[INFO] updating cached repository mohas556/cassowaryr
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mohas556/cassowaryr
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mohas556/cassowaryr" "work/ex/pr-57745/sources/master#f613dc138b4012cf3d2eb40718fbcc7cf0a34039/gh/mohas556/cassowaryr"`
[INFO] [stderr] Cloning into 'work/ex/pr-57745/sources/master#f613dc138b4012cf3d2eb40718fbcc7cf0a34039/gh/mohas556/cassowaryr'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mohas556/cassowaryr" "work/ex/pr-57745/sources/try#29640c57b5f92febba0e40c50cb863c9a7ede51d/gh/mohas556/cassowaryr"`
[INFO] [stderr] Cloning into 'work/ex/pr-57745/sources/try#29640c57b5f92febba0e40c50cb863c9a7ede51d/gh/mohas556/cassowaryr'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b4c9c281eefe247c2731a22c003220e2475e5629
[INFO] sha for GitHub repo mohas556/cassowaryr: b4c9c281eefe247c2731a22c003220e2475e5629
[INFO] validating manifest of mohas556/cassowaryr on toolchain master#f613dc138b4012cf3d2eb40718fbcc7cf0a34039
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+f613dc138b4012cf3d2eb40718fbcc7cf0a34039-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of mohas556/cassowaryr on toolchain try#29640c57b5f92febba0e40c50cb863c9a7ede51d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+29640c57b5f92febba0e40c50cb863c9a7ede51d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing mohas556/cassowaryr
[INFO] finished frobbing mohas556/cassowaryr
[INFO] frobbed toml for mohas556/cassowaryr written to work/ex/pr-57745/sources/master#f613dc138b4012cf3d2eb40718fbcc7cf0a34039/gh/mohas556/cassowaryr/Cargo.toml
[INFO] started frobbing mohas556/cassowaryr
[INFO] finished frobbing mohas556/cassowaryr
[INFO] frobbed toml for mohas556/cassowaryr written to work/ex/pr-57745/sources/try#29640c57b5f92febba0e40c50cb863c9a7ede51d/gh/mohas556/cassowaryr/Cargo.toml
[INFO] crate mohas556/cassowaryr has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+f613dc138b4012cf3d2eb40718fbcc7cf0a34039-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+29640c57b5f92febba0e40c50cb863c9a7ede51d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking mohas556/cassowaryr against try#29640c57b5f92febba0e40c50cb863c9a7ede51d for pr-57745
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57745/worker-6/try#29640c57b5f92febba0e40c50cb863c9a7ede51d:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57745/sources/try#29640c57b5f92febba0e40c50cb863c9a7ede51d/gh/mohas556/cassowaryr:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+29640c57b5f92febba0e40c50cb863c9a7ede51d-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] d1d09ef6a9cce1a10432d4cf29c8e03c97f08f9c251bebaa3d46753071e9212c
[INFO] running `"docker" "start" "-a" "d1d09ef6a9cce1a10432d4cf29c8e03c97f08f9c251bebaa3d46753071e9212c"`
[INFO] [stderr]     Checking cassowaryr v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]     --> src/lib.rs:2055:36
[INFO] [stderr]      |
[INFO] [stderr] 2055 |                                 if (val > 0f64 && var.pivotable()) {
[INFO] [stderr]      |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]      |
[INFO] [stderr]      = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]     --> src/lib.rs:2055:36
[INFO] [stderr]      |
[INFO] [stderr] 2055 |                                 if (val > 0f64 && var.pivotable()) {
[INFO] [stderr]      |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]      |
[INFO] [stderr]      = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `prev_edit_constant` is never read
[INFO] [stderr]     --> src/lib.rs:1838:25
[INFO] [stderr]      |
[INFO] [stderr] 1838 |                         prev_edit_constant =  some_val;
[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: value assigned to `r` is never read
[INFO] [stderr]     --> src/lib.rs:2006:25
[INFO] [stderr]      |
[INFO] [stderr] 2006 |                 let mut r: f64 = 0f64;
[INFO] [stderr]      |                         ^
[INFO] [stderr]      |
[INFO] [stderr]      = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `prev_edit_constant` is never read
[INFO] [stderr]     --> src/lib.rs:1838:25
[INFO] [stderr]      |
[INFO] [stderr] 1838 |                         prev_edit_constant =  some_val;
[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: value assigned to `r` is never read
[INFO] [stderr]     --> src/lib.rs:2006:25
[INFO] [stderr]      |
[INFO] [stderr] 2006 |                 let mut r: f64 = 0f64;
[INFO] [stderr]      |                         ^
[INFO] [stderr]      |
[INFO] [stderr]      = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `prev_edit_constant` is never read
[INFO] [stderr]     --> src/main.rs:1830:7
[INFO] [stderr]      |
