Dec 05 09:00:30.548 INFO checking podstats-0.1.2 against master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc for pr-56481
Dec 05 09:00:30.548 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-3/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-3/pr-56481/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +c8ae2de8363be088604ffa2ccba84ff7ad7250bc-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 05 09:00:30.890 INFO [stdout] bba6f044d37bcc17897c38a37966eab8a3a7aa48050b6247835564676ba814d6
Dec 05 09:00:30.892 INFO running `"docker" "start" "-a" "bba6f044d37bcc17897c38a37966eab8a3a7aa48050b6247835564676ba814d6"`
Dec 05 09:00:31.794 INFO [stderr] usermod: no changes
Dec 05 09:00:31.888 INFO [stderr]     Checking podstats v0.1.2 (/source)
Dec 05 09:00:33.199 INFO [stderr] warning: unused `#[macro_use]` import
Dec 05 09:00:33.199 INFO [stderr]  --> src/lib.rs:3:1
Dec 05 09:00:33.199 INFO [stderr]   |
Dec 05 09:00:33.199 INFO [stderr] 3 | #[macro_use]
Dec 05 09:00:33.199 INFO [stderr]   | ^^^^^^^^^^^^
Dec 05 09:00:33.199 INFO [stderr]   |
Dec 05 09:00:33.199 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 05 09:00:33.199 INFO [stderr] 
Dec 05 09:00:33.199 INFO [stderr] warning: unused import: `std::fs`
Dec 05 09:00:33.199 INFO [stderr]  --> src/subscription.rs:7:5
Dec 05 09:00:33.199 INFO [stderr]   |
Dec 05 09:00:33.199 INFO [stderr] 7 | use std::fs;
Dec 05 09:00:33.199 INFO [stderr]   |     ^^^^^^^
Dec 05 09:00:33.199 INFO [stderr] 
Dec 05 09:00:33.243 INFO [stderr] warning: unused `#[macro_use]` import
Dec 05 09:00:33.243 INFO [stderr]  --> src/lib.rs:3:1
Dec 05 09:00:33.243 INFO [stderr]   |
Dec 05 09:00:33.243 INFO [stderr] 3 | #[macro_use]
Dec 05 09:00:33.243 INFO [stderr]   | ^^^^^^^^^^^^
Dec 05 09:00:33.243 INFO [stderr]   |
Dec 05 09:00:33.243 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 05 09:00:33.243 INFO [stderr] 
Dec 05 09:00:33.599 INFO [stderr] warning: unused variable: `bytes`
Dec 05 09:00:33.599 INFO [stderr]    --> src/config.rs:166:9
Dec 05 09:00:33.599 INFO [stderr]     |
Dec 05 09:00:33.599 INFO [stderr] 166 |     let bytes = match res {
Dec 05 09:00:33.599 INFO [stderr]     |         ^^^^^ help: consider using `_bytes` instead
Dec 05 09:00:33.599 INFO [stderr]     |
Dec 05 09:00:33.599 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Dec 05 09:00:33.599 INFO [stderr] 
Dec 05 09:00:33.631 INFO [stderr] warning: unused variable: `bytes`
Dec 05 09:00:33.631 INFO [stderr]    --> src/config.rs:166:9
Dec 05 09:00:33.631 INFO [stderr]     |
Dec 05 09:00:33.631 INFO [stderr] 166 |     let bytes = match res {
Dec 05 09:00:33.631 INFO [stderr]     |         ^^^^^ help: consider using `_bytes` instead
Dec 05 09:00:33.631 INFO [stderr]     |
Dec 05 09:00:33.631 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Dec 05 09:00:33.631 INFO [stderr] 
Dec 05 09:00:33.775 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 09:00:33.775 INFO [stderr]    --> src/config.rs:149:9
Dec 05 09:00:33.775 INFO [stderr]     |
Dec 05 09:00:33.775 INFO [stderr] 149 |         file.write_all(b"");
Dec 05 09:00:33.775 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^
Dec 05 09:00:33.775 INFO [stderr]     |
Dec 05 09:00:33.775 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 05 09:00:33.775 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 09:00:33.775 INFO [stderr] 
Dec 05 09:00:33.775 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 09:00:33.775 INFO [stderr]    --> src/config.rs:171:5
Dec 05 09:00:33.775 INFO [stderr]     |
Dec 05 09:00:33.775 INFO [stderr] 171 |     file.flush();
Dec 05 09:00:33.775 INFO [stderr]     |     ^^^^^^^^^^^^^
Dec 05 09:00:33.775 INFO [stderr]     |
Dec 05 09:00:33.775 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 09:00:33.775 INFO [stderr] 
