[INFO] fetching crate devpng 0.1.2...
[INFO] testing devpng-0.1.2 against beta-2022-02-22 for beta-1.60-1
[INFO] extracting crate devpng 0.1.2 into /workspace/builds/worker-71/source
[INFO] validating manifest of crates.io crate devpng 0.1.2 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 devpng 0.1.2
[INFO] finished tweaking crates.io crate devpng 0.1.2
[INFO] tweaked toml for crates.io crate devpng 0.1.2 written to /workspace/builds/worker-71/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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded devker v0.1.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-71/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-71/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] be92b752d87df2d549b538da1a9e069751e4b8b28494f9f1d5afd18c49975893
[INFO] running `Command { std: "docker" "start" "-a" "be92b752d87df2d549b538da1a9e069751e4b8b28494f9f1d5afd18c49975893", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "be92b752d87df2d549b538da1a9e069751e4b8b28494f9f1d5afd18c49975893", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be92b752d87df2d549b538da1a9e069751e4b8b28494f9f1d5afd18c49975893", kill_on_drop: false }`
[INFO] [stdout] be92b752d87df2d549b538da1a9e069751e4b8b28494f9f1d5afd18c49975893
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-71/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-71/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] b6f3dc8205b81160534a0a91a4c8449b0913db3146c1d0435660c2468aa833f3
[INFO] running `Command { std: "docker" "start" "-a" "b6f3dc8205b81160534a0a91a4c8449b0913db3146c1d0435660c2468aa833f3", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling devker v0.1.6
[INFO] [stderr]    Compiling devpng v0.1.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.33s
[INFO] running `Command { std: "docker" "inspect" "b6f3dc8205b81160534a0a91a4c8449b0913db3146c1d0435660c2468aa833f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b6f3dc8205b81160534a0a91a4c8449b0913db3146c1d0435660c2468aa833f3", kill_on_drop: false }`
[INFO] [stdout] b6f3dc8205b81160534a0a91a4c8449b0913db3146c1d0435660c2468aa833f3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-71/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-71/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] 42c601c3bd0c265c673bf7893d460bec24e32a3d47f474dc087532501236581b
[INFO] running `Command { std: "docker" "start" "-a" "42c601c3bd0c265c673bf7893d460bec24e32a3d47f474dc087532501236581b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling devpng v0.1.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.39s
[INFO] running `Command { std: "docker" "inspect" "42c601c3bd0c265c673bf7893d460bec24e32a3d47f474dc087532501236581b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "42c601c3bd0c265c673bf7893d460bec24e32a3d47f474dc087532501236581b", kill_on_drop: false }`
[INFO] [stdout] 42c601c3bd0c265c673bf7893d460bec24e32a3d47f474dc087532501236581b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-71/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-71/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] 2f3eba4bd0efe6988c536343cfa875d480773a570dbd4cd7358fafa53b61afa7
[INFO] running `Command { std: "docker" "start" "-a" "2f3eba4bd0efe6988c536343cfa875d480773a570dbd4cd7358fafa53b61afa7", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/devpng-43a970bab30259fa)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests devpng
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test src/lib.rs - (line 57) ... FAILED
[INFO] [stdout] test src/lib.rs - (line 4) ... FAILED
[INFO] [stdout] test src/lib.rs - (line 28) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - (line 57) stdout ----
[INFO] [stdout] error[E0596]: cannot borrow `img` as mutable, as it is not declared as mutable
[INFO] [stdout]   --> src/lib.rs:71:14
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let img = cache.image();
[INFO] [stdout]    |         --- help: consider changing this to be mutable: `mut img`
[INFO] [stdout] ...
[INFO] [stdout] 16 |     for x in img.iter_mut() {
[INFO] [stdout]    |              ^^^^^^^^^^^^^^ cannot borrow as mutable
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0596`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - (line 4) stdout ----
[INFO] [stdout] error[E0596]: cannot borrow `img` as mutable, as it is not declared as mutable
[INFO] [stdout]   --> src/lib.rs:17:14
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let img = png.image();
[INFO] [stdout]    |         --- help: consider changing this to be mutable: `mut img`
[INFO] [stdout] ...
[INFO] [stdout] 15 |     for x in img.iter_mut() {
[INFO] [stdout]    |              ^^^^^^^^^^^^^^ cannot borrow as mutable
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0596`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - (line 28) stdout ----
[INFO] [stdout] Test executable failed (exit code 1).
[INFO] [stdout] 
[INFO] [stdout] stderr:
[INFO] [stdout] Error: "Read-only file system (os error 30)"
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - (line 28)
[INFO] [stdout]     src/lib.rs - (line 4)
[INFO] [stdout]     src/lib.rs - (line 57)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 3 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.44s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] running `Command { std: "docker" "inspect" "2f3eba4bd0efe6988c536343cfa875d480773a570dbd4cd7358fafa53b61afa7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f3eba4bd0efe6988c536343cfa875d480773a570dbd4cd7358fafa53b61afa7", kill_on_drop: false }`
[INFO] [stdout] 2f3eba4bd0efe6988c536343cfa875d480773a570dbd4cd7358fafa53b61afa7