[INFO] updating cached repository https://github.com/jt-l/kvstore
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ef7ebadde82389c616af24452e5ff45d14d084d7
[INFO] checking jt-l/kvstore against try#13f916f63bc6575d5ff1f989237dfabe88981368 for pr-69880
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjt-l%2Fkvstore" "/workspace/builds/worker-13/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jt-l/kvstore on toolchain 13f916f63bc6575d5ff1f989237dfabe88981368
[INFO] running `"/workspace/cargo-home/bin/cargo" "+13f916f63bc6575d5ff1f989237dfabe88981368" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/jt-l/kvstore
[INFO] finished tweaking git repo https://github.com/jt-l/kvstore
[INFO] tweaked toml for git repo https://github.com/jt-l/kvstore written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/jt-l/kvstore already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+13f916f63bc6575d5ff1f989237dfabe88981368" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+13f916f63bc6575d5ff1f989237dfabe88981368" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 657bc5224552f659f5daace5a00ce82c1d9f47643e90de75443baf31dab6501d
[INFO] running `"docker" "start" "-a" "657bc5224552f659f5daace5a00ce82c1d9f47643e90de75443baf31dab6501d"`
[INFO] [stderr]    Compiling syn v0.15.39
[INFO] [stderr]    Compiling regex v1.1.7
[INFO] [stderr]     Checking normalize-line-endings v0.2.2
[INFO] [stderr]     Checking regex-syntax v0.6.7
[INFO] [stderr]     Checking float-cmp v0.4.0
[INFO] [stderr]    Compiling serde_derive v1.0.94
[INFO] [stderr]     Checking predicates v1.0.1
[INFO] [stderr]     Checking serde v1.0.94
[INFO] [stderr]     Checking serde_json v1.0.40
[INFO] [stderr]     Checking escargot v0.4.0
[INFO] [stderr]     Checking assert_cmd v0.11.1
[INFO] [stderr]     Checking kvstore v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `kvstore`
[INFO] [stderr]   --> src/bin/kvstore.rs:10:13
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let mut kvstore = KvStore::new();
[INFO] [stderr]    |             ^^^^^^^ help: consider prefixing with an underscore: `_kvstore`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `key`
[INFO] [stderr]   --> src/bin/kvstore.rs:56:21
[INFO] [stderr]    |
[INFO] [stderr] 56 |         if let Some(key) = matches.value_of("key") {
[INFO] [stderr]    |                     ^^^ help: consider prefixing with an underscore: `_key`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `key`
[INFO] [stderr]   --> src/bin/kvstore.rs:60:21
[INFO] [stderr]    |
[INFO] [stderr] 60 |         if let Some(key) = matches.value_of("key") {
[INFO] [stderr]    |                     ^^^ help: consider prefixing with an underscore: `_key`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `key`
[INFO] [stderr]   --> src/bin/kvstore.rs:64:21
[INFO] [stderr]    |
[INFO] [stderr] 64 |         if let Some(key) = matches.value_of("key") {
[INFO] [stderr]    |                     ^^^ help: consider prefixing with an underscore: `_key`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `val`
[INFO] [stderr]   --> src/bin/kvstore.rs:65:25
[INFO] [stderr]    |
[INFO] [stderr] 65 |             if let Some(val) = matches.value_of("value") {
[INFO] [stderr]    |                         ^^^ help: consider prefixing with an underscore: `_val`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/kvstore.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let mut kvstore = KvStore::new();
[INFO] [stderr]    |         ----^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `kvstore`
[INFO] [stderr]   --> src/bin/kvstore.rs:10:13
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let mut kvstore = KvStore::new();
[INFO] [stderr]    |             ^^^^^^^ help: consider prefixing with an underscore: `_kvstore`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `key`
[INFO] [stderr]   --> src/bin/kvstore.rs:56:21
[INFO] [stderr]    |
[INFO] [stderr] 56 |         if let Some(key) = matches.value_of("key") {
[INFO] [stderr]    |                     ^^^ help: consider prefixing with an underscore: `_key`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `key`
[INFO] [stderr]   --> src/bin/kvstore.rs:60:21
[INFO] [stderr]    |
[INFO] [stderr] 60 |         if let Some(key) = matches.value_of("key") {
[INFO] [stderr]    |                     ^^^ help: consider prefixing with an underscore: `_key`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `key`
[INFO] [stderr]   --> src/bin/kvstore.rs:64:21
[INFO] [stderr]    |
[INFO] [stderr] 64 |         if let Some(key) = matches.value_of("key") {
[INFO] [stderr]    |                     ^^^ help: consider prefixing with an underscore: `_key`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `val`
[INFO] [stderr]   --> src/bin/kvstore.rs:65:25
[INFO] [stderr]    |
[INFO] [stderr] 65 |             if let Some(val) = matches.value_of("value") {
[INFO] [stderr]    |                         ^^^ help: consider prefixing with an underscore: `_val`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/kvstore.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let mut kvstore = KvStore::new();
[INFO] [stderr]    |         ----^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 37.37s
[INFO] running `"docker" "inspect" "657bc5224552f659f5daace5a00ce82c1d9f47643e90de75443baf31dab6501d"`
[INFO] running `"docker" "rm" "-f" "657bc5224552f659f5daace5a00ce82c1d9f47643e90de75443baf31dab6501d"`
[INFO] [stdout] 657bc5224552f659f5daace5a00ce82c1d9f47643e90de75443baf31dab6501d