[INFO] fetching crate drone-core 0.10.1...
[INFO] checking drone-core-0.10.1 against beta-2019-10-27 for pr-65897
[INFO] extracting crate drone-core 0.10.1 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate drone-core 0.10.1 on toolchain beta-2019-10-27
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate drone-core 0.10.1
[INFO] finished tweaking crates.io crate drone-core 0.10.1
[INFO] tweaked toml for crates.io crate drone-core 0.10.1 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=allow" "-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" "+beta-2019-10-27" "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] d002ca1d788e23111530fad3f9ba2c92c078d54f8fd00718c6b921910b7702bc
[INFO] running `"docker" "start" "-a" "d002ca1d788e23111530fad3f9ba2c92c078d54f8fd00718c6b921910b7702bc"`
[INFO] [stderr]     Checking drone-core v0.10.1 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:17:1
[INFO] [stderr]    |
[INFO] [stderr] 17 | #![feature(alloc_prelude)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:18:1
[INFO] [stderr]    |
[INFO] [stderr] 18 | #![feature(allocator_api)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | #![feature(const_raw_ptr_deref)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:20:1
[INFO] [stderr]    |
[INFO] [stderr] 20 | #![feature(core_intrinsics)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:21:1
[INFO] [stderr]    |
[INFO] [stderr] 21 | #![feature(exhaustive_patterns)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:22:1
[INFO] [stderr]    |
[INFO] [stderr] 22 | #![feature(generator_trait)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | #![feature(generators)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:24:1
[INFO] [stderr]    |
[INFO] [stderr] 24 | #![feature(marker_trait_attr)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:25:1
[INFO] [stderr]    |
[INFO] [stderr] 25 | #![feature(maybe_uninit_extra)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:26:1
[INFO] [stderr]    |
[INFO] [stderr] 26 | #![feature(maybe_uninit_ref)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:27:1
[INFO] [stderr]    |
[INFO] [stderr] 27 | #![feature(never_type)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | #![feature(optin_builtin_traits)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:29:1
[INFO] [stderr]    |
[INFO] [stderr] 29 | #![feature(prelude_import)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:30:1
[INFO] [stderr]    |
[INFO] [stderr] 30 | #![feature(raw_vec_internals)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:31:1
[INFO] [stderr]    |
[INFO] [stderr] 31 | #![feature(result_map_or_else)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:32:1
[INFO] [stderr]    |
[INFO] [stderr] 32 | #![feature(slice_internals)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:33:1
[INFO] [stderr]    |
[INFO] [stderr] 33 | #![feature(todo_macro)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:34:1
[INFO] [stderr]    |
[INFO] [stderr] 34 | #![feature(untagged_unions)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `std`
[INFO] [stderr]   --> src/ffi/mod.rs:31:9
[INFO] [stderr]    |
[INFO] [stderr] 31 |     use std::collections::hash_map::DefaultHasher;
[INFO] [stderr]    |         ^^^ use of undeclared type or module `std`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `std`
[INFO] [stderr]    --> src/sync/mutex.rs:205:9
[INFO] [stderr]     |
[INFO] [stderr] 205 |     use std::{
[INFO] [stderr]     |         ^^^ use of undeclared type or module `std`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `std`
[INFO] [stderr]    --> src/sync/rwlock.rs:299:9
[INFO] [stderr]     |
[INFO] [stderr] 299 |     use std::sync::{
[INFO] [stderr]     |         ^^^ use of undeclared type or module `std`
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `std`
[INFO] [stderr]    --> src/sync/mutex.rs:205:9
[INFO] [stderr]     |
[INFO] [stderr] 205 |     use std::{
