[INFO] cloning repository https://github.com/dhairy-online/quizzrs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dhairy-online/quizzrs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdhairy-online%2Fquizzrs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdhairy-online%2Fquizzrs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 70d4e1dd7e20ab2c15d55f19ada4ef90b26242fd
[INFO] checking dhairy-online/quizzrs against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdhairy-online%2Fquizzrs" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dhairy-online/quizzrs 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/dhairy-online/quizzrs
[INFO] finished tweaking git repo https://github.com/dhairy-online/quizzrs
[INFO] tweaked toml for git repo https://github.com/dhairy-online/quizzrs written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/dhairy-online/quizzrs 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded clang-sys v1.3.0
[INFO] [stderr]   Downloaded tts_rust v0.3.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 05f342a9a01bd3f6365c0ab068b2cef2053e1b4ab6d18a3428f58b36e8c786b8
[INFO] running `Command { std: "docker" "start" "-a" "05f342a9a01bd3f6365c0ab068b2cef2053e1b4ab6d18a3428f58b36e8c786b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "05f342a9a01bd3f6365c0ab068b2cef2053e1b4ab6d18a3428f58b36e8c786b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "05f342a9a01bd3f6365c0ab068b2cef2053e1b4ab6d18a3428f58b36e8c786b8", kill_on_drop: false }`
[INFO] [stdout] 05f342a9a01bd3f6365c0ab068b2cef2053e1b4ab6d18a3428f58b36e8c786b8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 1a65a855ad86951b681784a836d7905cae0c33d9e316d8b4ceabcd4ee9703ca1
[INFO] running `Command { std: "docker" "start" "-a" "1a65a855ad86951b681784a836d7905cae0c33d9e316d8b4ceabcd4ee9703ca1", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.109
[INFO] [stderr]    Compiling cc v1.0.72
[INFO] [stderr]    Compiling proc-macro2 v1.0.33
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]    Compiling pkg-config v0.3.23
[INFO] [stderr]     Checking once_cell v1.8.0
[INFO] [stderr]    Compiling parking_lot_core v0.8.5
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking smallvec v1.7.0
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]     Checking instant v0.1.12
[INFO] [stderr]     Checking lock_api v0.4.5
[INFO] [stderr]     Checking tinyvec_macros v0.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]    Compiling cpal v0.13.4
[INFO] [stderr]     Checking ogg v0.8.0
[INFO] [stderr]    Compiling minreq v2.4.2
[INFO] [stderr]     Checking tinyvec v1.5.1
[INFO] [stderr]     Checking base64 v0.13.0
[INFO] [stderr]    Compiling ryu v1.0.6
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling serde_json v1.0.72
[INFO] [stderr]     Checking claxon v0.4.3
[INFO] [stderr]     Checking hound v3.4.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.15
[INFO] [stderr]     Checking itoa v0.4.8
[INFO] [stderr]     Checking percent-encoding v2.1.0
[INFO] [stderr]    Compiling alsa-sys v0.3.1
[INFO] [stderr]    Compiling ring v0.16.20
[INFO] [stderr]    Compiling minimp3-sys v0.3.2
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking lewton v0.10.2
[INFO] [stderr]     Checking nix v0.20.2
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking slice-deque v0.3.0
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking parking_lot v0.11.2
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]     Checking webpki v0.21.4
[INFO] [stderr]     Checking sct v0.6.1
[INFO] [stderr]     Checking rustls v0.19.1
[INFO] [stderr]     Checking webpki-roots v0.18.0
[INFO] [stderr]     Checking thiserror v1.0.30
[INFO] [stderr]     Checking minimp3 v0.5.1
[INFO] [stderr]     Checking alsa v0.5.0
[INFO] [stderr]     Checking rodio v0.14.0
[INFO] [stderr]     Checking tts_rust v0.3.3
[INFO] [stderr]     Checking quizzr v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `incorrect` is never read
[INFO] [stdout]   --> src/quiz.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct QuizResult {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] 28 |     pub correct: bool,
[INFO] [stdout] 29 |     pub incorrect: bool,
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `QuizResult` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `incorrect` is never read
[INFO] [stdout]   --> src/quiz.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct QuizResult {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] 28 |     pub correct: bool,
[INFO] [stdout] 29 |     pub incorrect: bool,
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `QuizResult` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[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 18.05s
