[INFO] crate un_algebra 0.8.0 is already in cache
[INFO] testing un_algebra-0.8.0 against 1.38.0 for beta-1.39-1
[INFO] extracting crate un_algebra 0.8.0 into work/builds/worker-9/source
[INFO] validating manifest of crates.io crate un_algebra 0.8.0 on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate un_algebra 0.8.0
[INFO] finished tweaking crates.io crate un_algebra 0.8.0
[INFO] tweaked toml for crates.io crate un_algebra 0.8.0 written to work/builds/worker-9/source/Cargo.toml
[INFO] crate crates.io crate un_algebra 0.8.0 already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-9/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-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" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 395496c07ed1c858092f116d3667637e622a982c110d1c9d3f24ba7f99ab9806
[INFO] running `"docker" "start" "-a" "395496c07ed1c858092f116d3667637e622a982c110d1c9d3f24ba7f99ab9806"`
[INFO] [stderr]    Compiling libc v0.2.59
[INFO] [stderr]    Compiling spin v0.5.0
[INFO] [stderr]    Compiling autocfg v0.1.4
[INFO] [stderr]    Compiling rand_core v0.4.0
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]    Compiling syn v0.15.39
[INFO] [stderr]    Compiling ucd-util v0.1.3
[INFO] [stderr]    Compiling lazy_static v1.3.0
[INFO] [stderr]    Compiling regex-syntax v0.6.8
[INFO] [stderr]    Compiling c2-chacha v0.2.2
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling rand_jitter v0.1.4
[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]    Compiling rand_isaac v0.1.1
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling rand_chacha v0.2.0
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling num-rational v0.2.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling num-iter v0.1.39
[INFO] [stderr]    Compiling num-complex v0.2.3
[INFO] [stderr]    Compiling getrandom v0.1.6
[INFO] [stderr]    Compiling wait-timeout v0.2.0
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling rand_core v0.5.0
[INFO] [stderr]    Compiling rand v0.7.0
[INFO] [stderr]    Compiling tempfile v3.1.0
[INFO] [stderr]    Compiling rusty-fork v0.2.2
[INFO] [stderr]    Compiling proptest v0.9.4
[INFO] [stderr]    Compiling num v0.2.0
[INFO] [stderr]    Compiling proptest-derive v0.1.2
[INFO] [stderr]    Compiling un_algebra v0.8.0 (/opt/rustwide/workdir)
[INFO] [stderr] error: couldn't read src/relation/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/relation/relation.rs:11:18
[INFO] [stderr]    |
[INFO] [stderr] 11 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/relation/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/relation/inequality.rs:21:18
[INFO] [stderr]    |
[INFO] [stderr] 21 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/relation/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/relation/equivalence.rs:22:18
[INFO] [stderr]    |
[INFO] [stderr] 22 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/relation/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/relation/total_order.rs:22:18
[INFO] [stderr]    |
[INFO] [stderr] 22 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/relation/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/relation/strict_order.rs:23:18
[INFO] [stderr]    |
[INFO] [stderr] 23 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/relation/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/relation/partial_order.rs:23:18
[INFO] [stderr]    |
[INFO] [stderr] 23 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/magma/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/magma/magma.rs:17:18
[INFO] [stderr]    |
[INFO] [stderr] 17 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/magma/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/magma/add_magma.rs:18:18
[INFO] [stderr]    |
[INFO] [stderr] 18 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/magma/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/magma/mul_magma.rs:19:18
[INFO] [stderr]    |
[INFO] [stderr] 19 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/quasigroup/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/quasigroup/quasigroup.rs:27:18
[INFO] [stderr]    |
[INFO] [stderr] 27 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/semigroup/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/semigroup/semigroup.rs:19:18
[INFO] [stderr]    |
[INFO] [stderr] 19 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/semigroup/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/semigroup/add_semigroup.rs:20:18
[INFO] [stderr]    |
[INFO] [stderr] 20 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/semigroup/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/semigroup/mul_semigroup.rs:21:18
[INFO] [stderr]    |
[INFO] [stderr] 21 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/monoid/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/monoid/monoid.rs:19:18
[INFO] [stderr]    |
[INFO] [stderr] 19 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/monoid/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/monoid/add_monoid.rs:20:18
[INFO] [stderr]    |
[INFO] [stderr] 20 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/monoid/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/monoid/mul_monoid.rs:21:18
[INFO] [stderr]    |
[INFO] [stderr] 21 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/group/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/group/group.rs:19:18
[INFO] [stderr]    |
[INFO] [stderr] 19 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/group/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/group/add_group.rs:20:18
[INFO] [stderr]    |
[INFO] [stderr] 20 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/group/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/group/mul_group.rs:22:18
[INFO] [stderr]    |
[INFO] [stderr] 22 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/com_group/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/com_group/com_group.rs:20:18
[INFO] [stderr]    |
[INFO] [stderr] 20 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/com_group/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/com_group/add_com_group.rs:21:18
[INFO] [stderr]    |
[INFO] [stderr] 21 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/com_group/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/com_group/mul_com_group.rs:21:18
[INFO] [stderr]    |
[INFO] [stderr] 21 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/ring/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/ring/ring.rs:28:18
[INFO] [stderr]    |
[INFO] [stderr] 28 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/com_ring/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/com_ring/com_ring.rs:20:18
[INFO] [stderr]    |
[INFO] [stderr] 20 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/field/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]   --> src/field/field.rs:21:18
[INFO] [stderr]    |
[INFO] [stderr] 21 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/tests/../doc/references.md: No such file or directory (os error 2)
[INFO] [stderr]  --> src/tests/mod.rs:8:18
[INFO] [stderr]   |
[INFO] [stderr] 8 | #![doc(include = "../doc/references.md")]
[INFO] [stderr]   |                  ^^^^^^^^^^^^^^^^^^^^^^ couldn't read file
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(external_doc)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 27 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `un_algebra`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "395496c07ed1c858092f116d3667637e622a982c110d1c9d3f24ba7f99ab9806"`
[INFO] running `"docker" "rm" "-f" "395496c07ed1c858092f116d3667637e622a982c110d1c9d3f24ba7f99ab9806"`
[INFO] [stdout] 395496c07ed1c858092f116d3667637e622a982c110d1c9d3f24ba7f99ab9806