[INFO] crate inc 0.1.3 is already in cache
[INFO] testing inc-0.1.3 against 1.44.0 for beta-1.45-1
[INFO] extracting crate inc 0.1.3 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate inc 0.1.3 on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate inc 0.1.3
[INFO] finished tweaking crates.io crate inc 0.1.3
[INFO] tweaked toml for crates.io crate inc 0.1.3 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate crates.io crate inc 0.1.3 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+1.44.0" "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] e1f7b937c76197a72c13f1af38f43708dd8f0e3f85959c3ed6ad9abaaade62cd
[INFO] running `"docker" "start" "-a" "e1f7b937c76197a72c13f1af38f43708dd8f0e3f85959c3ed6ad9abaaade62cd"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling winapi v0.3.8
[INFO] [stderr]    Compiling nom v5.0.1
[INFO] [stderr]    Compiling stackvector v1.0.7
[INFO] [stderr]    Compiling lexical-core v0.4.3
[INFO] [stderr]    Compiling winconsole v0.10.0
[INFO] [stderr]    Compiling colored v1.8.0
[INFO] [stderr]    Compiling inc v0.1.3 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(slice_patterns, box_syntax, box_patterns)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around method argument
[INFO] [stderr]   --> src/lang.rs:24:21
[INFO] [stderr]    |
[INFO] [stderr] 24 |     prog.iter().map({ |expr| lift1(s, &expr) }).collect()
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around method argument
[INFO] [stderr]    --> src/lang.rs:130:40
[INFO] [stderr]     |
[INFO] [stderr] 130 |             let body = body.iter().map({ |b| lift1(s, b) }).collect();
[INFO] [stderr]     |                                        ^^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around method argument
[INFO] [stderr]    --> src/lang.rs:135:44
[INFO] [stderr]     |
[INFO] [stderr] 135 |         List(list) => List(list.iter().map({ |l| lift1(s, l) }).collect()),
[INFO] [stderr]     |                                            ^^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around method argument
[INFO] [stderr]    --> src/lang.rs:140:35
[INFO] [stderr]     |
[INFO] [stderr] 140 |             alt: alt.as_ref().map({ |box e| box lift1(s, &e) }),
[INFO] [stderr]     |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around method argument
[INFO] [stderr]    --> src/parser.rs:143:70
[INFO] [stderr]     |
[INFO] [stderr] 143 |     Ok((i, Expr::Cond { pred: box pred, then: box then, alt: alt.map({ |(_, a)| box a }) }))
[INFO] [stderr]     |                                                                      ^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around function argument
[INFO] [stderr]    --> src/parser.rs:171:41
[INFO] [stderr]     |
[INFO] [stderr] 171 |     map(tuple((tag("\'"), identifier)), { |(_, i)| Expr::Symbol(i) })(i)
[INFO] [stderr]     |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around function argument
[INFO] [stderr]    --> src/parser.rs:177:25
[INFO] [stderr]     |
[INFO] [stderr] 177 |         (map(tag("()"), { |_| Expr::Nil })),
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around function argument
[INFO] [stderr]    --> src/parser.rs:308:43
[INFO] [stderr]     |
[INFO] [stderr] 308 |         preceded(tag(r"#\"), map(anychar, { |c: char| c as u8 })),
[INFO] [stderr]     |                                           ^^^^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 8 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `inc`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "e1f7b937c76197a72c13f1af38f43708dd8f0e3f85959c3ed6ad9abaaade62cd"`
[INFO] running `"docker" "rm" "-f" "e1f7b937c76197a72c13f1af38f43708dd8f0e3f85959c3ed6ad9abaaade62cd"`
[INFO] [stdout] e1f7b937c76197a72c13f1af38f43708dd8f0e3f85959c3ed6ad9abaaade62cd