[INFO] fetching crate svpng 0.1.1...
[INFO] testing svpng-0.1.1 against beta-2022-02-22 for beta-1.60-1
[INFO] extracting crate svpng 0.1.1 into /workspace/builds/worker-52/source
[INFO] validating manifest of crates.io crate svpng 0.1.1 on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate svpng 0.1.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate svpng 0.1.1
[INFO] tweaked toml for crates.io crate svpng 0.1.1 written to /workspace/builds/worker-52/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "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-52/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-52/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a61b2bf7d8e617a8ae812f38b6b91a2826e25d7fbb564f6818ccf3371c5fa581
[INFO] running `Command { std: "docker" "start" "-a" "a61b2bf7d8e617a8ae812f38b6b91a2826e25d7fbb564f6818ccf3371c5fa581", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a61b2bf7d8e617a8ae812f38b6b91a2826e25d7fbb564f6818ccf3371c5fa581", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a61b2bf7d8e617a8ae812f38b6b91a2826e25d7fbb564f6818ccf3371c5fa581", kill_on_drop: false }`
[INFO] [stdout] a61b2bf7d8e617a8ae812f38b6b91a2826e25d7fbb564f6818ccf3371c5fa581
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-52/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-52/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 479c2e0c04d6cd34d8075167068c0ad5e85220a8a395440e06fc9c9a097d624d
[INFO] running `Command { std: "docker" "start" "-a" "479c2e0c04d6cd34d8075167068c0ad5e85220a8a395440e06fc9c9a097d624d", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling svpng v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.35s
[INFO] running `Command { std: "docker" "inspect" "479c2e0c04d6cd34d8075167068c0ad5e85220a8a395440e06fc9c9a097d624d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "479c2e0c04d6cd34d8075167068c0ad5e85220a8a395440e06fc9c9a097d624d", kill_on_drop: false }`
[INFO] [stdout] 479c2e0c04d6cd34d8075167068c0ad5e85220a8a395440e06fc9c9a097d624d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-52/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-52/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 89c76b3892002dbcf2494f57bb69a0902fe3d70c35bdce9eee3c118a29cc54cc
[INFO] running `Command { std: "docker" "start" "-a" "89c76b3892002dbcf2494f57bb69a0902fe3d70c35bdce9eee3c118a29cc54cc", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling svpng v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.94s
[INFO] running `Command { std: "docker" "inspect" "89c76b3892002dbcf2494f57bb69a0902fe3d70c35bdce9eee3c118a29cc54cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "89c76b3892002dbcf2494f57bb69a0902fe3d70c35bdce9eee3c118a29cc54cc", kill_on_drop: false }`
[INFO] [stdout] 89c76b3892002dbcf2494f57bb69a0902fe3d70c35bdce9eee3c118a29cc54cc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-52/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-52/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 9c5f7689be9f156a7825041e63307366d17943dda1a58f4939cde304fca94514
[INFO] running `Command { std: "docker" "start" "-a" "9c5f7689be9f156a7825041e63307366d17943dda1a58f4939cde304fca94514", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/svpng-88dad894373f73b8)
[INFO] [stdout] running 1 test
[INFO] [stderr]    Doc-tests svpng
[INFO] [stdout] test tests::crc32_test ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs - svpng (line 11) - compile ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - svpng (line 11) stdout ----
[INFO] [stdout] error[E0423]: expected function, found crate `svpng`
[INFO] [stdout]   --> src/lib.rs:21:1
[INFO] [stdout]    |
[INFO] [stdout] 13 | svpng("rgb.png", 256, 256, &pix, false)?;
[INFO] [stdout]    | ^^^^^ not a function
[INFO] [stdout]    |
[INFO] [stdout] help: consider importing this function instead
[INFO] [stdout]    |
[INFO] [stdout] 4  | use svpng::svpng;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:21:40
[INFO] [stdout]    |
[INFO] [stdout] 4  |   fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_11_0() {
[INFO] [stdout]    |  ______________________________________-
[INFO] [stdout] 5  | | let mut pix = Vec::new();
[INFO] [stdout] 6  | | for y in 0..=255 {
[INFO] [stdout] 7  | |     for x in 0..=255 {
[INFO] [stdout] ...  |
[INFO] [stdout] 13 | | svpng("rgb.png", 256, 256, &pix, false)?;
[INFO] [stdout]    | |                                        ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout] 14 | | } _doctest_main_src_lib_rs_11_0() }
[INFO] [stdout]    | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FromResidual<_>` is not implemented for `()`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0423.
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - svpng (line 11)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.68s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] running `Command { std: "docker" "inspect" "9c5f7689be9f156a7825041e63307366d17943dda1a58f4939cde304fca94514", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9c5f7689be9f156a7825041e63307366d17943dda1a58f4939cde304fca94514", kill_on_drop: false }`
[INFO] [stdout] 9c5f7689be9f156a7825041e63307366d17943dda1a58f4939cde304fca94514