[INFO] fetching crate ssearch 0.2.0...
[INFO] testing ssearch-0.2.0 against master#c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38 for pr-146098-7
[INFO] extracting crate ssearch 0.2.0 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate ssearch 0.2.0
[INFO] finished tweaking crates.io crate ssearch 0.2.0
[INFO] tweaked toml for crates.io crate ssearch 0.2.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate ssearch 0.2.0 on toolchain c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 83 packages to latest compatible versions
[INFO] [stderr]       Adding clap v2.34.0 (available: v4.5.51)
[INFO] [stderr]       Adding dirs v2.0.2 (available: v6.0.0)
[INFO] [stderr]       Adding opener v0.4.1 (available: v0.8.3)
[INFO] [stderr]       Adding prettytable-rs v0.8.0 (available: v0.10.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded opener v0.4.1
[INFO] [stderr]   Downloaded dirs v2.0.2
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9332ed57334e7e5daf4cb9bbcbe453c9e0685d40d9092c72a20c43e1cfcd5e7e
[INFO] running `Command { std: "docker" "start" "-a" "9332ed57334e7e5daf4cb9bbcbe453c9e0685d40d9092c72a20c43e1cfcd5e7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9332ed57334e7e5daf4cb9bbcbe453c9e0685d40d9092c72a20c43e1cfcd5e7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9332ed57334e7e5daf4cb9bbcbe453c9e0685d40d9092c72a20c43e1cfcd5e7e", kill_on_drop: false }`
[INFO] [stdout] 9332ed57334e7e5daf4cb9bbcbe453c9e0685d40d9092c72a20c43e1cfcd5e7e
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6a93275866b3b91e1c26159fda720576491ff9436a8ffc4e451903d76e2bc630
[INFO] running `Command { std: "docker" "start" "-a" "6a93275866b3b91e1c26159fda720576491ff9436a8ffc4e451903d76e2bc630", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.103
[INFO] [stderr]    Compiling quote v1.0.42
[INFO] [stderr]    Compiling unicode-ident v1.0.22
[INFO] [stderr]    Compiling stable_deref_trait v1.2.1
[INFO] [stderr]    Compiling writeable v0.6.2
[INFO] [stderr]    Compiling litemap v0.8.1
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]    Compiling icu_normalizer_data v2.1.1
[INFO] [stderr]    Compiling icu_properties_data v2.1.1
[INFO] [stderr]    Compiling memchr v2.7.6
[INFO] [stderr]    Compiling smallvec v1.15.1
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling dirs v1.0.5
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling percent-encoding v2.3.2
[INFO] [stderr]    Compiling serde_json v1.0.145
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling dirs-sys v0.3.7
[INFO] [stderr]    Compiling form_urlencoded v1.2.2
[INFO] [stderr]    Compiling term v0.5.2
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling ansi_term v0.12.1
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling encode_unicode v0.3.6
[INFO] [stderr]    Compiling clap v2.34.0
[INFO] [stderr]    Compiling dirs v2.0.2
[INFO] [stderr]    Compiling opener v0.4.1
[INFO] [stderr]    Compiling csv-core v0.1.13
[INFO] [stderr]    Compiling syn v2.0.110
[INFO] [stderr]    Compiling csv v1.4.0
[INFO] [stderr]    Compiling prettytable-rs v0.8.0
[INFO] [stderr]    Compiling synstructure v0.13.2
[INFO] [stderr]    Compiling zerovec-derive v0.11.2
[INFO] [stderr]    Compiling displaydoc v0.2.5
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling zerofrom-derive v0.1.6
[INFO] [stderr]    Compiling yoke-derive v0.8.1
[INFO] [stderr]    Compiling zerofrom v0.1.6
[INFO] [stderr]    Compiling yoke v0.8.1
[INFO] [stderr]    Compiling zerotrie v0.2.3
[INFO] [stderr]    Compiling zerovec v0.11.5
[INFO] [stderr]    Compiling tinystr v0.8.2
[INFO] [stderr]    Compiling potential_utf v0.1.4
[INFO] [stderr]    Compiling icu_collections v2.1.1
[INFO] [stderr]    Compiling icu_locale_core v2.1.1
[INFO] [stderr]    Compiling icu_provider v2.1.1
[INFO] [stderr]    Compiling icu_normalizer v2.1.1
[INFO] [stderr]    Compiling icu_properties v2.1.1
[INFO] [stderr]    Compiling idna_adapter v1.2.1
[INFO] [stderr]    Compiling idna v1.1.0
[INFO] [stderr]    Compiling url v2.5.7
[INFO] [stderr]    Compiling ssearch v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:181:5
[INFO] [stdout]     |
[INFO] [stdout] 181 |     opener::open(link.as_str());
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 181 |     let _ = opener::open(link.as_str());
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/persistence.rs:1:804
[INFO] [stdout]   |
[INFO] [stdout] 1 | ...ch]) -> PersistenceResult {␍        fs::create_dir(get_location().as_path().parent().unwrap());␍        let file = OpenOptions::ne...
