[INFO] crate puzzle-solver 0.4.1 is already in cache
[INFO] checking puzzle-solver-0.4.1 against master#209b2be09fcaff937480d1fbbe8b31646e361c7a for pr-70917
[INFO] extracting crate puzzle-solver 0.4.1 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate puzzle-solver 0.4.1 on toolchain 209b2be09fcaff937480d1fbbe8b31646e361c7a
[INFO] running `"/workspace/cargo-home/bin/cargo" "+209b2be09fcaff937480d1fbbe8b31646e361c7a" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate puzzle-solver 0.4.1
[INFO] finished tweaking crates.io crate puzzle-solver 0.4.1
[INFO] tweaked toml for crates.io crate puzzle-solver 0.4.1 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+209b2be09fcaff937480d1fbbe8b31646e361c7a" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+209b2be09fcaff937480d1fbbe8b31646e361c7a" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+209b2be09fcaff937480d1fbbe8b31646e361c7a" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] c2ee48579c7eb46ce2d23fd00aa4defbcd5c38f5e47de3853e725acd8a64a8d2
[INFO] running `"docker" "start" "-a" "c2ee48579c7eb46ce2d23fd00aa4defbcd5c38f5e47de3853e725acd8a64a8d2"`
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking puzzle-solver v0.4.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/constraint/alldifferent.rs:40:13
[INFO] [stderr]    |
[INFO] [stderr] 40 |             try!(search.remove_candidate(var2, val));
[INFO] [stderr]    |             ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/constraint/alldifferent.rs:70:21
[INFO] [stderr]    |
[INFO] [stderr] 70 |                     try!(search.set_candidate(var, val));
[INFO] [stderr]    |                     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/constraint/equality.rs:63:17
[INFO] [stderr]    |
[INFO] [stderr] 63 |                 try!(search.set_candidate(var, val.to_integer()));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/constraint/equality.rs:81:38
[INFO] [stderr]    |
[INFO] [stderr] 81 |             let (min_val, max_val) = try!(search.get_min_max(var));
[INFO] [stderr]    |                                      ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/constraint/equality.rs:107:38
[INFO] [stderr]     |
[INFO] [stderr] 107 |             let (min_val, max_val) = try!(search.get_min_max(var));
[INFO] [stderr]     |                                      ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/constraint/equality.rs:120:23
[INFO] [stderr]     |
[INFO] [stderr] 120 |                     = try!(search.bound_candidate_range(var, min_bnd, max_bnd));
[INFO] [stderr]     |                       ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/puzzle.rs:470:22
[INFO] [stderr]     |
[INFO] [stderr] 470 |             let rc = try!(self.constraints[cidx].substitute(from, to));
[INFO] [stderr]     |                      ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/puzzle.rs:734:17
[INFO] [stderr]     |
[INFO] [stderr] 734 |                 try!(constraint.on_assigned(self, var, val));
[INFO] [stderr]     |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/puzzle.rs:764:21
[INFO] [stderr]     |
[INFO] [stderr] 764 |                     try!(self.assign(idx, val));
[INFO] [stderr]     |                     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/puzzle.rs:778:21
[INFO] [stderr]     |
[INFO] [stderr] 778 |                     try!(constraint.on_updated(self));
[INFO] [stderr]     |                     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/puzzle.rs:819:31
[INFO] [stderr]     |
[INFO] [stderr] 819 |         let new_constraints = try!(self.constraints.substitute(from, to));
[INFO] [stderr]     |                               ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/puzzle.rs:826:13
[INFO] [stderr]     |
[INFO] [stderr] 826 |             try!(self.set_candidate(to, val));
[INFO] [stderr]     |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/constraint/mod.rs:15:34
[INFO] [stderr]    |
[INFO] [stderr] 15 |     fn vars<'a>(&'a self) -> Box<Iterator<Item=&'a VarToken> + 'a>;
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=&'a VarToken> + 'a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/constraint/mod.rs:33:28
[INFO] [stderr]    |
[INFO] [stderr] 33 |             -> PsResult<Rc<Constraint>>;
[INFO] [stderr]    |                            ^^^^^^^^^^ help: use `dyn`: `dyn Constraint`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/constraint/alldifferent.rs:33:34
[INFO] [stderr]    |
[INFO] [stderr] 33 |     fn vars<'a>(&'a self) -> Box<Iterator<Item=&'a VarToken> + 'a> {
