[INFO] crate flatten 0.2.2 is already in cache
[INFO] checking flatten-0.2.2 against try#1a608893c03d7722effeb0058e82770bd36b4b3c for pr-66504-1
[INFO] extracting crate flatten 0.2.2 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate flatten 0.2.2 on toolchain 1a608893c03d7722effeb0058e82770bd36b4b3c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "read-manifest" "--manifest-path" "Cargo.toml"`
[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-8/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] warning: `default-features = [".."]` was found in [features]. Did you mean to use `default = [".."]`?
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 54b9074d5786acd85d04a2944542e0b7174289ae43d380bce4a6ab5a8cf6a6db
[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" "54b9074d5786acd85d04a2944542e0b7174289ae43d380bce4a6ab5a8cf6a6db"`
[INFO] [stderr] warning: `default-features = [".."]` was found in [features]. Did you mean to use `default = [".."]`?
[INFO] [stderr]     Checking flatten v0.2.2 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0557]: feature has been removed
[INFO] [stderr]  --> src/lib.rs:1:34
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(optin_builtin_traits, on_unimplemented, never_type, specialization)]
[INFO] [stderr]   |                                  ^^^^^^^^^^^^^^^^ feature has been removed
[INFO] [stderr] 
[INFO] [stderr] error[E0557]: feature has been removed
[INFO] [stderr]  --> src/lib.rs:1:34
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(optin_builtin_traits, on_unimplemented, never_type, specialization)]
[INFO] [stderr]   |                                  ^^^^^^^^^^^^^^^^ feature has been removed
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: this is an internal attribute that will never be stable
[INFO] [stderr]   --> src/tuple.rs:18:1
[INFO] [stderr]    |
[INFO] [stderr] 18 | / #[rustc_on_unimplemented = "
[INFO] [stderr] 19 | | If you are writing generic code, add a bound like
[INFO] [stderr] 20 | |
[INFO] [stderr] 21 | |     where {OrigType}: Flatten,
[INFO] [stderr] ...  |
[INFO] [stderr] 31 | |
[INFO] [stderr] 32 | | This is required because current type system does not have negative reasoning."]
[INFO] [stderr]    | |________________________________________________________________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/29642
[INFO] [stderr]    = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: this is an internal attribute that will never be stable
[INFO] [stderr]   --> src/tuple.rs:18:1
[INFO] [stderr]    |
[INFO] [stderr] 18 | / #[rustc_on_unimplemented = "
[INFO] [stderr] 19 | | If you are writing generic code, add a bound like
[INFO] [stderr] 20 | |
[INFO] [stderr] 21 | |     where {OrigType}: Flatten,
[INFO] [stderr] ...  |
[INFO] [stderr] 31 | |
[INFO] [stderr] 32 | | This is required because current type system does not have negative reasoning."]
[INFO] [stderr]    | |________________________________________________________________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/29642
[INFO] [stderr]    = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> src/into_cons.rs:234:21
[INFO] [stderr]     |
[INFO] [stderr] 234 |                       ( $( $N ),* )
[INFO] [stderr]     |                       ^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 248 | / impl_for_tuple! {
[INFO] [stderr] 249 | |    (0, A),
[INFO] [stderr] 250 | |    (1, B),
[INFO] [stderr] 251 | | }
[INFO] [stderr]     | |_- in this macro invocation
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> src/into_cons.rs:234:21
[INFO] [stderr]     |
[INFO] [stderr] 234 |                       ( $( $N ),* )
[INFO] [stderr]     |                       ^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 248 | / impl_for_tuple! {
[INFO] [stderr] 249 | |    (0, A),
[INFO] [stderr] 250 | |    (1, B),
[INFO] [stderr] 251 | | }
[INFO] [stderr]     | |_- in this macro invocation
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0557, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0557`.
[INFO] [stderr] error: could not compile `flatten`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0557, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0557`.
[INFO] [stderr] error: could not compile `flatten`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "54b9074d5786acd85d04a2944542e0b7174289ae43d380bce4a6ab5a8cf6a6db"`
[INFO] running `"docker" "rm" "-f" "54b9074d5786acd85d04a2944542e0b7174289ae43d380bce4a6ab5a8cf6a6db"`
[INFO] [stdout] 54b9074d5786acd85d04a2944542e0b7174289ae43d380bce4a6ab5a8cf6a6db