[INFO] fetching crate immo 0.1.2...
[INFO] checking immo-0.1.2 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate immo 0.1.2 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate immo 0.1.2 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 immo 0.1.2
[INFO] finished tweaking crates.io crate immo 0.1.2
[INFO] tweaked toml for crates.io crate immo 0.1.2 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate crates.io crate immo 0.1.2 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 flate2 v1.0.25
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] c6c65a71bacf35a15ff20fc2203f37def7dacb4d7fbdf0ec14416306593b4b34
[INFO] running `Command { std: "docker" "start" "-a" "c6c65a71bacf35a15ff20fc2203f37def7dacb4d7fbdf0ec14416306593b4b34", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c6c65a71bacf35a15ff20fc2203f37def7dacb4d7fbdf0ec14416306593b4b34", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6c65a71bacf35a15ff20fc2203f37def7dacb4d7fbdf0ec14416306593b4b34", kill_on_drop: false }`
[INFO] [stdout] c6c65a71bacf35a15ff20fc2203f37def7dacb4d7fbdf0ec14416306593b4b34
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 0df9eae44d6b603dfddf3e66fc7d07914c2ee10a60f7d4ec544c2696969f7696
[INFO] running `Command { std: "docker" "start" "-a" "0df9eae44d6b603dfddf3e66fc7d07914c2ee10a60f7d4ec544c2696969f7696", kill_on_drop: false }`
[INFO] [stderr]    Compiling crc32fast v1.3.2
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]     Checking miniz_oxide v0.6.2
[INFO] [stderr]     Checking immo v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/error.rs:40:19
[INFO] [stdout]    |
[INFO] [stdout] 39 | impl ImageError {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 40 |     pub(crate) fn new<E>(kind: ErrorKind, error: E) -> Self
[INFO] [stdout]    |                   ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Custom` is never constructed
[INFO] [stdout]   --> src/error.rs:65:5
[INFO] [stdout]    |
[INFO] [stdout] 63 | enum _ImageError {
[INFO] [stdout]    |      ----------- variant in this enum
[INFO] [stdout] 64 |     Simple(ErrorKind),
[INFO] [stdout] 65 |     Custom((ErrorKind, Box<dyn error::Error + Send + Sync>)),
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking flate2 v1.0.25
[INFO] [stderr]     Checking png v0.17.7
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `LIGHT_AQUA` is never used
[INFO] [stdout]   --> examples/line.rs:10:7
[INFO] [stdout]    |
[INFO] [stdout] 10 | const LIGHT_AQUA: (u8, u8, u8, u8) = (170, 222, 240, 255);
[INFO] [stdout]    |       ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `DARK_AQUA` is never used
[INFO] [stdout]   --> examples/line.rs:11:7
[INFO] [stdout]    |
[INFO] [stdout] 11 | const DARK_AQUA: (u8, u8, u8, u8) = (0, 140, 180, 255);
[INFO] [stdout]    |       ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `AQUA` is never used
[INFO] [stdout]   --> examples/line.rs:12:7
[INFO] [stdout]    |
[INFO] [stdout] 12 | const AQUA: (u8, u8, u8, u8) = (0, 222, 255, 255);
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/error.rs:40:19
[INFO] [stdout]    |
[INFO] [stdout] 39 | impl ImageError {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 40 |     pub(crate) fn new<E>(kind: ErrorKind, error: E) -> Self
[INFO] [stdout]    |                   ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Custom` is never constructed
[INFO] [stdout]   --> src/error.rs:65:5
[INFO] [stdout]    |
[INFO] [stdout] 63 | enum _ImageError {
[INFO] [stdout]    |      ----------- variant in this enum
[INFO] [stdout] 64 |     Simple(ErrorKind),
[INFO] [stdout] 65 |     Custom((ErrorKind, Box<dyn error::Error + Send + Sync>)),
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.91s
[INFO] running `Command { std: "docker" "inspect" "0df9eae44d6b603dfddf3e66fc7d07914c2ee10a60f7d4ec544c2696969f7696", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0df9eae44d6b603dfddf3e66fc7d07914c2ee10a60f7d4ec544c2696969f7696", kill_on_drop: false }`
[INFO] [stdout] 0df9eae44d6b603dfddf3e66fc7d07914c2ee10a60f7d4ec544c2696969f7696
