[INFO] updating cached repository https://github.com/Steampunkery/roguelike
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/Steampunkery/roguelike
[INFO] [stderr]  + f7a947b...826a53d action_classes -> action_classes  (forced update)
[INFO] [stderr]    6b8fbf1..f8efc18  master         -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f8efc18a607fe94c05ce92b7332ebfc425a34288
[INFO] testing Steampunkery/roguelike against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2FSteampunkery%2Froguelike" "work/builds/worker-7/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Steampunkery/roguelike on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/Steampunkery/roguelike
[INFO] finished tweaking git repo https://github.com/Steampunkery/roguelike
[INFO] tweaked toml for git repo https://github.com/Steampunkery/roguelike written to work/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/Steampunkery/roguelike already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 4223aef1cb00e1fc6748f7ef82230f6043594aac4acf87031b54ba1381fd0632
[INFO] running `"docker" "start" "-a" "4223aef1cb00e1fc6748f7ef82230f6043594aac4acf87031b54ba1381fd0632"`
[INFO] [stderr]    Compiling proc-macro2 v1.0.4
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]    Compiling tcod-sys v5.0.1
[INFO] [stderr]    Compiling hashbrown v0.6.0
[INFO] [stderr]    Compiling itertools v0.8.0
[INFO] [stderr]    Compiling dirs-sys v0.3.4
[INFO] [stderr]    Compiling rand_isaac v0.2.0
[INFO] [stderr]    Compiling dirs v2.0.2
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]    Compiling pathfinding v1.1.12
[INFO] [stderr]    Compiling proc-macro-hack v0.5.9
[INFO] [stderr]    Compiling const-random-macro v0.1.6
[INFO] [stderr]    Compiling const-random v0.1.6
[INFO] [stderr]    Compiling ahash v0.2.13
[INFO] [stderr]    Compiling tcod v0.15.0
[INFO] [stderr]    Compiling roguelike v0.1.0 (/opt/rustwide/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(box_syntax)]
[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 `roguelike`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "4223aef1cb00e1fc6748f7ef82230f6043594aac4acf87031b54ba1381fd0632"`
[INFO] running `"docker" "rm" "-f" "4223aef1cb00e1fc6748f7ef82230f6043594aac4acf87031b54ba1381fd0632"`
[INFO] [stdout] 4223aef1cb00e1fc6748f7ef82230f6043594aac4acf87031b54ba1381fd0632