[INFO] updating cached repository damody/Improve
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/damody/Improve
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/damody/Improve" "work/ex/pr-60944/sources/master#589beb979c0f1a9736e02e578913db88398c3ba5/gh/damody/Improve"`
[INFO] [stderr] Cloning into 'work/ex/pr-60944/sources/master#589beb979c0f1a9736e02e578913db88398c3ba5/gh/damody/Improve'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/damody/Improve" "work/ex/pr-60944/sources/try#42445ded8fd34235a676755cb5d079658ed51f6a/gh/damody/Improve"`
[INFO] [stderr] Cloning into 'work/ex/pr-60944/sources/try#42445ded8fd34235a676755cb5d079658ed51f6a/gh/damody/Improve'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9bde0f95594ae85ed7ca8dd8f9feab37dec56cfc
[INFO] sha for GitHub repo damody/Improve: 9bde0f95594ae85ed7ca8dd8f9feab37dec56cfc
[INFO] validating manifest of damody/Improve on toolchain master#589beb979c0f1a9736e02e578913db88398c3ba5
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+589beb979c0f1a9736e02e578913db88398c3ba5-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of damody/Improve on toolchain try#42445ded8fd34235a676755cb5d079658ed51f6a
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+42445ded8fd34235a676755cb5d079658ed51f6a-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing damody/Improve
[INFO] finished frobbing damody/Improve
[INFO] frobbed toml for damody/Improve written to work/ex/pr-60944/sources/master#589beb979c0f1a9736e02e578913db88398c3ba5/gh/damody/Improve/Cargo.toml
[INFO] started frobbing damody/Improve
[INFO] finished frobbing damody/Improve
[INFO] frobbed toml for damody/Improve written to work/ex/pr-60944/sources/try#42445ded8fd34235a676755cb5d079658ed51f6a/gh/damody/Improve/Cargo.toml
[INFO] crate damody/Improve already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+589beb979c0f1a9736e02e578913db88398c3ba5-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+42445ded8fd34235a676755cb5d079658ed51f6a-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] checking damody/Improve against master#589beb979c0f1a9736e02e578913db88398c3ba5 for pr-60944
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60944/worker-4/master#589beb979c0f1a9736e02e578913db88398c3ba5:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60944/sources/master#589beb979c0f1a9736e02e578913db88398c3ba5/gh/damody/Improve:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+589beb979c0f1a9736e02e578913db88398c3ba5-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 6982d3d7030c575ef308baba3c2e3e1a5845c76b6a89bf00ebb59fc604bbc7ce
[INFO] running `"docker" "start" "-a" "6982d3d7030c575ef308baba3c2e3e1a5845c76b6a89bf00ebb59fc604bbc7ce"`
[INFO] [stderr]     Checking improve v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `SubCommand`
[INFO] [stderr]  --> src/main.rs:5:22
[INFO] [stderr]   |
[INFO] [stderr] 5 | use clap::{Arg, App, SubCommand};
[INFO] [stderr]   |                      ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]   --> src/main.rs:48:12
[INFO] [stderr]    |
[INFO] [stderr] 48 |         if (dur1.num_seconds() <= 0) {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `dur2`
[INFO] [stderr]   --> src/main.rs:55:13
[INFO] [stderr]    |
[INFO] [stderr] 55 |         let dur2 = d3.signed_duration_since(d1);
[INFO] [stderr]    |             ^^^^ help: consider prefixing with an underscore: `_dur2`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `SubCommand`
[INFO] [stderr]  --> src/main.rs:5:22
[INFO] [stderr]   |
[INFO] [stderr] 5 | use clap::{Arg, App, SubCommand};
[INFO] [stderr]   |                      ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]   --> src/main.rs:48:12
[INFO] [stderr]    |
[INFO] [stderr] 48 |         if (dur1.num_seconds() <= 0) {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `dur2`
[INFO] [stderr]   --> src/main.rs:55:13
[INFO] [stderr]    |
[INFO] [stderr] 55 |         let dur2 = d3.signed_duration_since(d1);
[INFO] [stderr]    |             ^^^^ help: consider prefixing with an underscore: `_dur2`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.17s
[INFO] running `"docker" "inspect" "6982d3d7030c575ef308baba3c2e3e1a5845c76b6a89bf00ebb59fc604bbc7ce"`
[INFO] running `"docker" "rm" "-f" "6982d3d7030c575ef308baba3c2e3e1a5845c76b6a89bf00ebb59fc604bbc7ce"`
[INFO] [stdout] 6982d3d7030c575ef308baba3c2e3e1a5845c76b6a89bf00ebb59fc604bbc7ce