[INFO] updating cached repository brianp/muxedsnapshot
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/brianp/muxedsnapshot
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/brianp/muxedsnapshot" "work/ex/clippy-test-run/sources/stable/gh/brianp/muxedsnapshot"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/brianp/muxedsnapshot'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/brianp/muxedsnapshot" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/brianp/muxedsnapshot"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/brianp/muxedsnapshot'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8362dd3043db9e481b1aa44de9571df316d545c4
[INFO] sha for GitHub repo brianp/muxedsnapshot: 8362dd3043db9e481b1aa44de9571df316d545c4
[INFO] validating manifest of brianp/muxedsnapshot on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of brianp/muxedsnapshot on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing brianp/muxedsnapshot
[INFO] finished frobbing brianp/muxedsnapshot
[INFO] frobbed toml for brianp/muxedsnapshot written to work/ex/clippy-test-run/sources/stable/gh/brianp/muxedsnapshot/Cargo.toml
[INFO] started frobbing brianp/muxedsnapshot
[INFO] finished frobbing brianp/muxedsnapshot
[INFO] frobbed toml for brianp/muxedsnapshot written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/brianp/muxedsnapshot/Cargo.toml
[INFO] crate brianp/muxedsnapshot has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] linting brianp/muxedsnapshot against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-1/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/brianp/muxedsnapshot:/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=forbid" "-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" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 870f1129ad30e92a0833db29233ab70670ddc01120245e03990a142dc9264b34
[INFO] running `"docker" "start" "-a" "870f1129ad30e92a0833db29233ab70670ddc01120245e03990a142dc9264b34"`
[INFO] [stderr]    Compiling quote v0.3.5
[INFO] [stderr]     Checking serde v0.8.18
[INFO] [stderr]     Checking clap v2.16.3
[INFO] [stderr]    Compiling syn v0.10.3
[INFO] [stderr]    Compiling serde_codegen_internals v0.11.1
[INFO] [stderr]    Compiling serde_codegen v0.8.19
[INFO] [stderr]     Checking serde_test v0.8.18
[INFO] [stderr]     Checking linked-hash-map v0.3.0
[INFO] [stderr]     Checking yaml-rust v0.3.4
[INFO] [stderr]    Compiling serde_derive v0.8.19
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_derive-0.8.19/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(proc_macro, proc_macro_lib)]
[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 `serde_derive`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "870f1129ad30e92a0833db29233ab70670ddc01120245e03990a142dc9264b34"`
[INFO] running `"docker" "rm" "-f" "870f1129ad30e92a0833db29233ab70670ddc01120245e03990a142dc9264b34"`
[INFO] [stdout] 870f1129ad30e92a0833db29233ab70670ddc01120245e03990a142dc9264b34