[INFO] cloning repository https://github.com/Torrencem/addcomb
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Torrencem/addcomb" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTorrencem%2Faddcomb", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTorrencem%2Faddcomb'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3ffaa2059ae21c56efd519ae013f3a30db662409
[INFO] checking Torrencem/addcomb against master#a609fb45efad59dfd459c76e50899be9f0583b5a for pr-80579
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTorrencem%2Faddcomb" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Torrencem/addcomb on toolchain a609fb45efad59dfd459c76e50899be9f0583b5a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-9/source/.cargo/config
[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 /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/Torrencem/addcomb already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 49d696d45d8a78d488482fedf115a998255dbb1672591d490371144c0f66795b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "49d696d45d8a78d488482fedf115a998255dbb1672591d490371144c0f66795b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "49d696d45d8a78d488482fedf115a998255dbb1672591d490371144c0f66795b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "49d696d45d8a78d488482fedf115a998255dbb1672591d490371144c0f66795b", kill_on_drop: false }`
[INFO] [stdout] 49d696d45d8a78d488482fedf115a998255dbb1672591d490371144c0f66795b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cf91faaf7fd3fddf265aa5a87e6cc9ee2c8205bd67b23653b5c8906923326028
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "cf91faaf7fd3fddf265aa5a87e6cc9ee2c8205bd67b23653b5c8906923326028", kill_on_drop: false }`
[INFO] [stderr]     Checking rand_core v0.4.0
[INFO] [stderr]    Compiling autocfg v0.1.2
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling libc v0.2.48
[INFO] [stderr]     Checking addcomb v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `comb::chapter_a::*`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use comb::chapter_a::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `comb::chapter_b::*`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use comb::chapter_b::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `comb::chapter_c::*`
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use comb::chapter_c::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `comb::chapter_d::*`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use comb::chapter_d::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `comb::chapter_e::*`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use comb::chapter_e::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `comb::chapter_f::*`
[INFO] [stdout]  --> src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use comb::chapter_f::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `comb::chapter_g::*`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use comb::chapter_g::*;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking rand_jitter v0.1.3
[INFO] [stdout] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_a/mod.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let mut greatest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]    = note: consider using `_greatest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `greatest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_a/mod.rs:23:13
[INFO] [stdout]    |
[INFO] [stdout] 23 |             greatest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_a/mod.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let mut greatest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_greatest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `greatest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_a/mod.rs:43:13
[INFO] [stdout]    |
[INFO] [stdout] 43 |             greatest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_a/mod.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |     let mut greatest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_greatest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `greatest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_a/mod.rs:63:13
[INFO] [stdout]    |
[INFO] [stdout] 63 |             greatest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_a/mod.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let mut greatest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_greatest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `greatest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_a/mod.rs:83:13
[INFO] [stdout]    |
[INFO] [stdout] 83 |             greatest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_a/mod.rs:93:9
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let mut greatest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_greatest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `greatest_set` is never read
[INFO] [stdout]    --> src/comb/chapter_a/mod.rs:103:13
[INFO] [stdout]     |
[INFO] [stdout] 103 |             greatest_set = a;
[INFO] [stdout]     |             ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stdout]    --> src/comb/chapter_a/mod.rs:113:9
[INFO] [stdout]     |
[INFO] [stdout] 113 |     let mut greatest_set = empty_set();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_greatest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `greatest_set` is never read
[INFO] [stdout]    --> src/comb/chapter_a/mod.rs:123:13
[INFO] [stdout]     |
[INFO] [stdout] 123 |             greatest_set = a;
[INFO] [stdout]     |             ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stdout]    --> src/comb/chapter_a/mod.rs:133:9
[INFO] [stdout]     |
[INFO] [stdout] 133 |     let mut greatest_set = empty_set();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_greatest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `greatest_set` is never read
[INFO] [stdout]    --> src/comb/chapter_a/mod.rs:143:13
[INFO] [stdout]     |
[INFO] [stdout] 143 |             greatest_set = a;
[INFO] [stdout]     |             ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stdout]    --> src/comb/chapter_a/mod.rs:153:9
[INFO] [stdout]     |
[INFO] [stdout] 153 |     let mut greatest_set = empty_set();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_greatest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `greatest_set` is never read
[INFO] [stdout]    --> src/comb/chapter_a/mod.rs:163:13
[INFO] [stdout]     |
[INFO] [stdout] 163 |             greatest_set = a;
[INFO] [stdout]     |             ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let mut smallest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_smallest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `smallest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |             smallest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let mut smallest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_smallest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `smallest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |             smallest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let mut smallest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_smallest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `smallest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:50:13
[INFO] [stdout]    |
[INFO] [stdout] 50 |             smallest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |     let mut smallest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_smallest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `smallest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:67:13
[INFO] [stdout]    |
[INFO] [stdout] 67 |             smallest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:77:9
[INFO] [stdout]    |
[INFO] [stdout] 77 |     let mut smallest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_smallest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `smallest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:83:13
[INFO] [stdout]    |
[INFO] [stdout] 83 |             smallest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:93:9
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let mut smallest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_smallest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `smallest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:99:13
[INFO] [stdout]    |
[INFO] [stdout] 99 |             smallest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stdout]    --> src/comb/chapter_d/mod.rs:109:9
[INFO] [stdout]     |
[INFO] [stdout] 109 |     let mut smallest_set = empty_set();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_smallest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `smallest_set` is never read
[INFO] [stdout]    --> src/comb/chapter_d/mod.rs:115:13
