[INFO] updating cached repository https://github.com/mmmpa/learning_storage_engine
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6bdb87c206a45be350d7c41228ada15cb36e06ce
[INFO] testing mmmpa/learning_storage_engine against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmmmpa%2Flearning_storage_engine" "/workspace/builds/worker-4/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mmmpa/learning_storage_engine on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/mmmpa/learning_storage_engine
[INFO] finished tweaking git repo https://github.com/mmmpa/learning_storage_engine
[INFO] tweaked toml for git repo https://github.com/mmmpa/learning_storage_engine written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/mmmpa/learning_storage_engine 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] [stderr]     Blocking waiting for file lock on package cache
[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] [stdout] 6db39e6fa88d8d296054921c25e51fb00e003ceec998413c22852683441b9710
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "6db39e6fa88d8d296054921c25e51fb00e003ceec998413c22852683441b9710"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling libc v0.2.54
[INFO] [stderr]    Compiling intrusive-collections v0.7.8
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling learning_storage_engine v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #[macro_use]
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `DirEntry`, `ReadDir`
[INFO] [stderr]  --> src/hash_index_compaction.rs:2:28
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::fs::{OpenOptions, ReadDir, DirEntry, File};
[INFO] [stderr]   |                            ^^^^^^^  ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Path`
[INFO] [stderr]  --> src/hash_index_compaction.rs:8:17
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::path::{Path, PathBuf};
[INFO] [stderr]   |                 ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `replace`
[INFO] [stderr]  --> src/hash_index_compaction.rs:9:22
[INFO] [stderr]   |
[INFO] [stderr] 9 | use std::mem::{swap, replace};
[INFO] [stderr]   |                      ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `intrusive_collections::rbtree::RBTree`
[INFO] [stderr]  --> src/log_structured_merged_tree.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use intrusive_collections::rbtree::RBTree;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `KeyAdapter`, `RBTreeLink`
[INFO] [stderr]  --> src/log_structured_merged_tree.rs:8:29
[INFO] [stderr]   |
[INFO] [stderr] 8 | use intrusive_collections::{RBTreeLink, KeyAdapter};
[INFO] [stderr]   |                             ^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `RangeBounds`
[INFO] [stderr]   --> src/log_structured_merged_tree.rs:11:16
[INFO] [stderr]    |
[INFO] [stderr] 11 | use std::ops::{RangeBounds, Range};
[INFO] [stderr]    |                ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `learning_storage_engine`
[INFO] [stderr]   --> src/main.rs:1:1
[INFO] [stderr]    |
[INFO] [stderr] 1  | / #[macro_use]
[INFO] [stderr] 2  | | extern crate intrusive_collections;
[INFO] [stderr] 3  | | use std::fmt::Debug;
[INFO] [stderr] 4  | |
[INFO] [stderr] ...  |
[INFO] [stderr] 20 | |     }
[INFO] [stderr] 21 | | }
[INFO] [stderr]    | |_^ consider adding a `main` function to `src/main.rs`
[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 E0601`.
[INFO] [stderr] error: could not compile `learning_storage_engine`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "6db39e6fa88d8d296054921c25e51fb00e003ceec998413c22852683441b9710"`
[INFO] running `"docker" "rm" "-f" "6db39e6fa88d8d296054921c25e51fb00e003ceec998413c22852683441b9710"`
[INFO] [stdout] 6db39e6fa88d8d296054921c25e51fb00e003ceec998413c22852683441b9710