[INFO] crate utf8-decode 1.0.1 is already in cache
[INFO] extracting crate utf8-decode 1.0.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/utf8-decode/1.0.1
[INFO] extracting crate utf8-decode 1.0.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/utf8-decode/1.0.1
[INFO] validating manifest of utf8-decode-1.0.1 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 utf8-decode-1.0.1 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 utf8-decode-1.0.1
[INFO] finished frobbing utf8-decode-1.0.1
[INFO] frobbed toml for utf8-decode-1.0.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/utf8-decode/1.0.1/Cargo.toml
[INFO] started frobbing utf8-decode-1.0.1
[INFO] finished frobbing utf8-decode-1.0.1
[INFO] frobbed toml for utf8-decode-1.0.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/utf8-decode/1.0.1/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] 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 utf8-decode-1.0.1 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/utf8-decode/1.0.1:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] e8ea19666a3de2d796978d644663abbde1b8777e3f97b7e710a3196bd3199f72
[INFO] running `"docker" "start" "-a" "e8ea19666a3de2d796978d644663abbde1b8777e3f97b7e710a3196bd3199f72"`
[INFO] [stderr]    Compiling utf8-decode v1.0.1 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.32s
[INFO] running `"docker" "inspect" "e8ea19666a3de2d796978d644663abbde1b8777e3f97b7e710a3196bd3199f72"`
[INFO] running `"docker" "rm" "-f" "e8ea19666a3de2d796978d644663abbde1b8777e3f97b7e710a3196bd3199f72"`
[INFO] [stdout] e8ea19666a3de2d796978d644663abbde1b8777e3f97b7e710a3196bd3199f72
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/utf8-decode/1.0.1:/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 4ec58a1fbdae3a5b9fa304fc59fc3eec5e999e81f87979132f4337d085874ae2
[INFO] running `"docker" "start" "-a" "4ec58a1fbdae3a5b9fa304fc59fc3eec5e999e81f87979132f4337d085874ae2"`
[INFO] [stderr]    Compiling utf8-decode v1.0.1 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.55s
[INFO] running `"docker" "inspect" "4ec58a1fbdae3a5b9fa304fc59fc3eec5e999e81f87979132f4337d085874ae2"`
[INFO] running `"docker" "rm" "-f" "4ec58a1fbdae3a5b9fa304fc59fc3eec5e999e81f87979132f4337d085874ae2"`
[INFO] [stdout] 4ec58a1fbdae3a5b9fa304fc59fc3eec5e999e81f87979132f4337d085874ae2
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/utf8-decode/1.0.1:/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] b71681fc231029aff5b174db5f37f0a32696dace643c2e774ca39adb6f08f3ca
[INFO] running `"docker" "start" "-a" "b71681fc231029aff5b174db5f37f0a32696dace643c2e774ca39adb6f08f3ca"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/utf8_decode-3730b6eb8c9edaf6
[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
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests utf8-decode
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test src/lib.rs - UnsafeDecoder (line 141) ... FAILED
[INFO] [stdout] test src/safe.rs - safe::Decoder (line 80) ... FAILED
[INFO] [stdout] test src/lib.rs -  (line 9) ... ok
[INFO] [stdout] test src/lib.rs -  (line 35) ... ok
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - UnsafeDecoder (line 141) stdout ----
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `File`
[INFO] [stdout]  --> src/lib.rs:142:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | let file = File::open("file.txt")?;
[INFO] [stdout]   |            ^^^^ use of undeclared type or module `File`
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `UnsafeDecoder`
[INFO] [stdout]  --> src/lib.rs:144:15
[INFO] [stdout]   |
[INFO] [stdout] 5 | let decoder = UnsafeDecoder::new(file.bytes());
[INFO] [stdout]   |               ^^^^^^^^^^^^^ use of undeclared type or module `UnsafeDecoder`
[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:142:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | let file = File::open("file.txt")?;
[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[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:148:17
[INFO] [stdout]   |
[INFO] [stdout] 9 |     string.push(c?);
[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 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0433.
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/safe.rs - safe::Decoder (line 80) stdout ----
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `Decoder`
[INFO] [stdout]  --> src/safe.rs:83:15
[INFO] [stdout]   |
[INFO] [stdout] 5 | let decoder = Decoder::new(bytes.iter().cloned());
[INFO] [stdout]   |               ^^^^^^^ use of undeclared type or module `Decoder`
[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/safe.rs:87:17
[INFO] [stdout]   |
[INFO] [stdout] 9 |     string.push(c?);
[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, E0433.
[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 - UnsafeDecoder (line 141)
[INFO] [stdout]     src/safe.rs - safe::Decoder (line 80)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 2 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] running `"docker" "inspect" "b71681fc231029aff5b174db5f37f0a32696dace643c2e774ca39adb6f08f3ca"`
[INFO] running `"docker" "rm" "-f" "b71681fc231029aff5b174db5f37f0a32696dace643c2e774ca39adb6f08f3ca"`
[INFO] [stdout] b71681fc231029aff5b174db5f37f0a32696dace643c2e774ca39adb6f08f3ca