[INFO] updating cached repository Geal/generator_nom
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Geal/generator_nom
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Geal/generator_nom" "work/ex/beta-1.38-1/sources/1.37.0/gh/Geal/generator_nom"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Geal/generator_nom'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Geal/generator_nom" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Geal/generator_nom"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Geal/generator_nom'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b7ac3c969ea2ec78bb5b735c2611959b2baaef0e
[INFO] sha for GitHub repo Geal/generator_nom: b7ac3c969ea2ec78bb5b735c2611959b2baaef0e
[INFO] validating manifest of Geal/generator_nom 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 Geal/generator_nom 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 Geal/generator_nom
[INFO] finished frobbing Geal/generator_nom
[INFO] frobbed toml for Geal/generator_nom written to work/ex/beta-1.38-1/sources/1.37.0/gh/Geal/generator_nom/Cargo.toml
[INFO] started frobbing Geal/generator_nom
[INFO] finished frobbing Geal/generator_nom
[INFO] frobbed toml for Geal/generator_nom written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Geal/generator_nom/Cargo.toml
[INFO] crate Geal/generator_nom 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 Geal/generator_nom against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Geal/generator_nom:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 8b1460f5fd242f51b0066e99856d4e200b59a214251af2b02b7605325a0714b6
[INFO] running `"docker" "start" "-a" "8b1460f5fd242f51b0066e99856d4e200b59a214251af2b02b7605325a0714b6"`
[INFO] [stderr]    Compiling libc v0.2.30
[INFO] [stderr]    Compiling circular v0.2.0 (https://github.com/sozu-proxy/circular#3f4a7b6c)
[INFO] [stderr]    Compiling memchr v1.0.1
[INFO] [stderr]    Compiling nom v3.2.0
[INFO] [stderr]    Compiling flavors v0.2.0 (https://github.com/rust-av/flavors#a210b120)
[INFO] [stderr]    Compiling generator_nom v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(generators, generator_trait)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `resume` found for type `[generator@src/main.rs:71:23: 159:4 length:_, file:_, b:_, capacity:_ _]` in the current scope
[INFO] [stderr]    --> src/main.rs:162:21
[INFO] [stderr]     |
[INFO] [stderr] 162 |     match generator.resume() {
[INFO] [stderr]     |                     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `generator_nom`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "8b1460f5fd242f51b0066e99856d4e200b59a214251af2b02b7605325a0714b6"`
[INFO] running `"docker" "rm" "-f" "8b1460f5fd242f51b0066e99856d4e200b59a214251af2b02b7605325a0714b6"`
[INFO] [stdout] 8b1460f5fd242f51b0066e99856d4e200b59a214251af2b02b7605325a0714b6