[INFO] fetching crate epsilonz_algebra 0.0.1...
[INFO] checking epsilonz_algebra-0.0.1 against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] extracting crate epsilonz_algebra 0.0.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate epsilonz_algebra 0.0.1 on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate epsilonz_algebra 0.0.1
[INFO] finished tweaking crates.io crate epsilonz_algebra 0.0.1
[INFO] tweaked toml for crates.io crate epsilonz_algebra 0.0.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] [stdout] b9e3a3ad6be08ce6b57ded34eba9f7b84cad87cc4ff7efcafbf0227458af6737
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "b9e3a3ad6be08ce6b57ded34eba9f7b84cad87cc4ff7efcafbf0227458af6737"`
[INFO] [stderr]     Checking epsilonz_algebra v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:30:26
[INFO] [stderr]    |
[INFO] [stderr] 30 |     fn break_with(&self, |Self| -> bool) -> (Self,Self);
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:32:26
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn drop_while(&self, |Self| -> bool) -> Self;
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:34:26
[INFO] [stderr]    |
[INFO] [stderr] 34 |     fn fold<A>(&self, A, |A,Self| -> A) -> A;
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected one of `::` or `:`, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:34:33
[INFO] [stderr]    |
[INFO] [stderr] 34 |     fn fold<A>(&self, A, |A,Self| -> A) -> A;
[INFO] [stderr]    |                                 ^ expected one of `::` or `:` here
[INFO] [stderr] 
[INFO] [stderr] error: expected type, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:35:36
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn fold_map<A:Monoid>(&self, f:|Self| -> A) -> A;
[INFO] [stderr]    |                                    ^ expected type
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:40:20
[INFO] [stderr]    |
[INFO] [stderr] 40 |     fn span(&self, |Self| -> bool) -> (Self,Self);
[INFO] [stderr]    |                    ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:41:21
[INFO] [stderr]    |
[INFO] [stderr] 41 |     fn split(&self, |Self| -> bool) -> Vec<Self>;
[INFO] [stderr]    |                     ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:46:26
[INFO] [stderr]    |
[INFO] [stderr] 46 |     fn take_while(&self, |Self| -> bool) -> Self;
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:54:19
[INFO] [stderr]    |
[INFO] [stderr] 54 |     fn all(&self, |char| -> bool) -> bool;
[INFO] [stderr]    |                   ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:55:19
[INFO] [stderr]    |
[INFO] [stderr] 55 |     fn any(&self, |char| -> bool) -> bool;
[INFO] [stderr]    |                   ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:56:26
[INFO] [stderr]    |
[INFO] [stderr] 56 |     fn break_with(&self, |Self| -> bool, |char| -> bool) -> (Self,Self);
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:56:42
[INFO] [stderr]    |
[INFO] [stderr] 56 |     fn break_with(&self, |Self| -> bool, |char| -> bool) -> (Self,Self);
[INFO] [stderr]    |                                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:58:26
[INFO] [stderr]    |
[INFO] [stderr] 58 |     fn concat_map(&self, |char| -> Self) -> Self;
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:59:26
[INFO] [stderr]    |
[INFO] [stderr] 59 |     fn drop_while(&self, |Self| -> bool, |char| -> bool) -> Self;
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:59:42
[INFO] [stderr]    |
[INFO] [stderr] 59 |     fn drop_while(&self, |Self| -> bool, |char| -> bool) -> Self;
[INFO] [stderr]    |                                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:60:20
[INFO] [stderr]    |
[INFO] [stderr] 60 |     fn find(&self, |char| -> bool) -> Option<char>;
[INFO] [stderr]    |                    ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:61:26
[INFO] [stderr]    |
[INFO] [stderr] 61 |     fn fold<A>(&self, A, |A,Self| -> A, |A,char| -> A) -> A;
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected one of `::` or `:`, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:61:33
[INFO] [stderr]    |
[INFO] [stderr] 61 |     fn fold<A>(&self, A, |A,Self| -> A, |A,char| -> A) -> A;
[INFO] [stderr]    |                                 ^ expected one of `::` or `:` here
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:61:41
[INFO] [stderr]    |
[INFO] [stderr] 61 |     fn fold<A>(&self, A, |A,Self| -> A, |A,char| -> A) -> A;
[INFO] [stderr]    |                                         ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected one of `:` or `@`, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:61:48
[INFO] [stderr]    |
[INFO] [stderr] 61 |     fn fold<A>(&self, A, |A,Self| -> A, |A,char| -> A) -> A;
[INFO] [stderr]    |                                                ^ expected one of `:` or `@` here
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:63:19
[INFO] [stderr]    |
[INFO] [stderr] 63 |     fn map(&self, |char| -> char) -> Self;
[INFO] [stderr]    |                   ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:64:31
[INFO] [stderr]    |