[INFO] [stdout]     |
[INFO] [stdout] 115 |             smallest_set = a;
[INFO] [stdout]     |             ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stdout]    --> src/comb/chapter_d/mod.rs:125:9
[INFO] [stdout]     |
[INFO] [stdout] 125 |     let mut smallest_set = empty_set();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_smallest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `smallest_set` is never read
[INFO] [stdout]    --> src/comb/chapter_d/mod.rs:131:13
[INFO] [stdout]     |
[INFO] [stdout] 131 |             smallest_set = a;
[INFO] [stdout]     |             ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stdout] warning: 39 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]     Checking rand_os v0.1.2
[INFO] [stderr]    Compiling rand_pcg v0.1.1
[INFO] [stdout] warning: unused import: `comb::chapter_a::*`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use comb::chapter_a::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `comb::chapter_b::*`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use comb::chapter_b::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `comb::chapter_c::*`
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use comb::chapter_c::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `comb::chapter_d::*`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use comb::chapter_d::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `comb::chapter_e::*`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use comb::chapter_e::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `comb::chapter_f::*`
[INFO] [stdout]  --> src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use comb::chapter_f::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `comb::chapter_g::*`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use comb::chapter_g::*;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_a/mod.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let mut greatest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]    = note: consider using `_greatest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `greatest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_a/mod.rs:23:13
[INFO] [stdout]    |
[INFO] [stdout] 23 |             greatest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_a/mod.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let mut greatest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_greatest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `greatest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_a/mod.rs:43:13
[INFO] [stdout]    |
[INFO] [stdout] 43 |             greatest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_a/mod.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |     let mut greatest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_greatest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `greatest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_a/mod.rs:63:13
[INFO] [stdout]    |
[INFO] [stdout] 63 |             greatest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_a/mod.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let mut greatest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_greatest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `greatest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_a/mod.rs:83:13
[INFO] [stdout]    |
[INFO] [stdout] 83 |             greatest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_a/mod.rs:93:9
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let mut greatest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_greatest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `greatest_set` is never read
[INFO] [stdout]    --> src/comb/chapter_a/mod.rs:103:13
[INFO] [stdout]     |
[INFO] [stdout] 103 |             greatest_set = a;
[INFO] [stdout]     |             ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stdout]    --> src/comb/chapter_a/mod.rs:113:9
[INFO] [stdout]     |
[INFO] [stdout] 113 |     let mut greatest_set = empty_set();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_greatest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `greatest_set` is never read
[INFO] [stdout]    --> src/comb/chapter_a/mod.rs:123:13
[INFO] [stdout]     |
[INFO] [stdout] 123 |             greatest_set = a;
[INFO] [stdout]     |             ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stdout]    --> src/comb/chapter_a/mod.rs:133:9
[INFO] [stdout]     |
[INFO] [stdout] 133 |     let mut greatest_set = empty_set();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_greatest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `greatest_set` is never read
[INFO] [stdout]    --> src/comb/chapter_a/mod.rs:143:13
[INFO] [stdout]     |
[INFO] [stdout] 143 |             greatest_set = a;
[INFO] [stdout]     |             ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `greatest_set` is assigned to, but never used
[INFO] [stdout]    --> src/comb/chapter_a/mod.rs:153:9
[INFO] [stdout]     |
[INFO] [stdout] 153 |     let mut greatest_set = empty_set();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_greatest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `greatest_set` is never read
[INFO] [stdout]    --> src/comb/chapter_a/mod.rs:163:13
[INFO] [stdout]     |
[INFO] [stdout] 163 |             greatest_set = a;
[INFO] [stdout]     |             ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let mut smallest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_smallest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `smallest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |             smallest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let mut smallest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_smallest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `smallest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |             smallest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let mut smallest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_smallest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `smallest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:50:13
[INFO] [stdout]    |
[INFO] [stdout] 50 |             smallest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |     let mut smallest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_smallest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `smallest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:67:13
[INFO] [stdout]    |
[INFO] [stdout] 67 |             smallest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:77:9
[INFO] [stdout]    |
[INFO] [stdout] 77 |     let mut smallest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_smallest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `smallest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:83:13
[INFO] [stdout]    |
[INFO] [stdout] 83 |             smallest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:93:9
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let mut smallest_set = empty_set();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_smallest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `smallest_set` is never read
[INFO] [stdout]   --> src/comb/chapter_d/mod.rs:99:13
[INFO] [stdout]    |
[INFO] [stdout] 99 |             smallest_set = a;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stdout]    --> src/comb/chapter_d/mod.rs:109:9
[INFO] [stdout]     |
[INFO] [stdout] 109 |     let mut smallest_set = empty_set();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_smallest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `smallest_set` is never read
[INFO] [stdout]    --> src/comb/chapter_d/mod.rs:115:13
[INFO] [stdout]     |
[INFO] [stdout] 115 |             smallest_set = a;
[INFO] [stdout]     |             ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `smallest_set` is assigned to, but never used
[INFO] [stdout]    --> src/comb/chapter_d/mod.rs:125:9
[INFO] [stdout]     |
[INFO] [stdout] 125 |     let mut smallest_set = empty_set();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_smallest_set` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `smallest_set` is never read
[INFO] [stdout]    --> src/comb/chapter_d/mod.rs:131:13
[INFO] [stdout]     |
[INFO] [stdout] 131 |             smallest_set = a;
[INFO] [stdout]     |             ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 39 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.36s
[INFO] running `Command { std: "docker" "inspect" "cf91faaf7fd3fddf265aa5a87e6cc9ee2c8205bd67b23653b5c8906923326028", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cf91faaf7fd3fddf265aa5a87e6cc9ee2c8205bd67b23653b5c8906923326028", kill_on_drop: false }`
[INFO] [stdout] cf91faaf7fd3fddf265aa5a87e6cc9ee2c8205bd67b23653b5c8906923326028