[INFO] updating cached repository Torrencem/addcomb
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Torrencem/addcomb
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Torrencem/addcomb" "work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/Torrencem/addcomb"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/Torrencem/addcomb'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Torrencem/addcomb" "work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/Torrencem/addcomb"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/Torrencem/addcomb'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3ffaa2059ae21c56efd519ae013f3a30db662409
[INFO] sha for GitHub repo Torrencem/addcomb: 3ffaa2059ae21c56efd519ae013f3a30db662409
[INFO] validating manifest of Torrencem/addcomb on toolchain master#a850a426491e14186af2250549bf41256b5938d2
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Torrencem/addcomb on toolchain try#06a150c7d11500b41499224f165e9de1de096768
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing Torrencem/addcomb
[INFO] finished frobbing Torrencem/addcomb
[INFO] frobbed toml for Torrencem/addcomb written to work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/Torrencem/addcomb/Cargo.toml
[INFO] started frobbing Torrencem/addcomb
[INFO] finished frobbing Torrencem/addcomb
[INFO] frobbed toml for Torrencem/addcomb written to work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/Torrencem/addcomb/Cargo.toml
[INFO] crate Torrencem/addcomb already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking Torrencem/addcomb against master#a850a426491e14186af2250549bf41256b5938d2 for pr-60162
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60162/worker-7/master#a850a426491e14186af2250549bf41256b5938d2:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/Torrencem/addcomb:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/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" "+a850a426491e14186af2250549bf41256b5938d2-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 58235437bb2a94371b780bfc89a680ad3cb85aacb42997428dfe6b9e975cc284
[INFO] running `"docker" "start" "-a" "58235437bb2a94371b780bfc89a680ad3cb85aacb42997428dfe6b9e975cc284"`
[INFO] [stderr]     Checking addcomb v0.2.0 (/opt/crater/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: 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] 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 1.09s
[INFO] running `"docker" "inspect" "58235437bb2a94371b780bfc89a680ad3cb85aacb42997428dfe6b9e975cc284"`
[INFO] running `"docker" "rm" "-f" "58235437bb2a94371b780bfc89a680ad3cb85aacb42997428dfe6b9e975cc284"`
[INFO] [stdout] 58235437bb2a94371b780bfc89a680ad3cb85aacb42997428dfe6b9e975cc284