[INFO] fetching crate drone 0.14.0...
[INFO] testing drone-0.14.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate drone 0.14.0 into /workspace/builds/worker-4-tc1/source
[INFO] removed /workspace/builds/worker-4-tc1/source/rust-toolchain
[INFO] started tweaking crates.io crate drone 0.14.0
[INFO] finished tweaking crates.io crate drone 0.14.0
[INFO] tweaked toml for crates.io crate drone 0.14.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate drone 0.14.0 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate drone 0.14.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 28eff8a6a9daf73531beaa892601c13b9769c0731fb4d76dd5323e707a2cc9f4
[INFO] running `Command { std: "docker" "start" "-a" "28eff8a6a9daf73531beaa892601c13b9769c0731fb4d76dd5323e707a2cc9f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "28eff8a6a9daf73531beaa892601c13b9769c0731fb4d76dd5323e707a2cc9f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "28eff8a6a9daf73531beaa892601c13b9769c0731fb4d76dd5323e707a2cc9f4", kill_on_drop: false }`
[INFO] [stdout] 28eff8a6a9daf73531beaa892601c13b9769c0731fb4d76dd5323e707a2cc9f4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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" "RUSTFLAGS=--cap-lints=warn" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0839c6c6934f917e32607f0113ac21a2ab50f76870ee0882463a84a7d2baa251
[INFO] running `Command { std: "docker" "start" "-a" "0839c6c6934f917e32607f0113ac21a2ab50f76870ee0882463a84a7d2baa251", kill_on_drop: false }`
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[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling thiserror-impl v1.0.24
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[INFO] [stderr]    Compiling pest_derive v2.1.0
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[INFO] [stderr]    Compiling handlebars v3.5.4
[INFO] [stderr]    Compiling drone-config v0.14.0
[INFO] [stderr]    Compiling prettytable-rs v0.8.0
[INFO] [stderr]    Compiling drone v0.14.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]   --> src/lib.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 | #![feature(generators)]
[INFO] [stdout]    |            ^^^^^^^^^^ feature has been removed
[INFO] [stdout]    |
[INFO] [stdout]    = note: removed in 1.75.0; see <https://github.com/rust-lang/rust/pull/116958> for more information
[INFO] [stdout]    = note: renamed to `coroutines`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved imports `std::ops::Generator`, `std::ops::GeneratorState`
[INFO] [stdout]  --> src/heap/trace.rs:7:11
[INFO] [stdout]   |
[INFO] [stdout] 7 |     ops::{Generator, GeneratorState},
[INFO] [stdout]   |           ^^^^^^^^^  ^^^^^^^^^^^^^^ no `GeneratorState` in `ops`
[INFO] [stdout]   |           |
[INFO] [stdout]   |           no `Generator` in `ops`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::ops::Generator`
[INFO] [stdout]  --> src/log/dso.rs:5:11
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::{ops::Generator, pin::Pin};
[INFO] [stdout]   |           ^^^^^^^^^^^^^^ no `Generator` in `ops`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::ops::Generator`
[INFO] [stdout]  --> src/log/swo.rs:5:11
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::{ops::Generator, pin::Pin};
[INFO] [stdout]   |           ^^^^^^^^^^^^^^ no `Generator` in `ops`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved imports `std::ops::Generator`, `std::ops::GeneratorState`
[INFO] [stdout]   --> src/log/mod.rs:14:11
[INFO] [stdout]    |
[INFO] [stdout] 14 |     ops::{Generator, GeneratorState},
[INFO] [stdout]    |           ^^^^^^^^^  ^^^^^^^^^^^^^^ no `GeneratorState` in `ops`
[INFO] [stdout]    |           |
[INFO] [stdout]    |           no `Generator` in `ops`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:28:1
[INFO] [stdout]    |
[INFO] [stdout] 28 | #![feature(bool_to_option)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:29:1
[INFO] [stdout]    |
[INFO] [stdout] 29 | #![feature(exhaustive_patterns)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:30:1
[INFO] [stdout]    |
[INFO] [stdout] 30 | #![feature(generator_trait)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:31:1
[INFO] [stdout]    |
[INFO] [stdout] 31 | #![feature(generators)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:32:1
[INFO] [stdout]    |
[INFO] [stdout] 32 | #![feature(never_type)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]    --> src/heap/trace.rs:187:21
[INFO] [stdout]     |
[INFO] [stdout] 187 |                     yield Packet::Alloc { size };
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]    --> src/heap/trace.rs:200:21
[INFO] [stdout]     |
[INFO] [stdout] 200 |                     yield Packet::Dealloc { size };
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]    --> src/heap/trace.rs:214:21
[INFO] [stdout]     |
[INFO] [stdout] 214 |                     yield Packet::Grow { old_size, new_size };
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]    --> src/heap/trace.rs:228:21
[INFO] [stdout]     |
[INFO] [stdout] 228 |                     yield Packet::Shrink { old_size, new_size };
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]   --> src/log/dso.rs:19:24
[INFO] [stdout]    |
[INFO] [stdout] 19 |                 byte = yield;
[INFO] [stdout]    |                        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]   --> src/log/dso.rs:23:34
[INFO] [stdout]    |
[INFO] [stdout] 23 |                     payload.push(yield);
[INFO] [stdout]    |                                  ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]   --> src/log/dso.rs:34:20
[INFO] [stdout]    |
[INFO] [stdout] 34 |             byte = yield;
[INFO] [stdout]    |                    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]   --> src/log/swo.rs:33:36
[INFO] [stdout]    |
[INFO] [stdout] 33 |                         let byte = yield;
