[INFO] updating cached repository jordanbray/chess_perft
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jordanbray/chess_perft
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jordanbray/chess_perft" "work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/jordanbray/chess_perft"`
[INFO] [stderr] Cloning into 'work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/jordanbray/chess_perft'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jordanbray/chess_perft" "work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/jordanbray/chess_perft"`
[INFO] [stderr] Cloning into 'work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/jordanbray/chess_perft'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] bbe794544cdac3b8f653fc370eea7c859b7f29aa
[INFO] sha for GitHub repo jordanbray/chess_perft: bbe794544cdac3b8f653fc370eea7c859b7f29aa
[INFO] validating manifest of jordanbray/chess_perft on toolchain master#435236b8877cdb98c82eaebfb7887782277265c5
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of jordanbray/chess_perft on toolchain try#b5c7f157c20453dde8d47371abe73b32351b4e7f
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing jordanbray/chess_perft
[INFO] finished frobbing jordanbray/chess_perft
[INFO] frobbed toml for jordanbray/chess_perft written to work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/jordanbray/chess_perft/Cargo.toml
[INFO] started frobbing jordanbray/chess_perft
[INFO] finished frobbing jordanbray/chess_perft
[INFO] frobbed toml for jordanbray/chess_perft written to work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/jordanbray/chess_perft/Cargo.toml
[INFO] crate jordanbray/chess_perft already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking jordanbray/chess_perft against try#b5c7f157c20453dde8d47371abe73b32351b4e7f for pr-62849
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62849/worker-6/try#b5c7f157c20453dde8d47371abe73b32351b4e7f:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/jordanbray/chess_perft:/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=forbid" "-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" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 5f1dc3f90c92e75ae395dbc02af238bdbe1f99c791c3fd459a9da82db4223792
[INFO] running `"docker" "start" "-a" "5f1dc3f90c92e75ae395dbc02af238bdbe1f99c791c3fd459a9da82db4223792"`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling syn v0.15.34
[INFO] [stderr]    Compiling libc v0.2.55
[INFO] [stderr]    Compiling cc v1.0.37
[INFO] [stderr]    Compiling autocfg v0.1.1
[INFO] [stderr]    Compiling num-traits v0.2.4
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling arrayvec v0.4.10
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]     Checking rustc-demangle v0.1.14
[INFO] [stderr]     Checking nodrop v0.1.13
[INFO] [stderr]     Checking bencher v0.1.5
[INFO] [stderr]     Checking getopts v0.2.14
[INFO] [stderr] warning[E0503]: cannot use `state` because it was mutably borrowed
[INFO] [stderr]     --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/getopts-0.2.14/src/lib.rs:1008:33
[INFO] [stderr]      |
[INFO] [stderr] 955  |     let mut machine = |cont: &mut bool, (i, c): (usize, char)| {
[INFO] [stderr]      |                       ---------------------------------------- borrow of `state` occurs here
[INFO] [stderr] ...
[INFO] [stderr] 959  |         state = match (state, whitespace, limit) {
[INFO] [stderr]      |                        ----- borrow occurs due to use of `state` in closure
[INFO] [stderr] ...
[INFO] [stderr] 1008 |     while cont && match state { B | C => true, A => false } {
[INFO] [stderr]      |                                 ^ use of borrowed `state`
[INFO] [stderr] 1009 |         machine(&mut cont, (fake_i, ' '));
[INFO] [stderr]      |         ------- borrow later used here
[INFO] [stderr]      |
[INFO] [stderr]      = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
[INFO] [stderr]      = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
[INFO] [stderr]      = note: for more information, try `rustc --explain E0729`
[INFO] [stderr] 
[INFO] [stderr]    Compiling backtrace v0.3.26
[INFO] [stderr]    Compiling quote v0.6.12
[INFO] [stderr]    Compiling rand v0.4.2
[INFO] [stderr]     Checking btoi v0.4.0
[INFO] [stderr]    Compiling shakmaty v0.14.1
[INFO] [stderr]    Compiling chess v3.1.0
[INFO] [stderr]    Compiling synstructure v0.10.2
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]     Checking failure v0.1.5
[INFO] [stderr]     Checking chess_perft v3.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [optimized + debuginfo] target(s) in 2m 18s
[INFO] running `"docker" "inspect" "5f1dc3f90c92e75ae395dbc02af238bdbe1f99c791c3fd459a9da82db4223792"`
[INFO] running `"docker" "rm" "-f" "5f1dc3f90c92e75ae395dbc02af238bdbe1f99c791c3fd459a9da82db4223792"`
[INFO] [stdout] 5f1dc3f90c92e75ae395dbc02af238bdbe1f99c791c3fd459a9da82db4223792