[INFO] cloning repository https://github.com/chmln/fut-err
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/chmln/fut-err" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchmln%2Ffut-err", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchmln%2Ffut-err'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 97947046d157aa1c901118c1f25848dbb4d50ed5
[INFO] checking chmln/fut-err against master#a609fb45efad59dfd459c76e50899be9f0583b5a for pr-80579
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchmln%2Ffut-err" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/chmln/fut-err on toolchain a609fb45efad59dfd459c76e50899be9f0583b5a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/chmln/fut-err
[INFO] finished tweaking git repo https://github.com/chmln/fut-err
[INFO] tweaked toml for git repo https://github.com/chmln/fut-err written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/chmln/fut-err already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f6fb4df398f7dbef2a4ccf8effd992b523d315b19260921978b5aa5a9bbcfbe4
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "f6fb4df398f7dbef2a4ccf8effd992b523d315b19260921978b5aa5a9bbcfbe4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f6fb4df398f7dbef2a4ccf8effd992b523d315b19260921978b5aa5a9bbcfbe4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f6fb4df398f7dbef2a4ccf8effd992b523d315b19260921978b5aa5a9bbcfbe4", kill_on_drop: false }`
[INFO] [stdout] f6fb4df398f7dbef2a4ccf8effd992b523d315b19260921978b5aa5a9bbcfbe4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "check" "--frozen" "--all" "--all-targets" "--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] 11eb8aea9b06cfadf8c497a8bcff49b05a94d2ec9a79f20560212d41bf69578e
[INFO] running `Command { std: "docker" "start" "-a" "11eb8aea9b06cfadf8c497a8bcff49b05a94d2ec9a79f20560212d41bf69578e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v0.1.2
[INFO] [stderr]     Checking rand_core v0.4.0
[INFO] [stderr]    Compiling libc v0.2.51
[INFO] [stderr]    Compiling proc-macro2 v0.4.27
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.32
[INFO] [stderr]     Checking either v1.5.2
[INFO] [stderr]     Checking pin-utils v0.1.0-alpha.4
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.14
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking rand_jitter v0.1.3
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.14
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.14
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking num_cpus v1.10.0
[INFO] [stderr]     Checking futures-io-preview v0.3.0-alpha.14
[INFO] [stderr]    Compiling quote v0.6.12
[INFO] [stderr]    Compiling proc-macro-hack v0.5.5
[INFO] [stderr]    Compiling futures-select-macro-preview v0.3.0-alpha.14
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.14
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/futures-util-preview-0.3.0-alpha.14/src/lib.rs:6:51
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![cfg_attr(feature = "std", feature(async_await, await_macro))]
[INFO] [stdout]   |                                                   ^^^^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: subsumed by `.await` syntax
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0557`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `futures-util-preview`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "11eb8aea9b06cfadf8c497a8bcff49b05a94d2ec9a79f20560212d41bf69578e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "11eb8aea9b06cfadf8c497a8bcff49b05a94d2ec9a79f20560212d41bf69578e", kill_on_drop: false }`
[INFO] [stdout] 11eb8aea9b06cfadf8c497a8bcff49b05a94d2ec9a79f20560212d41bf69578e