[INFO] fetching crate zia 0.3.2...
[INFO] checking zia-0.3.2 against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] extracting crate zia 0.3.2 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate zia 0.3.2 on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate zia 0.3.2
[INFO] finished tweaking crates.io crate zia 0.3.2
[INFO] tweaked toml for crates.io crate zia 0.3.2 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "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" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "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] 3bd799a9bbd13323298b477c5f0de0208aca132751e1ea33b40957f7df5c7886
[INFO] running `"docker" "start" "-a" "3bd799a9bbd13323298b477c5f0de0208aca132751e1ea33b40957f7df5c7886"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling slog v2.5.2
[INFO] [stderr]     Checking dirs v1.0.5
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking chrono v0.4.9
[INFO] [stderr]     Checking term v0.5.2
[INFO] [stderr]     Checking rusty-fork v0.2.2
[INFO] [stderr]     Checking slog-term v2.4.1
[INFO] [stderr]     Checking proptest v0.9.4
[INFO] [stderr]     Checking zia v0.3.2 (/opt/rustwide/workdir)
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/adding.rs:62:13
[INFO] [stderr]    |
[INFO] [stderr] 62 |             try!(self.try_removing_reduction::<Self::S>(syntax));
[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/adding.rs:65:34
[INFO] [stderr]    |
[INFO] [stderr] 65 |             let syntax_concept = try!(self.concept_from_ast(syntax));
[INFO] [stderr]    |                                  ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/adding.rs:66:39
[INFO] [stderr]    |
[INFO] [stderr] 66 |             let normal_form_concept = try!(self.concept_from_ast(normal_form));
[INFO] [stderr]    |                                       ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/adding.rs:67:13
[INFO] [stderr]    |
[INFO] [stderr] 67 |             try!(self.update_reduction(syntax_concept, normal_form_concept));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:148:39
[INFO] [stderr]     |
[INFO] [stderr] 148 |                     let new_concept = try!(self.new_labelled_default(string));
[INFO] [stderr]     |                                       ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:158:37
[INFO] [stderr]     |
[INFO] [stderr] 158 |                     let mut leftc = try!(self.concept_from_ast(left));
[INFO] [stderr]     |                                     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:159:38
[INFO] [stderr]     |
[INFO] [stderr] 159 |                     let mut rightc = try!(self.concept_from_ast(right));
[INFO] [stderr]     |                                      ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:160:35
[INFO] [stderr]     |
[INFO] [stderr] 160 |                     let concept = try!(self.find_or_insert_definition(leftc, rightc));
[INFO] [stderr]     |                                   ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:162:25
[INFO] [stderr]     |
[INFO] [stderr] 162 |                         try!(self.label(concept, string));
[INFO] [stderr]     |                         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:238:26
[INFO] [stderr]     |
[INFO] [stderr] 238 |         let definition = try!(self.find_or_insert_definition(LABEL, concept));
[INFO] [stderr]     |                          ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:246:9
[INFO] [stderr]     |
[INFO] [stderr] 246 |         try!(self.label(new_default, string));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:261:9
[INFO] [stderr]     |
[INFO] [stderr] 261 |         try!(self.label(label_concept, "label_of"));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:262:9
[INFO] [stderr]     |
[INFO] [stderr] 262 |         try!(self.label(define_concept, ":="));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:263:9
[INFO] [stderr]     |
[INFO] [stderr] 263 |         try!(self.label(reduction_concept, "->"));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:285:17
[INFO] [stderr]     |
[INFO] [stderr] 285 |                 try!(self.insert_definition(definition, lefthand, righthand));
[INFO] [stderr]     |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/context.rs:144:30
[INFO] [stderr]     |
[INFO] [stderr] 144 |         let concept_delta1 = try!(self
[INFO] [stderr]     |                              ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/removing.rs:45:17
[INFO] [stderr]    |
[INFO] [stderr] 45 |                 try!(self.try_delete_concept(concept));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/removing.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 try!(self.try_delete_concept(left));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/removing.rs:53:13
[INFO] [stderr]    |
[INFO] [stderr] 53 |             try!(self.unlabel(concept));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/translating.rs:49:24
[INFO] [stderr]    |
[INFO] [stderr] 49 |         let lefthand = try!(self.ast_from_token(left));
[INFO] [stderr]    |                        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/translating.rs:50:25
[INFO] [stderr]    |
[INFO] [stderr] 50 |         let righthand = try!(self.ast_from_token(right));
[INFO] [stderr]    |                         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/writing.rs:144:17
[INFO] [stderr]     |
[INFO] [stderr] 144 |         let r = try!(self.get_reduction_of_composition(concept));
