [stderr]     |                               |
[INFO] [stderr]     |                               help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/snapshot.rs:179:33
[INFO] [stderr]     |
[INFO] [stderr] 179 |                     if let Some(mut v) = lock.mapping.get_mut(&record.id) {
[INFO] [stderr]     |                                 ----^
[INFO] [stderr]     |                                 |
[INFO] [stderr]     |                                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `persy`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name persy src/lib.rs --color never --crate-type lib --emit=dep-info,metadata,link -C debuginfo=2 -C metadata=de3a7ad464011599 -C extra-filename=-de3a7ad464011599 --out-dir /opt/crater/target/debug/deps -L dependency=/opt/crater/target/debug/deps --extern byteorder=/opt/crater/target/debug/deps/libbyteorder-1ca0e27fd3a97256.rlib --extern crc=/opt/crater/target/debug/deps/libcrc-e790c3c4ab96a0d5.rlib --extern data_encoding=/opt/crater/target/debug/deps/libdata_encoding-a9247c1fd6fe52bb.rlib --extern fs2=/opt/crater/target/debug/deps/libfs2-7df2c8f08ccd2603.rlib --extern linked_hash_map=/opt/crater/target/debug/deps/liblinked_hash_map-938e708a1661229b.rlib --extern rand=/opt/crater/target/debug/deps/librand-90f16bd48677b73c.rlib --extern unsigned_varint=/opt/crater/target/debug/deps/libunsigned_varint-47bf57af63bbd2dd.rlib --cap-lints=warn` (signal: 9, SIGKILL: kill)
[INFO] running `"docker" "inspect" "363209f2d05126b48a36a9e94d3eab209e5b5e8721c4692221da3c629899e17c"`
[INFO] running `"docker" "rm" "-f" "363209f2d05126b48a36a9e94d3eab209e5b5e8721c4692221da3c629899e17c"`
[INFO] [stdout] 363209f2d05126b48a36a9e94d3eab209e5b5e8721c4692221da3c629899e17c