[INFO] fetching crate heterob 0.3.0...
[INFO] checking heterob-0.3.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate heterob 0.3.0 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate heterob 0.3.0 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 heterob 0.3.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate heterob 0.3.0
[INFO] tweaked toml for crates.io crate heterob 0.3.0 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate crates.io crate heterob 0.3.0 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]  Downloading crates ...
[INFO] [stderr]   Downloaded paste v1.0.7
[INFO] [stderr]   Downloaded plotters v0.3.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] d7cbd3e46b34940a17ed771e703e5130ec1c9282ff242840fe1ea4ab4e7f50a9
[INFO] running `Command { std: "docker" "start" "-a" "d7cbd3e46b34940a17ed771e703e5130ec1c9282ff242840fe1ea4ab4e7f50a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d7cbd3e46b34940a17ed771e703e5130ec1c9282ff242840fe1ea4ab4e7f50a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d7cbd3e46b34940a17ed771e703e5130ec1c9282ff242840fe1ea4ab4e7f50a9", kill_on_drop: false }`
[INFO] [stdout] d7cbd3e46b34940a17ed771e703e5130ec1c9282ff242840fe1ea4ab4e7f50a9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 543bbf8decdc407fc2eba50465bc8c8de6d01fc716ca68261eb25d39aa0f2d6b
[INFO] running `Command { std: "docker" "start" "-a" "543bbf8decdc407fc2eba50465bc8c8de6d01fc716ca68261eb25d39aa0f2d6b", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.144
[INFO] [stderr]    Compiling crossbeam-utils v0.8.11
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]     Checking once_cell v1.13.1
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.10
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling rayon-core v1.9.3
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling syn v1.0.99
[INFO] [stderr]    Compiling serde_json v1.0.85
[INFO] [stderr]    Compiling rayon v1.5.3
[INFO] [stderr]    Compiling serde_derive v1.0.144
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking plotters-backend v0.3.4
[INFO] [stderr]     Checking cast v0.3.0
[INFO] [stderr]     Checking itoa v0.4.8
[INFO] [stderr]     Checking regex-syntax v0.6.27
[INFO] [stderr]     Checking half v1.8.2
[INFO] [stderr]     Checking criterion-plot v0.4.5
[INFO] [stderr]     Checking walkdir v2.3.2
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking plotters-svg v0.3.3
[INFO] [stderr]    Compiling paste v1.0.7
[INFO] [stderr]     Checking oorandom v11.1.3
[INFO] [stderr]     Checking crossbeam-channel v0.5.6
[INFO] [stderr]     Checking crossbeam-deque v0.8.2
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking heterob v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking regex v1.6.0
[INFO] [stderr]     Checking plotters v0.3.3
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stderr]     Checking csv v1.1.6
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking criterion v0.3.6
[INFO] [stdout] warning: unused import: `heterob::U16`
[INFO] [stdout]  --> examples/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use heterob::U16;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 23.67s
[INFO] running `Command { std: "docker" "inspect" "543bbf8decdc407fc2eba50465bc8c8de6d01fc716ca68261eb25d39aa0f2d6b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "543bbf8decdc407fc2eba50465bc8c8de6d01fc716ca68261eb25d39aa0f2d6b", kill_on_drop: false }`
[INFO] [stdout] 543bbf8decdc407fc2eba50465bc8c8de6d01fc716ca68261eb25d39aa0f2d6b
[INFO] checking heterob-0.3.0 against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] extracting crate heterob 0.3.0 into /workspace/builds/worker-1-tc2/source
[INFO] validating manifest of crates.io crate heterob 0.3.0 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 heterob 0.3.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate heterob 0.3.0
[INFO] tweaked toml for crates.io crate heterob 0.3.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate crates.io crate heterob 0.3.0 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 3134892014cfaf11c447c61750fd040e1ca77f41222fef579b6d8d09751d15a8
[INFO] running `Command { std: "docker" "start" "-a" "3134892014cfaf11c447c61750fd040e1ca77f41222fef579b6d8d09751d15a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3134892014cfaf11c447c61750fd040e1ca77f41222fef579b6d8d09751d15a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3134892014cfaf11c447c61750fd040e1ca77f41222fef579b6d8d09751d15a8", kill_on_drop: false }`
[INFO] [stdout] 3134892014cfaf11c447c61750fd040e1ca77f41222fef579b6d8d09751d15a8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 9d41af4c6b8def560cb3104ef03c091e32b778629648766abc03d705d2e1efa0
[INFO] running `Command { std: "docker" "start" "-a" "9d41af4c6b8def560cb3104ef03c091e32b778629648766abc03d705d2e1efa0", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.144
[INFO] [stderr]    Compiling crossbeam-utils v0.8.11
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]     Checking once_cell v1.13.1
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.10
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling rayon-core v1.9.3
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling syn v1.0.99
[INFO] [stderr]    Compiling serde_json v1.0.85
[INFO] [stderr]    Compiling rayon v1.5.3
[INFO] [stderr]    Compiling serde_derive v1.0.144
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking plotters-backend v0.3.4
[INFO] [stderr]     Checking cast v0.3.0
[INFO] [stderr]     Checking itoa v0.4.8
[INFO] [stderr]     Checking regex-syntax v0.6.27
[INFO] [stderr]     Checking half v1.8.2
[INFO] [stderr]     Checking walkdir v2.3.2
[INFO] [stderr]     Checking criterion-plot v0.4.5
[INFO] [stderr]     Checking plotters-svg v0.3.3
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]    Compiling paste v1.0.7
[INFO] [stderr]     Checking oorandom v11.1.3
[INFO] [stderr]     Checking crossbeam-channel v0.5.6
[INFO] [stderr]     Checking heterob v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking crossbeam-deque v0.8.2
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking regex v1.6.0
[INFO] [stderr]     Checking plotters v0.3.3
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stderr]     Checking csv v1.1.6
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking criterion v0.3.6
[INFO] [stdout] warning: unused import: `heterob::U16`
[INFO] [stdout]  --> examples/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use heterob::U16;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 11.20s
[INFO] running `Command { std: "docker" "inspect" "9d41af4c6b8def560cb3104ef03c091e32b778629648766abc03d705d2e1efa0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9d41af4c6b8def560cb3104ef03c091e32b778629648766abc03d705d2e1efa0", kill_on_drop: false }`
[INFO] [stdout] 9d41af4c6b8def560cb3104ef03c091e32b778629648766abc03d705d2e1efa0