[INFO] cloning repository https://github.com/PvdBerg1998/futures-executor
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/PvdBerg1998/futures-executor" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPvdBerg1998%2Ffutures-executor"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPvdBerg1998%2Ffutures-executor'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1c8ac9c99af48a0cff0cfc399f2943858863eafa
[INFO] checking PvdBerg1998/futures-executor against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPvdBerg1998%2Ffutures-executor" "/workspace/builds/worker-1/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/PvdBerg1998/futures-executor on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/PvdBerg1998/futures-executor
[INFO] finished tweaking git repo https://github.com/PvdBerg1998/futures-executor
[INFO] tweaked toml for git repo https://github.com/PvdBerg1998/futures-executor written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/PvdBerg1998/futures-executor already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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=forbid" "-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" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] a83cfeb0b9de6acb656c56f01d142c04315536e9fbbec2c57756afdad56b7d04
[INFO] running `"docker" "start" "-a" "a83cfeb0b9de6acb656c56f01d142c04315536e9fbbec2c57756afdad56b7d04"`
[INFO] [stderr]     Checking slotmap v0.4.0
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking num_cpus v1.10.1
[INFO] [stderr]     Checking crossbeam-channel v0.3.9
[INFO] [stderr]     Checking futures-executor-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking futures-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking futures-threadpool v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0425]: cannot find function `empty` in module `future`
[INFO] [stderr]   --> src/tests.rs:89:26
[INFO] [stderr]    |
[INFO] [stderr] 89 |     handle.spawn(future::empty()).unwrap();
[INFO] [stderr]    |                          ^^^^^ not found in `future`
[INFO] [stderr] help: possible candidates are found in other modules, you can import them into scope
[INFO] [stderr]    |
[INFO] [stderr] 1  | use core::iter::empty;
[INFO] [stderr]    |
[INFO] [stderr] 1  | use futures::core_reexport::iter::empty;
[INFO] [stderr]    |
[INFO] [stderr] 1  | use futures::io::empty;
[INFO] [stderr]    |
[INFO] [stderr] 1  | use futures::stream::empty;
[INFO] [stderr]    |
[INFO] [stderr] and 3 other candidates
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0425`.
[INFO] [stderr] error: could not compile `futures-threadpool`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "a83cfeb0b9de6acb656c56f01d142c04315536e9fbbec2c57756afdad56b7d04"`
[INFO] running `"docker" "rm" "-f" "a83cfeb0b9de6acb656c56f01d142c04315536e9fbbec2c57756afdad56b7d04"`
[INFO] [stdout] a83cfeb0b9de6acb656c56f01d142c04315536e9fbbec2c57756afdad56b7d04