Dec 19 08:10:01.756 INFO checking stephen-lazaro/reuler against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 08:10:01.756 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-1/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/stephen-lazaro/reuler:/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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 08:10:02.172 INFO [stdout] 30671432fdc0a39b228ac11504446f4bf37e1041547b9aad1dc87192d32d0c0d
Dec 19 08:10:02.174 INFO running `"docker" "start" "-a" "30671432fdc0a39b228ac11504446f4bf37e1041547b9aad1dc87192d32d0c0d"`
Dec 19 08:10:03.952 INFO [stderr]     Checking memchr v0.1.11
Dec 19 08:10:03.952 INFO [stderr]     Checking rand v0.3.15
Dec 19 08:10:03.952 INFO [stderr]     Checking itertools v0.7.3
Dec 19 08:10:03.972 INFO [stderr]     Checking thread-id v2.0.0
Dec 19 08:10:04.604 INFO [stderr]     Checking thread_local v0.2.7
Dec 19 08:10:04.836 INFO [stderr]     Checking aho-corasick v0.5.3
Dec 19 08:10:05.904 INFO [stderr]     Checking regex v0.1.80
Dec 19 08:10:08.140 INFO [stderr]     Checking reuler v0.1.0 (/opt/crater/workdir)
Dec 19 08:10:08.364 INFO [stderr] warning: unknown lint: `unused_import`
Dec 19 08:10:08.364 INFO [stderr]  --> src/lib.rs:5:9
Dec 19 08:10:08.364 INFO [stderr]   |
Dec 19 08:10:08.364 INFO [stderr] 5 | #[allow(unused_import)]
Dec 19 08:10:08.364 INFO [stderr]   |         ^^^^^^^^^^^^^
Dec 19 08:10:08.364 INFO [stderr]   |
Dec 19 08:10:08.364 INFO [stderr]   = note: #[warn(unknown_lints)] on by default
Dec 19 08:10:08.364 INFO [stderr] 
Dec 19 08:10:08.548 INFO [stderr] warning: unused `#[macro_use]` import
Dec 19 08:10:08.548 INFO [stderr]  --> src/lib.rs:3:1
Dec 19 08:10:08.549 INFO [stderr]   |
Dec 19 08:10:08.549 INFO [stderr] 3 | #[macro_use] extern crate itertools;
Dec 19 08:10:08.549 INFO [stderr]   | ^^^^^^^^^^^^
Dec 19 08:10:08.549 INFO [stderr]   |
Dec 19 08:10:08.549 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 08:10:08.549 INFO [stderr] 
Dec 19 08:10:08.832 INFO [stderr] warning: value assigned to `triangular_num` is never read
Dec 19 08:10:08.832 INFO [stderr]  --> src/eulers/twelve.rs:6:13
Dec 19 08:10:08.832 INFO [stderr]   |
Dec 19 08:10:08.832 INFO [stderr] 6 |     let mut triangular_num = Some(6);
Dec 19 08:10:08.832 INFO [stderr]   |             ^^^^^^^^^^^^^^
Dec 19 08:10:08.832 INFO [stderr]   |
Dec 19 08:10:08.832 INFO [stderr]   = note: #[warn(unused_assignments)] on by default
Dec 19 08:10:08.832 INFO [stderr]   = help: maybe it is overwritten before being read?
