[INFO] crate webgl 0.1.0 is already in cache
[INFO] extracting crate webgl 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/webgl/0.1.0
[INFO] extracting crate webgl 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/webgl/0.1.0
[INFO] validating manifest of webgl-0.1.0 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 webgl-0.1.0 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 webgl-0.1.0
[INFO] finished frobbing webgl-0.1.0
[INFO] frobbed toml for webgl-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/webgl/0.1.0/Cargo.toml
[INFO] started frobbing webgl-0.1.0
[INFO] finished frobbing webgl-0.1.0
[INFO] frobbed toml for webgl-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/webgl/0.1.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 webgl-0.1.0 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-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/webgl/0.1.0:/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] a769a10ff87c54b6739b40ef2458bd3193c5e9afae600005651bcca566b7c067
[INFO] running `"docker" "start" "-a" "a769a10ff87c54b6739b40ef2458bd3193c5e9afae600005651bcca566b7c067"`
[INFO] [stderr]    Compiling gl_generator v0.8.0
[INFO] [stderr]    Compiling glenum v0.1.1
[INFO] [stderr]    Compiling gl v0.9.0
[INFO] [stderr]    Compiling webgl v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(nll)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `gl` is imported redundantly
[INFO] [stderr]   --> src/webgl_native.rs:17:13
[INFO] [stderr]    |
[INFO] [stderr] 6  | use gl;
[INFO] [stderr]    |     -- the item `gl` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 17 |         use gl;
[INFO] [stderr]    |             ^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[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 `webgl`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "a769a10ff87c54b6739b40ef2458bd3193c5e9afae600005651bcca566b7c067"`
[INFO] running `"docker" "rm" "-f" "a769a10ff87c54b6739b40ef2458bd3193c5e9afae600005651bcca566b7c067"`
[INFO] [stdout] a769a10ff87c54b6739b40ef2458bd3193c5e9afae600005651bcca566b7c067