[INFO] [stderr] 1830 |                         prev_edit_constant =  some_val;
[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: value assigned to `r` is never read
[INFO] [stderr]     --> src/main.rs:1997:25
[INFO] [stderr]      |
[INFO] [stderr] 1997 |                 let mut r: f64 = 0f64;
[INFO] [stderr]      |                         ^
[INFO] [stderr]      |
[INFO] [stderr]      = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `prev_edit_constant` is never read
[INFO] [stderr]     --> src/main.rs:1830:7
[INFO] [stderr]      |
[INFO] [stderr] 1830 |                         prev_edit_constant =  some_val;
[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: value assigned to `r` is never read
[INFO] [stderr]     --> src/main.rs:1997:25
[INFO] [stderr]      |
[INFO] [stderr] 1997 |                 let mut r: f64 = 0f64;
[INFO] [stderr]      |                         ^
[INFO] [stderr]      |
[INFO] [stderr]      = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:863:14
[INFO] [stderr]     |
[INFO] [stderr] 863 |             let mut expr = Rc::new(Expression::new_blank());
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:915:21
[INFO] [stderr]     |
[INFO] [stderr] 915 |                 let mut expr = Rc::new(Expression::new_single_variable(var_two));
[INFO] [stderr]     |                     ----^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:937:17
[INFO] [stderr]     |
[INFO] [stderr] 937 |             let mut cexpr: Rc<Expression> = expr.clone();
[INFO] [stderr]     |                 ----^^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:966:17
[INFO] [stderr]     |
[INFO] [stderr] 966 |             let mut expr = expr_two.clone();
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:1146:17
[INFO] [stderr]      |
[INFO] [stderr] 1146 |             let mut expr = Rc::new(Expression::new_blank());
[INFO] [stderr]      |                 ----^^^^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:863:14
[INFO] [stderr]     |
[INFO] [stderr] 863 |             let mut expr = Rc::new(Expression::new_blank());
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:1268:17
[INFO] [stderr]      |
[INFO] [stderr] 1268 |             let mut prev_edit_constant = 0f64;
[INFO] [stderr]      |                 ----^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:1270:17
[INFO] [stderr]      |
[INFO] [stderr] 1270 |             let mut expr = self.new_expression(constraint,
[INFO] [stderr]      |                 ----^^^^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:915:21
[INFO] [stderr]     |
[INFO] [stderr] 915 |                 let mut expr = Rc::new(Expression::new_single_variable(var_two));
[INFO] [stderr]     |                     ----^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:937:17
[INFO] [stderr]     |
[INFO] [stderr] 937 |             let mut cexpr: Rc<Expression> = expr.clone();
[INFO] [stderr]     |                 ----^^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:966:17
[INFO] [stderr]     |
[INFO] [stderr] 966 |             let mut expr = expr_two.clone();
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:1389:22
[INFO] [stderr]      |
[INFO] [stderr] 1389 |                 Some(mut expr) => {
[INFO] [stderr]      |                      ----^^^^
[INFO] [stderr]      |                      |
[INFO] [stderr]      |                      help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:1146:17
[INFO] [stderr]      |
[INFO] [stderr] 1146 |             let mut expr = Rc::new(Expression::new_blank());
[INFO] [stderr]      |                 ----^^^^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:1429:17
[INFO] [stderr]      |
[INFO] [stderr] 1429 |             let mut obj_row: Rc<Expression> = self.get_row_expression(&obj).unwrap();
[INFO] [stderr]      |                 ----^^^^^^^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:1432:17
[INFO] [stderr]      |
[INFO] [stderr] 1432 |             let mut error_option = self.error_vars.borrow_mut().get(constraint).map(|x| x.clone());
[INFO] [stderr]      |                 ----^^^^^^^^^^^^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:1268:17
[INFO] [stderr]      |
[INFO] [stderr] 1268 |             let mut prev_edit_constant = 0f64;
[INFO] [stderr]      |                 ----^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:1270:17
[INFO] [stderr]      |
[INFO] [stderr] 1270 |             let mut expr = self.new_expression(constraint,
[INFO] [stderr]      |                 ----^^^^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:1389:22
[INFO] [stderr]      |
[INFO] [stderr] 1389 |                 Some(mut expr) => {
[INFO] [stderr]      |                      ----^^^^