[INFO] [stderr]     |         ^^^ use of undeclared type or module `std`
[INFO] [stderr] 
[INFO] [stderr] error: cannot find macro `vec` in this scope
[INFO] [stderr]   --> src/ffi/mod.rs:56:30
[INFO] [stderr]    |
[INFO] [stderr] 56 |         assert!(CString::new(vec![0]).is_err());
[INFO] [stderr]    |                              ^^^
[INFO] [stderr] 
[INFO] [stderr] error: cannot find macro `vec` in this scope
[INFO] [stderr]   --> src/ffi/mod.rs:62:49
[INFO] [stderr]    |
[INFO] [stderr] 62 |             let s = CString::from_vec_unchecked(vec![0]);
[INFO] [stderr]    |                                                 ^^^
[INFO] [stderr] 
[INFO] [stderr] error: cannot find macro `format` in this scope
[INFO] [stderr]   --> src/ffi/mod.rs:70:20
[INFO] [stderr]    |
[INFO] [stderr] 70 |         assert_eq!(format!("{:?}", s), r#""abc\x01\x02\n\xe2\x80\xa6\xff""#);
[INFO] [stderr]    |                    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: cannot find macro `format` in this scope
[INFO] [stderr]   --> src/ffi/mod.rs:96:30
[INFO] [stderr]    |
[INFO] [stderr] 96 |                 Owned::<str>(format!("123\u{FFFD}"))
[INFO] [stderr]    |                              ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `DefaultHasher`
[INFO] [stderr]    --> src/ffi/mod.rs:116:21
[INFO] [stderr]     |
[INFO] [stderr] 116 |         let mut s = DefaultHasher::new();
[INFO] [stderr]     |                     ^^^^^^^^^^^^^ use of undeclared type or module `DefaultHasher`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `DefaultHasher`
[INFO] [stderr]    --> src/ffi/mod.rs:119:21
[INFO] [stderr]     |
[INFO] [stderr] 119 |         let mut s = DefaultHasher::new();
[INFO] [stderr]     |                     ^^^^^^^^^^^^^ use of undeclared type or module `DefaultHasher`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `Ordering`
[INFO] [stderr]    --> src/sync/mutex.rs:234:37
[INFO] [stderr]     |
[INFO] [stderr] 234 |                 self.0.fetch_add(1, Ordering::SeqCst);
[INFO] [stderr]     |                                     ^^^^^^^^ use of undeclared type or module `Ordering`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `Arc`
[INFO] [stderr]    --> src/sync/mutex.rs:237:25
[INFO] [stderr]     |
[INFO] [stderr] 237 |         let num_drops = Arc::new(AtomicUsize::new(0));
[INFO] [stderr]     |                         ^^^ use of undeclared type or module `Arc`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `AtomicUsize`
[INFO] [stderr]    --> src/sync/mutex.rs:237:34
[INFO] [stderr]     |
[INFO] [stderr] 237 |         let num_drops = Arc::new(AtomicUsize::new(0));
[INFO] [stderr]     |                                  ^^^^^^^^^^^ use of undeclared type or module `AtomicUsize`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `Ordering`
[INFO] [stderr]    --> src/sync/mutex.rs:239:35
[INFO] [stderr]     |
[INFO] [stderr] 239 |         assert_eq!(num_drops.load(Ordering::SeqCst), 0);
[INFO] [stderr]     |                                   ^^^^^^^^ use of undeclared type or module `Ordering`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `Ordering`
[INFO] [stderr]    --> src/sync/mutex.rs:242:39
[INFO] [stderr]     |
[INFO] [stderr] 242 |             assert_eq!(num_drops.load(Ordering::SeqCst), 0);
[INFO] [stderr]     |                                       ^^^^^^^^ use of undeclared type or module `Ordering`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `Ordering`
[INFO] [stderr]    --> src/sync/mutex.rs:244:35
[INFO] [stderr]     |
[INFO] [stderr] 244 |         assert_eq!(num_drops.load(Ordering::SeqCst), 1);
[INFO] [stderr]     |                                   ^^^^^^^^ use of undeclared type or module `Ordering`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `Arc`
[INFO] [stderr]    --> src/sync/mutex.rs:256:19
[INFO] [stderr]     |
[INFO] [stderr] 256 |         let arc = Arc::new(Mutex::new(1));