Dec 19 08:10:08.832 INFO [stderr] 
Dec 19 08:10:08.900 INFO [stderr] warning: the feature `inclusive_range_syntax` has been stable since 1.26.0 and no longer requires an attribute to enable
Dec 19 08:10:08.900 INFO [stderr]  --> src/lib.rs:1:12
Dec 19 08:10:08.900 INFO [stderr]   |
Dec 19 08:10:08.900 INFO [stderr] 1 | #![feature(inclusive_range_syntax)]
Dec 19 08:10:08.900 INFO [stderr]   |            ^^^^^^^^^^^^^^^^^^^^^^
Dec 19 08:10:08.900 INFO [stderr]   |
Dec 19 08:10:08.900 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 19 08:10:08.900 INFO [stderr] 
Dec 19 08:10:08.900 INFO [stderr] warning: the feature `iterator_step_by` has been stable since 1.28.0 and no longer requires an attribute to enable
Dec 19 08:10:08.900 INFO [stderr]  --> src/lib.rs:2:12
Dec 19 08:10:08.900 INFO [stderr]   |
Dec 19 08:10:08.900 INFO [stderr] 2 | #![feature(iterator_step_by)]
Dec 19 08:10:08.900 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 19 08:10:08.900 INFO [stderr] 
Dec 19 08:10:09.056 INFO [stderr] warning: unknown lint: `unused_import`
Dec 19 08:10:09.056 INFO [stderr]  --> src/main.rs:5:9
Dec 19 08:10:09.056 INFO [stderr]   |
Dec 19 08:10:09.056 INFO [stderr] 5 | #[allow(unused_import)]
Dec 19 08:10:09.056 INFO [stderr]   |         ^^^^^^^^^^^^^
Dec 19 08:10:09.056 INFO [stderr]   |
Dec 19 08:10:09.056 INFO [stderr]   = note: #[warn(unknown_lints)] on by default
Dec 19 08:10:09.056 INFO [stderr] 
Dec 19 08:10:09.164 INFO [stderr] warning: unused `#[macro_use]` import
Dec 19 08:10:09.164 INFO [stderr]  --> src/main.rs:3:1
Dec 19 08:10:09.164 INFO [stderr]   |
Dec 19 08:10:09.164 INFO [stderr] 3 | #[macro_use] extern crate itertools;
Dec 19 08:10:09.164 INFO [stderr]   | ^^^^^^^^^^^^
Dec 19 08:10:09.164 INFO [stderr]   |
Dec 19 08:10:09.164 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 08:10:09.164 INFO [stderr] 
Dec 19 08:10:09.348 INFO [stderr] warning: value assigned to `triangular_num` is never read
Dec 19 08:10:09.348 INFO [stderr]  --> src/eulers/twelve.rs:6:13
Dec 19 08:10:09.348 INFO [stderr]   |
Dec 19 08:10:09.348 INFO [stderr] 6 |     let mut triangular_num = Some(6);
Dec 19 08:10:09.348 INFO [stderr]   |             ^^^^^^^^^^^^^^
Dec 19 08:10:09.348 INFO [stderr]   |
Dec 19 08:10:09.348 INFO [stderr]   = note: #[warn(unused_assignments)] on by default
Dec 19 08:10:09.348 INFO [stderr]   = help: maybe it is overwritten before being read?
Dec 19 08:10:09.348 INFO [stderr] 
Dec 19 08:10:09.420 INFO [stderr] warning: the feature `inclusive_range_syntax` has been stable since 1.26.0 and no longer requires an attribute to enable
Dec 19 08:10:09.420 INFO [stderr]  --> src/main.rs:1:12
Dec 19 08:10:09.420 INFO [stderr]   |
Dec 19 08:10:09.420 INFO [stderr] 1 | #![feature(inclusive_range_syntax)]
Dec 19 08:10:09.420 INFO [stderr]   |            ^^^^^^^^^^^^^^^^^^^^^^
Dec 19 08:10:09.420 INFO [stderr]   |
Dec 19 08:10:09.420 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 19 08:10:09.420 INFO [stderr] 
Dec 19 08:10:09.420 INFO [stderr] warning: the feature `iterator_step_by` has been stable since 1.28.0 and no longer requires an attribute to enable
Dec 19 08:10:09.420 INFO [stderr]  --> src/main.rs:2:12