[INFO] [stderr] 64 |     fn map_accum<A>(&self, A, |A,char| -> (A,char)) -> A;
[INFO] [stderr]    |                               ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected one of `:` or `@`, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:64:38
[INFO] [stderr]    |
[INFO] [stderr] 64 |     fn map_accum<A>(&self, A, |A,char| -> (A,char)) -> A;
[INFO] [stderr]    |                                      ^ expected one of `:` or `@` here
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:65:26
[INFO] [stderr]    |
[INFO] [stderr] 65 |     fn scan(&self, char, |char,char| -> char) -> Self;
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected one of `:` or `@`, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:65:36
[INFO] [stderr]    |
[INFO] [stderr] 65 |     fn scan(&self, char, |char,char| -> char) -> Self;
[INFO] [stderr]    |                                    ^ expected one of `:` or `@` here
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:67:20
[INFO] [stderr]    |
[INFO] [stderr] 67 |     fn span(&self, |Self| -> bool, |char| -> bool) -> (Self,Self);
[INFO] [stderr]    |                    ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:67:36
[INFO] [stderr]    |
[INFO] [stderr] 67 |     fn span(&self, |Self| -> bool, |char| -> bool) -> (Self,Self);
[INFO] [stderr]    |                                    ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:68:21
[INFO] [stderr]    |
[INFO] [stderr] 68 |     fn split(&self, |char| -> bool) -> Vec<Self>;
[INFO] [stderr]    |                     ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:70:26
[INFO] [stderr]    |
[INFO] [stderr] 70 |     fn take_while(&self, |Self| -> bool, |char| -> bool) -> Self;
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:70:42
[INFO] [stderr]    |
[INFO] [stderr] 70 |     fn take_while(&self, |Self| -> bool, |char| -> bool) -> Self;
[INFO] [stderr]    |                                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: non-builtin inner attributes are unstable
[INFO] [stderr]  --> src/lib.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![license = "MIT"]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: for more information, see https://github.com/rust-lang/rust/issues/54726
[INFO] [stderr]   = help: add `#![feature(custom_inner_attributes)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:30:26
[INFO] [stderr]    |
[INFO] [stderr] 30 |     fn break_with(&self, |Self| -> bool) -> (Self,Self);
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:32:26
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn drop_while(&self, |Self| -> bool) -> Self;
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:34:26
[INFO] [stderr]    |
[INFO] [stderr] 34 |     fn fold<A>(&self, A, |A,Self| -> A) -> A;
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected one of `::` or `:`, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:34:33
[INFO] [stderr]    |
[INFO] [stderr] 34 |     fn fold<A>(&self, A, |A,Self| -> A) -> A;
[INFO] [stderr]    |                                 ^ expected one of `::` or `:` here
[INFO] [stderr] 
[INFO] [stderr] error: expected type, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:35:36
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn fold_map<A:Monoid>(&self, f:|Self| -> A) -> A;
[INFO] [stderr]    |                                    ^ expected type
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:40:20
[INFO] [stderr]    |
[INFO] [stderr] 40 |     fn span(&self, |Self| -> bool) -> (Self,Self);
[INFO] [stderr]    |                    ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:41:21
[INFO] [stderr]    |
[INFO] [stderr] 41 |     fn split(&self, |Self| -> bool) -> Vec<Self>;
[INFO] [stderr]    |                     ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:46:26
[INFO] [stderr]    |
[INFO] [stderr] 46 |     fn take_while(&self, |Self| -> bool) -> Self;
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:54:19
[INFO] [stderr]    |
[INFO] [stderr] 54 |     fn all(&self, |char| -> bool) -> bool;
[INFO] [stderr]    |                   ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:55:19
[INFO] [stderr]    |
[INFO] [stderr] 55 |     fn any(&self, |char| -> bool) -> bool;
[INFO] [stderr]    |                   ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:56:26
[INFO] [stderr]    |
[INFO] [stderr] 56 |     fn break_with(&self, |Self| -> bool, |char| -> bool) -> (Self,Self);
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:56:42
[INFO] [stderr]    |
[INFO] [stderr] 56 |     fn break_with(&self, |Self| -> bool, |char| -> bool) -> (Self,Self);
[INFO] [stderr]    |                                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:58:26
[INFO] [stderr]    |
[INFO] [stderr] 58 |     fn concat_map(&self, |char| -> Self) -> Self;
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:59:26
[INFO] [stderr]    |
[INFO] [stderr] 59 |     fn drop_while(&self, |Self| -> bool, |char| -> bool) -> Self;
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:59:42
[INFO] [stderr]    |
[INFO] [stderr] 59 |     fn drop_while(&self, |Self| -> bool, |char| -> bool) -> Self;
