Dec 18 09:04:54.480 INFO checking xi-rpc-0.2.0 against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 09:04:54.480 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-1/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/reg/xi-rpc/0.2.0:/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" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 09:04:54.812 INFO [stdout] fbd7a57d7f3cb99cc4d3f0ad493307d6788e73bb01685359d054f36bc4287ce7
Dec 18 09:04:54.818 INFO running `"docker" "start" "-a" "fbd7a57d7f3cb99cc4d3f0ad493307d6788e73bb01685359d054f36bc4287ce7"`
Dec 18 09:04:56.316 INFO [stderr]     Checking xi-rpc v0.2.0 (/opt/crater/workdir)
Dec 18 09:04:56.832 INFO [stderr] warning: variable does not need to be mutable
Dec 18 09:04:56.832 INFO [stderr]    --> src/lib.rs:326:13
Dec 18 09:04:56.832 INFO [stderr]     |
Dec 18 09:04:56.832 INFO [stderr] 326 |         let mut dict = response.as_object_mut().unwrap();
Dec 18 09:04:56.832 INFO [stderr]     |             ----^^^^
Dec 18 09:04:56.832 INFO [stderr]     |             |
Dec 18 09:04:56.832 INFO [stderr]     |             help: remove this `mut`
Dec 18 09:04:56.832 INFO [stderr]     |
Dec 18 09:04:56.832 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 18 09:04:56.832 INFO [stderr] 
Dec 18 09:04:56.832 INFO [stderr] warning: variable does not need to be mutable
Dec 18 09:04:56.832 INFO [stderr]    --> src/lib.rs:393:9
Dec 18 09:04:56.832 INFO [stderr]     |
Dec 18 09:04:56.832 INFO [stderr] 393 |     let mut dict_ref = dict.as_object_mut().expect("dict_add_value passed non-object.");
Dec 18 09:04:56.832 INFO [stderr]     |         ----^^^^^^^^
Dec 18 09:04:56.832 INFO [stderr]     |         |
Dec 18 09:04:56.832 INFO [stderr]     |         help: remove this `mut`
Dec 18 09:04:56.832 INFO [stderr] 
Dec 18 09:04:56.892 INFO [stderr] warning: variable does not need to be mutable
Dec 18 09:04:56.892 INFO [stderr]    --> src/lib.rs:326:13
Dec 18 09:04:56.892 INFO [stderr]     |
Dec 18 09:04:56.892 INFO [stderr] 326 |         let mut dict = response.as_object_mut().unwrap();
Dec 18 09:04:56.892 INFO [stderr]     |             ----^^^^
Dec 18 09:04:56.892 INFO [stderr]     |             |
Dec 18 09:04:56.892 INFO [stderr]     |             help: remove this `mut`
Dec 18 09:04:56.892 INFO [stderr]     |
Dec 18 09:04:56.892 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 18 09:04:56.892 INFO [stderr] 
Dec 18 09:04:56.903 INFO [stderr] warning: variable does not need to be mutable
Dec 18 09:04:56.903 INFO [stderr]    --> src/lib.rs:393:9
Dec 18 09:04:56.903 INFO [stderr]     |
Dec 18 09:04:56.903 INFO [stderr] 393 |     let mut dict_ref = dict.as_object_mut().expect("dict_add_value passed non-object.");
Dec 18 09:04:56.903 INFO [stderr]     |         ----^^^^^^^^
Dec 18 09:04:56.903 INFO [stderr]     |         |
Dec 18 09:04:56.903 INFO [stderr]     |         help: remove this `mut`
Dec 18 09:04:56.903 INFO [stderr] 
Dec 18 09:04:57.258 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.00s
Dec 18 09:04:57.594 INFO running `"docker" "inspect" "fbd7a57d7f3cb99cc4d3f0ad493307d6788e73bb01685359d054f36bc4287ce7"`
Dec 18 09:04:57.709 INFO running `"docker" "rm" "-f" "fbd7a57d7f3cb99cc4d3f0ad493307d6788e73bb01685359d054f36bc4287ce7"`
Dec 18 09:04:57.832 INFO [stdout] fbd7a57d7f3cb99cc4d3f0ad493307d6788e73bb01685359d054f36bc4287ce7