[INFO] updating cached repository aQaTL/idsr
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/aQaTL/idsr
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/aQaTL/idsr" "work/ex/beta-1.38-1/sources/1.37.0/gh/aQaTL/idsr"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/aQaTL/idsr'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/aQaTL/idsr" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/aQaTL/idsr"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/aQaTL/idsr'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4c8eb691176ecc3c1cf34e3c18ecdbb3e76470c7
[INFO] sha for GitHub repo aQaTL/idsr: 4c8eb691176ecc3c1cf34e3c18ecdbb3e76470c7
[INFO] validating manifest of aQaTL/idsr 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 aQaTL/idsr 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 aQaTL/idsr
[INFO] finished frobbing aQaTL/idsr
[INFO] frobbed toml for aQaTL/idsr written to work/ex/beta-1.38-1/sources/1.37.0/gh/aQaTL/idsr/Cargo.toml
[INFO] started frobbing aQaTL/idsr
[INFO] finished frobbing aQaTL/idsr
[INFO] frobbed toml for aQaTL/idsr written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/aQaTL/idsr/Cargo.toml
[INFO] crate aQaTL/idsr 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing aQaTL/idsr 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-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/aQaTL/idsr:/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] 501d4c2a9a6509df3299420e031c521f3c574fe7bcae05f197c0c86abda9efd3
[INFO] running `"docker" "start" "-a" "501d4c2a9a6509df3299420e031c521f3c574fe7bcae05f197c0c86abda9efd3"`
[INFO] [stderr]    Compiling winapi v0.3.6
[INFO] [stderr]    Compiling regex v1.0.6
[INFO] [stderr]    Compiling nuklear-sys v1.33.2
[INFO] [stderr]    Compiling regex-syntax v0.6.3
[INFO] [stderr]    Compiling syn v0.15.22
[INFO] [stderr]    Compiling png v0.12.0
[INFO] [stderr]    Compiling jpeg-decoder v0.1.15
[INFO] [stderr]    Compiling nuklear-rust v0.5.1
[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/nuklear-rust-0.5.1/src/lib.rs:8:41
[INFO] [stderr]   |
[INFO] [stderr] 8 | #![cfg_attr(feature = "rust_allocator", feature(allocator_api, alloc))]
[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 `nuklear-rust`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "501d4c2a9a6509df3299420e031c521f3c574fe7bcae05f197c0c86abda9efd3"`
[INFO] running `"docker" "rm" "-f" "501d4c2a9a6509df3299420e031c521f3c574fe7bcae05f197c0c86abda9efd3"`
[INFO] [stdout] 501d4c2a9a6509df3299420e031c521f3c574fe7bcae05f197c0c86abda9efd3