[INFO] crate cargo-src 0.1.7 is already in cache
[INFO] testing cargo-src-0.1.7 against 1.38.0 for beta-1.39-1
[INFO] extracting crate cargo-src 0.1.7 into work/builds/worker-2/source
[INFO] validating manifest of crates.io crate cargo-src 0.1.7 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 crates.io crate cargo-src 0.1.7
[INFO] finished tweaking crates.io crate cargo-src 0.1.7
[INFO] tweaked toml for crates.io crate cargo-src 0.1.7 written to work/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate cargo-src 0.1.7 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-2/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-2/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] 48ae79f52b5abfd6057df0066a04439d43ff5acbf36792d0e700f74958c21e79
[INFO] running `"docker" "start" "-a" "48ae79f52b5abfd6057df0066a04439d43ff5acbf36792d0e700f74958c21e79"`
[INFO] [stderr]    Compiling libc v0.2.40
[INFO] [stderr]    Compiling nodrop v0.1.12
[INFO] [stderr]    Compiling byteorder v1.2.2
[INFO] [stderr]    Compiling cfg-if v0.1.2
[INFO] [stderr]    Compiling futures v0.1.21
[INFO] [stderr]    Compiling lazycell v0.6.0
[INFO] [stderr]    Compiling lazy_static v1.0.0
[INFO] [stderr]    Compiling slab v0.4.0
[INFO] [stderr]    Compiling cc v1.0.10
[INFO] [stderr]    Compiling version_check v0.1.3
[INFO] [stderr]    Compiling serde v1.0.82
[INFO] [stderr]    Compiling matches v0.1.6
[INFO] [stderr]    Compiling same-file v1.0.2
[INFO] [stderr]    Compiling rustc-demangle v0.1.7
[INFO] [stderr]    Compiling scoped-tls v0.1.1
[INFO] [stderr]    Compiling dtoa v0.4.2
[INFO] [stderr]    Compiling itoa v0.4.1
[INFO] [stderr]    Compiling num-traits v0.2.2
[INFO] [stderr]    Compiling unicode-normalization v0.1.5
[INFO] [stderr]    Compiling bitflags v1.0.1
[INFO] [stderr]    Compiling typed-arena v1.4.0
[INFO] [stderr]    Compiling httparse v1.2.4
[INFO] [stderr]    Compiling rls-blacklist v0.1.2
[INFO] [stderr]    Compiling proc-macro2 v0.3.6
[INFO] [stderr]    Compiling rls-span v0.4.0
[INFO] [stderr]    Compiling regex-syntax v0.5.6
[INFO] [stderr]    Compiling crossbeam-utils v0.3.2
[INFO] [stderr]    Compiling log v0.4.1
[INFO] [stderr]    Compiling crossbeam-utils v0.2.2
[INFO] [stderr]    Compiling arrayvec v0.4.7
[INFO] [stderr]    Compiling unicode-bidi v0.3.4
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rls-span-0.4.0/src/lib.rs:12:1
[INFO] [stderr]    |
[INFO] [stderr] 12 | #![feature(proc_macro)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling radix_trie v0.1.3
[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 `rls-span`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "48ae79f52b5abfd6057df0066a04439d43ff5acbf36792d0e700f74958c21e79"`
[INFO] running `"docker" "rm" "-f" "48ae79f52b5abfd6057df0066a04439d43ff5acbf36792d0e700f74958c21e79"`
[INFO] [stdout] 48ae79f52b5abfd6057df0066a04439d43ff5acbf36792d0e700f74958c21e79