[INFO] fetching crate core-futures-stateless 0.1.0...
[INFO] testing core-futures-stateless-0.1.0 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate core-futures-stateless 0.1.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate core-futures-stateless 0.1.0 on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate core-futures-stateless 0.1.0
[INFO] finished tweaking crates.io crate core-futures-stateless 0.1.0
[INFO] tweaked toml for crates.io crate core-futures-stateless 0.1.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "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] e7e7479b903f02ce2b2e45174eb6e3b0908c435d76b7a76331a36b0d4ad94790
[INFO] running `Command { std: "docker" "start" "-a" "e7e7479b903f02ce2b2e45174eb6e3b0908c435d76b7a76331a36b0d4ad94790", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e7e7479b903f02ce2b2e45174eb6e3b0908c435d76b7a76331a36b0d4ad94790", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e7e7479b903f02ce2b2e45174eb6e3b0908c435d76b7a76331a36b0d4ad94790", kill_on_drop: false }`
[INFO] [stdout] e7e7479b903f02ce2b2e45174eb6e3b0908c435d76b7a76331a36b0d4ad94790
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "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] 6e54ab2523280013abb2a4add7d2b63216b363c9a97659b63598cbd12bade422
[INFO] running `Command { std: "docker" "start" "-a" "6e54ab2523280013abb2a4add7d2b63216b363c9a97659b63598cbd12bade422", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling core-futures-stateless v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:2:29
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(generator_trait, optin_builtin_traits)]
[INFO] [stdout]   |                             ^^^^^^^^^^^^^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: renamed to `auto_traits`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(generator_trait, optin_builtin_traits)]
[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/future.rs:15:32
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl<T: Generator<Yield = ()>> !Unpin for GenFuture<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[E0061]: this function takes 1 argument but 0 arguments were supplied
[INFO] [stdout]   --> src/future.rs:22:43
[INFO] [stdout]    |
[INFO] [stdout] 22 |         set_task_context(cx, || match gen.resume() {
[INFO] [stdout]    |                                           ^^^^^^- supplied 0 arguments
[INFO] [stdout]    |
[INFO] [stdout] help: expected the unit value `()`; create it with empty parentheses
[INFO] [stdout]    |
[INFO] [stdout] 22 |         set_task_context(cx, || match gen.resume(()) {
[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: E0061, E0554, E0557, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0061`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `core-futures-stateless`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "6e54ab2523280013abb2a4add7d2b63216b363c9a97659b63598cbd12bade422", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6e54ab2523280013abb2a4add7d2b63216b363c9a97659b63598cbd12bade422", kill_on_drop: false }`
[INFO] [stdout] 6e54ab2523280013abb2a4add7d2b63216b363c9a97659b63598cbd12bade422