[INFO] crate svpng 0.1.1 is already in cache
[INFO] extracting crate svpng 0.1.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/svpng/0.1.1
[INFO] extracting crate svpng 0.1.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/svpng/0.1.1
[INFO] validating manifest of svpng-0.1.1 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of svpng-0.1.1 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing svpng-0.1.1
[INFO] removed 1 missing examples
[INFO] finished frobbing svpng-0.1.1
[INFO] frobbed toml for svpng-0.1.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/svpng/0.1.1/Cargo.toml
[INFO] started frobbing svpng-0.1.1
[INFO] removed 1 missing examples
[INFO] finished frobbing svpng-0.1.1
[INFO] frobbed toml for svpng-0.1.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/svpng/0.1.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing svpng-0.1.1 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/svpng/0.1.1:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] af272d9d795a451cdf50fe9e55c403014a5a2296a4e8c6de336466d67ea41946
[INFO] running `"docker" "start" "-a" "af272d9d795a451cdf50fe9e55c403014a5a2296a4e8c6de336466d67ea41946"`
[INFO] [stderr]    Compiling svpng v0.1.1 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.42s
[INFO] running `"docker" "inspect" "af272d9d795a451cdf50fe9e55c403014a5a2296a4e8c6de336466d67ea41946"`
[INFO] running `"docker" "rm" "-f" "af272d9d795a451cdf50fe9e55c403014a5a2296a4e8c6de336466d67ea41946"`
[INFO] [stdout] af272d9d795a451cdf50fe9e55c403014a5a2296a4e8c6de336466d67ea41946
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/svpng/0.1.1:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] ea0ab642130491cb0dc36b2533fcedec4e5ba6d55afc8050b20af653eb70d324
[INFO] running `"docker" "start" "-a" "ea0ab642130491cb0dc36b2533fcedec4e5ba6d55afc8050b20af653eb70d324"`
[INFO] [stderr]    Compiling svpng v0.1.1 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.87s
[INFO] running `"docker" "inspect" "ea0ab642130491cb0dc36b2533fcedec4e5ba6d55afc8050b20af653eb70d324"`
[INFO] running `"docker" "rm" "-f" "ea0ab642130491cb0dc36b2533fcedec4e5ba6d55afc8050b20af653eb70d324"`
[INFO] [stdout] ea0ab642130491cb0dc36b2533fcedec4e5ba6d55afc8050b20af653eb70d324
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/svpng/0.1.1:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 23734df179a0c6f14fd36dfa436cb9547da029876b65f4ce51d1f0e5226f1e22
[INFO] running `"docker" "start" "-a" "23734df179a0c6f14fd36dfa436cb9547da029876b65f4ce51d1f0e5226f1e22"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/svpng-ad8d9a3f11227882
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[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
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests svpng
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs - svpng (line 11) ... 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] help: possible better candidate is found in another module, you can import it into scope
[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 `std::ops::Try`)
[INFO] [stdout]   --> src/lib.rs:21:1
[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]    |
[INFO] [stdout]    = help: the trait `std::ops::Try` is not implemented for `()`
[INFO] [stdout]    = note: required by `std::ops::Try::from_error`
[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
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] running `"docker" "inspect" "23734df179a0c6f14fd36dfa436cb9547da029876b65f4ce51d1f0e5226f1e22"`
[INFO] running `"docker" "rm" "-f" "23734df179a0c6f14fd36dfa436cb9547da029876b65f4ce51d1f0e5226f1e22"`
[INFO] [stdout] 23734df179a0c6f14fd36dfa436cb9547da029876b65f4ce51d1f0e5226f1e22