[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 master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmmmpa%2Flearning_storage_engine" "/workspace/builds/worker-82/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-82/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mmmpa/learning_storage_engine on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "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-82/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" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e136f445209ad2df0eb9f6ca9a5afacdd8cdc70dbeba65e9f664c9d00c303dc9
[INFO] running `Command { std: "docker" "start" "-a" "e136f445209ad2df0eb9f6ca9a5afacdd8cdc70dbeba65e9f664c9d00c303dc9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e136f445209ad2df0eb9f6ca9a5afacdd8cdc70dbeba65e9f664c9d00c303dc9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e136f445209ad2df0eb9f6ca9a5afacdd8cdc70dbeba65e9f664c9d00c303dc9", kill_on_drop: false }`
[INFO] [stdout] e136f445209ad2df0eb9f6ca9a5afacdd8cdc70dbeba65e9f664c9d00c303dc9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/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=forbid" "-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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c797fdaa05f3ba121dc9e4d7698c0c05ca06424220be482a76add5a704493a47
[INFO] running `Command { std: "docker" "start" "-a" "c797fdaa05f3ba121dc9e4d7698c0c05ca06424220be482a76add5a704493a47", kill_on_drop: false }`
[INFO] [stderr]    Compiling rand_core v0.4.0
[INFO] [stderr]    Compiling autocfg v0.1.2
[INFO] [stderr]    Compiling libc v0.2.54
[INFO] [stderr]    Compiling intrusive-collections v0.7.8
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling rand_jitter v0.1.4
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]    Compiling rand_isaac v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand v0.6.5
[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" "c797fdaa05f3ba121dc9e4d7698c0c05ca06424220be482a76add5a704493a47", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c797fdaa05f3ba121dc9e4d7698c0c05ca06424220be482a76add5a704493a47", kill_on_drop: false }`
[INFO] [stdout] c797fdaa05f3ba121dc9e4d7698c0c05ca06424220be482a76add5a704493a47