[INFO] cloning repository https://github.com/mmmpa/learning_storage_engine
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mmmpa/learning_storage_engine" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmmmpa%2Flearning_storage_engine", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmmmpa%2Flearning_storage_engine'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6bdb87c206a45be350d7c41228ada15cb36e06ce
[INFO] testing mmmpa/learning_storage_engine against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmmmpa%2Flearning_storage_engine" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mmmpa/learning_storage_engine on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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-3/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 `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded intrusive-collections v0.7.8
[INFO] [stderr]   Downloaded bitflags v1.0.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b3a6ae79ba6fcb2dc02eac256cdcee82d3e0907d771aee568a3f3d355be471b1
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "b3a6ae79ba6fcb2dc02eac256cdcee82d3e0907d771aee568a3f3d355be471b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b3a6ae79ba6fcb2dc02eac256cdcee82d3e0907d771aee568a3f3d355be471b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b3a6ae79ba6fcb2dc02eac256cdcee82d3e0907d771aee568a3f3d355be471b1", kill_on_drop: false }`
[INFO] [stdout] b3a6ae79ba6fcb2dc02eac256cdcee82d3e0907d771aee568a3f3d355be471b1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] b0445f2ca8e8553cb4ad4625a3c7f47bd5c46097d174ddaf41a912d42e9d464d
[INFO] running `Command { std: "docker" "start" "-a" "b0445f2ca8e8553cb4ad4625a3c7f47bd5c46097d174ddaf41a912d42e9d464d", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.54
[INFO] [stderr]    Compiling intrusive-collections v0.7.8
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling learning_storage_engine v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `DirEntry`, `ReadDir`
[INFO] [stdout]  --> src/hash_index_compaction.rs:2:28
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::fs::{OpenOptions, ReadDir, DirEntry, File};
[INFO] [stdout]   |                            ^^^^^^^  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Path`
[INFO] [stdout]  --> src/hash_index_compaction.rs:8:17
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::path::{Path, PathBuf};
[INFO] [stdout]   |                 ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `replace`
[INFO] [stdout]  --> src/hash_index_compaction.rs:9:22
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::mem::{swap, replace};
[INFO] [stdout]   |                      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `intrusive_collections::rbtree::RBTree`
[INFO] [stdout]  --> src/log_structured_merged_tree.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use intrusive_collections::rbtree::RBTree;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `KeyAdapter`, `RBTreeLink`
[INFO] [stdout]  --> src/log_structured_merged_tree.rs:8:29
[INFO] [stdout]   |
[INFO] [stdout] 8 | use intrusive_collections::{RBTreeLink, KeyAdapter};
[INFO] [stdout]   |                             ^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `RangeBounds`
[INFO] [stdout]   --> src/log_structured_merged_tree.rs:11:16
[INFO] [stdout]    |
[INFO] [stdout] 11 | use std::ops::{RangeBounds, Range};
[INFO] [stdout]    |                ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0601]: `main` function not found in crate `learning_storage_engine`
[INFO] [stdout]   --> src/main.rs:1:1
[INFO] [stdout]    |
[INFO] [stdout] 1  | / #[macro_use]
[INFO] [stdout] 2  | | extern crate intrusive_collections;
[INFO] [stdout] 3  | | use std::fmt::Debug;
[INFO] [stdout] 4  | |
[INFO] [stdout] ...  |
[INFO] [stdout] 20 | |     }
[INFO] [stdout] 21 | | }
[INFO] [stdout]    | |_^ consider adding a `main` function to `src/main.rs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0601`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `learning_storage_engine` due to 2 previous errors; 7 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "b0445f2ca8e8553cb4ad4625a3c7f47bd5c46097d174ddaf41a912d42e9d464d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b0445f2ca8e8553cb4ad4625a3c7f47bd5c46097d174ddaf41a912d42e9d464d", kill_on_drop: false }`
[INFO] [stdout] b0445f2ca8e8553cb4ad4625a3c7f47bd5c46097d174ddaf41a912d42e9d464d