[INFO] fetching crate iwls 0.0.3...
[INFO] checking iwls-0.0.3 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate iwls 0.0.3 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate iwls 0.0.3 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 iwls 0.0.3
[INFO] finished tweaking crates.io crate iwls 0.0.3
[INFO] tweaked toml for crates.io crate iwls 0.0.3 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate iwls 0.0.3 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]  Downloading crates ...
[INFO] [stderr]   Downloaded autocfg v0.1.6
[INFO] [stderr]   Downloaded wifiscanner v0.5.1
[INFO] [stderr]   Downloaded either v1.5.3
[INFO] [stderr]   Downloaded order-stat v0.1.3
[INFO] [stderr]   Downloaded users v0.9.1
[INFO] [stderr]   Downloaded approx v0.3.2
[INFO] [stderr]   Downloaded num-integer v0.1.41
[INFO] [stderr]   Downloaded num-rational v0.2.2
[INFO] [stderr]   Downloaded libm v0.1.4
[INFO] [stderr]   Downloaded nalgebra v0.18.1
[INFO] [stderr]   Downloaded libc v0.2.62
[INFO] [stderr]   Downloaded alga v0.9.1
[INFO] [stderr]   Downloaded matrixmultiply v0.2.3
[INFO] [stderr]   Downloaded num-complex v0.2.3
[INFO] [stderr]   Downloaded num-traits v0.2.8
[INFO] [stderr]   Downloaded itertools v0.8.0
[INFO] [stderr]   Downloaded bitflags v1.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 16cfa2b0c8720a9de430d2b3ce989f5e210474d9c5362a301784177621005574
[INFO] running `Command { std: "docker" "start" "-a" "16cfa2b0c8720a9de430d2b3ce989f5e210474d9c5362a301784177621005574", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "16cfa2b0c8720a9de430d2b3ce989f5e210474d9c5362a301784177621005574", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "16cfa2b0c8720a9de430d2b3ce989f5e210474d9c5362a301784177621005574", kill_on_drop: false }`
[INFO] [stdout] 16cfa2b0c8720a9de430d2b3ce989f5e210474d9c5362a301784177621005574
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 706c4522ee4ab2a3ee316af4cd855e91305b49e708c5fadb24addc91d0cd12a9
[INFO] running `Command { std: "docker" "start" "-a" "706c4522ee4ab2a3ee316af4cd855e91305b49e708c5fadb24addc91d0cd12a9", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v0.1.6
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling typenum v1.11.2
[INFO] [stderr]    Compiling libm v0.1.4
[INFO] [stderr]    Compiling bitflags v1.2.0
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking rawpointer v0.2.1
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking rand_jitter v0.1.4
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling num-complex v0.2.3
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling num-rational v0.2.2
[INFO] [stderr]     Checking aho-corasick v0.7.6
[INFO] [stderr]     Checking regex-syntax v0.6.12
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking either v1.5.3
[INFO] [stderr]     Checking unicode-width v0.1.6
[INFO] [stderr]     Checking itertools v0.8.0
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking atty v0.2.13
[INFO] [stderr]     Checking matrixmultiply v0.2.3
[INFO] [stderr]     Checking vec_map v0.8.1
[INFO] [stderr]     Checking users v0.9.1
[INFO] [stderr]     Checking generic-array v0.12.3
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking order-stat v0.1.3
[INFO] [stderr]     Checking approx v0.3.2
[INFO] [stderr]     Checking alga v0.9.1
[INFO] [stderr]     Checking nalgebra v0.18.1
[INFO] [stderr]     Checking regex v1.3.1
[INFO] [stderr]     Checking wifiscanner v0.5.1
[INFO] [stderr]     Checking iwls v0.0.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 19.86s
[INFO] running `Command { std: "docker" "inspect" "706c4522ee4ab2a3ee316af4cd855e91305b49e708c5fadb24addc91d0cd12a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "706c4522ee4ab2a3ee316af4cd855e91305b49e708c5fadb24addc91d0cd12a9", kill_on_drop: false }`
[INFO] [stdout] 706c4522ee4ab2a3ee316af4cd855e91305b49e708c5fadb24addc91d0cd12a9
[INFO] checking iwls-0.0.3 against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] extracting crate iwls 0.0.3 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate iwls 0.0.3 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 iwls 0.0.3
[INFO] finished tweaking crates.io crate iwls 0.0.3
[INFO] tweaked toml for crates.io crate iwls 0.0.3 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate crates.io crate iwls 0.0.3 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 78519fbc7b02db97a346492b1f827c74948fac6b657a6b76f22f1a6f66e82f24
[INFO] running `Command { std: "docker" "start" "-a" "78519fbc7b02db97a346492b1f827c74948fac6b657a6b76f22f1a6f66e82f24", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "78519fbc7b02db97a346492b1f827c74948fac6b657a6b76f22f1a6f66e82f24", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "78519fbc7b02db97a346492b1f827c74948fac6b657a6b76f22f1a6f66e82f24", kill_on_drop: false }`
[INFO] [stdout] 78519fbc7b02db97a346492b1f827c74948fac6b657a6b76f22f1a6f66e82f24
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 21e8f47cac972315c123f62fd5f930d0504118c6383cb4728c9686f038968ee6
[INFO] running `Command { std: "docker" "start" "-a" "21e8f47cac972315c123f62fd5f930d0504118c6383cb4728c9686f038968ee6", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v0.1.6
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling typenum v1.11.2
[INFO] [stderr]    Compiling libm v0.1.4
[INFO] [stderr]    Compiling bitflags v1.2.0
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking rawpointer v0.2.1
[INFO] [stderr]     Checking regex-syntax v0.6.12
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling num-complex v0.2.3
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling num-rational v0.2.2
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking rand_jitter v0.1.4
[INFO] [stderr]     Checking aho-corasick v0.7.6
[INFO] [stderr]     Checking either v1.5.3
[INFO] [stderr]     Checking unicode-width v0.1.6
[INFO] [stderr]     Checking itertools v0.8.0
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking atty v0.2.13
[INFO] [stderr]     Checking matrixmultiply v0.2.3
[INFO] [stderr]     Checking vec_map v0.8.1
[INFO] [stderr]     Checking approx v0.3.2
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking generic-array v0.12.3
[INFO] [stderr]     Checking users v0.9.1
[INFO] [stderr]     Checking order-stat v0.1.3
[INFO] [stderr]     Checking regex v1.3.1
[INFO] [stderr]     Checking alga v0.9.1
[INFO] [stderr]     Checking nalgebra v0.18.1
[INFO] [stderr]     Checking wifiscanner v0.5.1
[INFO] [stderr]     Checking iwls v0.0.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 21.40s
[INFO] running `Command { std: "docker" "inspect" "21e8f47cac972315c123f62fd5f930d0504118c6383cb4728c9686f038968ee6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "21e8f47cac972315c123f62fd5f930d0504118c6383cb4728c9686f038968ee6", kill_on_drop: false }`
[INFO] [stdout] 21e8f47cac972315c123f62fd5f930d0504118c6383cb4728c9686f038968ee6