[INFO] checking immo-0.1.2 against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] extracting crate immo 0.1.2 into /workspace/builds/worker-6-tc2/source
[INFO] validating manifest of crates.io crate immo 0.1.2 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 immo 0.1.2
[INFO] finished tweaking crates.io crate immo 0.1.2
[INFO] tweaked toml for crates.io crate immo 0.1.2 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate crates.io crate immo 0.1.2 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-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 8f6c9916bd50d476e3bcec344853740c01deded0ca74ed3eeef78d7b40be6efd
[INFO] running `Command { std: "docker" "start" "-a" "8f6c9916bd50d476e3bcec344853740c01deded0ca74ed3eeef78d7b40be6efd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8f6c9916bd50d476e3bcec344853740c01deded0ca74ed3eeef78d7b40be6efd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f6c9916bd50d476e3bcec344853740c01deded0ca74ed3eeef78d7b40be6efd", kill_on_drop: false }`
[INFO] [stdout] 8f6c9916bd50d476e3bcec344853740c01deded0ca74ed3eeef78d7b40be6efd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 567c05fedcf6091ce1fce7d71319b409fec51659be20a1aa154a005c0842c36a
[INFO] running `Command { std: "docker" "start" "-a" "567c05fedcf6091ce1fce7d71319b409fec51659be20a1aa154a005c0842c36a", kill_on_drop: false }`
[INFO] [stderr]    Compiling crc32fast v1.3.2
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]     Checking miniz_oxide v0.6.2
[INFO] [stderr]     Checking immo v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking flate2 v1.0.25
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/error.rs:40:19
[INFO] [stdout]    |
[INFO] [stdout] 39 | impl ImageError {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 40 |     pub(crate) fn new<E>(kind: ErrorKind, error: E) -> Self
[INFO] [stdout]    |                   ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Custom` is never constructed
[INFO] [stdout]   --> src/error.rs:65:5
[INFO] [stdout]    |
[INFO] [stdout] 63 | enum _ImageError {
[INFO] [stdout]    |      ----------- variant in this enum
[INFO] [stdout] 64 |     Simple(ErrorKind),
[INFO] [stdout] 65 |     Custom((ErrorKind, Box<dyn error::Error + Send + Sync>)),
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking png v0.17.7
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `LIGHT_AQUA` is never used
[INFO] [stdout]   --> examples/line.rs:10:7
[INFO] [stdout]    |
[INFO] [stdout] 10 | const LIGHT_AQUA: (u8, u8, u8, u8) = (170, 222, 240, 255);
[INFO] [stdout]    |       ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `DARK_AQUA` is never used
[INFO] [stdout]   --> examples/line.rs:11:7
[INFO] [stdout]    |
[INFO] [stdout] 11 | const DARK_AQUA: (u8, u8, u8, u8) = (0, 140, 180, 255);
[INFO] [stdout]    |       ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `AQUA` is never used
[INFO] [stdout]   --> examples/line.rs:12:7
[INFO] [stdout]    |
[INFO] [stdout] 12 | const AQUA: (u8, u8, u8, u8) = (0, 222, 255, 255);
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/error.rs:40:19
[INFO] [stdout]    |
[INFO] [stdout] 39 | impl ImageError {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 40 |     pub(crate) fn new<E>(kind: ErrorKind, error: E) -> Self
[INFO] [stdout]    |                   ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Custom` is never constructed
[INFO] [stdout]   --> src/error.rs:65:5
[INFO] [stdout]    |
[INFO] [stdout] 63 | enum _ImageError {
[INFO] [stdout]    |      ----------- variant in this enum
[INFO] [stdout] 64 |     Simple(ErrorKind),
[INFO] [stdout] 65 |     Custom((ErrorKind, Box<dyn error::Error + Send + Sync>)),
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.96s
[INFO] running `Command { std: "docker" "inspect" "567c05fedcf6091ce1fce7d71319b409fec51659be20a1aa154a005c0842c36a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "567c05fedcf6091ce1fce7d71319b409fec51659be20a1aa154a005c0842c36a", kill_on_drop: false }`
[INFO] [stdout] 567c05fedcf6091ce1fce7d71319b409fec51659be20a1aa154a005c0842c36a