[INFO] updating cached repository https://github.com/MeisterTea/malabar
[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] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 15fef83aadb9d9d7d01cd0831fc5cde8392a6e81
[INFO] testing MeisterTea/malabar against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2FMeisterTea%2Fmalabar" "work/builds/worker-9/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MeisterTea/malabar 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/MeisterTea/malabar
[INFO] finished tweaking git repo https://github.com/MeisterTea/malabar
[INFO] tweaked toml for git repo https://github.com/MeisterTea/malabar written to work/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/MeisterTea/malabar 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-9/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] b293b585e1cac1be4ae65207511c46c6c47d055d11aff4baea0e1b15e1ae413c
[INFO] running `"docker" "start" "-a" "b293b585e1cac1be4ae65207511c46c6c47d055d11aff4baea0e1b15e1ae413c"`
[INFO] [stderr]    Compiling either v1.5.0
[INFO] [stderr]    Compiling ident_case v1.0.0
[INFO] [stderr]    Compiling gio v0.5.1
[INFO] [stderr]    Compiling cairo-rs v0.5.0
[INFO] [stderr]    Compiling failure_derive v0.1.4
[INFO] [stderr]    Compiling gdk v0.9.0
[INFO] [stderr]    Compiling error-chain v0.11.0
[INFO] [stderr]    Compiling gtk v0.5.0
[INFO] [stderr]    Compiling glib-sys v0.7.0
[INFO] [stderr]    Compiling gobject-sys v0.7.0
[INFO] [stderr]    Compiling gio-sys v0.7.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]    Compiling pango-sys v0.7.0
[INFO] [stderr]    Compiling cairo-sys-rs v0.7.0
[INFO] [stderr]    Compiling libdbus-sys v0.1.4
[INFO] [stderr]    Compiling gtk-sys v0.7.0
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling nix v0.9.0
[INFO] [stderr]    Compiling syn v0.13.11
[INFO] [stderr]    Compiling syn v0.12.15
[INFO] [stderr]    Compiling x11 v2.18.1
[INFO] [stderr]    Compiling syn v0.15.23
[INFO] [stderr]    Compiling chrono v0.4.6
[INFO] [stderr]    Compiling futures-core-preview v0.2.3
[INFO] [stderr]    Compiling atk-sys v0.7.0
[INFO] [stderr]    Compiling gdk-pixbuf-sys v0.7.0
[INFO] [stderr]    Compiling gdk-pixbuf v0.5.0
[INFO] [stderr]    Compiling gdk-sys v0.7.0
[INFO] [stderr]    Compiling derive_is_enum_variant v0.1.1
[INFO] [stderr]    Compiling futures-channel-preview v0.2.2
[INFO] [stderr]    Compiling futures-io-preview v0.2.2
[INFO] [stderr]    Compiling dbus v0.6.3
[INFO] [stderr]    Compiling futures-sink-preview v0.2.2
[INFO] [stderr]    Compiling backtrace v0.3.13
[INFO] [stderr]    Compiling futures-util-preview v0.2.2
[INFO] [stderr]    Compiling x11_get_windows v0.1.0 (https://github.com/HiruNya/x11_get_windows#a5c733b2)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]   --> /opt/rustwide/cargo-home/git/checkouts/x11_get_windows-219f2005d75238ab/a5c733b/src/lib.rs:64:1
[INFO] [stderr]    |
[INFO] [stderr] 64 | #![feature(dbg_macro)]
[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 `x11_get_windows`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "b293b585e1cac1be4ae65207511c46c6c47d055d11aff4baea0e1b15e1ae413c"`
[INFO] running `"docker" "rm" "-f" "b293b585e1cac1be4ae65207511c46c6c47d055d11aff4baea0e1b15e1ae413c"`
[INFO] [stdout] b293b585e1cac1be4ae65207511c46c6c47d055d11aff4baea0e1b15e1ae413c