Dec 19 08:10:09.420 INFO [stderr]   |
Dec 19 08:10:09.420 INFO [stderr] 2 | #![feature(iterator_step_by)]
Dec 19 08:10:09.420 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 19 08:10:09.420 INFO [stderr] 
Dec 19 08:10:09.744 INFO [stderr]     Checking env_logger v0.3.5
Dec 19 08:10:10.196 INFO [stderr]     Checking quickcheck v0.3.2
Dec 19 08:10:11.496 INFO [stderr] warning: unknown lint: `unused_import`
Dec 19 08:10:11.496 INFO [stderr]  --> src/lib.rs:5:9
Dec 19 08:10:11.496 INFO [stderr]   |
Dec 19 08:10:11.496 INFO [stderr] 5 | #[allow(unused_import)]
Dec 19 08:10:11.496 INFO [stderr]   |         ^^^^^^^^^^^^^
Dec 19 08:10:11.496 INFO [stderr]   |
Dec 19 08:10:11.496 INFO [stderr]   = note: #[warn(unknown_lints)] on by default
Dec 19 08:10:11.496 INFO [stderr] 
Dec 19 08:10:11.602 INFO [stderr] warning: unknown lint: `unused_import`
Dec 19 08:10:11.602 INFO [stderr]  --> src/main.rs:5:9
Dec 19 08:10:11.603 INFO [stderr]   |
Dec 19 08:10:11.603 INFO [stderr] 5 | #[allow(unused_import)]
Dec 19 08:10:11.603 INFO [stderr]   |         ^^^^^^^^^^^^^
Dec 19 08:10:11.603 INFO [stderr]   |
Dec 19 08:10:11.603 INFO [stderr]   = note: #[warn(unknown_lints)] on by default
Dec 19 08:10:11.603 INFO [stderr] 
Dec 19 08:10:11.644 INFO [stderr] warning: unused `#[macro_use]` import
Dec 19 08:10:11.644 INFO [stderr]  --> src/lib.rs:3:1
Dec 19 08:10:11.644 INFO [stderr]   |
Dec 19 08:10:11.644 INFO [stderr] 3 | #[macro_use] extern crate itertools;
Dec 19 08:10:11.644 INFO [stderr]   | ^^^^^^^^^^^^
Dec 19 08:10:11.644 INFO [stderr]   |
Dec 19 08:10:11.644 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 08:10:11.644 INFO [stderr] 
Dec 19 08:10:11.720 INFO [stderr] warning: unused `#[macro_use]` import
Dec 19 08:10:11.720 INFO [stderr]  --> src/main.rs:3:1
Dec 19 08:10:11.720 INFO [stderr]   |
Dec 19 08:10:11.720 INFO [stderr] 3 | #[macro_use] extern crate itertools;
Dec 19 08:10:11.720 INFO [stderr]   | ^^^^^^^^^^^^
Dec 19 08:10:11.720 INFO [stderr]   |
Dec 19 08:10:11.720 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 08:10:11.720 INFO [stderr] 
Dec 19 08:10:11.916 INFO [stderr] warning: value assigned to `triangular_num` is never read
Dec 19 08:10:11.916 INFO [stderr]  --> src/eulers/twelve.rs:6:13
Dec 19 08:10:11.916 INFO [stderr]   |
Dec 19 08:10:11.916 INFO [stderr] 6 |     let mut triangular_num = Some(6);
Dec 19 08:10:11.916 INFO [stderr]   |             ^^^^^^^^^^^^^^
Dec 19 08:10:11.916 INFO [stderr]   |
Dec 19 08:10:11.916 INFO [stderr]   = note: #[warn(unused_assignments)] on by default
Dec 19 08:10:11.916 INFO [stderr]   = help: maybe it is overwritten before being read?
Dec 19 08:10:11.916 INFO [stderr] 
Dec 19 08:10:11.924 INFO [stderr] warning: value assigned to `triangular_num` is never read
Dec 19 08:10:11.924 INFO [stderr]  --> src/eulers/twelve.rs:6:13
Dec 19 08:10:11.924 INFO [stderr]   |
Dec 19 08:10:11.924 INFO [stderr] 6 |     let mut triangular_num = Some(6);
Dec 19 08:10:11.924 INFO [stderr]   |             ^^^^^^^^^^^^^^
Dec 19 08:10:11.924 INFO [stderr]   |
Dec 19 08:10:11.924 INFO [stderr]   = note: #[warn(unused_assignments)] on by default
Dec 19 08:10:11.924 INFO [stderr]   = help: maybe it is overwritten before being read?
