[INFO] fetching crate flipdot 0.6.0...
[INFO] checking flipdot-0.6.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate flipdot 0.6.0 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate flipdot 0.6.0 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 crates.io crate flipdot 0.6.0
[INFO] finished tweaking crates.io crate flipdot 0.6.0
[INFO] tweaked toml for crates.io crate flipdot 0.6.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate crates.io crate flipdot 0.6.0 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]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded proc-macro2 v1.0.9
[INFO] [stderr]   Downloaded flipdot-testing v0.6.0
[INFO] [stderr]   Downloaded cfg-if v0.1.7
[INFO] [stderr]   Downloaded serial-windows v0.4.0
[INFO] [stderr]   Downloaded wincolor v1.0.1
[INFO] [stderr]   Downloaded termcolor v1.0.4
[INFO] [stderr]   Downloaded quote v1.0.3
[INFO] [stderr]   Downloaded serial v0.4.0
[INFO] [stderr]   Downloaded redox_syscall v0.1.52
[INFO] [stderr]   Downloaded quick-error v1.2.2
[INFO] [stderr]   Downloaded syn v1.0.16
[INFO] [stderr]   Downloaded flipdot-core v0.6.0
[INFO] [stderr]   Downloaded regex-syntax v0.6.17
[INFO] [stderr]   Downloaded libc v0.2.51
[INFO] [stderr]   Downloaded regex v1.3.7
[INFO] [stderr]   Downloaded thiserror-impl v1.0.16
[INFO] [stderr]   Downloaded thiserror v1.0.16
[INFO] [stderr]   Downloaded winapi v0.3.6
[INFO] [stderr]   Downloaded derive_more v0.99.5
[INFO] [stderr]   Downloaded flipdot-serial v0.6.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] de77ab4033e88e94afef32663dbd1cf2f81b6f62094c3b076ba3a776aeb13a82
[INFO] running `Command { std: "docker" "start" "-a" "de77ab4033e88e94afef32663dbd1cf2f81b6f62094c3b076ba3a776aeb13a82", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "de77ab4033e88e94afef32663dbd1cf2f81b6f62094c3b076ba3a776aeb13a82", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de77ab4033e88e94afef32663dbd1cf2f81b6f62094c3b076ba3a776aeb13a82", kill_on_drop: false }`
[INFO] [stdout] de77ab4033e88e94afef32663dbd1cf2f81b6f62094c3b076ba3a776aeb13a82
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 7a7198cb26cbe26a34253e1df66a034b1b878c359636a8aa2c042b6e2739cfdb
[INFO] running `Command { std: "docker" "start" "-a" "7a7198cb26cbe26a34253e1df66a034b1b878c359636a8aa2c042b6e2739cfdb", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.51
[INFO] [stderr]    Compiling proc-macro2 v1.0.9
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking regex-syntax v0.6.17
[INFO] [stderr]     Checking cfg-if v0.1.7
[INFO] [stderr]     Checking quick-error v1.2.2
[INFO] [stderr]     Checking termcolor v1.0.4
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]     Checking aho-corasick v0.7.10
[INFO] [stderr]     Checking serial-core v0.4.0
[INFO] [stderr]     Checking ioctl-rs v0.1.6
[INFO] [stderr]     Checking termios v0.2.2
[INFO] [stderr]     Checking atty v0.2.11
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]     Checking serial-unix v0.4.0
[INFO] [stderr]     Checking serial v0.4.0
[INFO] [stderr]     Checking regex v1.3.7
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]    Compiling thiserror-impl v1.0.16
[INFO] [stderr]    Compiling derive_more v0.99.5
[INFO] [stderr]     Checking thiserror v1.0.16
[INFO] [stderr]     Checking flipdot-core v0.6.0
[INFO] [stderr]     Checking flipdot-serial v0.6.0
[INFO] [stderr]     Checking flipdot-testing v0.6.0
[INFO] [stderr]     Checking flipdot v0.6.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.45s
[INFO] running `Command { std: "docker" "inspect" "7a7198cb26cbe26a34253e1df66a034b1b878c359636a8aa2c042b6e2739cfdb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7a7198cb26cbe26a34253e1df66a034b1b878c359636a8aa2c042b6e2739cfdb", kill_on_drop: false }`
[INFO] [stdout] 7a7198cb26cbe26a34253e1df66a034b1b878c359636a8aa2c042b6e2739cfdb
[INFO] checking flipdot-0.6.0 against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] extracting crate flipdot 0.6.0 into /workspace/builds/worker-0-tc2/source
[INFO] validating manifest of crates.io crate flipdot 0.6.0 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 crates.io crate flipdot 0.6.0
[INFO] finished tweaking crates.io crate flipdot 0.6.0
[INFO] tweaked toml for crates.io crate flipdot 0.6.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate crates.io crate flipdot 0.6.0 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-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 7ef1086418a169540ed393b735d54996824da0fb3b6e67e1a3f5433eb787e24e
[INFO] running `Command { std: "docker" "start" "-a" "7ef1086418a169540ed393b735d54996824da0fb3b6e67e1a3f5433eb787e24e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7ef1086418a169540ed393b735d54996824da0fb3b6e67e1a3f5433eb787e24e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7ef1086418a169540ed393b735d54996824da0fb3b6e67e1a3f5433eb787e24e", kill_on_drop: false }`
[INFO] [stdout] 7ef1086418a169540ed393b735d54996824da0fb3b6e67e1a3f5433eb787e24e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] bc8a2bfe569f36b71e1e122b16b921690d752804b8dc8d72be7390886b438cde
[INFO] running `Command { std: "docker" "start" "-a" "bc8a2bfe569f36b71e1e122b16b921690d752804b8dc8d72be7390886b438cde", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.51
[INFO] [stderr]    Compiling proc-macro2 v1.0.9
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking regex-syntax v0.6.17
[INFO] [stderr]     Checking cfg-if v0.1.7
[INFO] [stderr]     Checking quick-error v1.2.2
[INFO] [stderr]     Checking termcolor v1.0.4
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]     Checking aho-corasick v0.7.10
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]     Checking serial-core v0.4.0
[INFO] [stderr]     Checking termios v0.2.2
[INFO] [stderr]     Checking ioctl-rs v0.1.6
[INFO] [stderr]     Checking atty v0.2.11
[INFO] [stderr]     Checking serial-unix v0.4.0
[INFO] [stderr]     Checking serial v0.4.0
[INFO] [stderr]     Checking regex v1.3.7
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]    Compiling thiserror-impl v1.0.16
[INFO] [stderr]    Compiling derive_more v0.99.5
[INFO] [stderr]     Checking thiserror v1.0.16
[INFO] [stderr]     Checking flipdot-core v0.6.0
[INFO] [stderr]     Checking flipdot-serial v0.6.0
[INFO] [stderr]     Checking flipdot-testing v0.6.0
[INFO] [stderr]     Checking flipdot v0.6.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.89s
[INFO] running `Command { std: "docker" "inspect" "bc8a2bfe569f36b71e1e122b16b921690d752804b8dc8d72be7390886b438cde", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bc8a2bfe569f36b71e1e122b16b921690d752804b8dc8d72be7390886b438cde", kill_on_drop: false }`
[INFO] [stdout] bc8a2bfe569f36b71e1e122b16b921690d752804b8dc8d72be7390886b438cde