[INFO] cloning repository https://github.com/rutaihwa/05_future_uses_examples [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rutaihwa/05_future_uses_examples" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frutaihwa%2F05_future_uses_examples", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frutaihwa%2F05_future_uses_examples'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] b7528afd9a334e2d6f2df0522790a05f66fea3a3 [INFO] checking rutaihwa/05_future_uses_examples against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frutaihwa%2F05_future_uses_examples" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/rutaihwa/05_future_uses_examples on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/rutaihwa/05_future_uses_examples [INFO] finished tweaking git repo https://github.com/rutaihwa/05_future_uses_examples [INFO] tweaked toml for git repo https://github.com/rutaihwa/05_future_uses_examples written to /workspace/builds/worker-6-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/rutaihwa/05_future_uses_examples already has a lockfile, it will not be regenerated [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded tokio-executor v0.1.8 [INFO] [stderr] Downloaded lock_api v0.3.1 [INFO] [stderr] Downloaded tokio-reactor v0.1.10 [INFO] [stderr] Downloaded tokio-udp v0.1.5 [INFO] [stderr] Downloaded syn v1.0.8 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 71851489d0eb05a4c242094b717f9a0568d0cfb2e2552e3b4081c03177a02c6a [INFO] running `Command { std: "docker" "start" "-a" "71851489d0eb05a4c242094b717f9a0568d0cfb2e2552e3b4081c03177a02c6a", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "71851489d0eb05a4c242094b717f9a0568d0cfb2e2552e3b4081c03177a02c6a", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "71851489d0eb05a4c242094b717f9a0568d0cfb2e2552e3b4081c03177a02c6a", kill_on_drop: false }` [INFO] [stdout] 71851489d0eb05a4c242094b717f9a0568d0cfb2e2552e3b4081c03177a02c6a [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 43313424b131c064694c4f615c2cb51df496b6b2ca80aed0dfac81e6a388fbf5 [INFO] running `Command { std: "docker" "start" "-a" "43313424b131c064694c4f615c2cb51df496b6b2ca80aed0dfac81e6a388fbf5", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.65 [INFO] [stderr] Compiling semver-parser v0.7.0 [INFO] [stderr] Compiling log v0.4.8 [INFO] [stderr] Checking futures v0.1.29 [INFO] [stderr] Compiling byteorder v1.3.2 [INFO] [stderr] Checking scopeguard v1.0.0 [INFO] [stderr] Compiling maybe-uninit v2.0.0 [INFO] [stderr] Checking crossbeam-utils v0.6.6 [INFO] [stderr] Checking slab v0.4.2 [INFO] [stderr] Compiling semver v0.9.0 [INFO] [stderr] Compiling autocfg v0.1.7 [INFO] [stderr] Compiling proc-macro2 v1.0.6 [INFO] [stderr] Compiling rustc_version v0.2.3 [INFO] [stderr] Checking smallvec v0.6.13 [INFO] [stderr] Checking lock_api v0.3.1 [INFO] [stderr] Compiling parking_lot_core v0.6.2 [INFO] [stderr] Compiling crossbeam-utils v0.7.0 [INFO] [stderr] Compiling memoffset v0.5.3 [INFO] [stderr] Compiling parking_lot v0.9.0 [INFO] [stderr] Compiling crossbeam-epoch v0.8.0 [INFO] [stderr] Checking fnv v1.0.6 [INFO] [stderr] Compiling unicode-xid v0.2.0 [INFO] [stderr] Compiling cc v1.0.47 [INFO] [stderr] Compiling syn v1.0.8 [INFO] [stderr] Checking iovec v0.1.4 [INFO] [stderr] Checking net2 v0.2.33 [INFO] [stderr] Checking num_cpus v1.11.1 [INFO] [stderr] Checking bytes v0.4.12 [INFO] [stderr] Checking mio v0.6.19 [INFO] [stderr] Compiling quote v1.0.2 [INFO] [stderr] Checking crossbeam-queue v0.1.2 [INFO] [stderr] Checking tokio-executor v0.1.8 [INFO] [stderr] Checking tokio-io v0.1.12 [INFO] [stderr] Checking tokio-sync v0.1.7 [INFO] [stderr] Checking crossbeam-deque v0.7.2 [INFO] [stderr] Compiling failure_derive v0.1.6 [INFO] [stderr] Checking rustc-demangle v0.1.16 [INFO] [stderr] Checking mio-uds v0.6.7 [INFO] [stderr] Checking tokio-threadpool v0.1.16 [INFO] [stderr] Checking tokio-codec v0.1.1 [INFO] [stderr] Checking tokio-timer v0.2.11 [INFO] [stderr] Checking tokio-reactor v0.1.10 [INFO] [stderr] Checking tokio-current-thread v0.1.6 [INFO] [stderr] Compiling backtrace-sys v0.1.32 [INFO] [stderr] Checking tokio-fs v0.1.6 [INFO] [stderr] Checking tokio-tcp v0.1.3 [INFO] [stderr] Checking tokio-udp v0.1.5 [INFO] [stderr] Checking tokio-uds v0.2.5 [INFO] [stderr] Checking tokio v0.1.22 [INFO] [stderr] Checking backtrace v0.3.40 [INFO] [stderr] Compiling synstructure v0.12.3 [INFO] [stderr] Checking failure v0.1.6 [INFO] [stderr] Checking futures v0.1.0 (/opt/rustwide/workdir) [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 17.93s [INFO] running `Command { std: "docker" "inspect" "43313424b131c064694c4f615c2cb51df496b6b2ca80aed0dfac81e6a388fbf5", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "43313424b131c064694c4f615c2cb51df496b6b2ca80aed0dfac81e6a388fbf5", kill_on_drop: false }` [INFO] [stdout] 43313424b131c064694c4f615c2cb51df496b6b2ca80aed0dfac81e6a388fbf5 [INFO] checking rutaihwa/05_future_uses_examples against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frutaihwa%2F05_future_uses_examples" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/rutaihwa/05_future_uses_examples on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/rutaihwa/05_future_uses_examples [INFO] finished tweaking git repo https://github.com/rutaihwa/05_future_uses_examples [INFO] tweaked toml for git repo https://github.com/rutaihwa/05_future_uses_examples written to /workspace/builds/worker-6-tc2/source/Cargo.toml [INFO] crate git repo https://github.com/rutaihwa/05_future_uses_examples already has a lockfile, it will not be regenerated [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 80515905e4959812051e4086c857861a79334708cf2b0035db4165552719d95a [INFO] running `Command { std: "docker" "start" "-a" "80515905e4959812051e4086c857861a79334708cf2b0035db4165552719d95a", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "80515905e4959812051e4086c857861a79334708cf2b0035db4165552719d95a", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "80515905e4959812051e4086c857861a79334708cf2b0035db4165552719d95a", kill_on_drop: false }` [INFO] [stdout] 80515905e4959812051e4086c857861a79334708cf2b0035db4165552719d95a [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] e8b075aadb2bee349ca4025d43ac2bb45457dc3cb7f978764b7f67b0e1ad7e0a [INFO] running `Command { std: "docker" "start" "-a" "e8b075aadb2bee349ca4025d43ac2bb45457dc3cb7f978764b7f67b0e1ad7e0a", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.65 [INFO] [stderr] Compiling semver-parser v0.7.0 [INFO] [stderr] Checking futures v0.1.29 [INFO] [stderr] Compiling log v0.4.8 [INFO] [stderr] Compiling byteorder v1.3.2 [INFO] [stderr] Checking scopeguard v1.0.0 [INFO] [stderr] Compiling maybe-uninit v2.0.0 [INFO] [stderr] Checking crossbeam-utils v0.6.6 [INFO] [stderr] Checking slab v0.4.2 [INFO] [stderr] Compiling autocfg v0.1.7 [INFO] [stderr] Compiling semver v0.9.0 [INFO] [stderr] Compiling proc-macro2 v1.0.6 [INFO] [stderr] Checking lock_api v0.3.1 [INFO] [stderr] Checking smallvec v0.6.13 [INFO] [stderr] Compiling rustc_version v0.2.3 [INFO] [stderr] Compiling crossbeam-utils v0.7.0 [INFO] [stderr] Compiling crossbeam-epoch v0.8.0 [INFO] [stderr] Checking fnv v1.0.6 [INFO] [stderr] Compiling unicode-xid v0.2.0 [INFO] [stderr] Compiling cc v1.0.47 [INFO] [stderr] Compiling syn v1.0.8 [INFO] [stderr] Compiling parking_lot_core v0.6.2 [INFO] [stderr] Compiling memoffset v0.5.3 [INFO] [stderr] Compiling parking_lot v0.9.0 [INFO] [stderr] Checking iovec v0.1.4 [INFO] [stderr] Checking net2 v0.2.33 [INFO] [stderr] Checking bytes v0.4.12 [INFO] [stderr] Checking num_cpus v1.11.1 [INFO] [stderr] Checking mio v0.6.19 [INFO] [stderr] Checking crossbeam-queue v0.1.2 [INFO] [stderr] Compiling failure_derive v0.1.6 [INFO] [stderr] Checking rustc-demangle v0.1.16 [INFO] [stderr] Checking tokio-executor v0.1.8 [INFO] [stderr] Checking tokio-io v0.1.12 [INFO] [stderr] Checking tokio-sync v0.1.7 [INFO] [stderr] Checking mio-uds v0.6.7 [INFO] [stderr] Checking tokio-timer v0.2.11 [INFO] [stderr] Checking tokio-current-thread v0.1.6 [INFO] [stderr] Compiling quote v1.0.2 [INFO] [stderr] Compiling backtrace-sys v0.1.32 [INFO] [stderr] Checking crossbeam-deque v0.7.2 [INFO] [stderr] Checking tokio-threadpool v0.1.16 [INFO] [stderr] Checking tokio-reactor v0.1.10 [INFO] [stderr] Checking tokio-codec v0.1.1 [INFO] [stderr] Checking tokio-uds v0.2.5 [INFO] [stderr] Checking tokio-udp v0.1.5 [INFO] [stderr] Checking tokio-tcp v0.1.3 [INFO] [stderr] Checking tokio-fs v0.1.6 [INFO] [stderr] Checking tokio v0.1.22 [INFO] [stderr] Checking backtrace v0.3.40 [INFO] [stderr] Compiling synstructure v0.12.3 [INFO] [stderr] Checking failure v0.1.6 [INFO] [stderr] Checking futures v0.1.0 (/opt/rustwide/workdir) [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 20.10s [INFO] running `Command { std: "docker" "inspect" "e8b075aadb2bee349ca4025d43ac2bb45457dc3cb7f978764b7f67b0e1ad7e0a", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "e8b075aadb2bee349ca4025d43ac2bb45457dc3cb7f978764b7f67b0e1ad7e0a", kill_on_drop: false }` [INFO] [stdout] e8b075aadb2bee349ca4025d43ac2bb45457dc3cb7f978764b7f67b0e1ad7e0a