[INFO] updating cached repository 23prime/completion-judgment
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/23prime/completion-judgment
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/23prime/completion-judgment" "work/ex/clippy-test-run/sources/stable/gh/23prime/completion-judgment"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/23prime/completion-judgment'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/23prime/completion-judgment" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/23prime/completion-judgment"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/23prime/completion-judgment'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ce153eb945eb5bbfaff614494854900926cf05d8
[INFO] sha for GitHub repo 23prime/completion-judgment: ce153eb945eb5bbfaff614494854900926cf05d8
[INFO] validating manifest of 23prime/completion-judgment on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of 23prime/completion-judgment on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing 23prime/completion-judgment
[INFO] finished frobbing 23prime/completion-judgment
[INFO] frobbed toml for 23prime/completion-judgment written to work/ex/clippy-test-run/sources/stable/gh/23prime/completion-judgment/Cargo.toml
[INFO] started frobbing 23prime/completion-judgment
[INFO] finished frobbing 23prime/completion-judgment
[INFO] frobbed toml for 23prime/completion-judgment written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/23prime/completion-judgment/Cargo.toml
[INFO] crate 23prime/completion-judgment has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] linting 23prime/completion-judgment against stable+rustflags=-Dclippy::into_iter_on_array for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-6/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/23prime/completion-judgment:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Dclippy::into_iter_on_array" "-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" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 69725ebbc97c5190cc1d7f430e5fc9efe6a28530355e5e77138dc39d0dbe72a8
[INFO] running `"docker" "start" "-a" "69725ebbc97c5190cc1d7f430e5fc9efe6a28530355e5e77138dc39d0dbe72a8"`
[INFO] [stderr]     Checking completion-judgment v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/csv.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     return csv;
[INFO] [stderr]    |     ^^^^^^^^^^^ help: remove `return` as shown: `csv`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/csv.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     return s;
[INFO] [stderr]    |     ^^^^^^^^^ help: remove `return` as shown: `s`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     return req;
[INFO] [stderr]    |     ^^^^^^^^^^^ help: remove `return` as shown: `req`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:28:9
[INFO] [stderr]    |
[INFO] [stderr] 28 |         return "その他".to_string();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `"その他".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:30:10
[INFO] [stderr]    |
[INFO] [stderr] 30 |          return "基礎科目".to_string();
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `"基礎科目".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:32:10
[INFO] [stderr]    |
[INFO] [stderr] 32 |          return "専攻共通 必修".to_string();
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `"専攻共通 必修".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:34:10
[INFO] [stderr]    |
[INFO] [stderr] 34 |          return "専攻共通 選択".to_string();
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `"専攻共通 選択".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:36:10
[INFO] [stderr]    |
[INFO] [stderr] 36 |          return "その他".to_string();
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `"その他".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:38:10
[INFO] [stderr]    |
[INFO] [stderr] 38 |          return "教科教育（数学教育）".to_string();
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `"教科教育（数学教育）".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:40:10
[INFO] [stderr]    |
[INFO] [stderr] 40 |          return "教科選択（研究）".to_string();
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `"教科選択（研究）".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:42:9
[INFO] [stderr]    |
[INFO] [stderr] 42 |         return "教科専門（数学）".to_string();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `"教科専門（数学）".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:52:20
[INFO] [stderr]    |
[INFO] [stderr] 52 |         Some(i) => return i,
[INFO] [stderr]    |                    ^^^^^^^^ help: remove `return` as shown: `i`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:62:5
[INFO] [stderr]    |
[INFO] [stderr] 62 | /     return Credit {
[INFO] [stderr] 63 | |         code:  cd.to_string(),
[INFO] [stderr] 64 | |         title: title.to_string(),
