[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] checking mmmpa/learning_storage_engine against master#209b2be09fcaff937480d1fbbe8b31646e361c7a for pr-70917
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmmmpa%2Flearning_storage_engine" "/workspace/builds/worker-2/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mmmpa/learning_storage_engine on toolchain 209b2be09fcaff937480d1fbbe8b31646e361c7a
[INFO] running `"/workspace/cargo-home/bin/cargo" "+209b2be09fcaff937480d1fbbe8b31646e361c7a" "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-2/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" "+209b2be09fcaff937480d1fbbe8b31646e361c7a" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=forbid" "-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" "+209b2be09fcaff937480d1fbbe8b31646e361c7a" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 78950c3bf364c8960503e6d1a2598da394dc23113b587ddee282d8af616cf574
[INFO] running `"docker" "start" "-a" "78950c3bf364c8960503e6d1a2598da394dc23113b587ddee282d8af616cf574"`
[INFO] [stderr]     Checking intrusive-collections v0.7.8
[INFO] [stderr]     Checking 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
[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] [stderr] warning: build failed, waiting for other jobs to finish...
[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] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/log_structured_merged_tree.rs:66:13
[INFO] [stderr]    |
[INFO] [stderr] 66 |         let mut c1 = self.sorted_segment_path();
[INFO] [stderr]    |             ----^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `create_first_segment`
[INFO] [stderr]    --> src/log_structured_merged_tree.rs:155:5
[INFO] [stderr]     |
[INFO] [stderr] 155 |     fn create_first_segment(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/hash_index_compaction.rs:28:9
[INFO] [stderr]    |
[INFO] [stderr] 28 |         s.retrieve();
[INFO] [stderr]    |         ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/log_structured_merged_tree.rs:132:9
[INFO] [stderr]     |
[INFO] [stderr] 132 |         fs::write(self.create_path(last_id), data);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/log_structured_merged_tree.rs:161:9
[INFO] [stderr]     |
[INFO] [stderr] 161 |         fs::write(path, m);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "78950c3bf364c8960503e6d1a2598da394dc23113b587ddee282d8af616cf574"`
[INFO] running `"docker" "rm" "-f" "78950c3bf364c8960503e6d1a2598da394dc23113b587ddee282d8af616cf574"`
[INFO] [stdout] 78950c3bf364c8960503e6d1a2598da394dc23113b587ddee282d8af616cf574