[INFO] [stderr]     |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/writing.rs:160:9
[INFO] [stderr]     |
[INFO] [stderr] 160 |         try!(self.write_concept(concept).make_reduce_to(reduction));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/writing.rs:173:17
[INFO] [stderr]     |
[INFO] [stderr] 173 |                 try!(self.get_reduction_of_composition(left))
[INFO] [stderr]     |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/writing.rs:178:17
[INFO] [stderr]     |
[INFO] [stderr] 178 |                 try!(self.get_reduction_of_composition(right))
[INFO] [stderr]     |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/writing.rs:212:13
[INFO] [stderr]     |
[INFO] [stderr] 212 |             try!(self.check_reductions(definition, lefthand));
[INFO] [stderr]     |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/writing.rs:213:13
[INFO] [stderr]     |
[INFO] [stderr] 213 |             try!(self.check_reductions(definition, righthand));
[INFO] [stderr]     |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/writing.rs:214:26
[INFO] [stderr]     |
[INFO] [stderr] 214 |             let deltas = try!(self.set_concept_definition_deltas(definition, lefthand, righthand));
[INFO] [stderr]     |                          ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/lib.rs:510:13
[INFO] [stderr]     |
[INFO] [stderr] 510 |             try!(self.define(new, old));
[INFO] [stderr]     |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/lib.rs:530:21
[INFO] [stderr]     |
[INFO] [stderr] 530 |                     try!(self.define_new_syntax(new.to_string(), left, right));
[INFO] [stderr]     |                     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/lib.rs:556:13
[INFO] [stderr]     |
[INFO] [stderr] 556 |             try!(self.relabel(left_concept, &left.to_string()));
[INFO] [stderr]     |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/lib.rs:559:32
[INFO] [stderr]     |
[INFO] [stderr] 559 |             let left_concept = try!(self.concept_from_ast(left));
[INFO] [stderr]     |                                ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/lib.rs:560:33
[INFO] [stderr]     |
[INFO] [stderr] 560 |             let right_concept = try!(self.concept_from_ast(right));
[INFO] [stderr]     |                                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/lib.rs:561:13
[INFO] [stderr]     |
[INFO] [stderr] 561 |             try!(self.insert_definition(concept, left_concept, right_concept));
[INFO] [stderr]     |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/lib.rs:567:9
[INFO] [stderr]     |
[INFO] [stderr] 567 |         try!(self.unlabel(concept));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/adding.rs:158:25
[INFO] [stderr]     |
[INFO] [stderr] 158 |                     let mut leftc = try!(self.concept_from_ast(left));
[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/adding.rs:159:25
[INFO] [stderr]     |
[INFO] [stderr] 159 |                     let mut rightc = try!(self.concept_from_ast(right));
[INFO] [stderr]     |                         ----^^^^^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Checking test_zia v0.2.0
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/adding.rs:62:13
[INFO] [stderr]    |
[INFO] [stderr] 62 |             try!(self.try_removing_reduction::<Self::S>(syntax));
[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/adding.rs:65:34
[INFO] [stderr]    |
[INFO] [stderr] 65 |             let syntax_concept = try!(self.concept_from_ast(syntax));
[INFO] [stderr]    |                                  ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/adding.rs:66:39
[INFO] [stderr]    |
[INFO] [stderr] 66 |             let normal_form_concept = try!(self.concept_from_ast(normal_form));
[INFO] [stderr]    |                                       ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/adding.rs:67:13
[INFO] [stderr]    |
[INFO] [stderr] 67 |             try!(self.update_reduction(syntax_concept, normal_form_concept));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:148:39
[INFO] [stderr]     |
[INFO] [stderr] 148 |                     let new_concept = try!(self.new_labelled_default(string));
[INFO] [stderr]     |                                       ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:158:37
[INFO] [stderr]     |
[INFO] [stderr] 158 |                     let mut leftc = try!(self.concept_from_ast(left));
[INFO] [stderr]     |                                     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:159:38
[INFO] [stderr]     |
[INFO] [stderr] 159 |                     let mut rightc = try!(self.concept_from_ast(right));
[INFO] [stderr]     |                                      ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:160:35
[INFO] [stderr]     |
[INFO] [stderr] 160 |                     let concept = try!(self.find_or_insert_definition(leftc, rightc));
[INFO] [stderr]     |                                   ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:162:25
[INFO] [stderr]     |
[INFO] [stderr] 162 |                         try!(self.label(concept, string));
[INFO] [stderr]     |                         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:238:26
[INFO] [stderr]     |
[INFO] [stderr] 238 |         let definition = try!(self.find_or_insert_definition(LABEL, concept));
[INFO] [stderr]     |                          ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:246:9