[INFO] [stderr] 65 | |         num:   ds[find_term_index("単位数", &ss)].parse().unwrap(),
[INFO] [stderr] 66 | |         grade: grade.to_string(),
[INFO] [stderr] 67 | |         group: mk_group(cd)
[INFO] [stderr] 68 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] help: remove `return` as shown
[INFO] [stderr]    |
[INFO] [stderr] 62 |     Credit {
[INFO] [stderr] 63 |         code:  cd.to_string(),
[INFO] [stderr] 64 |         title: title.to_string(),
[INFO] [stderr] 65 |         num:   ds[find_term_index("単位数", &ss)].parse().unwrap(),
[INFO] [stderr] 66 |         grade: grade.to_string(),
[INFO] [stderr] 67 |         group: mk_group(cd)
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded unit return type
[INFO] [stderr]   --> src/main.rs:61:49
[INFO] [stderr]    |
[INFO] [stderr] 61 | fn print_group_num(grp: &Group, cdn: CreditNum) -> () {
[INFO] [stderr]    |                                                 ^^^^^ help: remove the `-> ()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::unused_unit)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_unit
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded unit return type
[INFO] [stderr]   --> src/main.rs:65:49
[INFO] [stderr]    |
[INFO] [stderr] 65 | fn print_group_num2(cds: &Credits, grp: &Group) -> () {
[INFO] [stderr]    |                                                 ^^^^^ help: remove the `-> ()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_unit
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/main.rs:80:5
[INFO] [stderr]    |
[INFO] [stderr] 80 |     return cds;
[INFO] [stderr]    |     ^^^^^^^^^^^ help: remove `return` as shown: `cds`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/main.rs:96:5
[INFO] [stderr]    |
[INFO] [stderr] 96 |     return eval;
[INFO] [stderr]    |     ^^^^^^^^^^^^ help: remove `return` as shown: `eval`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:101:9
[INFO] [stderr]     |
[INFO] [stderr] 101 |         return cd.num;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^ help: remove `return` as shown: `cd.num`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:103:9
[INFO] [stderr]     |
[INFO] [stderr] 103 |         return 0.0;
[INFO] [stderr]     |         ^^^^^^^^^^^ help: remove `return` as shown: `0.0`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:112:5
[INFO] [stderr]     |
[INFO] [stderr] 112 |     return cdn;
[INFO] [stderr]     |     ^^^^^^^^^^^ help: remove `return` as shown: `cdn`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:119:5
[INFO] [stderr]     |
[INFO] [stderr] 119 |     return cds;
[INFO] [stderr]     |     ^^^^^^^^^^^ help: remove `return` as shown: `cds`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:129:5
[INFO] [stderr]     |
[INFO] [stderr] 129 |     return (grp, req_num - num);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(grp, req_num - num)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:138:5
[INFO] [stderr]     |
[INFO] [stderr] 138 |     return grps;
[INFO] [stderr]     |     ^^^^^^^^^^^^ help: remove `return` as shown: `grps`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:146:9
[INFO] [stderr]     |
[INFO] [stderr] 146 |         return (grp, false,  diff);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(grp, false,  diff)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:148:9
[INFO] [stderr]     |
[INFO] [stderr] 148 |         return (grp, true,  diff);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(grp, true,  diff)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:160:5
[INFO] [stderr]     |
[INFO] [stderr] 160 |     return jdgs;
[INFO] [stderr]     |     ^^^^^^^^^^^^ help: remove `return` as shown: `jdgs`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:171:5
[INFO] [stderr]     |
[INFO] [stderr] 171 |     return jdg;
[INFO] [stderr]     |     ^^^^^^^^^^^ help: remove `return` as shown: `jdg`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:182:5
[INFO] [stderr]     |
[INFO] [stderr] 182 |     return "結果: ".to_string() + rlt;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `"結果: ".to_string() + rlt`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:192:5
[INFO] [stderr]     |
[INFO] [stderr] 192 |     return gcs;
[INFO] [stderr]     |     ^^^^^^^^^^^ help: remove `return` as shown: `gcs`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/csv.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     return csv;
[INFO] [stderr]    |     ^^^^^^^^^^^ help: remove `return` as shown: `csv`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/csv.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     return s;
[INFO] [stderr]    |     ^^^^^^^^^ help: remove `return` as shown: `s`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     return req;
[INFO] [stderr]    |     ^^^^^^^^^^^ help: remove `return` as shown: `req`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:28:9
