[INFO] crate stutter-rs 0.1.1 is already in cache
[INFO] testing stutter-rs-0.1.1 against beta-2020-06-03 for beta-1.45-1
[INFO] extracting crate stutter-rs 0.1.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate stutter-rs 0.1.1 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 crates.io crate stutter-rs 0.1.1
[INFO] finished tweaking crates.io crate stutter-rs 0.1.1
[INFO] tweaked toml for crates.io crate stutter-rs 0.1.1 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] warning: only one of `license` or `license-file` is necessary
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] a88201bbecf4b707721e7eb5d4e72f7dfb5a7d9985b5a66855ac34e78ba22b62
[INFO] running `"docker" "start" "-a" "a88201bbecf4b707721e7eb5d4e72f7dfb5a7d9985b5a66855ac34e78ba22b62"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: only one of `license` or `license-file` is necessary
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling cactus v1.0.5
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling colored v1.9.3
[INFO] [stderr]    Compiling stutter-rs v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(box_syntax, box_patterns, fn_traits, nll, iterator_step_by)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/eval/builtins/static_functions.rs:6:21
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub type StaticFn = Fn(Vec<Value>) -> Value;
[INFO] [stderr]   |                     ^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(Vec<Value>) -> Value`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/eval/builtins/language_functions.rs:7:23
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub type LanguageFn = Fn(Vec<Expression>, &mut CallStack) -> Value;
[INFO] [stderr]   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(Vec<Expression>, &mut CallStack) -> Value`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `stutter-rs`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "a88201bbecf4b707721e7eb5d4e72f7dfb5a7d9985b5a66855ac34e78ba22b62"`
[INFO] running `"docker" "rm" "-f" "a88201bbecf4b707721e7eb5d4e72f7dfb5a7d9985b5a66855ac34e78ba22b62"`
[INFO] [stdout] a88201bbecf4b707721e7eb5d4e72f7dfb5a7d9985b5a66855ac34e78ba22b62