[INFO] updating cached repository koshkin-kna/maxim_ip_learn
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/koshkin-kna/maxim_ip_learn
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/koshkin-kna/maxim_ip_learn" "work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/koshkin-kna/maxim_ip_learn"`
[INFO] [stderr] Cloning into 'work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/koshkin-kna/maxim_ip_learn'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/koshkin-kna/maxim_ip_learn" "work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/koshkin-kna/maxim_ip_learn"`
[INFO] [stderr] Cloning into 'work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/koshkin-kna/maxim_ip_learn'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 73c9536022d4e65da29f43672355c9cd66b268a3
[INFO] sha for GitHub repo koshkin-kna/maxim_ip_learn: 73c9536022d4e65da29f43672355c9cd66b268a3
[INFO] validating manifest of koshkin-kna/maxim_ip_learn on toolchain master#435236b8877cdb98c82eaebfb7887782277265c5
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of koshkin-kna/maxim_ip_learn on toolchain try#b5c7f157c20453dde8d47371abe73b32351b4e7f
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing koshkin-kna/maxim_ip_learn
[INFO] finished frobbing koshkin-kna/maxim_ip_learn
[INFO] frobbed toml for koshkin-kna/maxim_ip_learn written to work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/koshkin-kna/maxim_ip_learn/Cargo.toml
[INFO] started frobbing koshkin-kna/maxim_ip_learn
[INFO] finished frobbing koshkin-kna/maxim_ip_learn
[INFO] frobbed toml for koshkin-kna/maxim_ip_learn written to work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/koshkin-kna/maxim_ip_learn/Cargo.toml
[INFO] crate koshkin-kna/maxim_ip_learn already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking koshkin-kna/maxim_ip_learn against try#b5c7f157c20453dde8d47371abe73b32351b4e7f for pr-62849
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62849/worker-7/try#b5c7f157c20453dde8d47371abe73b32351b4e7f:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/koshkin-kna/maxim_ip_learn:/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=forbid" "-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" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] f2aa284d3963f508b8f3bd43388202e3588b82f12816e5349e78de4f9f5abfc5
[INFO] running `"docker" "start" "-a" "f2aa284d3963f508b8f3bd43388202e3588b82f12816e5349e78de4f9f5abfc5"`
[INFO] [stderr]    Compiling openssl v0.10.14
[INFO] [stderr]     Checking servo_arc v0.1.1
[INFO] [stderr]     Checking tokio-io v0.1.9
[INFO] [stderr]    Compiling serde_json v1.0.32
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]    Compiling native-tls v0.2.1
[INFO] [stderr]     Checking crossbeam-epoch v0.5.2
[INFO] [stderr]    Compiling cssparser v0.23.10
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]     Checking tendril v0.4.0
[INFO] [stderr]     Checking openssl v0.9.24
[INFO] [stderr]     Checking crossbeam-deque v0.6.1
[INFO] [stderr]     Checking email v0.0.20
[INFO] [stderr]    Compiling string_cache_codegen v0.4.1
[INFO] [stderr]     Checking tokio-threadpool v0.1.7
[INFO] [stderr]     Checking tokio-reactor v0.1.6
[INFO] [stderr]     Checking tokio-codec v0.1.1
[INFO] [stderr]     Checking h2 v0.1.13
[INFO] [stderr]    Compiling selectors v0.19.0
[INFO] [stderr]     Checking tokio-fs v0.1.3
[INFO] [stderr]     Checking tokio-uds v0.2.2
[INFO] [stderr]     Checking tokio-tcp v0.1.2
[INFO] [stderr]     Checking tokio-udp v0.1.2
[INFO] [stderr]     Checking native-tls v0.1.5
[INFO] [stderr]    Compiling string_cache v0.7.3
[INFO] [stderr]    Compiling markup5ever v0.7.3
[INFO] [stderr]     Checking tokio v0.1.11
[INFO] [stderr]     Checking lettre v0.8.2
[INFO] [stderr]     Checking hyper v0.12.12
[INFO] [stderr]     Checking lettre_email v0.8.2
[INFO] [stderr]     Checking hyper-tls v0.3.1
[INFO] [stderr]     Checking reqwest v0.9.3
[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-0.8.2/src/lib.rs:361:70
[INFO] [stderr]     |
[INFO] [stderr] 361 |         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" "f2aa284d3963f508b8f3bd43388202e3588b82f12816e5349e78de4f9f5abfc5"`
[INFO] running `"docker" "rm" "-f" "f2aa284d3963f508b8f3bd43388202e3588b82f12816e5349e78de4f9f5abfc5"`
[INFO] [stdout] f2aa284d3963f508b8f3bd43388202e3588b82f12816e5349e78de4f9f5abfc5