[INFO] fetching crate gufo-tiff 0.3.0...
[INFO] checking gufo-tiff-0.3.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate gufo-tiff 0.3.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate gufo-tiff 0.3.0
[INFO] finished tweaking crates.io crate gufo-tiff 0.3.0
[INFO] tweaked toml for crates.io crate gufo-tiff 0.3.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate gufo-tiff 0.3.0 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate gufo-tiff 0.3.0 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2e3ddf3ca5634a1d1fd96c6bfbf858ae5ef2c99b7cdf6e12af3dc9555df70ec5
[INFO] running `Command { std: "docker" "start" "-a" "2e3ddf3ca5634a1d1fd96c6bfbf858ae5ef2c99b7cdf6e12af3dc9555df70ec5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2e3ddf3ca5634a1d1fd96c6bfbf858ae5ef2c99b7cdf6e12af3dc9555df70ec5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2e3ddf3ca5634a1d1fd96c6bfbf858ae5ef2c99b7cdf6e12af3dc9555df70ec5", kill_on_drop: false }`
[INFO] [stdout] 2e3ddf3ca5634a1d1fd96c6bfbf858ae5ef2c99b7cdf6e12af3dc9555df70ec5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8a74cc3d50468e6b2bf6199b04d35b7b50c9d3f9dc9fd44c3c1387225e504e1e
[INFO] running `Command { std: "docker" "start" "-a" "8a74cc3d50468e6b2bf6199b04d35b7b50c9d3f9dc9fd44c3c1387225e504e1e", kill_on_drop: false }`
[INFO] [stderr]    Compiling thiserror-impl v2.0.12
[INFO] [stderr]     Checking thiserror v2.0.12
[INFO] [stderr]     Checking gufo-common v1.0.0
[INFO] [stderr]     Checking gufo-tiff v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<&[u8], Error>
[INFO] [stdout]   --> src/lib.rs:24:48
[INFO] [stdout]    |
[INFO] [stdout] 24 |       pub fn exif(&self) -> Result<&[u8], Error> {
[INFO] [stdout]    |  ________________________________________________^
[INFO] [stdout] 25 | |         Ok(&self.data)
[INFO] [stdout] 26 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&[u8], Error>
[INFO] [stdout]   --> src/lib.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |         Ok(&self.data)
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&[u8], Error>
[INFO] [stdout]   --> src/lib.rs:24:48
[INFO] [stdout]    |
[INFO] [stdout] 24 |       pub fn exif(&self) -> Result<&[u8], Error> {
[INFO] [stdout]    |  ________________________________________________^
[INFO] [stdout] 25 | |         Ok(&self.data)
[INFO] [stdout] 26 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&[u8], Error>
[INFO] [stdout]   --> src/lib.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |         Ok(&self.data)
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `gufo-tiff` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `gufo-tiff` (lib test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "8a74cc3d50468e6b2bf6199b04d35b7b50c9d3f9dc9fd44c3c1387225e504e1e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a74cc3d50468e6b2bf6199b04d35b7b50c9d3f9dc9fd44c3c1387225e504e1e", kill_on_drop: false }`
[INFO] [stdout] 8a74cc3d50468e6b2bf6199b04d35b7b50c9d3f9dc9fd44c3c1387225e504e1e