[INFO] crate libscroll 0.2.4 is already in cache
[INFO] testing libscroll-0.2.4 against 1.44.0 for beta-1.45-1
[INFO] extracting crate libscroll 0.2.4 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate libscroll 0.2.4 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 libscroll 0.2.4
[INFO] finished tweaking crates.io crate libscroll 0.2.4
[INFO] tweaked toml for crates.io crate libscroll 0.2.4 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] 1318da5d703f8ac4b4455c93a01e2992c24093bebbd2c8b1d3a4629c2e0bd0f9
[INFO] running `"docker" "start" "-a" "1318da5d703f8ac4b4455c93a01e2992c24093bebbd2c8b1d3a4629c2e0bd0f9"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling roots v0.0.6
[INFO] [stderr]    Compiling tini v0.1.1
[INFO] [stderr]    Compiling app_dirs v1.2.1
[INFO] [stderr]    Compiling flo_curves v0.3.1
[INFO] [stderr]    Compiling libscroll v0.2.4 (/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(map_first_last)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(half_open_range_patterns)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::borrow::Borrow`
[INFO] [stderr]  --> src/interpolate.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::borrow::Borrow;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fs::File`
[INFO] [stderr]   --> src/lib.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 33 | use std::fs::File;
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]    --> src/interpolate.rs:157:9
[INFO] [stderr]     |
[INFO] [stderr] 155 |           return;
[INFO] [stderr]     |           ------ any code following this expression is unreachable
[INFO] [stderr] 156 | 
[INFO] [stderr] 157 | /         println!("Current events are {{{}}}",
[INFO] [stderr] 158 | |                  self.events.iter().fold(
[INFO] [stderr] 159 | |                      String::new(), |s, evt| { s.to_owned() + &evt.to_string()[..] }));
[INFO] [stderr]     | |_______________________________________________________________________________________^ unreachable statement
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/interpolate.rs:806:9
[INFO] [stderr]     |
[INFO] [stderr] 805 |         panic!("not implemented");
[INFO] [stderr]     |         -------------------------- any code following this expression is unreachable
[INFO] [stderr] 806 |         0.0
[INFO] [stderr]     |         ^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::prelude`
[INFO] [stderr]   --> src/lib.rs:34:5
[INFO] [stderr]    |
[INFO] [stderr] 34 | use std::io::prelude::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors; 5 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `libscroll`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "1318da5d703f8ac4b4455c93a01e2992c24093bebbd2c8b1d3a4629c2e0bd0f9"`
[INFO] running `"docker" "rm" "-f" "1318da5d703f8ac4b4455c93a01e2992c24093bebbd2c8b1d3a4629c2e0bd0f9"`
[INFO] [stdout] 1318da5d703f8ac4b4455c93a01e2992c24093bebbd2c8b1d3a4629c2e0bd0f9