[INFO] [stdout]    |                                    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]   --> src/log/swo.rs:57:36
[INFO] [stdout]    |
[INFO] [stdout] 57 |                         let byte = yield;
[INFO] [stdout]    |                                    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]   --> src/log/swo.rs:89:36
[INFO] [stdout]    |
[INFO] [stdout] 89 |                         let byte = yield;
[INFO] [stdout]    |                                    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]    --> src/log/swo.rs:114:38
[INFO] [stdout]     |
[INFO] [stdout] 114 |                         payload.push(yield);
[INFO] [stdout]     |                                      ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]    --> src/log/swo.rs:119:28
[INFO] [stdout]     |
[INFO] [stdout] 119 |                 bytes.push(yield);
[INFO] [stdout]     |                            ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]    --> src/heap/trace.rs:187:21
[INFO] [stdout]     |
[INFO] [stdout] 187 |                     yield Packet::Alloc { size };
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `yield` can only be used in `#[coroutine]` closures, or `gen` blocks
[INFO] [stdout]    --> src/heap/trace.rs:187:21
[INFO] [stdout]     |
[INFO] [stdout] 187 |                     yield Packet::Alloc { size };
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: use `#[coroutine]` to make this closure a coroutine
[INFO] [stdout]     |
[INFO] [stdout] 136 |     #[coroutine] static move || {
[INFO] [stdout]     |     ++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]    --> src/heap/trace.rs:200:21
[INFO] [stdout]     |
[INFO] [stdout] 200 |                     yield Packet::Dealloc { size };
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]    --> src/heap/trace.rs:214:21
[INFO] [stdout]     |
[INFO] [stdout] 214 |                     yield Packet::Grow { old_size, new_size };
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]    --> src/heap/trace.rs:228:21
[INFO] [stdout]     |
[INFO] [stdout] 228 |                     yield Packet::Shrink { old_size, new_size };
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]   --> src/log/dso.rs:19:24
[INFO] [stdout]    |
[INFO] [stdout] 19 |                 byte = yield;
[INFO] [stdout]    |                        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `yield` can only be used in `#[coroutine]` closures, or `gen` blocks
[INFO] [stdout]   --> src/log/dso.rs:19:24
[INFO] [stdout]    |
[INFO] [stdout] 19 |                 byte = yield;
[INFO] [stdout]    |                        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: use `#[coroutine]` to make this closure a coroutine
[INFO] [stdout]    |
[INFO] [stdout] 15 |     Box::pin(#[coroutine] static move |mut byte| {
[INFO] [stdout]    |              ++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]   --> src/log/dso.rs:23:34
[INFO] [stdout]    |
[INFO] [stdout] 23 |                     payload.push(yield);
[INFO] [stdout]    |                                  ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]   --> src/log/dso.rs:34:20
[INFO] [stdout]    |
[INFO] [stdout] 34 |             byte = yield;
[INFO] [stdout]    |                    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]   --> src/log/swo.rs:33:36
[INFO] [stdout]    |
[INFO] [stdout] 33 |                         let byte = yield;
[INFO] [stdout]    |                                    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `yield` can only be used in `#[coroutine]` closures, or `gen` blocks
[INFO] [stdout]   --> src/log/swo.rs:33:36
[INFO] [stdout]    |
[INFO] [stdout] 33 |                         let byte = yield;
[INFO] [stdout]    |                                    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: use `#[coroutine]` to make this closure a coroutine
[INFO] [stdout]    |
[INFO] [stdout] 25 |     Box::pin(#[coroutine] static move |byte: u8| {
[INFO] [stdout]    |              ++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]   --> src/log/swo.rs:57:36
[INFO] [stdout]    |
[INFO] [stdout] 57 |                         let byte = yield;
[INFO] [stdout]    |                                    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]   --> src/log/swo.rs:89:36
[INFO] [stdout]    |
[INFO] [stdout] 89 |                         let byte = yield;
[INFO] [stdout]    |                                    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]    --> src/log/swo.rs:114:38
[INFO] [stdout]     |
[INFO] [stdout] 114 |                         payload.push(yield);
[INFO] [stdout]     |                                      ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: yield syntax is experimental
[INFO] [stdout]    --> src/log/swo.rs:119:28
[INFO] [stdout]     |
[INFO] [stdout] 119 |                 bytes.push(yield);
[INFO] [stdout]     |                            ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `bool_to_option` has been stable since 1.62.0 and no longer requires an attribute to enable
[INFO] [stdout]   --> src/lib.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 | #![feature(bool_to_option)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `generator_trait`
[INFO] [stdout]   --> src/lib.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 | #![feature(generator_trait)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0554, E0557, E0635, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `drone` (lib) due to 38 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "0839c6c6934f917e32607f0113ac21a2ab50f76870ee0882463a84a7d2baa251", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0839c6c6934f917e32607f0113ac21a2ab50f76870ee0882463a84a7d2baa251", kill_on_drop: false }`
[INFO] [stdout] 0839c6c6934f917e32607f0113ac21a2ab50f76870ee0882463a84a7d2baa251
