[INFO] fetching crate harriet 0.3.1...
[INFO] checking harriet-0.3.1 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate harriet 0.3.1 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate harriet 0.3.1 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] removed /workspace/builds/worker-0-tc1/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate harriet 0.3.1
[INFO] finished tweaking crates.io crate harriet 0.3.1
[INFO] tweaked toml for crates.io crate harriet 0.3.1 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate crates.io crate harriet 0.3.1 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 nom v7.1.1
[INFO] [stderr]   Downloaded ctor v0.1.22
[INFO] [stderr]   Downloaded output_vt100 v0.1.3
[INFO] [stderr]   Downloaded cookie-factory v0.3.2
[INFO] [stderr]   Downloaded anyhow v1.0.58
[INFO] [stderr]   Downloaded syn v1.0.92
[INFO] [stderr]   Downloaded pretty_assertions v1.2.1
[INFO] [stderr]   Downloaded oxiri v0.2.2
[INFO] [stderr]   Downloaded snowflake v1.3.0
[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] 3a03f78eecb9492d998f93838db832ac4388a2f21747498d07c67390584b0093
[INFO] running `Command { std: "docker" "start" "-a" "3a03f78eecb9492d998f93838db832ac4388a2f21747498d07c67390584b0093", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3a03f78eecb9492d998f93838db832ac4388a2f21747498d07c67390584b0093", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3a03f78eecb9492d998f93838db832ac4388a2f21747498d07c67390584b0093", kill_on_drop: false }`
[INFO] [stdout] 3a03f78eecb9492d998f93838db832ac4388a2f21747498d07c67390584b0093
[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] c47d9248e5402fff91a7b6143c3812f8c4cb08257c292874d33971685337fdf8
[INFO] running `Command { std: "docker" "start" "-a" "c47d9248e5402fff91a7b6143c3812f8c4cb08257c292874d33971685337fdf8", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling anyhow v1.0.58
[INFO] [stderr]     Checking minimal-lexical v0.2.1
[INFO] [stderr]     Checking diff v0.1.12
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking oxiri v0.2.2
[INFO] [stderr]     Checking cookie-factory v0.3.2
[INFO] [stderr]     Checking snowflake v1.3.0
[INFO] [stderr]     Checking pretty_assertions v1.2.1
[INFO] [stderr]     Checking nom v7.1.1
[INFO] [stderr]     Checking harriet v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `VerboseError` is imported redundantly
[INFO] [stdout]     --> src/lib.rs:1697:9
[INFO] [stdout]      |
[INFO] [stdout] 1696 |     use super::*;
[INFO] [stdout]      |         -------- the item `VerboseError` is already imported here
[INFO] [stdout] 1697 |     use nom::error::VerboseError;
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `nom::error::VerboseError`
[INFO] [stdout]  --> tests/triple_production_examples.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use nom::error::VerboseError;
[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] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> examples/parse.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     dbg!(result);
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> examples/triples.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     dbg!(TripleProducer::produce_for_document(&document));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.11s
[INFO] running `Command { std: "docker" "inspect" "c47d9248e5402fff91a7b6143c3812f8c4cb08257c292874d33971685337fdf8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c47d9248e5402fff91a7b6143c3812f8c4cb08257c292874d33971685337fdf8", kill_on_drop: false }`
[INFO] [stdout] c47d9248e5402fff91a7b6143c3812f8c4cb08257c292874d33971685337fdf8
[INFO] checking harriet-0.3.1 against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] extracting crate harriet 0.3.1 into /workspace/builds/worker-0-tc2/source
[INFO] validating manifest of crates.io crate harriet 0.3.1 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] removed /workspace/builds/worker-0-tc2/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate harriet 0.3.1
[INFO] finished tweaking crates.io crate harriet 0.3.1
[INFO] tweaked toml for crates.io crate harriet 0.3.1 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate crates.io crate harriet 0.3.1 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] [stderr]     Blocking waiting for file lock on package cache
[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] ad4b5c9c1d2a9019488ce34693021241c5b73747a662a769c741b5b9339adb32
[INFO] running `Command { std: "docker" "start" "-a" "ad4b5c9c1d2a9019488ce34693021241c5b73747a662a769c741b5b9339adb32", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ad4b5c9c1d2a9019488ce34693021241c5b73747a662a769c741b5b9339adb32", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ad4b5c9c1d2a9019488ce34693021241c5b73747a662a769c741b5b9339adb32", kill_on_drop: false }`
[INFO] [stdout] ad4b5c9c1d2a9019488ce34693021241c5b73747a662a769c741b5b9339adb32
[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] b3bf37387aa822e4b35606ccaa6e52d43498a69a665e6893dd339269afa79fea
[INFO] running `Command { std: "docker" "start" "-a" "b3bf37387aa822e4b35606ccaa6e52d43498a69a665e6893dd339269afa79fea", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling anyhow v1.0.58
[INFO] [stderr]     Checking minimal-lexical v0.2.1
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking snowflake v1.3.0
[INFO] [stderr]     Checking diff v0.1.12
[INFO] [stderr]     Checking cookie-factory v0.3.2
[INFO] [stderr]     Checking oxiri v0.2.2
[INFO] [stderr]     Checking pretty_assertions v1.2.1
[INFO] [stderr]     Checking nom v7.1.1
[INFO] [stderr]     Checking harriet v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `VerboseError` is imported redundantly
[INFO] [stdout]     --> src/lib.rs:1697:9
[INFO] [stdout]      |
[INFO] [stdout] 1696 |     use super::*;
[INFO] [stdout]      |         -------- the item `VerboseError` is already imported here
[INFO] [stdout] 1697 |     use nom::error::VerboseError;
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> examples/parse.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     dbg!(result);
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `nom::error::VerboseError`
[INFO] [stdout]  --> tests/triple_production_examples.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use nom::error::VerboseError;
[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] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> examples/triples.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     dbg!(TripleProducer::produce_for_document(&document));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.60s
[INFO] running `Command { std: "docker" "inspect" "b3bf37387aa822e4b35606ccaa6e52d43498a69a665e6893dd339269afa79fea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b3bf37387aa822e4b35606ccaa6e52d43498a69a665e6893dd339269afa79fea", kill_on_drop: false }`
[INFO] [stdout] b3bf37387aa822e4b35606ccaa6e52d43498a69a665e6893dd339269afa79fea