[INFO] updating cached repository https://github.com/Torrencem/addcomb
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3ffaa2059ae21c56efd519ae013f3a30db662409
[INFO] testing Torrencem/addcomb against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2FTorrencem%2Faddcomb" "work/builds/worker-7/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Torrencem/addcomb on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/Torrencem/addcomb
[INFO] finished tweaking git repo https://github.com/Torrencem/addcomb
[INFO] tweaked toml for git repo https://github.com/Torrencem/addcomb written to work/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/Torrencem/addcomb already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 6df9a8810e4bbeb9e224ed8fe01c2ca7bd100b0ce86fbbc5279e01e60c013cc1
[INFO] running `"docker" "start" "-a" "6df9a8810e4bbeb9e224ed8fe01c2ca7bd100b0ce86fbbc5279e01e60c013cc1"`
[INFO] [stderr]    Compiling addcomb v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `comb::chapter_a::*`
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use comb::chapter_a::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `comb::chapter_b::*`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use comb::chapter_b::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `comb::chapter_c::*`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use comb::chapter_c::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `comb::chapter_d::*`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use comb::chapter_d::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `comb::chapter_e::*`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use comb::chapter_e::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `comb::chapter_f::*`
[INFO] [stderr]  --> src/main.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use comb::chapter_f::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `comb::chapter_g::*`
[INFO] [stderr]   --> src/main.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use comb::chapter_g::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_a/mod.rs:13:13
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let mut greatest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr]    = note: consider using `_greatest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `greatest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_a/mod.rs:23:13
[INFO] [stderr]    |
[INFO] [stderr] 23 |             greatest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_a/mod.rs:33:13
[INFO] [stderr]    |
[INFO] [stderr] 33 |     let mut greatest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_greatest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `greatest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_a/mod.rs:43:13
[INFO] [stderr]    |
[INFO] [stderr] 43 |             greatest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_a/mod.rs:53:13
[INFO] [stderr]    |
[INFO] [stderr] 53 |     let mut greatest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_greatest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `greatest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_a/mod.rs:63:13
[INFO] [stderr]    |
[INFO] [stderr] 63 |             greatest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_a/mod.rs:73:13
[INFO] [stderr]    |
[INFO] [stderr] 73 |     let mut greatest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_greatest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `greatest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_a/mod.rs:83:13
[INFO] [stderr]    |
[INFO] [stderr] 83 |             greatest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_a/mod.rs:93:13
[INFO] [stderr]    |
[INFO] [stderr] 93 |     let mut greatest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_greatest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `greatest_set` is never read
[INFO] [stderr]    --> src/comb/chapter_a/mod.rs:103:13
[INFO] [stderr]     |
[INFO] [stderr] 103 |             greatest_set = a;
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stderr]    --> src/comb/chapter_a/mod.rs:113:13
[INFO] [stderr]     |
[INFO] [stderr] 113 |     let mut greatest_set = empty_set();
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: consider using `_greatest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `greatest_set` is never read
[INFO] [stderr]    --> src/comb/chapter_a/mod.rs:123:13
[INFO] [stderr]     |
[INFO] [stderr] 123 |             greatest_set = a;
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stderr]    --> src/comb/chapter_a/mod.rs:133:13
[INFO] [stderr]     |
[INFO] [stderr] 133 |     let mut greatest_set = empty_set();
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: consider using `_greatest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `greatest_set` is never read
[INFO] [stderr]    --> src/comb/chapter_a/mod.rs:143:13
[INFO] [stderr]     |
[INFO] [stderr] 143 |             greatest_set = a;
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stderr]    --> src/comb/chapter_a/mod.rs:153:13
[INFO] [stderr]     |
[INFO] [stderr] 153 |     let mut greatest_set = empty_set();
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: consider using `_greatest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `greatest_set` is never read
[INFO] [stderr]    --> src/comb/chapter_a/mod.rs:163:13
[INFO] [stderr]     |
[INFO] [stderr] 163 |             greatest_set = a;
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:12:13
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let mut smallest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_smallest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `smallest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:18:13
[INFO] [stderr]    |
[INFO] [stderr] 18 |             smallest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:28:13
[INFO] [stderr]    |
[INFO] [stderr] 28 |     let mut smallest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_smallest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `smallest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:34:13
[INFO] [stderr]    |
[INFO] [stderr] 34 |             smallest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:44:13
[INFO] [stderr]    |