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=&'a VarToken> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/constraint/alldifferent.rs:79:28
[INFO] [stderr]    |
[INFO] [stderr] 79 |             -> PsResult<Rc<Constraint>> {
[INFO] [stderr]    |                            ^^^^^^^^^^ help: use `dyn`: `dyn Constraint`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/constraint/equality.rs:35:34
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn vars<'a>(&'a self) -> Box<Iterator<Item=&'a VarToken> + 'a> {
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=&'a VarToken> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/constraint/equality.rs:138:28
[INFO] [stderr]     |
[INFO] [stderr] 138 |             -> PsResult<Rc<Constraint>> {
[INFO] [stderr]     |                            ^^^^^^^^^^ help: use `dyn`: `dyn Constraint`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/constraint/unify.rs:36:34
[INFO] [stderr]    |
[INFO] [stderr] 36 |     fn vars<'a>(&'a self) -> Box<Iterator<Item=&'a VarToken> + 'a> {
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=&'a VarToken> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/constraint/unify.rs:53:28
[INFO] [stderr]    |
[INFO] [stderr] 53 |             -> PsResult<Rc<Constraint>> {
[INFO] [stderr]    |                            ^^^^^^^^^^ help: use `dyn`: `dyn Constraint`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/puzzle.rs:43:25
[INFO] [stderr]    |
[INFO] [stderr] 43 |     constraints: Vec<Rc<Constraint>>,
[INFO] [stderr]    |                         ^^^^^^^^^^ help: use `dyn`: `dyn Constraint`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/puzzle.rs:50:25
[INFO] [stderr]    |
[INFO] [stderr] 50 |     constraints: Vec<Rc<Constraint>>,
[INFO] [stderr]    |                         ^^^^^^^^^^ help: use `dyn`: `dyn Constraint`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/puzzle.rs:81:34
[INFO] [stderr]    |
[INFO] [stderr] 81 |     fn iter<'a>(&'a self) -> Box<Iterator<Item=Val> + 'a> {
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Val> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/puzzle.rs:482:39
[INFO] [stderr]     |
[INFO] [stderr] 482 |     fn init_wake(constraints: &Vec<Rc<Constraint>>, num_vars: usize)
[INFO] [stderr]     |                                       ^^^^^^^^^^ help: use `dyn`: `dyn Constraint`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/puzzle.rs:542:20
[INFO] [stderr]     |
[INFO] [stderr] 542 |             -> Box<Iterator<Item=Val> + 'a> {
[INFO] [stderr]     |                    ^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Val> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/constraint/alldifferent.rs:40:13
[INFO] [stderr]    |
[INFO] [stderr] 40 |             try!(search.remove_candidate(var2, val));
[INFO] [stderr]    |             ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/constraint/alldifferent.rs:70:21
[INFO] [stderr]    |
[INFO] [stderr] 70 |                     try!(search.set_candidate(var, val));
[INFO] [stderr]    |                     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/constraint/equality.rs:63:17
[INFO] [stderr]    |
[INFO] [stderr] 63 |                 try!(search.set_candidate(var, val.to_integer()));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/constraint/equality.rs:81:38
[INFO] [stderr]    |
[INFO] [stderr] 81 |             let (min_val, max_val) = try!(search.get_min_max(var));
[INFO] [stderr]    |                                      ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/constraint/equality.rs:107:38
[INFO] [stderr]     |
[INFO] [stderr] 107 |             let (min_val, max_val) = try!(search.get_min_max(var));
[INFO] [stderr]     |                                      ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/constraint/equality.rs:120:23
[INFO] [stderr]     |
[INFO] [stderr] 120 |                     = try!(search.bound_candidate_range(var, min_bnd, max_bnd));
[INFO] [stderr]     |                       ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/puzzle.rs:470:22
[INFO] [stderr]     |
[INFO] [stderr] 470 |             let rc = try!(self.constraints[cidx].substitute(from, to));
[INFO] [stderr]     |                      ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/puzzle.rs:734:17
[INFO] [stderr]     |
[INFO] [stderr] 734 |                 try!(constraint.on_assigned(self, var, val));
[INFO] [stderr]     |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/puzzle.rs:764:21
[INFO] [stderr]     |
