[INFO] cloning repository https://github.com/augooh/kvstore
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/augooh/kvstore" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faugooh%2Fkvstore", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faugooh%2Fkvstore'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] de57b06feeec598578a16a8c7f0ccc5347638ff9
[INFO] checking augooh/kvstore against 1.95.0 for pr-155915
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faugooh%2Fkvstore" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/augooh/kvstore
[INFO] removed 0 missing examples
[INFO] finished tweaking git repo https://github.com/augooh/kvstore
[INFO] tweaked toml for git repo https://github.com/augooh/kvstore written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/augooh/kvstore on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/augooh/kvstore 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" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rstest v0.2.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1a9eab736d81cbf2b99a3ae13bd94b18cb7892e00a0560cac008ab58346f4562
[INFO] running `Command { std: "docker" "start" "-a" "1a9eab736d81cbf2b99a3ae13bd94b18cb7892e00a0560cac008ab58346f4562", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1a9eab736d81cbf2b99a3ae13bd94b18cb7892e00a0560cac008ab58346f4562", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1a9eab736d81cbf2b99a3ae13bd94b18cb7892e00a0560cac008ab58346f4562", kill_on_drop: false }`
[INFO] [stdout] 1a9eab736d81cbf2b99a3ae13bd94b18cb7892e00a0560cac008ab58346f4562
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9ce5f1047b6dcca22a57fca15d552f775639846a14b68ec5caa0595e84e6574e
[INFO] running `Command { std: "docker" "start" "-a" "9ce5f1047b6dcca22a57fca15d552f775639846a14b68ec5caa0595e84e6574e", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v0.1.8
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling serde v1.0.159
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]    Compiling syn v2.0.13
[INFO] [stderr]     Checking fs2 v0.4.3
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking matches v0.1.10
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking rand_jitter v0.1.4
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling serde_derive v1.0.159
[INFO] [stderr]    Compiling rstest v0.2.2
[INFO] [stderr]     Checking serde_json v1.0.95
[INFO] [stderr]     Checking kvstore v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/extenders.rs:12:20
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn ladd<V>(&mut self, value: &V) -> KeyValueDbListExtender
[INFO] [stdout]    |                    ^^^^^^^^^                ^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                    |
[INFO] [stdout]    |                    the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn ladd<V>(&mut self, value: &V) -> KeyValueDbListExtender<'_>
[INFO] [stdout]    |                                                                   ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/extenders.rs:20:30
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub fn lextend<'i, V, I>(&mut self, seq: I) -> KeyValueDbListExtender
[INFO] [stdout]    |                              ^^^^^^^^^             ^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                              |
[INFO] [stdout]    |                              the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub fn lextend<'i, V, I>(&mut self, seq: I) -> KeyValueDbListExtender<'_>
[INFO] [stdout]    |                                                                          ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/keyvaluedb.rs:319:20
[INFO] [stdout]     |
[INFO] [stdout] 319 |     pub fn lcreate(&mut self, name: &str) -> Result<KeyValueDbListExtender> {
[INFO] [stdout]     |                    ^^^^^^^^^                        ^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                    |
[INFO] [stdout]     |                    the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 319 |     pub fn lcreate(&mut self, name: &str) -> Result<KeyValueDbListExtender<'_>> {
[INFO] [stdout]     |                                                                           ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/keyvaluedb.rs:336:20
[INFO] [stdout]     |
[INFO] [stdout] 336 |     pub fn ladd<V>(&mut self, name: &str, value: &V) -> Option<KeyValueDbListExtender>
[INFO] [stdout]     |                    ^^^^^^^^^ the lifetime is elided here       ^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 336 |     pub fn ladd<V>(&mut self, name: &str, value: &V) -> Option<KeyValueDbListExtender<'_>>
[INFO] [stdout]     |                                                                                      ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/keyvaluedb.rs:343:30
[INFO] [stdout]     |
[INFO] [stdout] 343 |     pub fn lextend<'a, V, I>(&mut self, name: &str, seq: I) -> Option<KeyValueDbListExtender>
[INFO] [stdout]     |                              ^^^^^^^^^ the lifetime is elided here    ^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 343 |     pub fn lextend<'a, V, I>(&mut self, name: &str, seq: I) -> Option<KeyValueDbListExtender<'_>>
[INFO] [stdout]     |                                                                                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/keyvaluedb.rs:466:17
[INFO] [stdout]     |
[INFO] [stdout] 466 |     pub fn iter(&self) -> KeyValueDbIterator {
[INFO] [stdout]     |                 ^^^^^     ^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 466 |     pub fn iter(&self) -> KeyValueDbIterator<'_> {
[INFO] [stdout]     |                                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/keyvaluedb.rs:473:18
[INFO] [stdout]     |
[INFO] [stdout] 473 |     pub fn liter(&self, name: &str) -> KeyValueDbListIterator {
