[INFO] updating cached repository nurelin/rust2email
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/nurelin/rust2email
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/nurelin/rust2email" "work/ex/beta-1.37-6/sources/1.36.0/gh/nurelin/rust2email"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/nurelin/rust2email'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/nurelin/rust2email" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/nurelin/rust2email"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/nurelin/rust2email'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 264a266117ae7b750223d6eae07ed5adca854d64
[INFO] sha for GitHub repo nurelin/rust2email: 264a266117ae7b750223d6eae07ed5adca854d64
[INFO] validating manifest of nurelin/rust2email 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 nurelin/rust2email 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 nurelin/rust2email
[INFO] finished frobbing nurelin/rust2email
[INFO] frobbed toml for nurelin/rust2email written to work/ex/beta-1.37-6/sources/1.36.0/gh/nurelin/rust2email/Cargo.toml
[INFO] started frobbing nurelin/rust2email
[INFO] finished frobbing nurelin/rust2email
[INFO] frobbed toml for nurelin/rust2email written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/nurelin/rust2email/Cargo.toml
[INFO] crate nurelin/rust2email already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing nurelin/rust2email against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/nurelin/rust2email:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 105bd26c3b028ef52d96d172022469dfb494d5286374fcf37499505a2129153a
[INFO] running `"docker" "start" "-a" "105bd26c3b028ef52d96d172022469dfb494d5286374fcf37499505a2129153a"`
[INFO] [stderr]    Compiling openssl v0.9.20
[INFO] [stderr]    Compiling crc-core v0.1.0
[INFO] [stderr]    Compiling serde v1.0.19
[INFO] [stderr]    Compiling derive_builder v0.5.0
[INFO] [stderr]    Compiling bufstream v0.1.3
[INFO] [stderr]    Compiling isatty v0.1.5
[INFO] [stderr]    Compiling openssl-sys v0.9.20
[INFO] [stderr]    Compiling encoding_rs v0.6.11
[INFO] [stderr]    Compiling syn v0.9.2
[INFO] [stderr]    Compiling utf-8 v0.6.0
[INFO] [stderr]    Compiling base64 v0.7.0
[INFO] [stderr]    Compiling slog-scope v3.0.0
[INFO] [stderr]    Compiling trackable v0.2.8
[INFO] [stderr]    Compiling uuid v0.5.1
[INFO] [stderr]    Compiling phf_generator v0.7.21
[INFO] [stderr]    Compiling email v0.0.18
[INFO] [stderr]    Compiling crc v1.5.0
[INFO] [stderr]    Compiling slog-stdlog v2.0.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.16
[INFO] [stderr]    Compiling derive_builder_core v0.1.7
[INFO] [stderr]    Compiling string_cache_codegen v0.3.1
[INFO] [stderr]    Compiling phf_codegen v0.7.21
[INFO] [stderr]    Compiling string_cache v0.2.29
[INFO] [stderr]    Compiling slog-async v2.1.0
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]    Compiling serde_derive v1.0.19
[INFO] [stderr]    Compiling backtrace v0.3.3
[INFO] [stderr]    Compiling chrono v0.4.0
[INFO] [stderr]    Compiling tendril v0.2.4
[INFO] [stderr]    Compiling backtrace v0.2.3
[INFO] [stderr]    Compiling tokio-proto v0.1.1
[INFO] [stderr]    Compiling string_cache v0.3.0
[INFO] [stderr]    Compiling html5ever-atoms v0.1.3
[INFO] [stderr]    Compiling error-chain v0.10.0
[INFO] [stderr]    Compiling slog-term v2.2.0
[INFO] [stderr]    Compiling libflate v0.1.12
[INFO] [stderr]    Compiling hyper v0.11.6
[INFO] [stderr]    Compiling quick-xml v0.7.3
[INFO] [stderr]    Compiling quick-xml v0.8.1
[INFO] [stderr]    Compiling html5ever v0.9.0
[INFO] [stderr]    Compiling serde_json v1.0.5
[INFO] [stderr]    Compiling serde_urlencoded v0.5.1
[INFO] [stderr]    Compiling toml v0.4.5
[INFO] [stderr]    Compiling sloggers v0.2.1
[INFO] [stderr]    Compiling atom_syndication v0.5.5
[INFO] [stderr]    Compiling rss v0.7.0
[INFO] [stderr]    Compiling native-tls v0.1.4
[INFO] [stderr]    Compiling tokio-tls v0.1.3
[INFO] [stderr]    Compiling lettre v0.7.0
[INFO] [stderr]    Compiling hyper-tls v0.1.2
[INFO] [stderr]    Compiling reqwest v0.7.3
[INFO] [stderr]    Compiling lettre_email v0.7.0
[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-0.7.0/src/lib.rs:444:70
[INFO] [stderr]     |
[INFO] [stderr] 444 |         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] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "105bd26c3b028ef52d96d172022469dfb494d5286374fcf37499505a2129153a"`
[INFO] running `"docker" "rm" "-f" "105bd26c3b028ef52d96d172022469dfb494d5286374fcf37499505a2129153a"`
[INFO] [stdout] 105bd26c3b028ef52d96d172022469dfb494d5286374fcf37499505a2129153a