[INFO] [stderr]      |                      |
[INFO] [stderr]      |                      help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:1760:25
[INFO] [stderr]      |
[INFO] [stderr] 1760 |                     let mut row_expr = self.get_row_expression(&obj).unwrap();
[INFO] [stderr]      |                         ----^^^^^^^^
[INFO] [stderr]      |                         |
[INFO] [stderr]      |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:1800:25
[INFO] [stderr]      |
[INFO] [stderr] 1800 |                     let mut row_expr = self.get_row_expression(&obj).unwrap();
[INFO] [stderr]      |                         ----^^^^^^^^
[INFO] [stderr]      |                         |
[INFO] [stderr]      |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:1816:25
[INFO] [stderr]      |
[INFO] [stderr] 1816 |                     let mut some_val = constraint_expr.mref.borrow().clone().constant.clone();
[INFO] [stderr]      |                         ----^^^^^^^^
[INFO] [stderr]      |                         |
[INFO] [stderr]      |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:1429:17
[INFO] [stderr]      |
[INFO] [stderr] 1429 |             let mut obj_row: Rc<Expression> = self.get_row_expression(&obj).unwrap();
[INFO] [stderr]      |                 ----^^^^^^^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:1432:17
[INFO] [stderr]      |
[INFO] [stderr] 1432 |             let mut error_option = self.error_vars.borrow_mut().get(constraint).map(|x| x.clone());
[INFO] [stderr]      |                 ----^^^^^^^^^^^^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:2038:17
[INFO] [stderr]      |
[INFO] [stderr] 2038 |             let mut len = self.infeasible_rows.borrow().len();
[INFO] [stderr]      |                 ----^^^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:1760:25
[INFO] [stderr]      |
[INFO] [stderr] 1760 |                     let mut row_expr = self.get_row_expression(&obj).unwrap();
[INFO] [stderr]      |                         ----^^^^^^^^
[INFO] [stderr]      |                         |
[INFO] [stderr]      |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:1800:25
[INFO] [stderr]      |
[INFO] [stderr] 1800 |                     let mut row_expr = self.get_row_expression(&obj).unwrap();
[INFO] [stderr]      |                         ----^^^^^^^^
[INFO] [stderr]      |                         |
[INFO] [stderr]      |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:1816:25
[INFO] [stderr]      |
[INFO] [stderr] 1816 |                     let mut some_val = constraint_expr.mref.borrow().clone().constant.clone();
[INFO] [stderr]      |                         ----^^^^^^^^
[INFO] [stderr]      |                         |
[INFO] [stderr]      |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:2184:14
[INFO] [stderr]      |
[INFO] [stderr] 2184 |             let mut m = self.columns.borrow().clone();
[INFO] [stderr]      |                 ----^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1216:10
[INFO] [stderr]      |
[INFO] [stderr] 1216 |             self.add_constraint(&c);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1280:21
[INFO] [stderr]      |
[INFO] [stderr] 1280 |                     self.add_with_artificial(&expr);
[INFO] [stderr]      |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1307:17
[INFO] [stderr]      |
[INFO] [stderr] 1307 |                 self.optimise(&obj);
[INFO] [stderr]      |                 ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1373:13
[INFO] [stderr]      |
[INFO] [stderr] 1373 |             self.optimise(&obj_var);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1401:29
[INFO] [stderr]      |
[INFO] [stderr] 1401 |                             self.pivot(&entry_var, &slack_var);
[INFO] [stderr]      |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1514:25
[INFO] [stderr]      |
[INFO] [stderr] 1514 |                         self.pivot(&marker, &exit_var.unwrap());
[INFO] [stderr]      |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1574:17
[INFO] [stderr]      |
[INFO] [stderr] 1574 |                 self.optimise(&obj);
[INFO] [stderr]      |                 ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1691:13
[INFO] [stderr]      |
[INFO] [stderr] 1691 |             self.remove_constraint(constraint);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1702:17
[INFO] [stderr]      |
[INFO] [stderr] 1702 |                 self.add_edit_var(var, Strength::REQUIRED);
[INFO] [stderr]      |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1703:17
[INFO] [stderr]      |
[INFO] [stderr] 1703 |                 self.begin_edit();