[INFO] [stdout]     |                  ^^^^^                 ^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 473 |     pub fn liter(&self, name: &str) -> KeyValueDbListIterator<'_> {
[INFO] [stdout]     |                                                              ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/extenders.rs:12:20
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn ladd<V>(&mut self, value: &V) -> KeyValueDbListExtender
[INFO] [stdout]    |                    ^^^^^^^^^                ^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                    |
[INFO] [stdout]    |                    the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn ladd<V>(&mut self, value: &V) -> KeyValueDbListExtender<'_>
[INFO] [stdout]    |                                                                   ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/extenders.rs:20:30
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub fn lextend<'i, V, I>(&mut self, seq: I) -> KeyValueDbListExtender
[INFO] [stdout]    |                              ^^^^^^^^^             ^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                              |
[INFO] [stdout]    |                              the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub fn lextend<'i, V, I>(&mut self, seq: I) -> KeyValueDbListExtender<'_>
[INFO] [stdout]    |                                                                          ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/keyvaluedb.rs:319:20
[INFO] [stdout]     |
[INFO] [stdout] 319 |     pub fn lcreate(&mut self, name: &str) -> Result<KeyValueDbListExtender> {
[INFO] [stdout]     |                    ^^^^^^^^^                        ^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                    |
[INFO] [stdout]     |                    the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 319 |     pub fn lcreate(&mut self, name: &str) -> Result<KeyValueDbListExtender<'_>> {
[INFO] [stdout]     |                                                                           ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/keyvaluedb.rs:336:20
[INFO] [stdout]     |
[INFO] [stdout] 336 |     pub fn ladd<V>(&mut self, name: &str, value: &V) -> Option<KeyValueDbListExtender>
[INFO] [stdout]     |                    ^^^^^^^^^ the lifetime is elided here       ^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 336 |     pub fn ladd<V>(&mut self, name: &str, value: &V) -> Option<KeyValueDbListExtender<'_>>
[INFO] [stdout]     |                                                                                      ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/keyvaluedb.rs:343:30
[INFO] [stdout]     |
[INFO] [stdout] 343 |     pub fn lextend<'a, V, I>(&mut self, name: &str, seq: I) -> Option<KeyValueDbListExtender>
[INFO] [stdout]     |                              ^^^^^^^^^ the lifetime is elided here    ^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 343 |     pub fn lextend<'a, V, I>(&mut self, name: &str, seq: I) -> Option<KeyValueDbListExtender<'_>>
[INFO] [stdout]     |                                                                                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/keyvaluedb.rs:466:17
[INFO] [stdout]     |
[INFO] [stdout] 466 |     pub fn iter(&self) -> KeyValueDbIterator {
[INFO] [stdout]     |                 ^^^^^     ^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 466 |     pub fn iter(&self) -> KeyValueDbIterator<'_> {
[INFO] [stdout]     |                                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/keyvaluedb.rs:473:18
[INFO] [stdout]     |
[INFO] [stdout] 473 |     pub fn liter(&self, name: &str) -> KeyValueDbListIterator {
[INFO] [stdout]     |                  ^^^^^                 ^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 473 |     pub fn liter(&self, name: &str) -> KeyValueDbListIterator<'_> {
[INFO] [stdout]     |                                                              ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> examples/clapgui/src/main.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |         let mut input_string = input.trim().to_owned();
[INFO] [stdout]    |             ----^^^^^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TcpStream`
[INFO] [stdout]  --> examples/server/src/main.rs:2:29
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::net::{TcpListener, TcpStream};
[INFO] [stdout]   |                             ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `response` is never read
[INFO] [stdout]   --> examples/server/src/main.rs:69:24
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let mut response = String::new();
[INFO] [stdout]    |                        ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> examples/server/src/main.rs:75:13
[INFO] [stdout]    |
[INFO] [stdout] 75 |             db.set(key, &value);
[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] 75 |             let _ = db.set(key, &value);
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> examples/server/src/main.rs:88:17
[INFO] [stdout]    |
[INFO] [stdout] 88 |                 db.rem(&key);
[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] 88 |                 let _ = db.rem(&key);
[INFO] [stdout]    |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 20.65s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: syn v0.14.9
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 2`
[INFO] running `Command { std: "docker" "inspect" "9ce5f1047b6dcca22a57fca15d552f775639846a14b68ec5caa0595e84e6574e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ce5f1047b6dcca22a57fca15d552f775639846a14b68ec5caa0595e84e6574e", kill_on_drop: false }`
[INFO] [stdout] 9ce5f1047b6dcca22a57fca15d552f775639846a14b68ec5caa0595e84e6574e
