[INFO] cloning repository https://github.com/saschanaz/leveldb-assignment
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/saschanaz/leveldb-assignment" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsaschanaz%2Fleveldb-assignment", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsaschanaz%2Fleveldb-assignment'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] af062e95ba8d647ebc7b3e8d73f871a2695dc227
[INFO] checking saschanaz/leveldb-assignment against master#8a65ee08296b36342bf7c3cdc15312ccbc357227 for pr-142704
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsaschanaz%2Fleveldb-assignment" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/saschanaz/leveldb-assignment on toolchain 8a65ee08296b36342bf7c3cdc15312ccbc357227
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8a65ee08296b36342bf7c3cdc15312ccbc357227" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/saschanaz/leveldb-assignment
[INFO] finished tweaking git repo https://github.com/saschanaz/leveldb-assignment
[INFO] tweaked toml for git repo https://github.com/saschanaz/leveldb-assignment written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/saschanaz/leveldb-assignment already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8a65ee08296b36342bf7c3cdc15312ccbc357227" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8a65ee08296b36342bf7c3cdc15312ccbc357227" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 819577d04291f73ca0759af22dd26522957b3366cd3e00c38341986c81378e7c
[INFO] running `Command { std: "docker" "start" "-a" "819577d04291f73ca0759af22dd26522957b3366cd3e00c38341986c81378e7c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "819577d04291f73ca0759af22dd26522957b3366cd3e00c38341986c81378e7c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "819577d04291f73ca0759af22dd26522957b3366cd3e00c38341986c81378e7c", kill_on_drop: false }`
[INFO] [stdout] 819577d04291f73ca0759af22dd26522957b3366cd3e00c38341986c81378e7c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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" "RUSTDOCFLAGS=--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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8a65ee08296b36342bf7c3cdc15312ccbc357227" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c18e6194077c95fdf71da4b0b29d4022b90bb709184dfd90b35a17c1978eab0b
[INFO] running `Command { std: "docker" "start" "-a" "c18e6194077c95fdf71da4b0b29d4022b90bb709184dfd90b35a17c1978eab0b", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]    Compiling proc-macro2 v1.0.78
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling cc v1.0.88
[INFO] [stderr]    Compiling anyhow v1.0.80
[INFO] [stderr]    Compiling thiserror v1.0.57
[INFO] [stderr]     Checking ffi-opaque v2.0.1
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]    Compiling cmake v0.1.50
[INFO] [stderr]    Compiling num_cpus v1.16.0
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]    Compiling leveldb-sys v2.0.9
[INFO] [stderr]    Compiling syn v2.0.51
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking tempdir v0.3.7
[INFO] [stderr]    Compiling thiserror-impl v1.0.57
[INFO] [stderr]     Checking leveldb-ffi-exercise v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `PathBuf`
[INFO] [stdout]  --> src/wrapper/handle.rs:4:23
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::path::{Path, PathBuf};
[INFO] [stdout]   |                       ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `iterator::LevelDBIterator`
[INFO] [stdout]  --> src/wrapper.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub use iterator::LevelDBIterator;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `PathBuf`
[INFO] [stdout]  --> src/wrapper/handle.rs:4:23
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::path::{Path, PathBuf};
[INFO] [stdout]   |                       ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `iterator::LevelDBIterator`
[INFO] [stdout]  --> src/wrapper.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub use iterator::LevelDBIterator;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `LevelDBError` is never used
[INFO] [stdout]   --> src/wrapper/handle.rs:16:10
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub enum LevelDBError {
[INFO] [stdout]    |          ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `LevelDBError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LevelDBHandle` is never constructed
[INFO] [stdout]   --> src/wrapper/handle.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub struct LevelDBHandle {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `open`, `put`, `get`, and `iter` are never used
[INFO] [stdout]    --> src/wrapper/handle.rs:28:12
[INFO] [stdout]     |
[INFO] [stdout] 27  | impl LevelDBHandle {
[INFO] [stdout]     | ------------------ associated items in this implementation
[INFO] [stdout] 28  |     pub fn open(name: &Path) -> Result<LevelDBHandle, LevelDBError> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 54  |     pub fn put(&self, key: &[u8], data: &[u8]) -> Result<(), LevelDBError> {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 76  |     pub fn get(&self, key: &[u8]) -> Result<Option<LevelDBValue>, LevelDBError> {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 104 |     pub fn iter(&self) -> LevelDBIterator {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LevelDBOptions` is never constructed
[INFO] [stdout]  --> src/wrapper/options.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct LevelDBOptions {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/wrapper/options.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 9  | impl LevelDBOptions {
[INFO] [stdout]    | ------------------- associated function in this implementation
[INFO] [stdout] 10 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LevelDBReadOptions` is never constructed
[INFO] [stdout]  --> src/wrapper/read_options.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct LevelDBReadOptions {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/wrapper/read_options.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 9  | impl LevelDBReadOptions {
[INFO] [stdout]    | ----------------------- associated function in this implementation
[INFO] [stdout] 10 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LevelDBWriteOptions` is never constructed
[INFO] [stdout]  --> src/wrapper/write_options.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct LevelDBWriteOptions {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/wrapper/write_options.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 9  | impl LevelDBWriteOptions {
[INFO] [stdout]    | ------------------------ associated function in this implementation
[INFO] [stdout] 10 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LevelDBValue` is never constructed
[INFO] [stdout]  --> src/wrapper/value.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct LevelDBValue(NonNull<c_char>, usize);
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]  --> src/wrapper/value.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | impl LevelDBValue {
[INFO] [stdout]   | ----------------- associated function in this implementation
[INFO] [stdout] 8 |     pub fn new(value: NonNull<c_char>, len: usize) -> Self {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LevelDBIterator` is never constructed
[INFO] [stdout]  --> src/wrapper/iterator.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct LevelDBIterator<'a> {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/wrapper/iterator.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl<'a> LevelDBIterator<'a> {
[INFO] [stdout]    | ---------------------------- associated function in this implementation
[INFO] [stdout] 14 |     pub fn new(db: &'a LevelDBHandle) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/wrapper/handle.rs:104:17
[INFO] [stdout]     |
[INFO] [stdout] 104 |     pub fn iter(&self) -> LevelDBIterator {
[INFO] [stdout]     |                 ^^^^^     --------------- the lifetime gets resolved as `'_`
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 this lifetime flows to the output
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 104 |     pub fn iter(&self) -> LevelDBIterator<'_> {
[INFO] [stdout]     |                                          ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/wrapper/handle.rs:104:17
[INFO] [stdout]     |
[INFO] [stdout] 104 |     pub fn iter(&self) -> LevelDBIterator {
[INFO] [stdout]     |                 ^^^^^     --------------- the lifetime gets resolved as `'_`
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 this lifetime flows to the output
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 104 |     pub fn iter(&self) -> LevelDBIterator<'_> {
[INFO] [stdout]     |                                          ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 31.32s
[INFO] running `Command { std: "docker" "inspect" "c18e6194077c95fdf71da4b0b29d4022b90bb709184dfd90b35a17c1978eab0b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c18e6194077c95fdf71da4b0b29d4022b90bb709184dfd90b35a17c1978eab0b", kill_on_drop: false }`
[INFO] [stdout] c18e6194077c95fdf71da4b0b29d4022b90bb709184dfd90b35a17c1978eab0b