[INFO] [stderr] 44 |     let mut smallest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_smallest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `smallest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:50:13
[INFO] [stderr]    |
[INFO] [stderr] 50 |             smallest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:61:13
[INFO] [stderr]    |
[INFO] [stderr] 61 |     let mut smallest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_smallest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `smallest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:67:13
[INFO] [stderr]    |
[INFO] [stderr] 67 |             smallest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:77:13
[INFO] [stderr]    |
[INFO] [stderr] 77 |     let mut smallest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_smallest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `smallest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:83:13
[INFO] [stderr]    |
[INFO] [stderr] 83 |             smallest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:93:13
[INFO] [stderr]    |
[INFO] [stderr] 93 |     let mut smallest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_smallest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `smallest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:99:13
[INFO] [stderr]    |
[INFO] [stderr] 99 |             smallest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stderr]    --> src/comb/chapter_d/mod.rs:109:13
[INFO] [stderr]     |
[INFO] [stderr] 109 |     let mut smallest_set = empty_set();
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: consider using `_smallest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `smallest_set` is never read
[INFO] [stderr]    --> src/comb/chapter_d/mod.rs:115:13
[INFO] [stderr]     |
[INFO] [stderr] 115 |             smallest_set = a;
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stderr]    --> src/comb/chapter_d/mod.rs:125:13
[INFO] [stderr]     |
[INFO] [stderr] 125 |     let mut smallest_set = empty_set();
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: consider using `_smallest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `smallest_set` is never read
[INFO] [stderr]    --> src/comb/chapter_d/mod.rs:131:13
[INFO] [stderr]     |
[INFO] [stderr] 131 |             smallest_set = a;
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.48s
[INFO] running `"docker" "inspect" "6df9a8810e4bbeb9e224ed8fe01c2ca7bd100b0ce86fbbc5279e01e60c013cc1"`
[INFO] running `"docker" "rm" "-f" "6df9a8810e4bbeb9e224ed8fe01c2ca7bd100b0ce86fbbc5279e01e60c013cc1"`
[INFO] [stdout] 6df9a8810e4bbeb9e224ed8fe01c2ca7bd100b0ce86fbbc5279e01e60c013cc1
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 39e9f78a8f33f5ee6218437111b44f8abb849f8dd44abe9031de5cba7cf4fb88
[INFO] running `"docker" "start" "-a" "39e9f78a8f33f5ee6218437111b44f8abb849f8dd44abe9031de5cba7cf4fb88"`
[INFO] [stderr]    Compiling rand_os v0.1.2
[INFO] [stderr]    Compiling rand_pcg v0.1.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling addcomb v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `comb::chapter_a::*`
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use comb::chapter_a::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `comb::chapter_b::*`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use comb::chapter_b::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `comb::chapter_c::*`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use comb::chapter_c::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `comb::chapter_d::*`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use comb::chapter_d::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `comb::chapter_e::*`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use comb::chapter_e::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `comb::chapter_f::*`
[INFO] [stderr]  --> src/main.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use comb::chapter_f::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `comb::chapter_g::*`
[INFO] [stderr]   --> src/main.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use comb::chapter_g::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_a/mod.rs:13:13
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let mut greatest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr]    = note: consider using `_greatest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `greatest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_a/mod.rs:23:13
[INFO] [stderr]    |
[INFO] [stderr] 23 |             greatest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_a/mod.rs:33:13
[INFO] [stderr]    |
[INFO] [stderr] 33 |     let mut greatest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_greatest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `greatest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_a/mod.rs:43:13
[INFO] [stderr]    |
[INFO] [stderr] 43 |             greatest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_a/mod.rs:53:13
[INFO] [stderr]    |
[INFO] [stderr] 53 |     let mut greatest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_greatest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `greatest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_a/mod.rs:63:13
[INFO] [stderr]    |
[INFO] [stderr] 63 |             greatest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_a/mod.rs:73:13
[INFO] [stderr]    |
[INFO] [stderr] 73 |     let mut greatest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_greatest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `greatest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_a/mod.rs:83:13
[INFO] [stderr]    |
[INFO] [stderr] 83 |             greatest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_a/mod.rs:93:13
[INFO] [stderr]    |
[INFO] [stderr] 93 |     let mut greatest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_greatest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `greatest_set` is never read
[INFO] [stderr]    --> src/comb/chapter_a/mod.rs:103:13
[INFO] [stderr]     |
[INFO] [stderr] 103 |             greatest_set = a;
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stderr]    --> src/comb/chapter_a/mod.rs:113:13
[INFO] [stderr]     |
[INFO] [stderr] 113 |     let mut greatest_set = empty_set();
