[INFO] updating cached repository autozimu/rust-mock-sample
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/autozimu/rust-mock-sample
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/autozimu/rust-mock-sample" "work/ex/beta-1.38-1/sources/1.37.0/gh/autozimu/rust-mock-sample"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/autozimu/rust-mock-sample'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/autozimu/rust-mock-sample" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/autozimu/rust-mock-sample"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/autozimu/rust-mock-sample'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a4a068b092bdaf3978aecbfcd7646c21b391ec50
[INFO] sha for GitHub repo autozimu/rust-mock-sample: a4a068b092bdaf3978aecbfcd7646c21b391ec50
[INFO] validating manifest of autozimu/rust-mock-sample 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 autozimu/rust-mock-sample 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 autozimu/rust-mock-sample
[INFO] finished frobbing autozimu/rust-mock-sample
[INFO] frobbed toml for autozimu/rust-mock-sample written to work/ex/beta-1.38-1/sources/1.37.0/gh/autozimu/rust-mock-sample/Cargo.toml
[INFO] started frobbing autozimu/rust-mock-sample
[INFO] finished frobbing autozimu/rust-mock-sample
[INFO] frobbed toml for autozimu/rust-mock-sample written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/autozimu/rust-mock-sample/Cargo.toml
[INFO] crate autozimu/rust-mock-sample 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]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing autozimu/rust-mock-sample 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/autozimu/rust-mock-sample:/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] 8cc633ad87ecbfcc35b5347f00f7f468fcd73bc423cec4c65063548e41825c48
[INFO] running `"docker" "start" "-a" "8cc633ad87ecbfcc35b5347f00f7f468fcd73bc423cec4c65063548e41825c48"`
[INFO] [stderr]    Compiling sample v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: function is never used: `hello_world`
[INFO] [stderr]   --> src/main.rs:32:1
[INFO] [stderr]    |
[INFO] [stderr] 32 | fn hello_world(w: impl Watch) -> String {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.61s
[INFO] running `"docker" "inspect" "8cc633ad87ecbfcc35b5347f00f7f468fcd73bc423cec4c65063548e41825c48"`
[INFO] running `"docker" "rm" "-f" "8cc633ad87ecbfcc35b5347f00f7f468fcd73bc423cec4c65063548e41825c48"`
[INFO] [stdout] 8cc633ad87ecbfcc35b5347f00f7f468fcd73bc423cec4c65063548e41825c48
[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/autozimu/rust-mock-sample:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] d06b21e6e754f9063973e1532d041d4f75cef19587ba7b1aa483ff0fda52fdb0
[INFO] running `"docker" "start" "-a" "d06b21e6e754f9063973e1532d041d4f75cef19587ba7b1aa483ff0fda52fdb0"`
[INFO] [stderr]    Compiling proc-macro2 v0.4.28
[INFO] [stderr]    Compiling quote v0.6.12
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling mocktopus_macros v0.7.0
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/mocktopus_macros-0.7.0/src/lib.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | #![feature(proc_macro_diagnostic)]
[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 E0554`.
[INFO] [stderr] error: Could not compile `mocktopus_macros`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "d06b21e6e754f9063973e1532d041d4f75cef19587ba7b1aa483ff0fda52fdb0"`
[INFO] running `"docker" "rm" "-f" "d06b21e6e754f9063973e1532d041d4f75cef19587ba7b1aa483ff0fda52fdb0"`
[INFO] [stdout] d06b21e6e754f9063973e1532d041d4f75cef19587ba7b1aa483ff0fda52fdb0