[INFO] [stderr] 764 |                     try!(self.assign(idx, val));
[INFO] [stderr]     |                     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/puzzle.rs:778:21
[INFO] [stderr]     |
[INFO] [stderr] 778 |                     try!(constraint.on_updated(self));
[INFO] [stderr]     |                     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/puzzle.rs:819:31
[INFO] [stderr]     |
[INFO] [stderr] 819 |         let new_constraints = try!(self.constraints.substitute(from, to));
[INFO] [stderr]     |                               ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/puzzle.rs:826:13
[INFO] [stderr]     |
[INFO] [stderr] 826 |             try!(self.set_candidate(to, val));
[INFO] [stderr]     |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/constraint/mod.rs:15:34
[INFO] [stderr]    |
[INFO] [stderr] 15 |     fn vars<'a>(&'a self) -> Box<Iterator<Item=&'a VarToken> + 'a>;
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=&'a VarToken> + 'a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/constraint/mod.rs:33:28
[INFO] [stderr]    |
[INFO] [stderr] 33 |             -> PsResult<Rc<Constraint>>;
[INFO] [stderr]    |                            ^^^^^^^^^^ help: use `dyn`: `dyn Constraint`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/constraint/alldifferent.rs:33:34
[INFO] [stderr]    |
[INFO] [stderr] 33 |     fn vars<'a>(&'a self) -> Box<Iterator<Item=&'a VarToken> + 'a> {
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=&'a VarToken> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/constraint/alldifferent.rs:79:28
[INFO] [stderr]    |
[INFO] [stderr] 79 |             -> PsResult<Rc<Constraint>> {
[INFO] [stderr]    |                            ^^^^^^^^^^ help: use `dyn`: `dyn Constraint`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/constraint/equality.rs:35:34
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn vars<'a>(&'a self) -> Box<Iterator<Item=&'a VarToken> + 'a> {
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=&'a VarToken> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/constraint/equality.rs:138:28
[INFO] [stderr]     |
[INFO] [stderr] 138 |             -> PsResult<Rc<Constraint>> {
[INFO] [stderr]     |                            ^^^^^^^^^^ help: use `dyn`: `dyn Constraint`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/constraint/unify.rs:36:34
[INFO] [stderr]    |
[INFO] [stderr] 36 |     fn vars<'a>(&'a self) -> Box<Iterator<Item=&'a VarToken> + 'a> {
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=&'a VarToken> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/constraint/unify.rs:53:28
[INFO] [stderr]    |
[INFO] [stderr] 53 |             -> PsResult<Rc<Constraint>> {
[INFO] [stderr]    |                            ^^^^^^^^^^ help: use `dyn`: `dyn Constraint`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/puzzle.rs:43:25
[INFO] [stderr]    |
[INFO] [stderr] 43 |     constraints: Vec<Rc<Constraint>>,
[INFO] [stderr]    |                         ^^^^^^^^^^ help: use `dyn`: `dyn Constraint`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/puzzle.rs:50:25
[INFO] [stderr]    |
[INFO] [stderr] 50 |     constraints: Vec<Rc<Constraint>>,
[INFO] [stderr]    |                         ^^^^^^^^^^ help: use `dyn`: `dyn Constraint`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/puzzle.rs:81:34
[INFO] [stderr]    |
[INFO] [stderr] 81 |     fn iter<'a>(&'a self) -> Box<Iterator<Item=Val> + 'a> {
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Val> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/puzzle.rs:482:39
[INFO] [stderr]     |
[INFO] [stderr] 482 |     fn init_wake(constraints: &Vec<Rc<Constraint>>, num_vars: usize)
[INFO] [stderr]     |                                       ^^^^^^^^^^ help: use `dyn`: `dyn Constraint`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/puzzle.rs:542:20
[INFO] [stderr]     |
[INFO] [stderr] 542 |             -> Box<Iterator<Item=Val> + 'a> {
[INFO] [stderr]     |                    ^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Val> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/puzzle.rs:589:21
[INFO] [stderr]     |
[INFO] [stderr] 589 |                 let mut set = Rc::make_mut(rc);
[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/puzzle.rs:622:21
[INFO] [stderr]     |
[INFO] [stderr] 622 |                 let mut set = Rc::make_mut(rc);
[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/puzzle.rs:666:25
[INFO] [stderr]     |
[INFO] [stderr] 666 |                     let mut set = Rc::make_mut(rc);
