[INFO] updating cached repository https://github.com/Geal/generator_nom
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b7ac3c969ea2ec78bb5b735c2611959b2baaef0e
[INFO] testing Geal/generator_nom against beta-2020-06-03 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGeal%2Fgenerator_nom" "/workspace/builds/worker-2/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Geal/generator_nom on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/Geal/generator_nom
[INFO] finished tweaking git repo https://github.com/Geal/generator_nom
[INFO] tweaked toml for git repo https://github.com/Geal/generator_nom written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/Geal/generator_nom already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stdout] 024c283208e68b57a5430c14f549912cd52766124c6aae20897431ce14480ac6
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "024c283208e68b57a5430c14f549912cd52766124c6aae20897431ce14480ac6"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[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/rustwide/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 generator `[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]     |                     ^^^^^^ method not found in `[generator@src/main.rs:71:23: 159:4 length:_, file:_, b:_, capacity:_ _]`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Generator`
[INFO] [stderr]   --> src/main.rs:11:16
[INFO] [stderr]    |
[INFO] [stderr] 11 | use std::ops::{Generator, GeneratorState};
[INFO] [stderr]    |                ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors; 1 warning emitted
[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" "024c283208e68b57a5430c14f549912cd52766124c6aae20897431ce14480ac6"`
[INFO] running `"docker" "rm" "-f" "024c283208e68b57a5430c14f549912cd52766124c6aae20897431ce14480ac6"`
[INFO] [stdout] 024c283208e68b57a5430c14f549912cd52766124c6aae20897431ce14480ac6