[INFO] [stdout]   |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fs::{File, OpenOptions};␍use std::fs;␍use std::io::BufReader;␍use std::path::{Path, PathBuf};␍use serde_json;␍␍use crate::search::Search;␍␍static FILE_NAME: &str = "ssearch.json";␍␍fn get_location() -> Box<PathBuf> {␍    Box::new(dirs::home_dir().unwrap().join(".ssearch").join(FILE_NAME))␍}␍␍pub trait Persistence<T> {␍    fn write(t: &[T]) -> PersistenceResult;␍    fn load() -> Vec<T>;␍    fn is_already_exits() -> bool;␍    fn update(t: Search) -> PersistenceResult;␍    fn remove(kw: String) -> PersistenceResult;␍}␍␍pub struct FileBasedSearchPersistence;␍␍#[derive(PartialEq)]␍pub enum PersistenceResult {␍    Created,␍    Updated,␍    Deleted,␍    Error,␍    Nothing,␍}␍␍impl Persistence<Search> for FileBasedSearchPersistence {␍    fn write(t: &[Search]) -> PersistenceResult {␍        let _ = fs::create_dir(get_location().as_path().parent().unwrap());␍        let file = OpenOptions::new()␍            .create(true)␍            .read(true)␍            .write(true)␍            .truncate(true)␍            .open(get_location().as_path());␍        if file.is_err() {␍            return PersistenceResult::Error;␍        }␍        let result = serde_json::to_writer(&file.unwrap(), t);␍        if result.is_ok() {␍            result.unwrap();␍            return PersistenceResult::Created;␍        }␍        return PersistenceResult::Error;␍    }␍␍    fn load() -> Vec<Search> {␍        let file = File::open(get_location().as_path()).unwrap();␍        let read = serde_json::from_reader(BufReader::new(file)).unwrap();␍        return serde_json::from_value(read).unwrap();␍    }␍␍    fn is_already_exits() -> bool {␍        return Path::exists(get_location().as_path().parent().unwrap());␍    }␍␍    fn update(t: Search) -> PersistenceResult {␍        let mut contents = FileBasedSearchPersistence::load();␍        let original_size = contents.len();␍        contents.retain(|x| *x != t);␍        if contents.len() < original_size {␍            return PersistenceResult::Updated;␍        }␍        contents.push(t);␍        FileBasedSearchPersistence::write(&contents);␍        return PersistenceResult::Created;␍    }␍␍    fn remove(kw: String) -> PersistenceResult {␍        let mut contents = FileBasedSearchPersistence::load();␍        let original_size = contents.len();␍        contents.retain(|x| x.keyword != kw);␍        if original_size == contents.len() {␍            return PersistenceResult::Nothing;␍        }␍        FileBasedSearchPersistence::write(&contents);␍        return PersistenceResult::Deleted;␍    }␍}␍
[INFO] [stdout]   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 37.45s
[INFO] running `Command { std: "docker" "inspect" "6a93275866b3b91e1c26159fda720576491ff9436a8ffc4e451903d76e2bc630", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6a93275866b3b91e1c26159fda720576491ff9436a8ffc4e451903d76e2bc630", kill_on_drop: false }`
[INFO] [stdout] 6a93275866b3b91e1c26159fda720576491ff9436a8ffc4e451903d76e2bc630
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 52136b7d6b21df92f5b0f6fc927fc23a10c8ca70373852afce1209e06dafc59c
[INFO] running `Command { std: "docker" "start" "-a" "52136b7d6b21df92f5b0f6fc927fc23a10c8ca70373852afce1209e06dafc59c", kill_on_drop: false }`
[INFO] [stderr]    Compiling ssearch v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:181:5
[INFO] [stdout]     |
[INFO] [stdout] 181 |     opener::open(link.as_str());
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 181 |     let _ = opener::open(link.as_str());
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/persistence.rs:1:804
[INFO] [stdout]   |
[INFO] [stdout] 1 | ...ch]) -> PersistenceResult {␍        fs::create_dir(get_location().as_path().parent().unwrap());␍        let file = OpenOptions::ne...
