Nov 30 23:01:30.856 INFO checking file_diff-1.0.0 against try#32252761328f59ccfadb1bafb8148c685bc830b3 for pr-56323
Nov 30 23:01:30.856 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56323/worker-4/try#32252761328f59ccfadb1bafb8148c685bc830b3:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-56323/try#32252761328f59ccfadb1bafb8148c685bc830b3:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +32252761328f59ccfadb1bafb8148c685bc830b3-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Nov 30 23:01:31.203 INFO [stdout] 8909c7fd6796e4c77aa480e3f452e9447b2cf544a1a933b99bfc8720bb7bd152
Nov 30 23:01:31.205 INFO running `"docker" "start" "-a" "8909c7fd6796e4c77aa480e3f452e9447b2cf544a1a933b99bfc8720bb7bd152"`
Nov 30 23:01:31.561 INFO [stderr] usermod: no changes
Nov 30 23:01:31.588 INFO [stderr]     Checking file_diff v1.0.0 (/source)
Nov 30 23:01:32.159 INFO [stderr] warning: variable does not need to be mutable
Nov 30 23:01:32.159 INFO [stderr]   --> src/lib.rs:49:9
Nov 30 23:01:32.159 INFO [stderr]    |
Nov 30 23:01:32.159 INFO [stderr] 49 |     let mut buff1 : &mut [u8] = &mut [0; 1024];
Nov 30 23:01:32.159 INFO [stderr]    |         ----^^^^^
Nov 30 23:01:32.159 INFO [stderr]    |         |
Nov 30 23:01:32.159 INFO [stderr]    |         help: remove this `mut`
Nov 30 23:01:32.159 INFO [stderr]    |
Nov 30 23:01:32.159 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Nov 30 23:01:32.159 INFO [stderr] 
Nov 30 23:01:32.159 INFO [stderr] warning: variable does not need to be mutable
Nov 30 23:01:32.159 INFO [stderr]   --> src/lib.rs:50:9
Nov 30 23:01:32.159 INFO [stderr]    |
Nov 30 23:01:32.160 INFO [stderr] 50 |     let mut buff2 : &mut [u8] = &mut [0; 1024];
Nov 30 23:01:32.160 INFO [stderr]    |         ----^^^^^
Nov 30 23:01:32.160 INFO [stderr]    |         |
Nov 30 23:01:32.160 INFO [stderr]    |         help: remove this `mut`
Nov 30 23:01:32.160 INFO [stderr] 
Nov 30 23:01:32.401 INFO [stderr] warning: variable does not need to be mutable
Nov 30 23:01:32.401 INFO [stderr]   --> src/lib.rs:49:9
Nov 30 23:01:32.401 INFO [stderr]    |
Nov 30 23:01:32.401 INFO [stderr] 49 |     let mut buff1 : &mut [u8] = &mut [0; 1024];
Nov 30 23:01:32.401 INFO [stderr]    |         ----^^^^^
Nov 30 23:01:32.401 INFO [stderr]    |         |
Nov 30 23:01:32.401 INFO [stderr]    |         help: remove this `mut`
Nov 30 23:01:32.404 INFO [stderr]    |
Nov 30 23:01:32.404 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Nov 30 23:01:32.404 INFO [stderr] 
Nov 30 23:01:32.404 INFO [stderr] warning: variable does not need to be mutable
Nov 30 23:01:32.404 INFO [stderr]   --> src/lib.rs:50:9
Nov 30 23:01:32.404 INFO [stderr]    |
Nov 30 23:01:32.404 INFO [stderr] 50 |     let mut buff2 : &mut [u8] = &mut [0; 1024];
Nov 30 23:01:32.404 INFO [stderr]    |         ----^^^^^
Nov 30 23:01:32.404 INFO [stderr]    |         |
Nov 30 23:01:32.404 INFO [stderr]    |         help: remove this `mut`
Nov 30 23:01:32.404 INFO [stderr] 
Nov 30 23:01:32.419 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.84s
Nov 30 23:01:32.421 INFO [stderr] su: No module specific data is present
Nov 30 23:01:32.968 INFO running `"docker" "inspect" "8909c7fd6796e4c77aa480e3f452e9447b2cf544a1a933b99bfc8720bb7bd152"`
Nov 30 23:01:33.116 INFO running `"docker" "rm" "-f" "8909c7fd6796e4c77aa480e3f452e9447b2cf544a1a933b99bfc8720bb7bd152"`
Nov 30 23:01:33.258 INFO [stdout] 8909c7fd6796e4c77aa480e3f452e9447b2cf544a1a933b99bfc8720bb7bd152