[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/puzzle.rs:898:14
[INFO] [stderr]     |
[INFO] [stderr] 898 |         let (mut l, mut r) = slice.split_at_mut(b);
[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/puzzle.rs:898:21
[INFO] [stderr]     |
[INFO] [stderr] 898 |         let (mut l, mut r) = slice.split_at_mut(b);
[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/puzzle.rs:589:21
[INFO] [stderr]     |
[INFO] [stderr] 589 |                 let mut set = Rc::make_mut(rc);
[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/puzzle.rs:622:21
[INFO] [stderr]     |
[INFO] [stderr] 622 |                 let mut set = Rc::make_mut(rc);
[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/puzzle.rs:666:25
[INFO] [stderr]     |
[INFO] [stderr] 666 |                     let mut set = Rc::make_mut(rc);
[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/puzzle.rs:898:14
[INFO] [stderr]     |
[INFO] [stderr] 898 |         let (mut l, mut r) = slice.split_at_mut(b);
[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/puzzle.rs:898:21
[INFO] [stderr]     |
[INFO] [stderr] 898 |         let (mut l, mut r) = slice.split_at_mut(b);
[INFO] [stderr]     |                     ----^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> tests/queens.rs:26:17
[INFO] [stderr]    |
[INFO] [stderr] 26 |                 try!(search.remove_candidate(var2, x1 - dy));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> tests/queens.rs:27:17
[INFO] [stderr]    |
[INFO] [stderr] 27 |                 try!(search.remove_candidate(var2, x1 + dy));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> tests/queens.rs:15:34
[INFO] [stderr]    |
[INFO] [stderr] 15 |     fn vars<'a>(&'a self) -> Box<Iterator<Item=&'a VarToken> + 'a> {
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=&'a VarToken> + 'a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> tests/queens.rs:35:28
[INFO] [stderr]    |
[INFO] [stderr] 35 |             -> PsResult<Rc<Constraint>> {
[INFO] [stderr]    |                            ^^^^^^^^^^ help: use `dyn`: `dyn Constraint`
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> tests/takuzu.rs:31:17
[INFO] [stderr]    |
[INFO] [stderr] 31 |                 try!(search.set_candidate(var, val & 1));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> tests/takuzu.rs:41:17
[INFO] [stderr]    |
[INFO] [stderr] 41 |                 try!(search.remove_candidate(self.value, c));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> tests/takuzu.rs:22:34
[INFO] [stderr]    |
[INFO] [stderr] 22 |     fn vars<'a>(&'a self) -> Box<Iterator<Item=&'a VarToken> + 'a> {
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=&'a VarToken> + 'a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> tests/takuzu.rs:49:28
[INFO] [stderr]    |
[INFO] [stderr] 49 |             -> PsResult<Rc<Constraint>> {
[INFO] [stderr]    |                            ^^^^^^^^^^ help: use `dyn`: `dyn Constraint`
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> tests/nonogram.rs:165:25
[INFO] [stderr]     |
[INFO] [stderr] 165 |                         try!(search.set_candidate(self.vars[idx], 0));
[INFO] [stderr]     |                         ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> tests/nonogram.rs:167:25
[INFO] [stderr]     |
[INFO] [stderr] 167 |                         try!(search.set_candidate(self.vars[idx], 1));
[INFO] [stderr]     |                         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> tests/nonogram.rs:143:34
[INFO] [stderr]     |
[INFO] [stderr] 143 |     fn vars<'a>(&'a self) -> Box<Iterator<Item=&'a VarToken> + 'a> {
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=&'a VarToken> + 'a`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> tests/nonogram.rs:176:28
[INFO] [stderr]     |
[INFO] [stderr] 176 |             -> PsResult<Rc<Constraint>> {
[INFO] [stderr]     |                            ^^^^^^^^^^ help: use `dyn`: `dyn Constraint`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> tests/nonogram.rs:149:14
[INFO] [stderr]     |
[INFO] [stderr] 149 |         for (mut pos, &var) in trial.iter_mut().zip(&self.vars) {
[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]     Finished dev [unoptimized + debuginfo] target(s) in 5.22s
[INFO] running `"docker" "inspect" "c2ee48579c7eb46ce2d23fd00aa4defbcd5c38f5e47de3853e725acd8a64a8d2"`
[INFO] running `"docker" "rm" "-f" "c2ee48579c7eb46ce2d23fd00aa4defbcd5c38f5e47de3853e725acd8a64a8d2"`
[INFO] [stdout] c2ee48579c7eb46ce2d23fd00aa4defbcd5c38f5e47de3853e725acd8a64a8d2