Dec 19 08:10:11.924 INFO [stderr] 
Dec 19 08:10:11.975 INFO [stderr] warning: the feature `inclusive_range_syntax` has been stable since 1.26.0 and no longer requires an attribute to enable
Dec 19 08:10:11.975 INFO [stderr]  --> src/main.rs:1:12
Dec 19 08:10:11.975 INFO [stderr]   |
Dec 19 08:10:11.975 INFO [stderr] 1 | #![feature(inclusive_range_syntax)]
Dec 19 08:10:11.975 INFO [stderr]   |            ^^^^^^^^^^^^^^^^^^^^^^
Dec 19 08:10:11.975 INFO [stderr]   |
Dec 19 08:10:11.975 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 19 08:10:11.975 INFO [stderr] 
Dec 19 08:10:11.975 INFO [stderr] warning: the feature `iterator_step_by` has been stable since 1.28.0 and no longer requires an attribute to enable
Dec 19 08:10:11.975 INFO [stderr]  --> src/main.rs:2:12
Dec 19 08:10:11.975 INFO [stderr]   |
Dec 19 08:10:11.975 INFO [stderr] 2 | #![feature(iterator_step_by)]
Dec 19 08:10:11.975 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 19 08:10:11.976 INFO [stderr] 
Dec 19 08:10:12.033 INFO [stderr] warning: struct is never constructed: `Valid`
Dec 19 08:10:12.033 INFO [stderr]   --> src/lib.rs:15:5
Dec 19 08:10:12.033 INFO [stderr]    |
Dec 19 08:10:12.033 INFO [stderr] 15 |     pub struct Valid <A : Testable> (A);
Dec 19 08:10:12.033 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 08:10:12.033 INFO [stderr]    |
Dec 19 08:10:12.033 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 19 08:10:12.033 INFO [stderr] 
Dec 19 08:10:12.033 INFO [stderr] warning: struct is never constructed: `Invalid`
Dec 19 08:10:12.033 INFO [stderr]   --> src/lib.rs:16:5
Dec 19 08:10:12.033 INFO [stderr]    |
Dec 19 08:10:12.033 INFO [stderr] 16 |     pub struct Invalid <A : Testable> (A);
Dec 19 08:10:12.033 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 08:10:12.033 INFO [stderr] 
Dec 19 08:10:12.033 INFO [stderr] warning: the feature `inclusive_range_syntax` has been stable since 1.26.0 and no longer requires an attribute to enable
Dec 19 08:10:12.033 INFO [stderr]  --> src/lib.rs:1:12
Dec 19 08:10:12.033 INFO [stderr]   |
Dec 19 08:10:12.033 INFO [stderr] 1 | #![feature(inclusive_range_syntax)]
Dec 19 08:10:12.033 INFO [stderr]   |            ^^^^^^^^^^^^^^^^^^^^^^
Dec 19 08:10:12.033 INFO [stderr]   |
Dec 19 08:10:12.033 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 19 08:10:12.033 INFO [stderr] 
Dec 19 08:10:12.038 INFO [stderr] warning: the feature `iterator_step_by` has been stable since 1.28.0 and no longer requires an attribute to enable
Dec 19 08:10:12.038 INFO [stderr]  --> src/lib.rs:2:12
Dec 19 08:10:12.038 INFO [stderr]   |
Dec 19 08:10:12.038 INFO [stderr] 2 | #![feature(iterator_step_by)]
Dec 19 08:10:12.038 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 19 08:10:12.038 INFO [stderr] 
Dec 19 08:10:12.086 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.21s
Dec 19 08:10:12.638 INFO running `"docker" "inspect" "30671432fdc0a39b228ac11504446f4bf37e1041547b9aad1dc87192d32d0c0d"`
Dec 19 08:10:12.918 INFO running `"docker" "rm" "-f" "30671432fdc0a39b228ac11504446f4bf37e1041547b9aad1dc87192d32d0c0d"`
Dec 19 08:10:13.252 INFO [stdout] 30671432fdc0a39b228ac11504446f4bf37e1041547b9aad1dc87192d32d0c0d