[INFO] cloning repository https://github.com/tendan/simple_db_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tendan/simple_db_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftendan%2Fsimple_db_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftendan%2Fsimple_db_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 891b18ee4634c4d51ecfa645cd27a6034bebcc3b
[INFO] checking tendan/simple_db_rust against master#e9182f195b8505c87c4bd055b9f6e114ccda0981 for pr-144098
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftendan%2Fsimple_db_rust" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/tendan/simple_db_rust
[INFO] finished tweaking git repo https://github.com/tendan/simple_db_rust
[INFO] tweaked toml for git repo https://github.com/tendan/simple_db_rust written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/tendan/simple_db_rust on toolchain e9182f195b8505c87c4bd055b9f6e114ccda0981
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e9182f195b8505c87c4bd055b9f6e114ccda0981" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/tendan/simple_db_rust 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" "+e9182f195b8505c87c4bd055b9f6e114ccda0981" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+e9182f195b8505c87c4bd055b9f6e114ccda0981" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c2496056804560f988198a06a505358c7dd20d1832bd7276fbcb80ebfec25cb8
[INFO] running `Command { std: "docker" "start" "-a" "c2496056804560f988198a06a505358c7dd20d1832bd7276fbcb80ebfec25cb8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c2496056804560f988198a06a505358c7dd20d1832bd7276fbcb80ebfec25cb8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c2496056804560f988198a06a505358c7dd20d1832bd7276fbcb80ebfec25cb8", kill_on_drop: false }`
[INFO] [stdout] c2496056804560f988198a06a505358c7dd20d1832bd7276fbcb80ebfec25cb8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+e9182f195b8505c87c4bd055b9f6e114ccda0981" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1399a7fdd1fa9584561350ec27a4289b66bbbc405f1bfcf8f7c23eec0573eef1
[INFO] running `Command { std: "docker" "start" "-a" "1399a7fdd1fa9584561350ec27a4289b66bbbc405f1bfcf8f7c23eec0573eef1", kill_on_drop: false }`
[INFO] [stderr]     Checking simple_database v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `args`
[INFO] [stdout]   --> src/core/manage.rs:16:22
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn create(&self, args: &str) -> StringOrErrorMessage {
[INFO] [stdout]    |                      ^^^^ help: if this is intentional, prefix it with an underscore: `_args`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `args`
[INFO] [stdout]   --> src/core/manage.rs:19:22
[INFO] [stdout]    |
[INFO] [stdout] 19 |     fn update(&self, args: &str) -> StringOrErrorMessage {
[INFO] [stdout]    |                      ^^^^ help: if this is intentional, prefix it with an underscore: `_args`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `args`
[INFO] [stdout]   --> src/core/manage.rs:22:22
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn delete(&self, args: &str) -> StringOrErrorMessage {
[INFO] [stdout]    |                      ^^^^ help: if this is intentional, prefix it with an underscore: `_args`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `args`
[INFO] [stdout]   --> src/core/manage.rs:27:20
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn open(&self, args: &str) -> StringOrErrorMessage {
[INFO] [stdout]    |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_args`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/core/error.rs:5:20
[INFO] [stdout]   |
[INFO] [stdout] 5 |     NotImplemented(String),
[INFO] [stdout]   |     -------------- ^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 5 -     NotImplemented(String),
[INFO] [stdout] 5 +     NotImplemented(()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Other` is never constructed
[INFO] [stdout]  --> src/core/error.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub enum ErrorMessage {
[INFO] [stdout]   |          ------------ variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 6 |     Other(String)
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `StringOrErrorMessage` is never used
[INFO] [stdout]  --> src/core/manage.rs:3:6
[INFO] [stdout]   |
[INFO] [stdout] 3 | type StringOrErrorMessage = Result<String, ErrorMessage>;
[INFO] [stdout]   |      ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `EntryType` is never used
[INFO] [stdout]  --> src/core/manage.rs:5:6
[INFO] [stdout]   |
[INFO] [stdout] 5 | enum EntryType {
[INFO] [stdout]   |      ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Database` is never constructed
[INFO] [stdout]   --> src/core/manage.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct Database {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Entity` is never constructed
[INFO] [stdout]   --> src/core/manage.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | struct Entity {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `BasicOperations` is never used
[INFO] [stdout]   --> src/core/manage.rs:40:11
[INFO] [stdout]    |
[INFO] [stdout] 40 | pub trait BasicOperations {
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `ReadOperation` is never used
[INFO] [stdout]   --> src/core/manage.rs:48:11
[INFO] [stdout]    |
[INFO] [stdout] 48 | pub trait ReadOperation {
[INFO] [stdout]    |           ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `OpenOperation` is never used
