[INFO] updating cached repository arthurprs/burst-trie
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/arthurprs/burst-trie
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/arthurprs/burst-trie" "work/ex/beta-1.38-1/sources/1.37.0/gh/arthurprs/burst-trie"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/arthurprs/burst-trie'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/arthurprs/burst-trie" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/arthurprs/burst-trie"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/arthurprs/burst-trie'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d0c895a75d2e0db2a691e33b14811eccd64fd5dd
[INFO] sha for GitHub repo arthurprs/burst-trie: d0c895a75d2e0db2a691e33b14811eccd64fd5dd
[INFO] validating manifest of arthurprs/burst-trie 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 arthurprs/burst-trie 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 arthurprs/burst-trie
[INFO] finished frobbing arthurprs/burst-trie
[INFO] frobbed toml for arthurprs/burst-trie written to work/ex/beta-1.38-1/sources/1.37.0/gh/arthurprs/burst-trie/Cargo.toml
[INFO] started frobbing arthurprs/burst-trie
[INFO] finished frobbing arthurprs/burst-trie
[INFO] frobbed toml for arthurprs/burst-trie written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/arthurprs/burst-trie/Cargo.toml
[INFO] crate arthurprs/burst-trie 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing arthurprs/burst-trie 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/arthurprs/burst-trie:/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] 9e6c641653689f84fea70ae6d0afe40ce0115fe709e2dd9d54c9faf2da4ca86d
[INFO] running `"docker" "start" "-a" "9e6c641653689f84fea70ae6d0afe40ce0115fe709e2dd9d54c9faf2da4ca86d"`
[INFO] [stderr]    Compiling burst_trie v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(box_patterns)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | #![feature(asm)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fmt`
[INFO] [stderr]   --> src/map.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 | use std::fmt;
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `burst_trie`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "9e6c641653689f84fea70ae6d0afe40ce0115fe709e2dd9d54c9faf2da4ca86d"`
[INFO] running `"docker" "rm" "-f" "9e6c641653689f84fea70ae6d0afe40ce0115fe709e2dd9d54c9faf2da4ca86d"`
[INFO] [stdout] 9e6c641653689f84fea70ae6d0afe40ce0115fe709e2dd9d54c9faf2da4ca86d