[INFO] [stderr]      |                 ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1706:25
[INFO] [stderr]      |
[INFO] [stderr] 1706 |                         self.end_edit();
[INFO] [stderr]      |                         ^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1854:13
[INFO] [stderr]      |
[INFO] [stderr] 1854 |             self.dual_optimise();
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:2026:17
[INFO] [stderr]      |
[INFO] [stderr] 2026 |                 self.pivot(&entry_var.clone().unwrap(), &exit_var.clone().unwrap());
[INFO] [stderr]      |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:2069:29
[INFO] [stderr]      |
[INFO] [stderr] 2069 |                             self.pivot(&entry_var.clone().unwrap(), &exit_var);
[INFO] [stderr]      |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:2038:17
[INFO] [stderr]      |
[INFO] [stderr] 2038 |             let mut len = self.infeasible_rows.borrow().len();
[INFO] [stderr]      |                 ----^^^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:2184:14
[INFO] [stderr]      |
[INFO] [stderr] 2184 |             let mut m = self.columns.borrow().clone();
[INFO] [stderr]      |                 ----^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:2406:17
[INFO] [stderr]      |
[INFO] [stderr] 2406 |             let mut x: Rc<Variable> = Rc::new(Variable::new(String::from("var1"),
[INFO] [stderr]      |                 ----^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/main.rs:2410:17
[INFO] [stderr]      |
[INFO] [stderr] 2410 |             let mut y: Rc<Variable> = Rc::new(Variable::new(String::from("var2"),
[INFO] [stderr]      |                 ----^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1216:10
[INFO] [stderr]      |
[INFO] [stderr] 1216 |             self.add_constraint(&c);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1280:21
[INFO] [stderr]      |
[INFO] [stderr] 1280 |                     self.add_with_artificial(&expr);
[INFO] [stderr]      |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1307:17
[INFO] [stderr]      |
[INFO] [stderr] 1307 |                 self.optimise(&obj);
[INFO] [stderr]      |                 ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1373:13
[INFO] [stderr]      |
[INFO] [stderr] 1373 |             self.optimise(&obj_var);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1401:29
[INFO] [stderr]      |
[INFO] [stderr] 1401 |                             self.pivot(&entry_var, &slack_var);
[INFO] [stderr]      |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1514:25
[INFO] [stderr]      |
[INFO] [stderr] 1514 |                         self.pivot(&marker, &exit_var.unwrap());
[INFO] [stderr]      |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1574:17
[INFO] [stderr]      |
[INFO] [stderr] 1574 |                 self.optimise(&obj);
[INFO] [stderr]      |                 ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1691:13
[INFO] [stderr]      |
[INFO] [stderr] 1691 |             self.remove_constraint(constraint);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1702:17
[INFO] [stderr]      |
[INFO] [stderr] 1702 |                 self.add_edit_var(var, Strength::REQUIRED);
[INFO] [stderr]      |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1703:17
[INFO] [stderr]      |
[INFO] [stderr] 1703 |                 self.begin_edit();
[INFO] [stderr]      |                 ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1706:25
[INFO] [stderr]      |
[INFO] [stderr] 1706 |                         self.end_edit();
[INFO] [stderr]      |                         ^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:1854:13
[INFO] [stderr]      |
[INFO] [stderr] 1854 |             self.dual_optimise();
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:2026:17
[INFO] [stderr]      |
[INFO] [stderr] 2026 |                 self.pivot(&entry_var.clone().unwrap(), &exit_var.clone().unwrap());
[INFO] [stderr]      |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:2069:29
[INFO] [stderr]      |
[INFO] [stderr] 2069 |                             self.pivot(&entry_var.clone().unwrap(), &exit_var);
[INFO] [stderr]      |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/main.rs:2424:13
[INFO] [stderr]      |
[INFO] [stderr] 2424 |             s.add_constraint(&c);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.26s
[INFO] running `"docker" "inspect" "d1d09ef6a9cce1a10432d4cf29c8e03c97f08f9c251bebaa3d46753071e9212c"`
[INFO] running `"docker" "rm" "-f" "d1d09ef6a9cce1a10432d4cf29c8e03c97f08f9c251bebaa3d46753071e9212c"`
[INFO] [stdout] d1d09ef6a9cce1a10432d4cf29c8e03c97f08f9c251bebaa3d46753071e9212c