[INFO] [stdout]   --> src/core/manage.rs:52:11
[INFO] [stdout]    |
[INFO] [stdout] 52 | pub trait OpenOperation {
[INFO] [stdout]    |           ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Open` is never constructed
[INFO] [stdout]   --> src/core/command.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 6  | pub enum PromptCommand {
[INFO] [stdout]    |          ------------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 11 |     Open,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `StatusCode` is never used
[INFO] [stdout]   --> src/core/command.rs:16:10
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub enum StatusCode {
[INFO] [stdout]    |          ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `DatabaseOperation` is never constructed
[INFO] [stdout]  --> src/core/operation.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct DatabaseOperation {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `args`
[INFO] [stdout]   --> src/core/manage.rs:16:22
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn create(&self, args: &str) -> StringOrErrorMessage {
[INFO] [stdout]    |                      ^^^^ help: if this is intentional, prefix it with an underscore: `_args`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `args`
[INFO] [stdout]   --> src/core/manage.rs:19:22
[INFO] [stdout]    |
[INFO] [stdout] 19 |     fn update(&self, args: &str) -> StringOrErrorMessage {
[INFO] [stdout]    |                      ^^^^ help: if this is intentional, prefix it with an underscore: `_args`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `args`
[INFO] [stdout]   --> src/core/manage.rs:22:22
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn delete(&self, args: &str) -> StringOrErrorMessage {
[INFO] [stdout]    |                      ^^^^ help: if this is intentional, prefix it with an underscore: `_args`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `args`
[INFO] [stdout]   --> src/core/manage.rs:27:20
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn open(&self, args: &str) -> StringOrErrorMessage {
[INFO] [stdout]    |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_args`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/core/error.rs:5:20
[INFO] [stdout]   |
[INFO] [stdout] 5 |     NotImplemented(String),
[INFO] [stdout]   |     -------------- ^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 5 -     NotImplemented(String),
[INFO] [stdout] 5 +     NotImplemented(()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Other` is never constructed
[INFO] [stdout]  --> src/core/error.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub enum ErrorMessage {
[INFO] [stdout]   |          ------------ variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 6 |     Other(String)
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `StringOrErrorMessage` is never used
[INFO] [stdout]  --> src/core/manage.rs:3:6
[INFO] [stdout]   |
[INFO] [stdout] 3 | type StringOrErrorMessage = Result<String, ErrorMessage>;
[INFO] [stdout]   |      ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `EntryType` is never used
[INFO] [stdout]  --> src/core/manage.rs:5:6
[INFO] [stdout]   |
[INFO] [stdout] 5 | enum EntryType {
[INFO] [stdout]   |      ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Database` is never constructed
[INFO] [stdout]   --> src/core/manage.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct Database {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Entity` is never constructed
[INFO] [stdout]   --> src/core/manage.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | struct Entity {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `BasicOperations` is never used
[INFO] [stdout]   --> src/core/manage.rs:40:11
[INFO] [stdout]    |
[INFO] [stdout] 40 | pub trait BasicOperations {
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `ReadOperation` is never used
[INFO] [stdout]   --> src/core/manage.rs:48:11
[INFO] [stdout]    |
[INFO] [stdout] 48 | pub trait ReadOperation {
[INFO] [stdout]    |           ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `OpenOperation` is never used
[INFO] [stdout]   --> src/core/manage.rs:52:11
[INFO] [stdout]    |
[INFO] [stdout] 52 | pub trait OpenOperation {
[INFO] [stdout]    |           ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Open` is never constructed
[INFO] [stdout]   --> src/core/command.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 6  | pub enum PromptCommand {
[INFO] [stdout]    |          ------------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 11 |     Open,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `StatusCode` is never used
[INFO] [stdout]   --> src/core/command.rs:16:10
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub enum StatusCode {
[INFO] [stdout]    |          ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `DatabaseOperation` is never constructed
[INFO] [stdout]  --> src/core/operation.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct DatabaseOperation {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.32s
[INFO] running `Command { std: "docker" "inspect" "1399a7fdd1fa9584561350ec27a4289b66bbbc405f1bfcf8f7c23eec0573eef1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1399a7fdd1fa9584561350ec27a4289b66bbbc405f1bfcf8f7c23eec0573eef1", kill_on_drop: false }`
[INFO] [stdout] 1399a7fdd1fa9584561350ec27a4289b66bbbc405f1bfcf8f7c23eec0573eef1