[INFO] fetching crate flatten 0.2.2...
[INFO] documenting flatten-0.2.2 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate flatten 0.2.2 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate flatten 0.2.2 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate flatten 0.2.2
[INFO] finished tweaking crates.io crate flatten 0.2.2
[INFO] tweaked toml for crates.io crate flatten 0.2.2 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: `default-features = [".."]` was found in [features]. Did you mean to use `default = [".."]`?
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 21f4d1c54584d42e56a0b02c8f55dd56a4ab035170fc62427e027de071837a3c
[INFO] running `Command { std: "docker" "start" "-a" "21f4d1c54584d42e56a0b02c8f55dd56a4ab035170fc62427e027de071837a3c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "21f4d1c54584d42e56a0b02c8f55dd56a4ab035170fc62427e027de071837a3c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "21f4d1c54584d42e56a0b02c8f55dd56a4ab035170fc62427e027de071837a3c", kill_on_drop: false }`
[INFO] [stdout] 21f4d1c54584d42e56a0b02c8f55dd56a4ab035170fc62427e027de071837a3c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 350c377c9229a0b0a50a80aa4863d99407cdb9240744ed376a6335741f353c45
[INFO] running `Command { std: "docker" "start" "-a" "350c377c9229a0b0a50a80aa4863d99407cdb9240744ed376a6335741f353c45", kill_on_drop: false }`
[INFO] [stderr] warning: `default-features = [".."]` was found in [features]. Did you mean to use `default = [".."]`?
[INFO] [stderr]  Documenting flatten v0.2.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:1:34
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(optin_builtin_traits, on_unimplemented, never_type, specialization)]
[INFO] [stdout]   |                                  ^^^^^^^^^^^^^^^^ feature has been removed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(optin_builtin_traits, on_unimplemented, never_type, specialization)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now
[INFO] [stdout]   --> src/cons/mod.rs:24:6
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl !ValidHead for Nil {}
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now
[INFO] [stdout]   --> src/cons/mod.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 25 | impl<H, T> !ValidHead for Cons<H, T> {}
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now
[INFO] [stdout]    --> src/into_cons.rs:153:6
[INFO] [stdout]     |
[INFO] [stdout] 153 | impl !NotTuple for () {}
[INFO] [stdout]     |      ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now
[INFO] [stdout]    --> src/into_cons.rs:154:9
[INFO] [stdout]     |
[INFO] [stdout] 154 | impl<A> !NotTuple for (A,) {}
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now
[INFO] [stdout]    --> src/into_cons.rs:155:9
[INFO] [stdout]     |
[INFO] [stdout] 155 | impl<R> !NotTuple for Either<!, R> {}
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now
[INFO] [stdout]    --> src/into_cons.rs:218:36
[INFO] [stdout]     |
[INFO] [stdout] 218 |           impl<$first_ty, $( $N ),*> !NotTuple for ( $first_ty, $( $N, )* ) {}
[INFO] [stdout]     |                                      ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 248 | / impl_for_tuple! {
[INFO] [stdout] 249 | |    (0, A),
[INFO] [stdout] 250 | |    (1, B),
[INFO] [stdout] 251 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now
[INFO] [stdout]    --> src/into_cons.rs:218:36
[INFO] [stdout]     |
[INFO] [stdout] 218 |           impl<$first_ty, $( $N ),*> !NotTuple for ( $first_ty, $( $N, )* ) {}
[INFO] [stdout]     |                                      ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 253 | / impl_for_tuple! {
[INFO] [stdout] 254 | |    (0, A),
[INFO] [stdout] 255 | |    (1, B),
[INFO] [stdout] 256 | |    (2, C),
[INFO] [stdout] 257 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now
[INFO] [stdout]    --> src/into_cons.rs:218:36
[INFO] [stdout]     |
[INFO] [stdout] 218 |           impl<$first_ty, $( $N ),*> !NotTuple for ( $first_ty, $( $N, )* ) {}
[INFO] [stdout]     |                                      ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 259 | / impl_for_tuple! {
[INFO] [stdout] 260 | |    (0, A),
[INFO] [stdout] 261 | |    (1, B),
[INFO] [stdout] 262 | |    (2, C),
[INFO] [stdout] 263 | |    (3, D),
[INFO] [stdout] 264 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now
[INFO] [stdout]    --> src/into_cons.rs:218:36
[INFO] [stdout]     |
[INFO] [stdout] 218 |           impl<$first_ty, $( $N ),*> !NotTuple for ( $first_ty, $( $N, )* ) {}
[INFO] [stdout]     |                                      ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 266 | / impl_for_tuple! {
[INFO] [stdout] 267 | |    (0, A),
[INFO] [stdout] 268 | |    (1, B),
[INFO] [stdout] 269 | |    (2, C),
[INFO] [stdout] 270 | |    (3, D),
[INFO] [stdout] 271 | |    (4, E),
[INFO] [stdout] 272 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now
[INFO] [stdout]    --> src/into_cons.rs:218:36
[INFO] [stdout]     |