[INFO] [stderr]    |                                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:60:20
[INFO] [stderr]    |
[INFO] [stderr] 60 |     fn find(&self, |char| -> bool) -> Option<char>;
[INFO] [stderr]    |                    ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:61:26
[INFO] [stderr]    |
[INFO] [stderr] 61 |     fn fold<A>(&self, A, |A,Self| -> A, |A,char| -> A) -> A;
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected one of `::` or `:`, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:61:33
[INFO] [stderr]    |
[INFO] [stderr] 61 |     fn fold<A>(&self, A, |A,Self| -> A, |A,char| -> A) -> A;
[INFO] [stderr]    |                                 ^ expected one of `::` or `:` here
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:61:41
[INFO] [stderr]    |
[INFO] [stderr] 61 |     fn fold<A>(&self, A, |A,Self| -> A, |A,char| -> A) -> A;
[INFO] [stderr]    |                                         ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected one of `:` or `@`, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:61:48
[INFO] [stderr]    |
[INFO] [stderr] 61 |     fn fold<A>(&self, A, |A,Self| -> A, |A,char| -> A) -> A;
[INFO] [stderr]    |                                                ^ expected one of `:` or `@` here
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:63:19
[INFO] [stderr]    |
[INFO] [stderr] 63 |     fn map(&self, |char| -> char) -> Self;
[INFO] [stderr]    |                   ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:64:31
[INFO] [stderr]    |
[INFO] [stderr] 64 |     fn map_accum<A>(&self, A, |A,char| -> (A,char)) -> A;
[INFO] [stderr]    |                               ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected one of `:` or `@`, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:64:38
[INFO] [stderr]    |
[INFO] [stderr] 64 |     fn map_accum<A>(&self, A, |A,char| -> (A,char)) -> A;
[INFO] [stderr]    |                                      ^ expected one of `:` or `@` here
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:65:26
[INFO] [stderr]    |
[INFO] [stderr] 65 |     fn scan(&self, char, |char,char| -> char) -> Self;
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected one of `:` or `@`, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:65:36
[INFO] [stderr]    |
[INFO] [stderr] 65 |     fn scan(&self, char, |char,char| -> char) -> Self;
[INFO] [stderr]    |                                    ^ expected one of `:` or `@` here
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:67:20
[INFO] [stderr]    |
[INFO] [stderr] 67 |     fn span(&self, |Self| -> bool, |char| -> bool) -> (Self,Self);
[INFO] [stderr]    |                    ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:67:36
[INFO] [stderr]    |
[INFO] [stderr] 67 |     fn span(&self, |Self| -> bool, |char| -> bool) -> (Self,Self);
[INFO] [stderr]    |                                    ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:68:21
[INFO] [stderr]    |
[INFO] [stderr] 68 |     fn split(&self, |char| -> bool) -> Vec<Self>;
[INFO] [stderr]    |                     ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:70:26
[INFO] [stderr]    |
[INFO] [stderr] 70 |     fn take_while(&self, |Self| -> bool, |char| -> bool) -> Self;
[INFO] [stderr]    |                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `|`
[INFO] [stderr]   --> src/structure/monoid/theory.rs:70:42
[INFO] [stderr]    |
[INFO] [stderr] 70 |     fn take_while(&self, |Self| -> bool, |char| -> bool) -> Self;
[INFO] [stderr]    |                                          ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: non-builtin inner attributes are unstable
[INFO] [stderr]  --> src/lib.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![license = "MIT"]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: for more information, see https://github.com/rust-lang/rust/issues/54726
[INFO] [stderr]   = help: add `#![feature(custom_inner_attributes)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error[E0463]: can't find crate for `collections`
[INFO] [stderr]   --> src/lib.rs:16:1
[INFO] [stderr]    |
[INFO] [stderr] 16 | extern crate collections;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 32 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0463, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0463`.
[INFO] [stderr] error: could not compile `epsilonz_algebra`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0463]: can't find crate for `collections`
[INFO] [stderr]   --> src/lib.rs:16:1
[INFO] [stderr]    |
[INFO] [stderr] 16 | extern crate collections;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 32 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0463, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0463`.
[INFO] [stderr] error: could not compile `epsilonz_algebra`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b9e3a3ad6be08ce6b57ded34eba9f7b84cad87cc4ff7efcafbf0227458af6737"`
[INFO] running `"docker" "rm" "-f" "b9e3a3ad6be08ce6b57ded34eba9f7b84cad87cc4ff7efcafbf0227458af6737"`
[INFO] [stdout] b9e3a3ad6be08ce6b57ded34eba9f7b84cad87cc4ff7efcafbf0227458af6737