[INFO] updating cached repository nrlsk/cistern
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/nrlsk/cistern
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/nrlsk/cistern" "work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/nrlsk/cistern"`
[INFO] [stderr] Cloning into 'work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/nrlsk/cistern'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/nrlsk/cistern" "work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/nrlsk/cistern"`
[INFO] [stderr] Cloning into 'work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/nrlsk/cistern'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7ed3705620439db24b2834e1dc7080b7c353e5a6
[INFO] sha for GitHub repo nrlsk/cistern: 7ed3705620439db24b2834e1dc7080b7c353e5a6
[INFO] validating manifest of nrlsk/cistern 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 nrlsk/cistern 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 nrlsk/cistern
[INFO] finished frobbing nrlsk/cistern
[INFO] frobbed toml for nrlsk/cistern written to work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/nrlsk/cistern/Cargo.toml
[INFO] started frobbing nrlsk/cistern
[INFO] finished frobbing nrlsk/cistern
[INFO] frobbed toml for nrlsk/cistern written to work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/nrlsk/cistern/Cargo.toml
[INFO] crate nrlsk/cistern 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 nrlsk/cistern 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/nrlsk/cistern:/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] c6ec8afb2257b9ebaf30fd1f742d32fcba798eb671f01b4ed5fc6db9100b27f9
[INFO] running `"docker" "start" "-a" "c6ec8afb2257b9ebaf30fd1f742d32fcba798eb671f01b4ed5fc6db9100b27f9"`
[INFO] [stderr]     Checking miniz-sys v0.1.11
[INFO] [stderr]     Checking threadpool v1.7.1
[INFO] [stderr]     Checking hyper v0.10.15
[INFO] [stderr]     Checking chrono v0.4.6
[INFO] [stderr]     Checking uuid v0.5.1
[INFO] [stderr]    Compiling openssl v0.9.24
[INFO] [stderr]    Compiling structopt-derive v0.2.15
[INFO] [stderr]    Compiling mime_guess v1.8.6
[INFO] [stderr]     Checking failure v0.1.5
[INFO] [stderr]     Checking dotenv v0.13.0
[INFO] [stderr]     Checking flate2 v1.0.7
[INFO] [stderr]     Checking structopt v0.2.15
[INFO] [stderr]     Checking native-tls v0.1.5
[INFO] [stderr]     Checking multipart v0.13.6
[INFO] [stderr]     Checking hyper-native-tls v0.2.4
[INFO] [stderr]     Checking evzht9h3nznqzwl v0.0.3
[INFO] [stderr]     Checking serenity v0.5.13
[INFO] [stderr]     Checking cistern_bot v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:62:9
[INFO] [stderr]    |
[INFO] [stderr] 62 |     let mut token: String;
[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/main.rs:74:9
[INFO] [stderr]    |
[INFO] [stderr] 74 |     let mut prefix: String;
[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/main.rs:62:9
[INFO] [stderr]    |
[INFO] [stderr] 62 |     let mut token: String;
[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/main.rs:74:9
[INFO] [stderr]    |
[INFO] [stderr] 74 |     let mut prefix: String;
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 46.54s
[INFO] running `"docker" "inspect" "c6ec8afb2257b9ebaf30fd1f742d32fcba798eb671f01b4ed5fc6db9100b27f9"`
[INFO] running `"docker" "rm" "-f" "c6ec8afb2257b9ebaf30fd1f742d32fcba798eb671f01b4ed5fc6db9100b27f9"`
[INFO] [stdout] c6ec8afb2257b9ebaf30fd1f742d32fcba798eb671f01b4ed5fc6db9100b27f9