[INFO] [stderr]    |
[INFO] [stderr] 28 |         return "その他".to_string();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `"その他".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:30:10
[INFO] [stderr]    |
[INFO] [stderr] 30 |          return "基礎科目".to_string();
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `"基礎科目".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:32:10
[INFO] [stderr]    |
[INFO] [stderr] 32 |          return "専攻共通 必修".to_string();
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `"専攻共通 必修".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:34:10
[INFO] [stderr]    |
[INFO] [stderr] 34 |          return "専攻共通 選択".to_string();
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `"専攻共通 選択".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:36:10
[INFO] [stderr]    |
[INFO] [stderr] 36 |          return "その他".to_string();
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `"その他".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:38:10
[INFO] [stderr]    |
[INFO] [stderr] 38 |          return "教科教育（数学教育）".to_string();
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `"教科教育（数学教育）".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:40:10
[INFO] [stderr]    |
[INFO] [stderr] 40 |          return "教科選択（研究）".to_string();
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `"教科選択（研究）".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:42:9
[INFO] [stderr]    |
[INFO] [stderr] 42 |         return "教科専門（数学）".to_string();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `"教科専門（数学）".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:52:20
[INFO] [stderr]    |
[INFO] [stderr] 52 |         Some(i) => return i,
[INFO] [stderr]    |                    ^^^^^^^^ help: remove `return` as shown: `i`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/rules.rs:62:5
[INFO] [stderr]    |
[INFO] [stderr] 62 | /     return Credit {
[INFO] [stderr] 63 | |         code:  cd.to_string(),
[INFO] [stderr] 64 | |         title: title.to_string(),
[INFO] [stderr] 65 | |         num:   ds[find_term_index("単位数", &ss)].parse().unwrap(),
[INFO] [stderr] 66 | |         grade: grade.to_string(),
[INFO] [stderr] 67 | |         group: mk_group(cd)
[INFO] [stderr] 68 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] help: remove `return` as shown
[INFO] [stderr]    |
[INFO] [stderr] 62 |     Credit {
[INFO] [stderr] 63 |         code:  cd.to_string(),
[INFO] [stderr] 64 |         title: title.to_string(),
[INFO] [stderr] 65 |         num:   ds[find_term_index("単位数", &ss)].parse().unwrap(),
[INFO] [stderr] 66 |         grade: grade.to_string(),
[INFO] [stderr] 67 |         group: mk_group(cd)
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded unit return type
[INFO] [stderr]   --> src/main.rs:61:49
[INFO] [stderr]    |
[INFO] [stderr] 61 | fn print_group_num(grp: &Group, cdn: CreditNum) -> () {
[INFO] [stderr]    |                                                 ^^^^^ help: remove the `-> ()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::unused_unit)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_unit
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded unit return type
[INFO] [stderr]   --> src/main.rs:65:49
[INFO] [stderr]    |
[INFO] [stderr] 65 | fn print_group_num2(cds: &Credits, grp: &Group) -> () {
[INFO] [stderr]    |                                                 ^^^^^ help: remove the `-> ()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_unit
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/main.rs:80:5
[INFO] [stderr]    |
[INFO] [stderr] 80 |     return cds;
[INFO] [stderr]    |     ^^^^^^^^^^^ help: remove `return` as shown: `cds`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/main.rs:96:5
[INFO] [stderr]    |
[INFO] [stderr] 96 |     return eval;
[INFO] [stderr]    |     ^^^^^^^^^^^^ help: remove `return` as shown: `eval`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:101:9
[INFO] [stderr]     |
[INFO] [stderr] 101 |         return cd.num;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^ help: remove `return` as shown: `cd.num`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:103:9
[INFO] [stderr]     |
[INFO] [stderr] 103 |         return 0.0;
[INFO] [stderr]     |         ^^^^^^^^^^^ help: remove `return` as shown: `0.0`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:112:5
[INFO] [stderr]     |
[INFO] [stderr] 112 |     return cdn;
[INFO] [stderr]     |     ^^^^^^^^^^^ help: remove `return` as shown: `cdn`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:119:5
[INFO] [stderr]     |
[INFO] [stderr] 119 |     return cds;
[INFO] [stderr]     |     ^^^^^^^^^^^ help: remove `return` as shown: `cds`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:129:5
[INFO] [stderr]     |
[INFO] [stderr] 129 |     return (grp, req_num - num);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(grp, req_num - num)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:138:5
