Dec 17 22:49:05.638 INFO checking irazorx1/markov_chain against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 17 22:49:05.638 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/gh/irazorx1/markov_chain:/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 17 22:49:05.825 INFO [stdout] 3503bf76ca62beec5076d054c2eaa3f427aec3784ec3728278d3328fc0a7f2bd
Dec 17 22:49:05.831 INFO running `"docker" "start" "-a" "3503bf76ca62beec5076d054c2eaa3f427aec3784ec3728278d3328fc0a7f2bd"`
Dec 17 22:49:06.421 INFO [stderr]     Checking markov_chain v0.1.0 (/opt/crater/workdir)
Dec 17 22:49:06.614 INFO [stderr] warning: unused import: `std::io`
Dec 17 22:49:06.614 INFO [stderr]  --> src/main.rs:6:5
Dec 17 22:49:06.614 INFO [stderr]   |
Dec 17 22:49:06.614 INFO [stderr] 6 | use std::io;
Dec 17 22:49:06.614 INFO [stderr]   |     ^^^^^^^
Dec 17 22:49:06.614 INFO [stderr]   |
Dec 17 22:49:06.614 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 17 22:49:06.614 INFO [stderr] 
Dec 17 22:49:06.614 INFO [stderr] warning: unused import: `std::io::prelude::*`
Dec 17 22:49:06.614 INFO [stderr]  --> src/main.rs:7:5
Dec 17 22:49:06.614 INFO [stderr]   |
Dec 17 22:49:06.614 INFO [stderr] 7 | use std::io::prelude::*;
Dec 17 22:49:06.614 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^
Dec 17 22:49:06.614 INFO [stderr] 
Dec 17 22:49:06.614 INFO [stderr] warning: unused import: `std::fs::File`
Dec 17 22:49:06.614 INFO [stderr]  --> src/main.rs:8:5
Dec 17 22:49:06.614 INFO [stderr]   |
Dec 17 22:49:06.614 INFO [stderr] 8 | use std::fs::File;
Dec 17 22:49:06.614 INFO [stderr]   |     ^^^^^^^^^^^^^
Dec 17 22:49:06.614 INFO [stderr] 
Dec 17 22:49:06.628 INFO [stderr] warning: unused import: `std::io`
Dec 17 22:49:06.628 INFO [stderr]  --> src/main.rs:6:5
Dec 17 22:49:06.628 INFO [stderr]   |
Dec 17 22:49:06.628 INFO [stderr] 6 | use std::io;
Dec 17 22:49:06.628 INFO [stderr]   |     ^^^^^^^
Dec 17 22:49:06.628 INFO [stderr]   |
Dec 17 22:49:06.629 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 17 22:49:06.629 INFO [stderr] 
Dec 17 22:49:06.629 INFO [stderr] warning: unused import: `std::io::prelude::*`
Dec 17 22:49:06.629 INFO [stderr]  --> src/main.rs:7:5
Dec 17 22:49:06.629 INFO [stderr]   |
Dec 17 22:49:06.629 INFO [stderr] 7 | use std::io::prelude::*;
Dec 17 22:49:06.629 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^
Dec 17 22:49:06.629 INFO [stderr] 
Dec 17 22:49:06.629 INFO [stderr] warning: unused import: `std::fs::File`
Dec 17 22:49:06.629 INFO [stderr]  --> src/main.rs:8:5
Dec 17 22:49:06.629 INFO [stderr]   |
Dec 17 22:49:06.629 INFO [stderr] 8 | use std::fs::File;
Dec 17 22:49:06.629 INFO [stderr]   |     ^^^^^^^^^^^^^
Dec 17 22:49:06.629 INFO [stderr] 
Dec 17 22:49:06.681 INFO [stderr] warning: the feature `fs_read_write` has been stable since 1.26.0 and no longer requires an attribute to enable
Dec 17 22:49:06.681 INFO [stderr]  --> src/main.rs:1:12
Dec 17 22:49:06.681 INFO [stderr]   |
Dec 17 22:49:06.681 INFO [stderr] 1 | #![feature(fs_read_write)]
Dec 17 22:49:06.681 INFO [stderr]   |            ^^^^^^^^^^^^^
Dec 17 22:49:06.681 INFO [stderr]   |
Dec 17 22:49:06.688 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 17 22:49:06.688 INFO [stderr] 
Dec 17 22:49:06.709 INFO [stderr] warning: the feature `fs_read_write` has been stable since 1.26.0 and no longer requires an attribute to enable
Dec 17 22:49:06.709 INFO [stderr]  --> src/main.rs:1:12
Dec 17 22:49:06.709 INFO [stderr]   |
Dec 17 22:49:06.709 INFO [stderr] 1 | #![feature(fs_read_write)]
Dec 17 22:49:06.709 INFO [stderr]   |            ^^^^^^^^^^^^^
Dec 17 22:49:06.709 INFO [stderr]   |
Dec 17 22:49:06.709 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 17 22:49:06.709 INFO [stderr] 
Dec 17 22:49:06.731 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.33s
Dec 17 22:49:07.038 INFO running `"docker" "inspect" "3503bf76ca62beec5076d054c2eaa3f427aec3784ec3728278d3328fc0a7f2bd"`
Dec 17 22:49:07.096 INFO running `"docker" "rm" "-f" "3503bf76ca62beec5076d054c2eaa3f427aec3784ec3728278d3328fc0a7f2bd"`
Dec 17 22:49:07.202 INFO [stdout] 3503bf76ca62beec5076d054c2eaa3f427aec3784ec3728278d3328fc0a7f2bd