[INFO] running `Command { std: "docker" "inspect" "1a65a855ad86951b681784a836d7905cae0c33d9e316d8b4ceabcd4ee9703ca1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1a65a855ad86951b681784a836d7905cae0c33d9e316d8b4ceabcd4ee9703ca1", kill_on_drop: false }`
[INFO] [stdout] 1a65a855ad86951b681784a836d7905cae0c33d9e316d8b4ceabcd4ee9703ca1
[INFO] checking dhairy-online/quizzrs against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdhairy-online%2Fquizzrs" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dhairy-online/quizzrs 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/dhairy-online/quizzrs
[INFO] finished tweaking git repo https://github.com/dhairy-online/quizzrs
[INFO] tweaked toml for git repo https://github.com/dhairy-online/quizzrs written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/dhairy-online/quizzrs 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-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] ce25185be1f9c5f6e5a77aa92c2b66d0a7673da6a52e3bef8280a8c93607f2d2
[INFO] running `Command { std: "docker" "start" "-a" "ce25185be1f9c5f6e5a77aa92c2b66d0a7673da6a52e3bef8280a8c93607f2d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ce25185be1f9c5f6e5a77aa92c2b66d0a7673da6a52e3bef8280a8c93607f2d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce25185be1f9c5f6e5a77aa92c2b66d0a7673da6a52e3bef8280a8c93607f2d2", kill_on_drop: false }`
[INFO] [stdout] ce25185be1f9c5f6e5a77aa92c2b66d0a7673da6a52e3bef8280a8c93607f2d2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 9769293a95e087fcbd338d752b3028c7aaee78b3caa192564675b9c609e0a874
[INFO] running `Command { std: "docker" "start" "-a" "9769293a95e087fcbd338d752b3028c7aaee78b3caa192564675b9c609e0a874", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.109
[INFO] [stderr]    Compiling cc v1.0.72
[INFO] [stderr]    Compiling proc-macro2 v1.0.33
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]     Checking once_cell v1.8.0
[INFO] [stderr]    Compiling pkg-config v0.3.23
[INFO] [stderr]    Compiling parking_lot_core v0.8.5
[INFO] [stderr]     Checking smallvec v1.7.0
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]     Checking instant v0.1.12
[INFO] [stderr]     Checking lock_api v0.4.5
[INFO] [stderr]     Checking tinyvec_macros v0.1.0
[INFO] [stderr]    Compiling cpal v0.13.4
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]     Checking tinyvec v1.5.1
[INFO] [stderr]     Checking ogg v0.8.0
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling ryu v1.0.6
[INFO] [stderr]     Checking base64 v0.13.0
[INFO] [stderr]    Compiling minreq v2.4.2
[INFO] [stderr]    Compiling serde_json v1.0.72
[INFO] [stderr]     Checking ppv-lite86 v0.2.15
[INFO] [stderr]     Checking hound v3.4.0
[INFO] [stderr]     Checking claxon v0.4.3
[INFO] [stderr]     Checking itoa v0.4.8
[INFO] [stderr]     Checking percent-encoding v2.1.0
[INFO] [stderr]    Compiling alsa-sys v0.3.1
[INFO] [stderr]    Compiling ring v0.16.20
[INFO] [stderr]    Compiling minimp3-sys v0.3.2
[INFO] [stderr]     Checking lewton v0.10.2
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking nix v0.20.2
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking slice-deque v0.3.0
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking parking_lot v0.11.2
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]     Checking webpki v0.21.4
[INFO] [stderr]     Checking sct v0.6.1
[INFO] [stderr]     Checking alsa v0.5.0
[INFO] [stderr]     Checking thiserror v1.0.30
[INFO] [stderr]     Checking webpki-roots v0.18.0
[INFO] [stderr]     Checking rustls v0.19.1
[INFO] [stderr]     Checking minimp3 v0.5.1
[INFO] [stderr]     Checking rodio v0.14.0
[INFO] [stderr]     Checking tts_rust v0.3.3
[INFO] [stderr]     Checking quizzr v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `incorrect` is never read
[INFO] [stdout]   --> src/quiz.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct QuizResult {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] 28 |     pub correct: bool,
[INFO] [stdout] 29 |     pub incorrect: bool,
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `QuizResult` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `incorrect` is never read
[INFO] [stdout]   --> src/quiz.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct QuizResult {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] 28 |     pub correct: bool,
[INFO] [stdout] 29 |     pub incorrect: bool,
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `QuizResult` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[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 17.91s
[INFO] running `Command { std: "docker" "inspect" "9769293a95e087fcbd338d752b3028c7aaee78b3caa192564675b9c609e0a874", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9769293a95e087fcbd338d752b3028c7aaee78b3caa192564675b9c609e0a874", kill_on_drop: false }`
[INFO] [stdout] 9769293a95e087fcbd338d752b3028c7aaee78b3caa192564675b9c609e0a874