[INFO] [stderr]     |
[INFO] [stderr] 138 |     return grps;
[INFO] [stderr]     |     ^^^^^^^^^^^^ help: remove `return` as shown: `grps`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:146:9
[INFO] [stderr]     |
[INFO] [stderr] 146 |         return (grp, false,  diff);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(grp, false,  diff)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:148:9
[INFO] [stderr]     |
[INFO] [stderr] 148 |         return (grp, true,  diff);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(grp, true,  diff)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:160:5
[INFO] [stderr]     |
[INFO] [stderr] 160 |     return jdgs;
[INFO] [stderr]     |     ^^^^^^^^^^^^ help: remove `return` as shown: `jdgs`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:171:5
[INFO] [stderr]     |
[INFO] [stderr] 171 |     return jdg;
[INFO] [stderr]     |     ^^^^^^^^^^^ help: remove `return` as shown: `jdg`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:182:5
[INFO] [stderr]     |
[INFO] [stderr] 182 |     return "結果: ".to_string() + rlt;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `"結果: ".to_string() + rlt`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:192:5
[INFO] [stderr]     |
[INFO] [stderr] 192 |     return gcs;
[INFO] [stderr]     |     ^^^^^^^^^^^ help: remove `return` as shown: `gcs`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/rules.rs:21:21
[INFO] [stderr]    |
[INFO] [stderr] 21 | pub fn mk_group(cd: &Code) -> Group {
[INFO] [stderr]    |                     ^^^^^ help: change this to: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/rules.rs:21:21
[INFO] [stderr]    |
[INFO] [stderr] 21 | pub fn mk_group(cd: &Code) -> Group {
[INFO] [stderr]    |                     ^^^^^ help: change this to: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/rules.rs:48:34
[INFO] [stderr]    |
[INFO] [stderr] 48 | fn find_term_index (s: &str, ss: &Vec<String>) -> usize  {
[INFO] [stderr]    |                                  ^^^^^^^^^^^^ help: change this to: `&[String]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: this pattern takes a reference on something that is being de-referenced
[INFO] [stderr]   --> src/rules.rs:49:35
[INFO] [stderr]    |
[INFO] [stderr] 49 |     let idx = ss.iter().position(|&ref ssi| ssi == &s);
[INFO] [stderr]    |                                   ^^^^^^^^ help: try removing the `&ref` part and just keep: `ssi`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_borrowed_reference)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrowed_reference
[INFO] [stderr] 
[INFO] [stderr] warning: taken reference of right operand
[INFO] [stderr]   --> src/rules.rs:49:45
[INFO] [stderr]    |
[INFO] [stderr] 49 |     let idx = ss.iter().position(|&ref ssi| ssi == &s);
[INFO] [stderr]    |                                             ^^^^^^^--
[INFO] [stderr]    |                                                    |
[INFO] [stderr]    |                                                    help: use the right value directly: `s`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::op_ref)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#op_ref
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/rules.rs:57:22
[INFO] [stderr]    |
[INFO] [stderr] 57 | pub fn mk_credit(ss: &Vec<String>, ds: &Vec<String>) -> Credit {
[INFO] [stderr]    |                      ^^^^^^^^^^^^ help: change this to: `&[String]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/rules.rs:57:40
[INFO] [stderr]    |
[INFO] [stderr] 57 | pub fn mk_credit(ss: &Vec<String>, ds: &Vec<String>) -> Credit {
[INFO] [stderr]    |                                        ^^^^^^^^^^^^ help: change this to: `&[String]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/rules.rs:48:34
[INFO] [stderr]    |
[INFO] [stderr] 48 | fn find_term_index (s: &str, ss: &Vec<String>) -> usize  {
[INFO] [stderr]    |                                  ^^^^^^^^^^^^ help: change this to: `&[String]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: this pattern takes a reference on something that is being de-referenced
[INFO] [stderr]   --> src/rules.rs:49:35
[INFO] [stderr]    |
[INFO] [stderr] 49 |     let idx = ss.iter().position(|&ref ssi| ssi == &s);
[INFO] [stderr]    |                                   ^^^^^^^^ help: try removing the `&ref` part and just keep: `ssi`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_borrowed_reference)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrowed_reference
[INFO] [stderr] 
[INFO] [stderr] warning: taken reference of right operand
[INFO] [stderr]   --> src/rules.rs:49:45
[INFO] [stderr]    |
[INFO] [stderr] 49 |     let idx = ss.iter().position(|&ref ssi| ssi == &s);
[INFO] [stderr]    |                                             ^^^^^^^--
