[INFO] updating cached repository EthanLuisMcDonough/json-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/EthanLuisMcDonough/json-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/EthanLuisMcDonough/json-rs" "work/ex/pr-60944/sources/master#589beb979c0f1a9736e02e578913db88398c3ba5/gh/EthanLuisMcDonough/json-rs"`
[INFO] [stderr] Cloning into 'work/ex/pr-60944/sources/master#589beb979c0f1a9736e02e578913db88398c3ba5/gh/EthanLuisMcDonough/json-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/EthanLuisMcDonough/json-rs" "work/ex/pr-60944/sources/try#42445ded8fd34235a676755cb5d079658ed51f6a/gh/EthanLuisMcDonough/json-rs"`
[INFO] [stderr] Cloning into 'work/ex/pr-60944/sources/try#42445ded8fd34235a676755cb5d079658ed51f6a/gh/EthanLuisMcDonough/json-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3ebc8dcf82b623fe5fc2a1fcf5f6aa7c6ad6af6e
[INFO] sha for GitHub repo EthanLuisMcDonough/json-rs: 3ebc8dcf82b623fe5fc2a1fcf5f6aa7c6ad6af6e
[INFO] validating manifest of EthanLuisMcDonough/json-rs on toolchain master#589beb979c0f1a9736e02e578913db88398c3ba5
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+589beb979c0f1a9736e02e578913db88398c3ba5-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of EthanLuisMcDonough/json-rs on toolchain try#42445ded8fd34235a676755cb5d079658ed51f6a
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+42445ded8fd34235a676755cb5d079658ed51f6a-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing EthanLuisMcDonough/json-rs
[INFO] finished frobbing EthanLuisMcDonough/json-rs
[INFO] frobbed toml for EthanLuisMcDonough/json-rs written to work/ex/pr-60944/sources/master#589beb979c0f1a9736e02e578913db88398c3ba5/gh/EthanLuisMcDonough/json-rs/Cargo.toml
[INFO] started frobbing EthanLuisMcDonough/json-rs
[INFO] finished frobbing EthanLuisMcDonough/json-rs
[INFO] frobbed toml for EthanLuisMcDonough/json-rs written to work/ex/pr-60944/sources/try#42445ded8fd34235a676755cb5d079658ed51f6a/gh/EthanLuisMcDonough/json-rs/Cargo.toml
[INFO] crate EthanLuisMcDonough/json-rs already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+589beb979c0f1a9736e02e578913db88398c3ba5-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+42445ded8fd34235a676755cb5d079658ed51f6a-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking EthanLuisMcDonough/json-rs against master#589beb979c0f1a9736e02e578913db88398c3ba5 for pr-60944
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60944/worker-5/master#589beb979c0f1a9736e02e578913db88398c3ba5:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60944/sources/master#589beb979c0f1a9736e02e578913db88398c3ba5/gh/EthanLuisMcDonough/json-rs:/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" "+589beb979c0f1a9736e02e578913db88398c3ba5-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 1b774e8799d477e32de521de015fd5a42ee8cb8bd1eb9ee9a78def77bd1998c9
[INFO] running `"docker" "start" "-a" "1b774e8799d477e32de521de015fd5a42ee8cb8bd1eb9ee9a78def77bd1998c9"`
[INFO] [stderr]     Checking json-rs v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: the item `drop` is imported redundantly
[INFO] [stderr]    --> src/stack/pending.rs:160:35
[INFO] [stderr]     |
[INFO] [stderr] 160 |         use std::{char::from_u32, mem::drop};
[INFO] [stderr]     |                                   ^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the item `drop` is imported redundantly
[INFO] [stderr]    --> src/stack/pending.rs:160:35
[INFO] [stderr]     |
[INFO] [stderr] 160 |         use std::{char::from_u32, mem::drop};
[INFO] [stderr]     |                                   ^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:260:13
[INFO] [stderr]     |
[INFO] [stderr] 260 |         let mut last = processing.take();
[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/lib.rs:260:13
[INFO] [stderr]     |
[INFO] [stderr] 260 |         let mut last = processing.take();
[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/stack/object.rs:331:17
[INFO] [stderr]     |
[INFO] [stderr] 331 |             let mut stack = ObjectStack { inner };
[INFO] [stderr]     |                 ----^^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.26s
[INFO] running `"docker" "inspect" "1b774e8799d477e32de521de015fd5a42ee8cb8bd1eb9ee9a78def77bd1998c9"`
[INFO] running `"docker" "rm" "-f" "1b774e8799d477e32de521de015fd5a42ee8cb8bd1eb9ee9a78def77bd1998c9"`
[INFO] [stdout] 1b774e8799d477e32de521de015fd5a42ee8cb8bd1eb9ee9a78def77bd1998c9