[INFO] crate joker 0.0.5 is already in cache
[INFO] extracting crate joker 0.0.5 into work/ex/beta-1.37-6/sources/1.36.0/reg/joker/0.0.5
[INFO] extracting crate joker 0.0.5 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/joker/0.0.5
[INFO] validating manifest of joker-0.0.5 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of joker-0.0.5 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing joker-0.0.5
[INFO] removed path dependency unjson from joker-0.0.5
[INFO] finished frobbing joker-0.0.5
[INFO] frobbed toml for joker-0.0.5 written to work/ex/beta-1.37-6/sources/1.36.0/reg/joker/0.0.5/Cargo.toml
[INFO] started frobbing joker-0.0.5
[INFO] removed path dependency unjson from joker-0.0.5
[INFO] finished frobbing joker-0.0.5
[INFO] frobbed toml for joker-0.0.5 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/joker/0.0.5/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing joker-0.0.5 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/joker/0.0.5:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 43f776a0569c6d15040ce412607acbcd26d74f5a1b9ad18380af488cab2af99b
[INFO] running `"docker" "start" "-a" "43f776a0569c6d15040ce412607acbcd26d74f5a1b9ad18380af488cab2af99b"`
[INFO] [stderr]    Compiling serde v0.7.15
[INFO] [stderr]    Compiling serde_json v0.7.4
[INFO] [stderr]    Compiling unjson v0.0.5
[INFO] [stderr]    Compiling joker v0.0.5 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.26s
[INFO] running `"docker" "inspect" "43f776a0569c6d15040ce412607acbcd26d74f5a1b9ad18380af488cab2af99b"`
[INFO] running `"docker" "rm" "-f" "43f776a0569c6d15040ce412607acbcd26d74f5a1b9ad18380af488cab2af99b"`
[INFO] [stdout] 43f776a0569c6d15040ce412607acbcd26d74f5a1b9ad18380af488cab2af99b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/joker/0.0.5:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] c5441da96ca431dd2df3ccbfa13df1211fa885456d507e8e7a75876c97505809
[INFO] running `"docker" "start" "-a" "c5441da96ca431dd2df3ccbfa13df1211fa885456d507e8e7a75876c97505809"`
[INFO] [stderr]    Compiling joker v0.0.5 (/opt/crater/workdir)
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/test.rs:349:29
[INFO] [stderr]     |
[INFO] [stderr] 349 |                     source: format!("{:?}", Value::String(value.to_string())),
[INFO] [stderr]     |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected enum `std::option::Option`, found struct `std::string::String`
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `std::option::Option<std::string::String>`
[INFO] [stderr]                found type `std::string::String`
[INFO] [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] help: try using a variant of the expected type
[INFO] [stderr]     |
[INFO] [stderr] 2   | Some($crate::fmt::format(<$crate::fmt::Arguments>::new_v1(&[""],
[INFO] [stderr] 3   |                                                      &match (&Value::String(value.to_string()),)
[INFO] [stderr] 4   |                                                           {
[INFO] [stderr] 5   |                                                           (arg0,) =>
[INFO] [stderr] 6   |                                                           [<$crate::fmt::ArgumentV1>::new(arg0,
[INFO] [stderr] 7   |                                                                                           $crate::fmt::Debug::fmt)],
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0308`.
[INFO] [stderr] error: Could not compile `joker`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "c5441da96ca431dd2df3ccbfa13df1211fa885456d507e8e7a75876c97505809"`
[INFO] running `"docker" "rm" "-f" "c5441da96ca431dd2df3ccbfa13df1211fa885456d507e8e7a75876c97505809"`
[INFO] [stdout] c5441da96ca431dd2df3ccbfa13df1211fa885456d507e8e7a75876c97505809