[INFO] updating cached repository cthi/json_parse
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/cthi/json_parse
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/cthi/json_parse" "work/ex/beta-1.38-1/sources/1.37.0/gh/cthi/json_parse"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/cthi/json_parse'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/cthi/json_parse" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cthi/json_parse"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cthi/json_parse'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9f6266ca5ef908fc30d245dc98864db1e69a5606
[INFO] sha for GitHub repo cthi/json_parse: 9f6266ca5ef908fc30d245dc98864db1e69a5606
[INFO] validating manifest of cthi/json_parse 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 cthi/json_parse 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 cthi/json_parse
[INFO] finished frobbing cthi/json_parse
[INFO] frobbed toml for cthi/json_parse written to work/ex/beta-1.38-1/sources/1.37.0/gh/cthi/json_parse/Cargo.toml
[INFO] started frobbing cthi/json_parse
[INFO] finished frobbing cthi/json_parse
[INFO] frobbed toml for cthi/json_parse written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cthi/json_parse/Cargo.toml
[INFO] crate cthi/json_parse 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing cthi/json_parse 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/cthi/json_parse:/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] f0263ee1eeb09bb9c3c194e9b88e21beb4080cb6f295d9b90fb3cf2ce6a95af9
[INFO] running `"docker" "start" "-a" "f0263ee1eeb09bb9c3c194e9b88e21beb4080cb6f295d9b90fb3cf2ce6a95af9"`
[INFO] [stderr]    Compiling json_parse v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(option_filter)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/lex.rs:79:16
[INFO] [stderr]    |
[INFO] [stderr] 79 |             '1'...'9' => lex_number(&mut chars),
[INFO] [stderr]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(ellipsis_inclusive_range_patterns)] on by default
[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 `json_parse`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "f0263ee1eeb09bb9c3c194e9b88e21beb4080cb6f295d9b90fb3cf2ce6a95af9"`
[INFO] running `"docker" "rm" "-f" "f0263ee1eeb09bb9c3c194e9b88e21beb4080cb6f295d9b90fb3cf2ce6a95af9"`
[INFO] [stdout] f0263ee1eeb09bb9c3c194e9b88e21beb4080cb6f295d9b90fb3cf2ce6a95af9