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: consider using `_greatest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `greatest_set` is never read
[INFO] [stderr]    --> src/comb/chapter_a/mod.rs:123:13
[INFO] [stderr]     |
[INFO] [stderr] 123 |             greatest_set = a;
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stderr]    --> src/comb/chapter_a/mod.rs:133:13
[INFO] [stderr]     |
[INFO] [stderr] 133 |     let mut greatest_set = empty_set();
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: consider using `_greatest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `greatest_set` is never read
[INFO] [stderr]    --> src/comb/chapter_a/mod.rs:143:13
[INFO] [stderr]     |
[INFO] [stderr] 143 |             greatest_set = a;
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stderr]    --> src/comb/chapter_a/mod.rs:153:13
[INFO] [stderr]     |
[INFO] [stderr] 153 |     let mut greatest_set = empty_set();
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: consider using `_greatest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `greatest_set` is never read
[INFO] [stderr]    --> src/comb/chapter_a/mod.rs:163:13
[INFO] [stderr]     |
[INFO] [stderr] 163 |             greatest_set = a;
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:12:13
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let mut smallest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_smallest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `smallest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:18:13
[INFO] [stderr]    |
[INFO] [stderr] 18 |             smallest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:28:13
[INFO] [stderr]    |
[INFO] [stderr] 28 |     let mut smallest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_smallest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `smallest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:34:13
[INFO] [stderr]    |
[INFO] [stderr] 34 |             smallest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:44:13
[INFO] [stderr]    |
[INFO] [stderr] 44 |     let mut smallest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_smallest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `smallest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:50:13
[INFO] [stderr]    |
[INFO] [stderr] 50 |             smallest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:61:13
[INFO] [stderr]    |
[INFO] [stderr] 61 |     let mut smallest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_smallest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `smallest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:67:13
[INFO] [stderr]    |
[INFO] [stderr] 67 |             smallest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:77:13
[INFO] [stderr]    |
[INFO] [stderr] 77 |     let mut smallest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_smallest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `smallest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:83:13
[INFO] [stderr]    |
[INFO] [stderr] 83 |             smallest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:93:13
[INFO] [stderr]    |
[INFO] [stderr] 93 |     let mut smallest_set = empty_set();
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_smallest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `smallest_set` is never read
[INFO] [stderr]   --> src/comb/chapter_d/mod.rs:99:13
[INFO] [stderr]    |
[INFO] [stderr] 99 |             smallest_set = a;
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stderr]    --> src/comb/chapter_d/mod.rs:109:13
[INFO] [stderr]     |
[INFO] [stderr] 109 |     let mut smallest_set = empty_set();
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: consider using `_smallest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `smallest_set` is never read
[INFO] [stderr]    --> src/comb/chapter_d/mod.rs:115:13
[INFO] [stderr]     |
[INFO] [stderr] 115 |             smallest_set = a;
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stderr]    --> src/comb/chapter_d/mod.rs:125:13
[INFO] [stderr]     |
[INFO] [stderr] 125 |     let mut smallest_set = empty_set();
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: consider using `_smallest_set` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `smallest_set` is never read
[INFO] [stderr]    --> src/comb/chapter_d/mod.rs:131:13
[INFO] [stderr]     |
[INFO] [stderr] 131 |             smallest_set = a;
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.98s
[INFO] running `"docker" "inspect" "39e9f78a8f33f5ee6218437111b44f8abb849f8dd44abe9031de5cba7cf4fb88"`
[INFO] running `"docker" "rm" "-f" "39e9f78a8f33f5ee6218437111b44f8abb849f8dd44abe9031de5cba7cf4fb88"`
[INFO] [stdout] 39e9f78a8f33f5ee6218437111b44f8abb849f8dd44abe9031de5cba7cf4fb88
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "test" "--frozen"`
[INFO] [stdout] 8a45ebdeeda302241bc22afa11345a5cf1ff1f757dce0e2a022bb914806ff51a
[INFO] running `"docker" "start" "-a" "8a45ebdeeda302241bc22afa11345a5cf1ff1f757dce0e2a022bb914806ff51a"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.15s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/addcomb-812ccd5288569b9f
[INFO] [stdout] 
[INFO] [stdout] running 12 tests
[INFO] [stdout] test comb::chapter_b::tests::test_phi_restricted_interval ... ok
[INFO] [stdout] test comb::chapter_a::tests::test_nu_interval ... ok
[INFO] [stdout] test comb::chapter_c::tests::test_sigma ... ok
[INFO] [stdout] test comb::hfolds::tests::test_hfrs ... ok
[INFO] [stdout] test comb::hfolds::tests::test_intervals ... ok
[INFO] [stdout] test fastset::tests::test_each_exact ... ok
[INFO] [stdout] test comb::tests::test_c_a ... ok
[INFO] [stdout] test fastset::tests::test_set_correctness ... ok
[INFO] [stdout] test comb::chapter_b::tests::test_phi_interval ... ok
[INFO] [stdout] test comb::chapter_g::tests::test_mu_res ... ok
[INFO] [stdout] test comb::tests::test_dylans_thing ... ok
[INFO] [stdout] test comb::chapter_f::tests::test_tau_restricted ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 12 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "8a45ebdeeda302241bc22afa11345a5cf1ff1f757dce0e2a022bb914806ff51a"`
[INFO] running `"docker" "rm" "-f" "8a45ebdeeda302241bc22afa11345a5cf1ff1f757dce0e2a022bb914806ff51a"`
[INFO] [stdout] 8a45ebdeeda302241bc22afa11345a5cf1ff1f757dce0e2a022bb914806ff51a