[INFO] updating cached repository pillserg/rs_guessing_game
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/pillserg/rs_guessing_game
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/pillserg/rs_guessing_game" "work/ex/beta-1.38-1/sources/1.37.0/gh/pillserg/rs_guessing_game"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/pillserg/rs_guessing_game'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/pillserg/rs_guessing_game" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pillserg/rs_guessing_game"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pillserg/rs_guessing_game'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 07bd473e361deb8d71f3b6fea3f13280fcdd98c1
[INFO] sha for GitHub repo pillserg/rs_guessing_game: 07bd473e361deb8d71f3b6fea3f13280fcdd98c1
[INFO] validating manifest of pillserg/rs_guessing_game 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 pillserg/rs_guessing_game 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 pillserg/rs_guessing_game
[INFO] finished frobbing pillserg/rs_guessing_game
[INFO] frobbed toml for pillserg/rs_guessing_game written to work/ex/beta-1.38-1/sources/1.37.0/gh/pillserg/rs_guessing_game/Cargo.toml
[INFO] started frobbing pillserg/rs_guessing_game
[INFO] finished frobbing pillserg/rs_guessing_game
[INFO] frobbed toml for pillserg/rs_guessing_game written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pillserg/rs_guessing_game/Cargo.toml
[INFO] crate pillserg/rs_guessing_game 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] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/pillserg/rs_guessing_game/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[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 pillserg/rs_guessing_game against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pillserg/rs_guessing_game:/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-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 047784d87ee58abbc8527ec6e011fb5b4a39100681a6cd6824b3babb7e2ab671
[INFO] running `"docker" "start" "-a" "047784d87ee58abbc8527ec6e011fb5b4a39100681a6cd6824b3babb7e2ab671"`
[INFO] [stderr]    Compiling serde v1.0.99
[INFO] [stderr]    Compiling docopt v1.1.0
[INFO] [stderr]    Compiling guessing_game v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0599]: no method named `decode` found for type `docopt::Docopt` in the current scope
[INFO] [stderr]    --> src/main.rs:118:25
[INFO] [stderr]     |
[INFO] [stderr] 118 |         .and_then(|d| d.decode())
[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 E0599`.
[INFO] [stderr] error: Could not compile `guessing_game`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "047784d87ee58abbc8527ec6e011fb5b4a39100681a6cd6824b3babb7e2ab671"`
[INFO] running `"docker" "rm" "-f" "047784d87ee58abbc8527ec6e011fb5b4a39100681a6cd6824b3babb7e2ab671"`
[INFO] [stdout] 047784d87ee58abbc8527ec6e011fb5b4a39100681a6cd6824b3babb7e2ab671