[INFO] updating cached repository JJJollyjim/mathsbot
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/JJJollyjim/mathsbot
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/JJJollyjim/mathsbot" "work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/gh/JJJollyjim/mathsbot"`
[INFO] [stderr] Cloning into 'work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/gh/JJJollyjim/mathsbot'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/JJJollyjim/mathsbot" "work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/gh/JJJollyjim/mathsbot"`
[INFO] [stderr] Cloning into 'work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/gh/JJJollyjim/mathsbot'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4da2c435fae9247bd5a099e1b00c88059ddbdcde
[INFO] sha for GitHub repo JJJollyjim/mathsbot: 4da2c435fae9247bd5a099e1b00c88059ddbdcde
[INFO] validating manifest of JJJollyjim/mathsbot on toolchain master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+8869ee03d7f258e1b76a11c6fbb01b5708a9f504-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of JJJollyjim/mathsbot on toolchain try#58b21121d0b447ceb3f1a655155d802191acf044
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+58b21121d0b447ceb3f1a655155d802191acf044-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing JJJollyjim/mathsbot
[INFO] finished frobbing JJJollyjim/mathsbot
[INFO] frobbed toml for JJJollyjim/mathsbot written to work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/gh/JJJollyjim/mathsbot/Cargo.toml
[INFO] started frobbing JJJollyjim/mathsbot
[INFO] finished frobbing JJJollyjim/mathsbot
[INFO] frobbed toml for JJJollyjim/mathsbot written to work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/gh/JJJollyjim/mathsbot/Cargo.toml
[INFO] crate JJJollyjim/mathsbot already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+8869ee03d7f258e1b76a11c6fbb01b5708a9f504-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+58b21121d0b447ceb3f1a655155d802191acf044-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking JJJollyjim/mathsbot against master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504 for pr-61100
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-61100/worker-1/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/gh/JJJollyjim/mathsbot:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/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" "+8869ee03d7f258e1b76a11c6fbb01b5708a9f504-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 79016d1a8d93525f2113829186d2e538c9724a24abbb59963afce812fbc147c4
[INFO] running `"docker" "start" "-a" "79016d1a8d93525f2113829186d2e538c9724a24abbb59963afce812fbc147c4"`
[INFO] [stderr]     Checking serde v1.0.51
[INFO] [stderr]     Checking vec_shift v0.1.0
[INFO] [stderr]     Checking base64 v0.7.0
[INFO] [stderr]    Compiling serde_derive v1.0.51
[INFO] [stderr]     Checking env_logger v0.4.3
[INFO] [stderr]     Checking evzht9h3nznqzwl v0.0.2
[INFO] [stderr]     Checking hyper-native-tls v0.2.4
[INFO] [stderr]     Checking multipart v0.13.6
[INFO] [stderr]     Checking serde_json v1.0.17
[INFO] [stderr]     Checking chrono v0.4.2
[INFO] [stderr]     Checking serenity v0.4.8
[INFO] [stderr] warning[E0713]: borrow may still be in use when destructor runs
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/serenity-0.4.8/src/framework/standard/args.rs:127:13
[INFO] [stderr]     |
[INFO] [stderr] 116 |         fn get_and_remove(b: &mut Vec<String>) -> Option<&str> {
[INFO] [stderr]     |                              - let's call the lifetime of this reference `'1`
[INFO] [stderr] ...
[INFO] [stderr] 127 |             GetThenRemove(b).0.get(0).map(|s| s.as_str())
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^---------------------------
[INFO] [stderr]     |             |
[INFO] [stderr]     |             returning this value requires that borrow lasts for `'1`
[INFO] [stderr] 128 |         }
[INFO] [stderr]     |         - here is drop of temporary value; whose type `framework::standard::args::Args::single_zc::get_and_remove::GetThenRemove<'_>` implements the `Drop` trait
[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]     Checking mathsbot v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 32.57s
[INFO] running `"docker" "inspect" "79016d1a8d93525f2113829186d2e538c9724a24abbb59963afce812fbc147c4"`
[INFO] running `"docker" "rm" "-f" "79016d1a8d93525f2113829186d2e538c9724a24abbb59963afce812fbc147c4"`
[INFO] [stdout] 79016d1a8d93525f2113829186d2e538c9724a24abbb59963afce812fbc147c4