[INFO] [stderr]    |                                                    |
[INFO] [stderr]    |                                                    help: use the right value directly: `s`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::op_ref)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#op_ref
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/rules.rs:57:22
[INFO] [stderr]    |
[INFO] [stderr] 57 | pub fn mk_credit(ss: &Vec<String>, ds: &Vec<String>) -> Credit {
[INFO] [stderr]    |                      ^^^^^^^^^^^^ help: change this to: `&[String]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/rules.rs:57:40
[INFO] [stderr]    |
[INFO] [stderr] 57 | pub fn mk_credit(ss: &Vec<String>, ds: &Vec<String>) -> Credit {
[INFO] [stderr]    |                                        ^^^^^^^^^^^^ help: change this to: `&[String]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/main.rs:61:25
[INFO] [stderr]    |
[INFO] [stderr] 61 | fn print_group_num(grp: &Group, cdn: CreditNum) -> () {
[INFO] [stderr]    |                         ^^^^^^ help: change this to: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/main.rs:61:25
[INFO] [stderr]    |
[INFO] [stderr] 61 | fn print_group_num(grp: &Group, cdn: CreditNum) -> () {
[INFO] [stderr]    |                         ^^^^^^ help: change this to: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/main.rs:65:26
[INFO] [stderr]    |
[INFO] [stderr] 65 | fn print_group_num2(cds: &Credits, grp: &Group) -> () {
[INFO] [stderr]    |                          ^^^^^^^^
[INFO] [stderr] 66 |     let fcds  = filter_group(cds.clone(), &grp);
[INFO] [stderr]    |                              ----------- help: change `cds.clone()` to: `cds.to_owned()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/main.rs:65:41
[INFO] [stderr]    |
[INFO] [stderr] 65 | fn print_group_num2(cds: &Credits, grp: &Group) -> () {
[INFO] [stderr]    |                                         ^^^^^^ help: change this to: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/main.rs:65:26
[INFO] [stderr]    |
[INFO] [stderr] 65 | fn print_group_num2(cds: &Credits, grp: &Group) -> () {
[INFO] [stderr]    |                          ^^^^^^^^
[INFO] [stderr] 66 |     let fcds  = filter_group(cds.clone(), &grp);
[INFO] [stderr]    |                              ----------- help: change `cds.clone()` to: `cds.to_owned()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: this pattern takes a reference on something that is being de-referenced
[INFO] [stderr]   --> src/main.rs:74:9
[INFO] [stderr]    |
[INFO] [stderr] 74 |     let &ref terms = &csv[0];
[INFO] [stderr]    |         ^^^^^^^^^^ help: try removing the `&ref` part and just keep: `terms`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrowed_reference
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/main.rs:65:41
[INFO] [stderr]    |
[INFO] [stderr] 65 | fn print_group_num2(cds: &Credits, grp: &Group) -> () {
[INFO] [stderr]    |                                         ^^^^^^ help: change this to: `&str`
[INFO] [stderr] 
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/main.rs:86:22
[INFO] [stderr]    |
[INFO] [stderr] 86 | fn is_available(grd: &Grade) -> bool {
[INFO] [stderr]    |                      ^^^^^^ help: change this to: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/main.rs:107:26
[INFO] [stderr]     |
[INFO] [stderr] 107 | fn count_credit_num(cds: &Credits) -> CreditNum {
[INFO] [stderr]     |                          ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: this pattern takes a reference on something that is being de-referenced
[INFO] [stderr]    --> src/main.rs:109:29
[INFO] [stderr]     |
[INFO] [stderr] 109 |                       .map(|&ref cd| available_credit_num(cd))
[INFO] [stderr]     |                             ^^^^^^^ help: try removing the `&ref` part and just keep: `cd`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrowed_reference
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]    --> src/main.rs:116:40
[INFO] [stderr]     |
[INFO] [stderr] 116 | fn filter_group(mut cds: Credits, grp: &Group) -> Credits {
[INFO] [stderr]     |                                        ^^^^^^ help: change this to: `&str`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: this pattern takes a reference on something that is being de-referenced
[INFO] [stderr]   --> src/main.rs:74:9
[INFO] [stderr]    |
[INFO] [stderr] 74 |     let &ref terms = &csv[0];
[INFO] [stderr]    |         ^^^^^^^^^^ help: try removing the `&ref` part and just keep: `terms`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrowed_reference
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]    --> src/main.rs:124:35
[INFO] [stderr]     |
[INFO] [stderr] 124 | fn difference (cds: Credits, grp: &Group, req: Require) -> (&Group, CreditNum) {