[INFO] [stderr]     |                   ^^^ use of undeclared type or module `Arc`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `Arc`
[INFO] [stderr]    --> src/sync/mutex.rs:257:20
[INFO] [stderr]     |
[INFO] [stderr] 257 |         let arc2 = Arc::new(Mutex::new(arc));
[INFO] [stderr]     |                    ^^^ use of undeclared type or module `Arc`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `Ordering`
[INFO] [stderr]    --> src/sync/rwlock.rs:347:37
[INFO] [stderr]     |
[INFO] [stderr] 347 |                 self.0.fetch_add(1, Ordering::SeqCst);
[INFO] [stderr]     |                                     ^^^^^^^^ use of undeclared type or module `Ordering`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `Arc`
[INFO] [stderr]    --> src/sync/rwlock.rs:350:25
[INFO] [stderr]     |
[INFO] [stderr] 350 |         let num_drops = Arc::new(AtomicUsize::new(0));
[INFO] [stderr]     |                         ^^^ use of undeclared type or module `Arc`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `AtomicUsize`
[INFO] [stderr]    --> src/sync/rwlock.rs:350:34
[INFO] [stderr]     |
[INFO] [stderr] 350 |         let num_drops = Arc::new(AtomicUsize::new(0));
[INFO] [stderr]     |                                  ^^^^^^^^^^^ use of undeclared type or module `AtomicUsize`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `Ordering`
[INFO] [stderr]    --> src/sync/rwlock.rs:352:35
[INFO] [stderr]     |
[INFO] [stderr] 352 |         assert_eq!(num_drops.load(Ordering::SeqCst), 0);
[INFO] [stderr]     |                                   ^^^^^^^^ use of undeclared type or module `Ordering`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `Ordering`
[INFO] [stderr]    --> src/sync/rwlock.rs:355:39
[INFO] [stderr]     |
[INFO] [stderr] 355 |             assert_eq!(num_drops.load(Ordering::SeqCst), 0);
[INFO] [stderr]     |                                       ^^^^^^^^ use of undeclared type or module `Ordering`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `Ordering`
[INFO] [stderr]    --> src/sync/rwlock.rs:357:35
[INFO] [stderr]     |
[INFO] [stderr] 357 |         assert_eq!(num_drops.load(Ordering::SeqCst), 1);
[INFO] [stderr]     |                                   ^^^^^^^^ use of undeclared type or module `Ordering`
[INFO] [stderr] 
[INFO] [stderr] error[E0412]: cannot find type `Arc` in this scope
[INFO] [stderr]    --> src/sync/mutex.rs:231:20
[INFO] [stderr]     |
[INFO] [stderr] 231 |         struct Foo(Arc<AtomicUsize>);
[INFO] [stderr]     |                    ^^^ not found in this scope
[INFO] [stderr] help: possible candidate is found in another module, you can import it into scope
[INFO] [stderr]     |
[INFO] [stderr] 204 |     use alloc::sync::Arc;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error[E0412]: cannot find type `AtomicUsize` in this scope
[INFO] [stderr]    --> src/sync/mutex.rs:231:24
[INFO] [stderr]     |
[INFO] [stderr] 231 |         struct Foo(Arc<AtomicUsize>);
[INFO] [stderr]     |                        ^^^^^^^^^^^ not found in this scope
[INFO] [stderr] help: possible candidates are found in other modules, you can import them into scope
[INFO] [stderr]     |
[INFO] [stderr] 204 |     use core::sync::atomic::AtomicUsize;
[INFO] [stderr]     |
[INFO] [stderr] 204 |     use futures::core_reexport::sync::atomic::AtomicUsize;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `channel` in this scope
[INFO] [stderr]    --> src/sync/mutex.rs:258:24
[INFO] [stderr]     |
[INFO] [stderr] 258 |         let (tx, rx) = channel();
[INFO] [stderr]     |                        ^^^^^^^ not found in this scope
[INFO] [stderr] help: possible candidates are found in other modules, you can import them into scope
[INFO] [stderr]     |
[INFO] [stderr] 204 |     use crate::sync::spsc::oneshot::channel;
[INFO] [stderr]     |
[INFO] [stderr] 204 |     use crate::sync::spsc::pulse::channel;
[INFO] [stderr]     |