[INFO] [stdout]   |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fs::{File, OpenOptions};␍use std::fs;␍use std::io::BufReader;␍use std::path::{Path, PathBuf};␍use serde_json;␍␍use crate::search::Search;␍␍static FILE_NAME: &str = "ssearch.json";␍␍fn get_location() -> Box<PathBuf> {␍    Box::new(dirs::home_dir().unwrap().join(".ssearch").join(FILE_NAME))␍}␍␍pub trait Persistence<T> {␍    fn write(t: &[T]) -> PersistenceResult;␍    fn load() -> Vec<T>;␍    fn is_already_exits() -> bool;␍    fn update(t: Search) -> PersistenceResult;␍    fn remove(kw: String) -> PersistenceResult;␍}␍␍pub struct FileBasedSearchPersistence;␍␍#[derive(PartialEq)]␍pub enum PersistenceResult {␍    Created,␍    Updated,␍    Deleted,␍    Error,␍    Nothing,␍}␍␍impl Persistence<Search> for FileBasedSearchPersistence {␍    fn write(t: &[Search]) -> PersistenceResult {␍        let _ = fs::create_dir(get_location().as_path().parent().unwrap());␍        let file = OpenOptions::new()␍            .create(true)␍            .read(true)␍            .write(true)␍            .truncate(true)␍            .open(get_location().as_path());␍        if file.is_err() {␍            return PersistenceResult::Error;␍        }␍        let result = serde_json::to_writer(&file.unwrap(), t);␍        if result.is_ok() {␍            result.unwrap();␍            return PersistenceResult::Created;␍        }␍        return PersistenceResult::Error;␍    }␍␍    fn load() -> Vec<Search> {␍        let file = File::open(get_location().as_path()).unwrap();␍        let read = serde_json::from_reader(BufReader::new(file)).unwrap();␍        return serde_json::from_value(read).unwrap();␍    }␍␍    fn is_already_exits() -> bool {␍        return Path::exists(get_location().as_path().parent().unwrap());␍    }␍␍    fn update(t: Search) -> PersistenceResult {␍        let mut contents = FileBasedSearchPersistence::load();␍        let original_size = contents.len();␍        contents.retain(|x| *x != t);␍        if contents.len() < original_size {␍            return PersistenceResult::Updated;␍        }␍        contents.push(t);␍        FileBasedSearchPersistence::write(&contents);␍        return PersistenceResult::Created;␍    }␍␍    fn remove(kw: String) -> PersistenceResult {␍        let mut contents = FileBasedSearchPersistence::load();␍        let original_size = contents.len();␍        contents.retain(|x| x.keyword != kw);␍        if original_size == contents.len() {␍            return PersistenceResult::Nothing;␍        }␍        FileBasedSearchPersistence::write(&contents);␍        return PersistenceResult::Deleted;␍    }␍}␍
[INFO] [stdout]   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.59s
[INFO] running `Command { std: "docker" "inspect" "52136b7d6b21df92f5b0f6fc927fc23a10c8ca70373852afce1209e06dafc59c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "52136b7d6b21df92f5b0f6fc927fc23a10c8ca70373852afce1209e06dafc59c", kill_on_drop: false }`
[INFO] [stdout] 52136b7d6b21df92f5b0f6fc927fc23a10c8ca70373852afce1209e06dafc59c
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 82b5e40bfd02079731a89b4ea29a8cc717cedf66f602a1048386e2ebba7dd22d
[INFO] running `Command { std: "docker" "start" "-a" "82b5e40bfd02079731a89b4ea29a8cc717cedf66f602a1048386e2ebba7dd22d", kill_on_drop: false }`
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:181:5
[INFO] [stderr]     |
[INFO] [stderr] 181 |     opener::open(link.as_str());
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 181 |     let _ = opener::open(link.as_str());
[INFO] [stderr]     |     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]  --> src/persistence.rs:1:804
[INFO] [stderr]   |
[INFO] [stderr] 1 | ...ch]) -> PersistenceResult {␍        fs::create_dir(get_location().as_path().parent().unwrap());␍        let file = OpenOptions::ne...