[INFO] [stdout] 218 |           impl<$first_ty, $( $N ),*> !NotTuple for ( $first_ty, $( $N, )* ) {}
[INFO] [stdout]     |                                      ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 274 | / impl_for_tuple! {
[INFO] [stdout] 275 | |    (0, A),
[INFO] [stdout] 276 | |    (1, B),
[INFO] [stdout] 277 | |    (2, C),
[INFO] [stdout] ...   |
[INFO] [stdout] 280 | |    (5, F),
[INFO] [stdout] 281 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now
[INFO] [stdout]    --> src/into_cons.rs:218:36
[INFO] [stdout]     |
[INFO] [stdout] 218 |           impl<$first_ty, $( $N ),*> !NotTuple for ( $first_ty, $( $N, )* ) {}
[INFO] [stdout]     |                                      ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 283 | / impl_for_tuple! {
[INFO] [stdout] 284 | |    (0, A),
[INFO] [stdout] 285 | |    (1, B),
[INFO] [stdout] 286 | |    (2, C),
[INFO] [stdout] ...   |
[INFO] [stdout] 290 | |    (6, G),
[INFO] [stdout] 291 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now
[INFO] [stdout]    --> src/into_cons.rs:218:36
[INFO] [stdout]     |
[INFO] [stdout] 218 |           impl<$first_ty, $( $N ),*> !NotTuple for ( $first_ty, $( $N, )* ) {}
[INFO] [stdout]     |                                      ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 293 | / impl_for_tuple! {
[INFO] [stdout] 294 | |    (0, A),
[INFO] [stdout] 295 | |    (1, B),
[INFO] [stdout] 296 | |    (2, C),
[INFO] [stdout] ...   |
[INFO] [stdout] 301 | |    (7, H),
[INFO] [stdout] 302 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now
[INFO] [stdout]    --> src/into_cons.rs:218:36
[INFO] [stdout]     |
[INFO] [stdout] 218 |           impl<$first_ty, $( $N ),*> !NotTuple for ( $first_ty, $( $N, )* ) {}
[INFO] [stdout]     |                                      ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 304 | / impl_for_tuple! {
[INFO] [stdout] 305 | |    (0, A),
[INFO] [stdout] 306 | |    (1, B),
[INFO] [stdout] 307 | |    (2, C),
[INFO] [stdout] ...   |
[INFO] [stdout] 313 | |    (8, I),
[INFO] [stdout] 314 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now
[INFO] [stdout]    --> src/into_cons.rs:218:36
[INFO] [stdout]     |
[INFO] [stdout] 218 |           impl<$first_ty, $( $N ),*> !NotTuple for ( $first_ty, $( $N, )* ) {}
[INFO] [stdout]     |                                      ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 316 | / impl_for_tuple! {
[INFO] [stdout] 317 | |    (0, A),
[INFO] [stdout] 318 | |    (1, B),
[INFO] [stdout] 319 | |    (2, C),
[INFO] [stdout] ...   |
[INFO] [stdout] 326 | |    (9, J),
[INFO] [stdout] 327 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now
[INFO] [stdout]    --> src/into_cons.rs:218:36
[INFO] [stdout]     |
[INFO] [stdout] 218 |           impl<$first_ty, $( $N ),*> !NotTuple for ( $first_ty, $( $N, )* ) {}
[INFO] [stdout]     |                                      ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 329 | / impl_for_tuple! {
[INFO] [stdout] 330 | |    (0, A),
[INFO] [stdout] 331 | |    (1, B),
[INFO] [stdout] 332 | |    (2, C),
[INFO] [stdout] ...   |
[INFO] [stdout] 340 | |    (10, K),
[INFO] [stdout] 341 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now
[INFO] [stdout]    --> src/into_cons.rs:218:36
[INFO] [stdout]     |
[INFO] [stdout] 218 |           impl<$first_ty, $( $N ),*> !NotTuple for ( $first_ty, $( $N, )* ) {}
[INFO] [stdout]     |                                      ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 343 | / impl_for_tuple! {
[INFO] [stdout] 344 | |    (0, A),
[INFO] [stdout] 345 | |    (1, B),
[INFO] [stdout] 346 | |    (2, C),
[INFO] [stdout] ...   |
[INFO] [stdout] 355 | |    (11, L),
[INFO] [stdout] 356 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: this is an internal attribute that will never be stable
[INFO] [stdout]   --> src/tuple.rs:18:1
[INFO] [stdout]    |
[INFO] [stdout] 18 | / #[rustc_on_unimplemented = "
[INFO] [stdout] 19 | | If you are writing generic code, add a bound like
[INFO] [stdout] 20 | |
[INFO] [stdout] 21 | |     where {OrigType}: Flatten,
[INFO] [stdout] ...  |
[INFO] [stdout] 31 | |
[INFO] [stdout] 32 | | This is required because current type system does not have negative reasoning."]
[INFO] [stdout]    | |________________________________________________________________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 20 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0557, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `flatten`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name flatten src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern either=/opt/rustwide/target/debug/deps/libeither-b62de5d6d87ac0af.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "350c377c9229a0b0a50a80aa4863d99407cdb9240744ed376a6335741f353c45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "350c377c9229a0b0a50a80aa4863d99407cdb9240744ed376a6335741f353c45", kill_on_drop: false }`
[INFO] [stdout] 350c377c9229a0b0a50a80aa4863d99407cdb9240744ed376a6335741f353c45