[INFO] [stderr] 204 |     use crate::sync::spsc::ring::channel;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error[E0412]: cannot find type `Arc` in this scope
[INFO] [stderr]    --> src/sync/rwlock.rs:344:20
[INFO] [stderr]     |
[INFO] [stderr] 344 |         struct Foo(Arc<AtomicUsize>);
[INFO] [stderr]     |                    ^^^ not found in this scope
[INFO] [stderr] help: possible candidate is found in another module, you can import it into scope
[INFO] [stderr]     |
[INFO] [stderr] 298 |     use alloc::sync::Arc;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error[E0412]: cannot find type `AtomicUsize` in this scope
[INFO] [stderr]    --> src/sync/rwlock.rs:344:24
[INFO] [stderr]     |
[INFO] [stderr] 344 |         struct Foo(Arc<AtomicUsize>);
[INFO] [stderr]     |                        ^^^^^^^^^^^ not found in this scope
[INFO] [stderr] help: possible candidates are found in other modules, you can import them into scope
[INFO] [stderr]     |
[INFO] [stderr] 298 |     use core::sync::atomic::AtomicUsize;
[INFO] [stderr]     |
[INFO] [stderr] 298 |     use futures::core_reexport::sync::atomic::AtomicUsize;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:17:1
[INFO] [stderr]    |
[INFO] [stderr] 17 | #![feature(alloc_prelude)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:18:1
[INFO] [stderr]    |
[INFO] [stderr] 18 | #![feature(allocator_api)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | #![feature(const_raw_ptr_deref)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:20:1
[INFO] [stderr]    |
[INFO] [stderr] 20 | #![feature(core_intrinsics)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:21:1
[INFO] [stderr]    |
[INFO] [stderr] 21 | #![feature(exhaustive_patterns)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:22:1
[INFO] [stderr]    |
[INFO] [stderr] 22 | #![feature(generator_trait)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | #![feature(generators)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:24:1
[INFO] [stderr]    |
[INFO] [stderr] 24 | #![feature(marker_trait_attr)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:25:1
[INFO] [stderr]    |
[INFO] [stderr] 25 | #![feature(maybe_uninit_extra)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:26:1
[INFO] [stderr]    |
[INFO] [stderr] 26 | #![feature(maybe_uninit_ref)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:27:1
[INFO] [stderr]    |
[INFO] [stderr] 27 | #![feature(never_type)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | #![feature(optin_builtin_traits)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:29:1
[INFO] [stderr]    |
[INFO] [stderr] 29 | #![feature(prelude_import)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:30:1
[INFO] [stderr]    |
[INFO] [stderr] 30 | #![feature(raw_vec_internals)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:31:1
[INFO] [stderr]    |
[INFO] [stderr] 31 | #![feature(result_map_or_else)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:32:1
[INFO] [stderr]    |
[INFO] [stderr] 32 | #![feature(slice_internals)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:33:1
[INFO] [stderr]    |
[INFO] [stderr] 33 | #![feature(todo_macro)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:34:1
[INFO] [stderr]    |
[INFO] [stderr] 34 | #![feature(untagged_unions)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 18 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `drone-core`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to 47 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0412, E0425, E0432, E0433, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0412`.
[INFO] [stderr] error: could not compile `drone-core`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "d002ca1d788e23111530fad3f9ba2c92c078d54f8fd00718c6b921910b7702bc"`
[INFO] running `"docker" "rm" "-f" "d002ca1d788e23111530fad3f9ba2c92c078d54f8fd00718c6b921910b7702bc"`
[INFO] [stdout] d002ca1d788e23111530fad3f9ba2c92c078d54f8fd00718c6b921910b7702bc