[INFO] fetching crate futures-await 0.1.1...
[INFO] testing futures-await-0.1.1 against try#ecabaf78506b7a4668d42dc20268c086b93f0fad for pr-87041
[INFO] extracting crate futures-await 0.1.1 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate futures-await 0.1.1 on toolchain ecabaf78506b7a4668d42dc20268c086b93f0fad
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ecabaf78506b7a4668d42dc20268c086b93f0fad" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate futures-await 0.1.1
[INFO] finished tweaking crates.io crate futures-await 0.1.1
[INFO] tweaked toml for crates.io crate futures-await 0.1.1 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ecabaf78506b7a4668d42dc20268c086b93f0fad" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ecabaf78506b7a4668d42dc20268c086b93f0fad" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ecabaf78506b7a4668d42dc20268c086b93f0fad" "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] f086386e063337e547e893a0d7379190b98056a0dfb22de315b0ac90cea62d9b
[INFO] running `Command { std: "docker" "start" "-a" "f086386e063337e547e893a0d7379190b98056a0dfb22de315b0ac90cea62d9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f086386e063337e547e893a0d7379190b98056a0dfb22de315b0ac90cea62d9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f086386e063337e547e893a0d7379190b98056a0dfb22de315b0ac90cea62d9b", kill_on_drop: false }`
[INFO] [stdout] f086386e063337e547e893a0d7379190b98056a0dfb22de315b0ac90cea62d9b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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=forbid" "-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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ecabaf78506b7a4668d42dc20268c086b93f0fad" "build" "--frozen" "--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] 4b184e3f5b8ac170e74f1657400415fa6d92d11eed04f91a943f53dac74ea151
[INFO] running `Command { std: "docker" "start" "-a" "4b184e3f5b8ac170e74f1657400415fa6d92d11eed04f91a943f53dac74ea151", kill_on_drop: false }`
[INFO] [stderr]    Compiling futures-await v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]   --> src/lib.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 | #![feature(on_unimplemented)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^ feature has been removed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: this is an internal attribute that will never be stable
[INFO] [stdout]   --> src/lib.rs:64:5
[INFO] [stdout]    |
[INFO] [stdout] 64 | /     #[rustc_on_unimplemented = "async functions must return a `Result` or \
[INFO] [stdout] 65 | |                                 a typedef of `Result`"]
[INFO] [stdout]    | |_______________________________________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: ambiguous associated item
[INFO] [stdout]    --> src/lib.rs:76:40
[INFO] [stdout]     |
[INFO] [stdout] 76  |         fn into_result(self) -> Result<Self::Ok, Self::Err> { self }
[INFO] [stdout]     |                                        ^^^^^^^^ help: use fully-qualified syntax: `<Result<T, E> as IsResult>::Ok`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[deny(ambiguous_associated_items)]` on by default
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = note: for more information, see issue #57644 <https://github.com/rust-lang/rust/issues/57644>
[INFO] [stdout] note: `Ok` could refer to the variant defined here
[INFO] [stdout] note: `Ok` could also refer to the associated type defined here
[INFO] [stdout]    --> src/lib.rs:67:9
[INFO] [stdout]     |
[INFO] [stdout] 67  |         type Ok;
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: ambiguous associated item
[INFO] [stdout]    --> src/lib.rs:76:50
[INFO] [stdout]     |
[INFO] [stdout] 76  |         fn into_result(self) -> Result<Self::Ok, Self::Err> { self }
[INFO] [stdout]     |                                                  ^^^^^^^^^ help: use fully-qualified syntax: `<Result<T, E> as IsResult>::Err`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = note: for more information, see issue #57644 <https://github.com/rust-lang/rust/issues/57644>
[INFO] [stdout] note: `Err` could refer to the variant defined here
[INFO] [stdout] note: `Err` could also refer to the associated type defined here
[INFO] [stdout]    --> src/lib.rs:68:9
[INFO] [stdout]     |
[INFO] [stdout] 68  |         type Err;
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0557, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0557`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `futures-await`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "4b184e3f5b8ac170e74f1657400415fa6d92d11eed04f91a943f53dac74ea151", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4b184e3f5b8ac170e74f1657400415fa6d92d11eed04f91a943f53dac74ea151", kill_on_drop: false }`
[INFO] [stdout] 4b184e3f5b8ac170e74f1657400415fa6d92d11eed04f91a943f53dac74ea151