[INFO] updating cached repository jD91mZM2/nix-lsp
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jD91mZM2/nix-lsp
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jD91mZM2/nix-lsp" "work/ex/beta-1.38-1/sources/1.37.0/gh/jD91mZM2/nix-lsp"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/jD91mZM2/nix-lsp'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jD91mZM2/nix-lsp" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jD91mZM2/nix-lsp"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jD91mZM2/nix-lsp'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6fac185abca203b870549264a97476cc148c7308
[INFO] sha for GitHub repo jD91mZM2/nix-lsp: 6fac185abca203b870549264a97476cc148c7308
[INFO] validating manifest of jD91mZM2/nix-lsp 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 jD91mZM2/nix-lsp 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 jD91mZM2/nix-lsp
[INFO] finished frobbing jD91mZM2/nix-lsp
[INFO] frobbed toml for jD91mZM2/nix-lsp written to work/ex/beta-1.38-1/sources/1.37.0/gh/jD91mZM2/nix-lsp/Cargo.toml
[INFO] started frobbing jD91mZM2/nix-lsp
[INFO] finished frobbing jD91mZM2/nix-lsp
[INFO] frobbed toml for jD91mZM2/nix-lsp written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jD91mZM2/nix-lsp/Cargo.toml
[INFO] crate jD91mZM2/nix-lsp 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 jD91mZM2/nix-lsp 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/jD91mZM2/nix-lsp:/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] c206345f1b5f69133b4aff7e922c2912956889b30ea18be903aa1f81cdd1e002
[INFO] running `"docker" "start" "-a" "c206345f1b5f69133b4aff7e922c2912956889b30ea18be903aa1f81cdd1e002"`
[INFO] [stderr]    Compiling smol_str v0.1.9
[INFO] [stderr]    Compiling text_unit v0.1.6
[INFO] [stderr]    Compiling rand_os v0.1.1
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]    Compiling syn v0.15.26
[INFO] [stderr]    Compiling url_serde v0.2.0
[INFO] [stderr]    Compiling backtrace v0.3.13
[INFO] [stderr]    Compiling rand v0.6.4
[INFO] [stderr]    Compiling parking_lot_core v0.4.0
[INFO] [stderr]    Compiling parking_lot v0.7.1
[INFO] [stderr]    Compiling rowan v0.3.2
[INFO] [stderr]    Compiling synstructure v0.10.1
[INFO] [stderr]    Compiling serde_derive v1.0.85
[INFO] [stderr]    Compiling num-derive v0.2.4
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling failure v0.1.5
[INFO] [stderr]    Compiling rnix v0.5.1
[INFO] [stderr]    Compiling lsp-types v0.56.0
[INFO] [stderr]    Compiling nix-lsp 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(panic_info_message)]
[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 `nix-lsp`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "c206345f1b5f69133b4aff7e922c2912956889b30ea18be903aa1f81cdd1e002"`
[INFO] running `"docker" "rm" "-f" "c206345f1b5f69133b4aff7e922c2912956889b30ea18be903aa1f81cdd1e002"`
[INFO] [stdout] c206345f1b5f69133b4aff7e922c2912956889b30ea18be903aa1f81cdd1e002