[INFO] [stderr]     |
[INFO] [stderr] 246 |         try!(self.label(new_default, string));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:261:9
[INFO] [stderr]     |
[INFO] [stderr] 261 |         try!(self.label(label_concept, "label_of"));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:262:9
[INFO] [stderr]     |
[INFO] [stderr] 262 |         try!(self.label(define_concept, ":="));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:263:9
[INFO] [stderr]     |
[INFO] [stderr] 263 |         try!(self.label(reduction_concept, "->"));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/adding.rs:285:17
[INFO] [stderr]     |
[INFO] [stderr] 285 |                 try!(self.insert_definition(definition, lefthand, righthand));
[INFO] [stderr]     |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/context.rs:144:30
[INFO] [stderr]     |
[INFO] [stderr] 144 |         let concept_delta1 = try!(self
[INFO] [stderr]     |                              ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/removing.rs:45:17
[INFO] [stderr]    |
[INFO] [stderr] 45 |                 try!(self.try_delete_concept(concept));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/removing.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 try!(self.try_delete_concept(left));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/removing.rs:53:13
[INFO] [stderr]    |
[INFO] [stderr] 53 |             try!(self.unlabel(concept));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/translating.rs:49:24
[INFO] [stderr]    |
[INFO] [stderr] 49 |         let lefthand = try!(self.ast_from_token(left));
[INFO] [stderr]    |                        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/translating.rs:50:25
[INFO] [stderr]    |
[INFO] [stderr] 50 |         let righthand = try!(self.ast_from_token(right));
[INFO] [stderr]    |                         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/writing.rs:144:17
[INFO] [stderr]     |
[INFO] [stderr] 144 |         let r = try!(self.get_reduction_of_composition(concept));
[INFO] [stderr]     |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/writing.rs:160:9
[INFO] [stderr]     |
[INFO] [stderr] 160 |         try!(self.write_concept(concept).make_reduce_to(reduction));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/writing.rs:173:17
[INFO] [stderr]     |
[INFO] [stderr] 173 |                 try!(self.get_reduction_of_composition(left))
[INFO] [stderr]     |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/writing.rs:178:17
[INFO] [stderr]     |
[INFO] [stderr] 178 |                 try!(self.get_reduction_of_composition(right))
[INFO] [stderr]     |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/writing.rs:212:13
[INFO] [stderr]     |
[INFO] [stderr] 212 |             try!(self.check_reductions(definition, lefthand));
[INFO] [stderr]     |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/writing.rs:213:13
[INFO] [stderr]     |
[INFO] [stderr] 213 |             try!(self.check_reductions(definition, righthand));
[INFO] [stderr]     |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/writing.rs:214:26
[INFO] [stderr]     |
[INFO] [stderr] 214 |             let deltas = try!(self.set_concept_definition_deltas(definition, lefthand, righthand));
[INFO] [stderr]     |                          ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/lib.rs:510:13
[INFO] [stderr]     |
[INFO] [stderr] 510 |             try!(self.define(new, old));
[INFO] [stderr]     |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/lib.rs:530:21
[INFO] [stderr]     |
[INFO] [stderr] 530 |                     try!(self.define_new_syntax(new.to_string(), left, right));
[INFO] [stderr]     |                     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/lib.rs:556:13
[INFO] [stderr]     |
[INFO] [stderr] 556 |             try!(self.relabel(left_concept, &left.to_string()));
[INFO] [stderr]     |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/lib.rs:559:32
[INFO] [stderr]     |
[INFO] [stderr] 559 |             let left_concept = try!(self.concept_from_ast(left));
[INFO] [stderr]     |                                ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/lib.rs:560:33
[INFO] [stderr]     |
[INFO] [stderr] 560 |             let right_concept = try!(self.concept_from_ast(right));
[INFO] [stderr]     |                                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/lib.rs:561:13
[INFO] [stderr]     |
[INFO] [stderr] 561 |             try!(self.insert_definition(concept, left_concept, right_concept));
[INFO] [stderr]     |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/lib.rs:567:9
[INFO] [stderr]     |
[INFO] [stderr] 567 |         try!(self.unlabel(concept));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/adding.rs:158:25
[INFO] [stderr]     |
[INFO] [stderr] 158 |                     let mut leftc = try!(self.concept_from_ast(left));
[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/adding.rs:159:25
[INFO] [stderr]     |
[INFO] [stderr] 159 |                     let mut rightc = try!(self.concept_from_ast(right));
[INFO] [stderr]     |                         ----^^^^^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 23.86s
[INFO] running `"docker" "inspect" "3bd799a9bbd13323298b477c5f0de0208aca132751e1ea33b40957f7df5c7886"`
[INFO] running `"docker" "rm" "-f" "3bd799a9bbd13323298b477c5f0de0208aca132751e1ea33b40957f7df5c7886"`
[INFO] [stdout] 3bd799a9bbd13323298b477c5f0de0208aca132751e1ea33b40957f7df5c7886