[INFO] [stderr]   |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::fs::{File, OpenOptions};␍use std::fs;␍use std::io::BufReader;␍use std::path::{Path, PathBuf};␍use serde_json;␍␍use crate::search::Search;␍␍static FILE_NAME: &str = "ssearch.json";␍␍fn get_location() -> Box<PathBuf> {␍    Box::new(dirs::home_dir().unwrap().join(".ssearch").join(FILE_NAME))␍}␍␍pub trait Persistence<T> {␍    fn write(t: &[T]) -> PersistenceResult;␍    fn load() -> Vec<T>;␍    fn is_already_exits() -> bool;␍    fn update(t: Search) -> PersistenceResult;␍    fn remove(kw: String) -> PersistenceResult;␍}␍␍pub struct FileBasedSearchPersistence;␍␍#[derive(PartialEq)]␍pub enum PersistenceResult {␍    Created,␍    Updated,␍    Deleted,␍    Error,␍    Nothing,␍}␍␍impl Persistence<Search> for FileBasedSearchPersistence {␍    fn write(t: &[Search]) -> PersistenceResult {␍        let _ = fs::create_dir(get_location().as_path().parent().unwrap());␍        let file = OpenOptions::new()␍            .create(true)␍            .read(true)␍            .write(true)␍            .truncate(true)␍            .open(get_location().as_path());␍        if file.is_err() {␍            return PersistenceResult::Error;␍        }␍        let result = serde_json::to_writer(&file.unwrap(), t);␍        if result.is_ok() {␍            result.unwrap();␍            return PersistenceResult::Created;␍        }␍        return PersistenceResult::Error;␍    }␍␍    fn load() -> Vec<Search> {␍        let file = File::open(get_location().as_path()).unwrap();␍        let read = serde_json::from_reader(BufReader::new(file)).unwrap();␍        return serde_json::from_value(read).unwrap();␍    }␍␍    fn is_already_exits() -> bool {␍        return Path::exists(get_location().as_path().parent().unwrap());␍    }␍␍    fn update(t: Search) -> PersistenceResult {␍        let mut contents = FileBasedSearchPersistence::load();␍        let original_size = contents.len();␍        contents.retain(|x| *x != t);␍        if contents.len() < original_size {␍            return PersistenceResult::Updated;␍        }␍        contents.push(t);␍        FileBasedSearchPersistence::write(&contents);␍        return PersistenceResult::Created;␍    }␍␍    fn remove(kw: String) -> PersistenceResult {␍        let mut contents = FileBasedSearchPersistence::load();␍        let original_size = contents.len();␍        contents.retain(|x| x.keyword != kw);␍        if original_size == contents.len() {␍            return PersistenceResult::Nothing;␍        }␍        FileBasedSearchPersistence::write(&contents);␍        return PersistenceResult::Deleted;␍    }␍}␍
[INFO] [stderr]   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `ssearch` (bin "ssearch" test) generated 2 warnings
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.15s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/ssearch-932c6b8472bf527a)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "82b5e40bfd02079731a89b4ea29a8cc717cedf66f602a1048386e2ebba7dd22d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "82b5e40bfd02079731a89b4ea29a8cc717cedf66f602a1048386e2ebba7dd22d", kill_on_drop: false }`
[INFO] [stdout] 82b5e40bfd02079731a89b4ea29a8cc717cedf66f602a1048386e2ebba7dd22d
