[INFO] crate log4rs-gelf 0.1.1 is already in cache
[INFO] extracting crate log4rs-gelf 0.1.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/log4rs-gelf/0.1.1
[INFO] extracting crate log4rs-gelf 0.1.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/log4rs-gelf/0.1.1
[INFO] validating manifest of log4rs-gelf-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 log4rs-gelf-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 log4rs-gelf-0.1.1
[INFO] finished frobbing log4rs-gelf-0.1.1
[INFO] frobbed toml for log4rs-gelf-0.1.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/log4rs-gelf/0.1.1/Cargo.toml
[INFO] started frobbing log4rs-gelf-0.1.1
[INFO] finished frobbing log4rs-gelf-0.1.1
[INFO] frobbed toml for log4rs-gelf-0.1.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/log4rs-gelf/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing log4rs-gelf-0.1.1 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/log4rs-gelf/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] d8d6185769a86f9d4c25ff3fd3708ce3acbc43fe5f4ebfb385c96d32d973b0af
[INFO] running `"docker" "start" "-a" "d8d6185769a86f9d4c25ff3fd3708ce3acbc43fe5f4ebfb385c96d32d973b0af"`
[INFO] [stderr] warning: only one of `license` or `license-file` is necessary
[INFO] [stderr]    Compiling serde-value v0.6.0
[INFO] [stderr]    Compiling native-tls v0.2.3
[INFO] [stderr]    Compiling serde-value-utils v0.1.0
[INFO] [stderr]    Compiling serde_gelf v0.1.6
[INFO] [stderr]    Compiling gelf_logger v0.1.2
[INFO] [stderr] error[E0308]: match arms have incompatible types
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/gelf_logger-0.1.2/src/formatter.rs:24:31
[INFO] [stderr]    |
[INFO] [stderr] 22 |               additional_fields: match serde_gelf::to_flat_dict(&additional_fields) {
[INFO] [stderr]    |  ________________________________-
[INFO] [stderr] 23 | |                 Err(_) => BTreeMap::new(),
[INFO] [stderr]    | |                           --------------- this is found to be of type `std::collections::BTreeMap<std::string::String, serde_value::Value>`
[INFO] [stderr] 24 | |                 Ok(values) => values
[INFO] [stderr]    | |                               ^^^^^^ expected struct `std::string::String`, found enum `serde_value::Value`
[INFO] [stderr] 25 | |             },
[INFO] [stderr]    | |_____________- `match` arms have incompatible types
[INFO] [stderr]    |
[INFO] [stderr]    = note: expected type `std::collections::BTreeMap<std::string::String, serde_value::Value>`
[INFO] [stderr]               found type `std::collections::BTreeMap<serde_value::Value, serde_value::Value>`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/gelf_logger-0.1.2/src/formatter.rs:38:39
[INFO] [stderr]    |
[INFO] [stderr] 38 |             .extend_additional_fields(self.default_additional_fields().clone());
[INFO] [stderr]    |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected enum `serde_value::Value`, found struct `std::string::String`
[INFO] [stderr]    |
[INFO] [stderr]    = note: expected type `std::collections::BTreeMap<serde_value::Value, serde_value::Value>`
[INFO] [stderr]               found type `std::collections::BTreeMap<std::string::String, serde_value::Value>`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0308`.
[INFO] [stderr] error: Could not compile `gelf_logger`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "d8d6185769a86f9d4c25ff3fd3708ce3acbc43fe5f4ebfb385c96d32d973b0af"`
[INFO] running `"docker" "rm" "-f" "d8d6185769a86f9d4c25ff3fd3708ce3acbc43fe5f4ebfb385c96d32d973b0af"`
[INFO] [stdout] d8d6185769a86f9d4c25ff3fd3708ce3acbc43fe5f4ebfb385c96d32d973b0af