[INFO] crate pin-rc 0.1.0 is already in cache
[INFO] testing pin-rc-0.1.0 against 1.44.0 for beta-1.45-1
[INFO] extracting crate pin-rc 0.1.0 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate pin-rc 0.1.0 on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate pin-rc 0.1.0
[INFO] finished tweaking crates.io crate pin-rc 0.1.0
[INFO] tweaked toml for crates.io crate pin-rc 0.1.0 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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-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" "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] 538b19abc85f7937d75306dc6fc9326a19ec3cdb31fc73d7171f337919d398a9
[INFO] running `"docker" "start" "-a" "538b19abc85f7937d75306dc6fc9326a19ec3cdb31fc73d7171f337919d398a9"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling pin-rc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0432]: unresolved import `std::mem::Pin`
[INFO] [stderr]  --> src/pin_rc.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::mem::Pin;
[INFO] [stderr]   |     ^^^^^^^^^^^^^ no `Pin` in `mem`
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `std::mem::Pin`
[INFO] [stderr]  --> src/pin_arc.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::mem::Pin;
[INFO] [stderr]   |     ^^^^^^^^^^^^^ no `Pin` in `mem`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(pin)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: yield syntax is experimental
[INFO] [stderr]   --> src/lib.rs:34:17
[INFO] [stderr]    |
[INFO] [stderr] 34 |                 yield i;
[INFO] [stderr]    |                 ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: yield syntax is experimental
[INFO] [stderr]   --> src/lib.rs:50:17
[INFO] [stderr]    |
[INFO] [stderr] 50 |                 yield i;
[INFO] [stderr]    |                 ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 5 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0432, E0554, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0432`.
[INFO] [stderr] error: could not compile `pin-rc`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "538b19abc85f7937d75306dc6fc9326a19ec3cdb31fc73d7171f337919d398a9"`
[INFO] running `"docker" "rm" "-f" "538b19abc85f7937d75306dc6fc9326a19ec3cdb31fc73d7171f337919d398a9"`
[INFO] [stdout] 538b19abc85f7937d75306dc6fc9326a19ec3cdb31fc73d7171f337919d398a9