[INFO] updating cached repository whl36512/email_client
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/whl36512/email_client
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/whl36512/email_client" "work/ex/beta-1.38-1/sources/1.37.0/gh/whl36512/email_client"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/whl36512/email_client'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/whl36512/email_client" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/whl36512/email_client"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/whl36512/email_client'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e1c6e1394a405f44157823a8a2e9527d0c8b186b
[INFO] sha for GitHub repo whl36512/email_client: e1c6e1394a405f44157823a8a2e9527d0c8b186b
[INFO] validating manifest of whl36512/email_client 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 whl36512/email_client 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 whl36512/email_client
[INFO] finished frobbing whl36512/email_client
[INFO] frobbed toml for whl36512/email_client written to work/ex/beta-1.38-1/sources/1.37.0/gh/whl36512/email_client/Cargo.toml
[INFO] started frobbing whl36512/email_client
[INFO] finished frobbing whl36512/email_client
[INFO] frobbed toml for whl36512/email_client written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/whl36512/email_client/Cargo.toml
[INFO] crate whl36512/email_client already has a lockfile, it will not be regenerated
[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 whl36512/email_client 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/gh/whl36512/email_client:/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] e347127e94fe25e7fcde2b3df946fff9f462cd1ee6eb650fa1bbd457672c6392
[INFO] running `"docker" "start" "-a" "e347127e94fe25e7fcde2b3df946fff9f462cd1ee6eb650fa1bbd457672c6392"`
[INFO] [stderr]    Compiling openssl-sys v0.9.40
[INFO] [stderr]    Compiling email v0.0.20
[INFO] [stderr]    Compiling memchr v2.1.2
[INFO] [stderr]    Compiling hostname v0.1.5
[INFO] [stderr]    Compiling atty v0.2.11
[INFO] [stderr]    Compiling syn v0.15.23
[INFO] [stderr]    Compiling crypto-mac v0.6.2
[INFO] [stderr]    Compiling uuid v0.6.5
[INFO] [stderr]    Compiling chrono v0.4.6
[INFO] [stderr]    Compiling md-5 v0.7.0
[INFO] [stderr]    Compiling hmac v0.6.3
[INFO] [stderr]    Compiling nom v4.1.1
[INFO] [stderr]    Compiling aho-corasick v0.6.9
[INFO] [stderr]    Compiling openssl v0.9.24
[INFO] [stderr]    Compiling regex v1.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.82
[INFO] [stderr]    Compiling native-tls v0.1.5
[INFO] [stderr]    Compiling env_logger v0.6.0
[INFO] [stderr]    Compiling lettre v0.8.3
[INFO] [stderr]    Compiling lettre_email v0.8.3
[INFO] [stderr] error[E0283]: type annotations required: cannot resolve `std::string::String: std::convert::AsRef<_>`
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/lettre_email-0.8.3/src/lib.rs:387:70
[INFO] [stderr]     |
[INFO] [stderr] 387 |         self.add_header(("Content-Type", format!("{}", content_type).as_ref()));
[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 E0283`.
[INFO] [stderr] error: Could not compile `lettre_email`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "e347127e94fe25e7fcde2b3df946fff9f462cd1ee6eb650fa1bbd457672c6392"`
[INFO] running `"docker" "rm" "-f" "e347127e94fe25e7fcde2b3df946fff9f462cd1ee6eb650fa1bbd457672c6392"`
[INFO] [stdout] e347127e94fe25e7fcde2b3df946fff9f462cd1ee6eb650fa1bbd457672c6392