[INFO] crate mamba 0.3.0 is already in cache
[INFO] testing mamba-0.3.0 against beta-2020-06-03 for beta-1.45-1
[INFO] extracting crate mamba 0.3.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate mamba 0.3.0 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 mamba 0.3.0
[INFO] finished tweaking crates.io crate mamba 0.3.0
[INFO] tweaked toml for crates.io crate mamba 0.3.0 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate mamba 0.3.0 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-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] c5e3ae654160c8c2056754f3d97bfe3b3677f835ffca0cd0d6537a316a25c7f0
[INFO] running `"docker" "start" "-a" "c5e3ae654160c8c2056754f3d97bfe3b3677f835ffca0cd0d6537a316a25c7f0"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling syn v1.0.13
[INFO] [stderr]    Compiling escargot v0.3.1
[INFO] [stderr]    Compiling bytecount v0.3.2
[INFO] [stderr]    Compiling wtf8 v0.0.3
[INFO] [stderr]    Compiling unicode_names2 v0.2.2
[INFO] [stderr]    Compiling pathdiff v0.1.0
[INFO] [stderr]    Compiling num-bigint v0.2.4
[INFO] [stderr]    Compiling predicates v1.0.2
[INFO] [stderr]    Compiling loggerv v0.7.2
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling nom_locate v0.3.1
[INFO] [stderr]    Compiling python-parser v0.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]    Compiling serde_json v1.0.44
[INFO] [stderr]    Compiling assert_cmd v0.10.2
[INFO] [stderr]    Compiling mamba v0.3.0 (/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(drain_filter)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/lex/token.rs:139:9
[INFO] [stderr]     |
[INFO] [stderr] 139 | /         (match self {
[INFO] [stderr] 140 | |             Token::Id(id) => id.len(),
[INFO] [stderr] 141 | |             Token::Real(real) => real.len(),
[INFO] [stderr] 142 | |             Token::Int(int) => int.len(),
[INFO] [stderr] ...   |
[INFO] [stderr] 148 | |             other => format!("{}", other).len()
[INFO] [stderr] 149 | |         } as i32)
[INFO] [stderr]     | |_________________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr] 139 |         match self {
[INFO] [stderr] 140 |             Token::Id(id) => id.len(),
[INFO] [stderr] 141 |             Token::Real(real) => real.len(),
[INFO] [stderr] 142 |             Token::Int(int) => int.len(),
[INFO] [stderr] 143 |             Token::Bool(true) => 4,
[INFO] [stderr] 144 |             Token::Bool(false) => 5,
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `mamba`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "c5e3ae654160c8c2056754f3d97bfe3b3677f835ffca0cd0d6537a316a25c7f0"`
[INFO] running `"docker" "rm" "-f" "c5e3ae654160c8c2056754f3d97bfe3b3677f835ffca0cd0d6537a316a25c7f0"`
[INFO] [stdout] c5e3ae654160c8c2056754f3d97bfe3b3677f835ffca0cd0d6537a316a25c7f0