[INFO] updating cached repository https://github.com/tkmct/future-sample
[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] 7a39152d7473ddd9da6b899de074febbe6e2e053
[INFO] checking tkmct/future-sample against try#1a608893c03d7722effeb0058e82770bd36b4b3c for pr-66504-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftkmct%2Ffuture-sample" "/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/tkmct/future-sample on toolchain 1a608893c03d7722effeb0058e82770bd36b4b3c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/tkmct/future-sample
[INFO] finished tweaking git repo https://github.com/tkmct/future-sample
[INFO] tweaked toml for git repo https://github.com/tkmct/future-sample written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/tkmct/future-sample already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "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=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" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "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] bc61e683cc2bd2040d68ba58ee8420ac71d08fc9070d345510b60d23090ad3e5
[INFO] running `"docker" "start" "-a" "bc61e683cc2bd2040d68ba58ee8420ac71d08fc9070d345510b60d23090ad3e5"`
[INFO] [stderr]     Checking rustc-hex v2.0.1
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]     Checking tokio-timer v0.1.2
[INFO] [stderr]     Checking rand_chacha v0.1.1
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking crossbeam-epoch v0.7.1
[INFO] [stderr]     Checking tiny-keccak v1.4.3
[INFO] [stderr]     Checking tokio-io v0.1.12
[INFO] [stderr]     Checking hyper v0.10.16
[INFO] [stderr]    Compiling derive_more v0.14.1
[INFO] [stderr]     Checking impl-serde v0.2.0
[INFO] [stderr]     Checking ethereum-types-serialize v0.2.2
[INFO] [stderr]     Checking jsonrpc-core v11.0.0
[INFO] [stderr]     Checking rlp v0.4.0
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking impl-rlp v0.2.0
[INFO] [stderr]     Checking crossbeam-deque v0.7.1
[INFO] [stderr]     Checking uint v0.5.0
[INFO] [stderr]     Checking tokio-codec v0.1.1
[INFO] [stderr]     Checking h2 v0.1.23
[INFO] [stderr]     Checking tokio-tls v0.2.1
[INFO] [stderr]     Checking fixed-hash v0.3.2
[INFO] [stderr]     Checking parking_lot_core v0.4.0
[INFO] [stderr]     Checking tokio-threadpool v0.1.14
[INFO] [stderr]     Checking ethbloom v0.6.4
[INFO] [stderr]     Checking parking_lot v0.7.1
[INFO] [stderr]     Checking tokio-fs v0.1.6
[INFO] [stderr]     Checking tokio-reactor v0.1.9
[INFO] [stderr]     Checking ethereum-types v0.5.2
[INFO] [stderr]     Checking tokio-tcp v0.1.3
[INFO] [stderr]     Checking tokio-udp v0.1.3
[INFO] [stderr]     Checking tokio-uds v0.2.5
[INFO] [stderr]     Checking tokio v0.1.21
[INFO] [stderr]     Checking ethabi v7.0.0
[INFO] [stderr]     Checking tokio-core v0.1.17
[INFO] [stderr]     Checking hyper v0.12.29
[INFO] [stderr]     Checking websocket v0.21.1
[INFO] [stderr]     Checking tokio-uds v0.1.7
[INFO] [stderr]     Checking hyper-tls v0.3.2
[INFO] [stderr]     Checking web3 v0.7.0 (https://github.com/tomusdrw/rust-web3#21cb38c7)
[INFO] [stderr]     Checking future-sample v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/event_watcher.rs:160:9
[INFO] [stderr]     |
[INFO] [stderr] 146 | /         loop {
[INFO] [stderr] 147 | |             let logs = match try_ready!(self.stream.poll()) {
[INFO] [stderr] 148 | |                 Some(value) => value,
[INFO] [stderr] 149 | |                 None => continue,
[INFO] [stderr] ...   |
[INFO] [stderr] 157 | |             }
[INFO] [stderr] 158 | |         }
[INFO] [stderr]     | |_________- any code following this expression is unreachable
[INFO] [stderr] 159 | 
[INFO] [stderr] 160 |           Ok(Async::Ready(()))
[INFO] [stderr]     |           ^^^^^^^^^^^^^^^^^^^^ unreachable expression
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/event_watcher.rs:160:9
[INFO] [stderr]     |
[INFO] [stderr] 146 | /         loop {
[INFO] [stderr] 147 | |             let logs = match try_ready!(self.stream.poll()) {
[INFO] [stderr] 148 | |                 Some(value) => value,
[INFO] [stderr] 149 | |                 None => continue,
[INFO] [stderr] ...   |
[INFO] [stderr] 157 | |             }
[INFO] [stderr] 158 | |         }
[INFO] [stderr]     | |_________- any code following this expression is unreachable
[INFO] [stderr] 159 | 
[INFO] [stderr] 160 |           Ok(Async::Ready(()))
[INFO] [stderr]     |           ^^^^^^^^^^^^^^^^^^^^ unreachable expression
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 24s
[INFO] running `"docker" "inspect" "bc61e683cc2bd2040d68ba58ee8420ac71d08fc9070d345510b60d23090ad3e5"`
[INFO] running `"docker" "rm" "-f" "bc61e683cc2bd2040d68ba58ee8420ac71d08fc9070d345510b60d23090ad3e5"`
[INFO] [stdout] bc61e683cc2bd2040d68ba58ee8420ac71d08fc9070d345510b60d23090ad3e5