[INFO] [stderr]     |                                   ^^^^^^ help: change this to: `&str`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/main.rs:86:22
[INFO] [stderr]    |
[INFO] [stderr] 86 | fn is_available(grd: &Grade) -> bool {
[INFO] [stderr]    |                      ^^^^^^ help: change this to: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/main.rs:107:26
[INFO] [stderr]     |
[INFO] [stderr] 107 | fn count_credit_num(cds: &Credits) -> CreditNum {
[INFO] [stderr]     |                          ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: this pattern takes a reference on something that is being de-referenced
[INFO] [stderr]    --> src/main.rs:109:29
[INFO] [stderr]     |
[INFO] [stderr] 109 |                       .map(|&ref cd| available_credit_num(cd))
[INFO] [stderr]     |                             ^^^^^^^ help: try removing the `&ref` part and just keep: `cd`
[INFO] [stderr]     |
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/main.rs:154:22
[INFO] [stderr]     |
[INFO] [stderr] 154 | fn judge_groups(cds: &Credits, req: &Require) -> Vec<(Group, bool, CreditNum)> {
[INFO] [stderr]     |                      ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrowed_reference
[INFO] [stderr] 
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]    --> src/main.rs:116:40
[INFO] [stderr]     |
[INFO] [stderr] 116 | fn filter_group(mut cds: Credits, grp: &Group) -> Credits {
[INFO] [stderr]     |                                        ^^^^^^ help: change this to: `&str`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr] warning: this pattern takes a reference on something that is being de-referenced
[INFO] [stderr]    --> src/main.rs:157:26
[INFO] [stderr]     |
[INFO] [stderr] 157 |                    .map(|&ref grp| judge_group(cds.clone(), grp.clone(), req.clone()))
[INFO] [stderr]     |                          ^^^^^^^^ help: try removing the `&ref` part and just keep: `grp`
[INFO] [stderr]    --> src/main.rs:124:35
[INFO] [stderr]     |
[INFO] [stderr] 124 | fn difference (cds: Credits, grp: &Group, req: Require) -> (&Group, CreditNum) {
[INFO] [stderr]     |                                   ^^^^^^ help: change this to: `&str`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrowed_reference
[INFO] [stderr] 
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/main.rs:154:22
[INFO] [stderr]     |
[INFO] [stderr] 154 | fn judge_groups(cds: &Credits, req: &Require) -> Vec<(Group, bool, CreditNum)> {
[INFO] [stderr]     |                      ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: this pattern takes a reference on something that is being de-referenced
[INFO] [stderr]    --> src/main.rs:157:26
[INFO] [stderr]     |
[INFO] [stderr] 157 |                    .map(|&ref grp| judge_group(cds.clone(), grp.clone(), req.clone()))
[INFO] [stderr]     |                          ^^^^^^^^ help: try removing the `&ref` part and just keep: `grp`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrowed_reference
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/main.rs:165:15
[INFO] [stderr]     |
[INFO] [stderr] 165 | fn judge(cds: &Credits, req: &Require) -> bool {
[INFO] [stderr]     |               ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/main.rs:175:20
[INFO] [stderr]     |
[INFO] [stderr] 175 | fn get_result(cds: &Credits, req: &Require) -> String {
[INFO] [stderr]     |                    ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]    --> src/main.rs:189:48
[INFO] [stderr]     |
[INFO] [stderr] 189 |                   .map(|(g, _, c)| (g.clone(), c.clone()))
[INFO] [stderr]     |                                                ^^^^^^^^^ help: try dereferencing it: `*c`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::clone_on_copy)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/main.rs:165:15
[INFO] [stderr]     |
[INFO] [stderr] 165 | fn judge(cds: &Credits, req: &Require) -> bool {
[INFO] [stderr]     |               ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/main.rs:175:20
[INFO] [stderr]     |
[INFO] [stderr] 175 | fn get_result(cds: &Credits, req: &Require) -> String {
[INFO] [stderr]     |                    ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]    --> src/main.rs:189:48
[INFO] [stderr]     |
[INFO] [stderr] 189 |                   .map(|(g, _, c)| (g.clone(), c.clone()))
[INFO] [stderr]     |                                                ^^^^^^^^^ help: try dereferencing it: `*c`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::clone_on_copy)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.18s
[INFO] running `"docker" "inspect" "69725ebbc97c5190cc1d7f430e5fc9efe6a28530355e5e77138dc39d0dbe72a8"`
[INFO] running `"docker" "rm" "-f" "69725ebbc97c5190cc1d7f430e5fc9efe6a28530355e5e77138dc39d0dbe72a8"`
[INFO] [stdout] 69725ebbc97c5190cc1d7f430e5fc9efe6a28530355e5e77138dc39d0dbe72a8