[INFO] crate rules 0.0.2 is already in cache
[INFO] testing rules-0.0.2 against 1.44.0 for beta-1.45-1
[INFO] extracting crate rules 0.0.2 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate rules 0.0.2 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 rules 0.0.2
[INFO] finished tweaking crates.io crate rules 0.0.2
[INFO] tweaked toml for crates.io crate rules 0.0.2 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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-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" "+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] 18f9e588f3eb3dccd3da4486eef6d1545e089ac85a0c59f34a565b07e7a33ac9
[INFO] running `"docker" "start" "-a" "18f9e588f3eb3dccd3da4486eef6d1545e089ac85a0c59f34a565b07e7a33ac9"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling rules v0.0.2 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(slice_patterns)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/parse.rs:323:26
[INFO] [stderr]     |
[INFO] [stderr] 323 |                 vec.push(try!(match c {
[INFO] [stderr]     |                          ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/parse.rs:351:33
[INFO] [stderr]     |
[INFO] [stderr] 351 |                 deque.push_back(try!(match c {
[INFO] [stderr]     |                                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/parse.rs:396:27
[INFO] [stderr]     |
[INFO] [stderr] 396 |                 let ast = try!(match c {
[INFO] [stderr]     |                           ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/parse.rs:402:42
[INFO] [stderr]     |
[INFO] [stderr] 402 | ...                   let before = try!(match vec.pop() {
[INFO] [stderr]     |                                    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/range_set.rs:43:34
[INFO] [stderr]    |
[INFO] [stderr] 43 |             if count < len - 1 { try!(write!(f, "{}, ", s)) }
[INFO] [stderr]    |                                  ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `parse::Faction::*`
[INFO] [stderr]  --> src/parse.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use parse::Faction::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Display`
[INFO] [stderr]   --> src/range_set.rs:16:22
[INFO] [stderr]    |
[INFO] [stderr] 16 | use std::fmt::{self, Display};
[INFO] [stderr]    |                      ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `rules`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "18f9e588f3eb3dccd3da4486eef6d1545e089ac85a0c59f34a565b07e7a33ac9"`
[INFO] running `"docker" "rm" "-f" "18f9e588f3eb3dccd3da4486eef6d1545e089ac85a0c59f34a565b07e7a33ac9"`
[INFO] [stdout] 18f9e588f3eb3dccd3da4486eef6d1545e089ac85a0c59f34a565b07e7a33ac9