[INFO] updating cached repository wh317706/rust_cp_snippets
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/wh317706/rust_cp_snippets
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/wh317706/rust_cp_snippets" "work/ex/beta-1.38-1/sources/1.37.0/gh/wh317706/rust_cp_snippets"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/wh317706/rust_cp_snippets'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/wh317706/rust_cp_snippets" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/wh317706/rust_cp_snippets"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/wh317706/rust_cp_snippets'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7cdd3e3b9648294f6a30faa0367ea364630daa04
[INFO] sha for GitHub repo wh317706/rust_cp_snippets: 7cdd3e3b9648294f6a30faa0367ea364630daa04
[INFO] validating manifest of wh317706/rust_cp_snippets 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 wh317706/rust_cp_snippets 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 wh317706/rust_cp_snippets
[INFO] finished frobbing wh317706/rust_cp_snippets
[INFO] frobbed toml for wh317706/rust_cp_snippets written to work/ex/beta-1.38-1/sources/1.37.0/gh/wh317706/rust_cp_snippets/Cargo.toml
[INFO] started frobbing wh317706/rust_cp_snippets
[INFO] finished frobbing wh317706/rust_cp_snippets
[INFO] frobbed toml for wh317706/rust_cp_snippets written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/wh317706/rust_cp_snippets/Cargo.toml
[INFO] crate wh317706/rust_cp_snippets 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 wh317706/rust_cp_snippets 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-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/wh317706/rust_cp_snippets:/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] 5c981f302f780af313d910ada54bfbfe898b2c2f9c4f2593f22a9b4eddd0eb38
[INFO] running `"docker" "start" "-a" "5c981f302f780af313d910ada54bfbfe898b2c2f9c4f2593f22a9b4eddd0eb38"`
[INFO] [stderr]    Compiling cargo-snippet v0.2.6
[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/cargo-snippet-0.2.6/src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(plugin_registrar, rustc_private)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/cargo-snippet-0.2.6/src/lib.rs:17:28
[INFO] [stderr]    |
[INFO] [stderr] 17 |     reg.register_attribute("snippet".to_owned(), AttributeType::Whitelisted);
[INFO] [stderr]    |                            ^^^^^^^^^^^^^^^^^^^^ expected struct `syntax::ast::Name`, found struct `std::string::String`
[INFO] [stderr]    |
[INFO] [stderr]    = note: expected type `syntax::ast::Name`
[INFO] [stderr]               found type `std::string::String`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0308, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0308`.
[INFO] [stderr] error: Could not compile `cargo-snippet`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "5c981f302f780af313d910ada54bfbfe898b2c2f9c4f2593f22a9b4eddd0eb38"`
[INFO] running `"docker" "rm" "-f" "5c981f302f780af313d910ada54bfbfe898b2c2f9c4f2593f22a9b4eddd0eb38"`
[INFO] [stdout] 5c981f302f780af313d910ada54bfbfe898b2c2f9c4f2593f22a9b4eddd0eb38