[INFO] updating cached repository JakRowan/synacor-vm
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/JakRowan/synacor-vm
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/JakRowan/synacor-vm" "work/ex/beta-1.37-6/sources/1.36.0/gh/JakRowan/synacor-vm"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/JakRowan/synacor-vm'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/JakRowan/synacor-vm" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/JakRowan/synacor-vm"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/JakRowan/synacor-vm'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 46af34167d915f71207c88f576e070ae21fcfe61
[INFO] sha for GitHub repo JakRowan/synacor-vm: 46af34167d915f71207c88f576e070ae21fcfe61
[INFO] validating manifest of JakRowan/synacor-vm 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 JakRowan/synacor-vm 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 JakRowan/synacor-vm
[INFO] finished frobbing JakRowan/synacor-vm
[INFO] frobbed toml for JakRowan/synacor-vm written to work/ex/beta-1.37-6/sources/1.36.0/gh/JakRowan/synacor-vm/Cargo.toml
[INFO] started frobbing JakRowan/synacor-vm
[INFO] finished frobbing JakRowan/synacor-vm
[INFO] frobbed toml for JakRowan/synacor-vm written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/JakRowan/synacor-vm/Cargo.toml
[INFO] crate JakRowan/synacor-vm already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/JakRowan/synacor-vm/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[INFO] the lockfile is outdated, regenerating it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" "+1.36.0" "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 JakRowan/synacor-vm 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-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/JakRowan/synacor-vm:/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] 7b78ee60148a0dd499f4e0cbf3e442d82973524a53aa81282dabdad1c5915a70
[INFO] running `"docker" "start" "-a" "7b78ee60148a0dd499f4e0cbf3e442d82973524a53aa81282dabdad1c5915a70"`
[INFO] [stderr]    Compiling synacor v0.2.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/vm.rs:78:13
[INFO] [stderr]    |
[INFO] [stderr] 78 |         for mut x in self.mem.as_mut().into_iter() {
[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]     Finished dev [unoptimized + debuginfo] target(s) in 1.54s
[INFO] running `"docker" "inspect" "7b78ee60148a0dd499f4e0cbf3e442d82973524a53aa81282dabdad1c5915a70"`
[INFO] running `"docker" "rm" "-f" "7b78ee60148a0dd499f4e0cbf3e442d82973524a53aa81282dabdad1c5915a70"`
[INFO] [stdout] 7b78ee60148a0dd499f4e0cbf3e442d82973524a53aa81282dabdad1c5915a70
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/JakRowan/synacor-vm:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] 4bd3c080e217d45dca53c63f5e4525f181280b0eb238e873a23187d4f9cbc2f8
[INFO] running `"docker" "start" "-a" "4bd3c080e217d45dca53c63f5e4525f181280b0eb238e873a23187d4f9cbc2f8"`
[INFO] [stderr]    Compiling synacor v0.2.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/vm.rs:78:13
[INFO] [stderr]    |
[INFO] [stderr] 78 |         for mut x in self.mem.as_mut().into_iter() {
[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]     Finished dev [unoptimized + debuginfo] target(s) in 1.23s
[INFO] running `"docker" "inspect" "4bd3c080e217d45dca53c63f5e4525f181280b0eb238e873a23187d4f9cbc2f8"`
[INFO] running `"docker" "rm" "-f" "4bd3c080e217d45dca53c63f5e4525f181280b0eb238e873a23187d4f9cbc2f8"`
[INFO] [stdout] 4bd3c080e217d45dca53c63f5e4525f181280b0eb238e873a23187d4f9cbc2f8
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/JakRowan/synacor-vm:/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" "test" "--frozen"`
[INFO] [stdout] 53d0ce8182c8c9325ee1662e595b4b4d2c9377ab73356d9b1619a7cdd1d1cfb2
[INFO] running `"docker" "start" "-a" "53d0ce8182c8c9325ee1662e595b4b4d2c9377ab73356d9b1619a7cdd1d1cfb2"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/synacor-ca3ae1c96d719747
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/synacor-9252c008642434d1
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests synacor
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "53d0ce8182c8c9325ee1662e595b4b4d2c9377ab73356d9b1619a7cdd1d1cfb2"`
[INFO] running `"docker" "rm" "-f" "53d0ce8182c8c9325ee1662e595b4b4d2c9377ab73356d9b1619a7cdd1d1cfb2"`
[INFO] [stdout] 53d0ce8182c8c9325ee1662e595b4b4d2c9377ab73356d9b1619a7cdd1d1cfb2