[INFO] updating cached repository https://github.com/FTP-rs/ftp-server-iold-rs
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 37558eaf69d09d65141d3cf8649eba78ccc95b51
[INFO] testing FTP-rs/ftp-server-iold-rs against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFTP-rs%2Fftp-server-iold-rs" "/workspace/builds/worker-2/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/FTP-rs/ftp-server-iold-rs on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/FTP-rs/ftp-server-iold-rs
[INFO] finished tweaking git repo https://github.com/FTP-rs/ftp-server-iold-rs
[INFO] tweaked toml for git repo https://github.com/FTP-rs/ftp-server-iold-rs written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/FTP-rs/ftp-server-iold-rs already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "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=warn" "-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" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 4a62b8eb596b1f0e0b3875262d8addf12cbb5e245f66de4fc0c9cece66c9f8fa
[INFO] running `"docker" "start" "-a" "4a62b8eb596b1f0e0b3875262d8addf12cbb5e245f66de4fc0c9cece66c9f8fa"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling iold v0.1.0 (https://github.com/antoyo/iold#47f28d46)
[INFO] [stderr]    Compiling serde_derive v1.0.27
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]   --> /opt/rustwide/cargo-home/git/checkouts/iold-7ce8c4fe751820af/47f28d4/src/lib.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | #![feature(generators, generator_trait)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `resume` found for struct `std::boxed::Box<(dyn std::ops::Generator<Yield = YieldValue, Return = ()> + 'static)>` in the current scope
[INFO] [stderr]    --> /opt/rustwide/cargo-home/git/checkouts/iold-7ce8c4fe751820af/47f28d4/src/lib.rs:307:38
[INFO] [stderr]     |
[INFO] [stderr] 307 |             match unsafe { generator.resume() } {
[INFO] [stderr]     |                                      ^^^^^^ method not found in `std::boxed::Box<(dyn std::ops::Generator<Yield = YieldValue, Return = ()> + 'static)>`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `resume` found for type parameter `G` in the current scope
[INFO] [stderr]    --> /opt/rustwide/cargo-home/git/checkouts/iold-7ce8c4fe751820af/47f28d4/src/lib.rs:325:38
[INFO] [stderr]     |
[INFO] [stderr] 325 |             match unsafe { generator.resume() } {
[INFO] [stderr]     |                                      ^^^^^^ method not found in `G`
[INFO] [stderr]     |
[INFO] [stderr]     = help: items from traits can only be used if the type parameter is bounded by the trait
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `resume` found for struct `std::boxed::Box<dyn std::ops::Generator<Yield = YieldValue, Return = ()>>` in the current scope
[INFO] [stderr]    --> /opt/rustwide/cargo-home/git/checkouts/iold-7ce8c4fe751820af/47f28d4/src/lib.rs:335:49
[INFO] [stderr]     |
[INFO] [stderr] 335 | ...                   match unsafe { task.resume() ...
[INFO] [stderr]     |                                           ^^^^^^ method not found in `std::boxed::Box<dyn std::ops::Generator<Yield = YieldValue, Return = ()>>`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `iold`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "4a62b8eb596b1f0e0b3875262d8addf12cbb5e245f66de4fc0c9cece66c9f8fa"`
[INFO] running `"docker" "rm" "-f" "4a62b8eb596b1f0e0b3875262d8addf12cbb5e245f66de4fc0c9cece66c9f8fa"`
[INFO] [stdout] 4a62b8eb596b1f0e0b3875262d8addf12cbb5e245f66de4fc0c9cece66c9f8fa