[INFO] crate mon-artist 0.1.3 is already in cache
[INFO] extracting crate mon-artist 0.1.3 into work/ex/beta-1.38-1/sources/1.37.0/reg/mon-artist/0.1.3
[INFO] extracting crate mon-artist 0.1.3 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mon-artist/0.1.3
[INFO] validating manifest of mon-artist-0.1.3 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 mon-artist-0.1.3 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 mon-artist-0.1.3
[INFO] finished frobbing mon-artist-0.1.3
[INFO] frobbed toml for mon-artist-0.1.3 written to work/ex/beta-1.38-1/sources/1.37.0/reg/mon-artist/0.1.3/Cargo.toml
[INFO] started frobbing mon-artist-0.1.3
[INFO] finished frobbing mon-artist-0.1.3
[INFO] frobbed toml for mon-artist-0.1.3 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mon-artist/0.1.3/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] 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing mon-artist-0.1.3 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-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/mon-artist/0.1.3:/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] 060d207d6007eaf6bb96a63849b47821fd344725430ece2f403647420b66558f
[INFO] running `"docker" "start" "-a" "060d207d6007eaf6bb96a63849b47821fd344725430ece2f403647420b66558f"`
[INFO] [stderr]    Compiling lalrpop-intern v0.13.1
[INFO] [stderr]    Compiling tango v0.6.2
[INFO] [stderr]    Compiling itertools v0.5.10
[INFO] [stderr]    Compiling xml-rs v0.2.2
[INFO] [stderr]    Compiling filetime v0.1.15
[INFO] [stderr]    Compiling docopt v0.7.0
[INFO] [stderr] error[E0282]: type annotations needed
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/tango-0.6.2/src/lib.rs:259:66
[INFO] [stderr]     |
[INFO] [stderr] 259 |         for c in self.0.components().skip(1) { p.push(c.as_ref().to_str().expect("how else can I replace root?")); }
[INFO] [stderr]     |                                                                  ^^^^^^ cannot infer type for `T`
[INFO] [stderr]     |
[INFO] [stderr]     = note: type must be known at this point
[INFO] [stderr] 
[INFO] [stderr] error[E0282]: type annotations needed
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/tango-0.6.2/src/lib.rs:273:66
[INFO] [stderr]     |
[INFO] [stderr] 273 |         for c in self.0.components().skip(1) { p.push(c.as_ref().to_str().expect("how else can I replace root?")); }
[INFO] [stderr]     |                                                                  ^^^^^^ cannot infer type for `T`
[INFO] [stderr]     |
[INFO] [stderr]     = note: type must be known at this point
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0282`.
[INFO] [stderr] error: Could not compile `tango`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "060d207d6007eaf6bb96a63849b47821fd344725430ece2f403647420b66558f"`
[INFO] running `"docker" "rm" "-f" "060d207d6007eaf6bb96a63849b47821fd344725430ece2f403647420b66558f"`
[INFO] [stdout] 060d207d6007eaf6bb96a63849b47821fd344725430ece2f403647420b66558f