Dec 05 09:00:33.775 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 09:00:33.775 INFO [stderr]    --> src/config.rs:229:9
Dec 05 09:00:33.775 INFO [stderr]     |
Dec 05 09:00:33.775 INFO [stderr] 229 |         fs::remove_file(test_cache_loc);
Dec 05 09:00:33.775 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 09:00:33.775 INFO [stderr]     |
Dec 05 09:00:33.775 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 09:00:33.775 INFO [stderr] 
Dec 05 09:00:33.775 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 09:00:33.775 INFO [stderr]    --> src/subscription.rs:208:5
Dec 05 09:00:33.776 INFO [stderr]     |
Dec 05 09:00:33.776 INFO [stderr] 208 |     fs::remove_file(test_path);
Dec 05 09:00:33.776 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 09:00:33.776 INFO [stderr]     |
Dec 05 09:00:33.776 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 09:00:33.776 INFO [stderr] 
Dec 05 09:00:33.795 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 09:00:33.795 INFO [stderr]    --> src/config.rs:149:9
Dec 05 09:00:33.795 INFO [stderr]     |
Dec 05 09:00:33.795 INFO [stderr] 149 |         file.write_all(b"");
Dec 05 09:00:33.795 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^
Dec 05 09:00:33.795 INFO [stderr]     |
Dec 05 09:00:33.795 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 05 09:00:33.795 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 09:00:33.795 INFO [stderr] 
Dec 05 09:00:33.795 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 09:00:33.795 INFO [stderr]    --> src/config.rs:171:5
Dec 05 09:00:33.795 INFO [stderr]     |
Dec 05 09:00:33.795 INFO [stderr] 171 |     file.flush();
Dec 05 09:00:33.795 INFO [stderr]     |     ^^^^^^^^^^^^^
Dec 05 09:00:33.795 INFO [stderr]     |
Dec 05 09:00:33.795 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 09:00:33.795 INFO [stderr] 
Dec 05 09:00:35.804 INFO [stderr] warning: unused `#[macro_use]` import
Dec 05 09:00:35.804 INFO [stderr]  --> src/main.rs:3:1
Dec 05 09:00:35.804 INFO [stderr]   |
Dec 05 09:00:35.804 INFO [stderr] 3 | #[macro_use]
Dec 05 09:00:35.804 INFO [stderr]   | ^^^^^^^^^^^^
Dec 05 09:00:35.804 INFO [stderr]   |
Dec 05 09:00:35.804 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 05 09:00:35.804 INFO [stderr] 
Dec 05 09:00:35.804 INFO [stderr] warning: unused import: `SubCommand`
Dec 05 09:00:35.804 INFO [stderr]  --> src/main.rs:8:22
Dec 05 09:00:35.804 INFO [stderr]   |
Dec 05 09:00:35.804 INFO [stderr] 8 | use clap::{Arg, App, SubCommand};
Dec 05 09:00:35.804 INFO [stderr]   |                      ^^^^^^^^^^
Dec 05 09:00:35.805 INFO [stderr] 
Dec 05 09:00:35.815 INFO [stderr] warning: unused import: `std::fs`
Dec 05 09:00:35.815 INFO [stderr]  --> src/subscription.rs:7:5
Dec 05 09:00:35.816 INFO [stderr]   |
Dec 05 09:00:35.816 INFO [stderr] 7 | use std::fs;
Dec 05 09:00:35.816 INFO [stderr]   |     ^^^^^^^
Dec 05 09:00:35.816 INFO [stderr] 
Dec 05 09:00:36.335 INFO [stderr] warning: unused `#[macro_use]` import
Dec 05 09:00:36.335 INFO [stderr]  --> src/main.rs:3:1
Dec 05 09:00:36.335 INFO [stderr]   |
Dec 05 09:00:36.335 INFO [stderr] 3 | #[macro_use]
Dec 05 09:00:36.335 INFO [stderr]   | ^^^^^^^^^^^^
Dec 05 09:00:36.343 INFO [stderr]   |
Dec 05 09:00:36.343 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 05 09:00:36.343 INFO [stderr] 
Dec 05 09:00:36.343 INFO [stderr] warning: unused import: `SubCommand`
Dec 05 09:00:36.343 INFO [stderr]  --> src/main.rs:8:22
Dec 05 09:00:36.343 INFO [stderr]   |
Dec 05 09:00:36.343 INFO [stderr] 8 | use clap::{Arg, App, SubCommand};
Dec 05 09:00:36.343 INFO [stderr]   |                      ^^^^^^^^^^
Dec 05 09:00:36.343 INFO [stderr] 
Dec 05 09:00:36.399 INFO [stderr] warning: unused variable: `bytes`
Dec 05 09:00:36.399 INFO [stderr]    --> src/config.rs:166:9
Dec 05 09:00:36.399 INFO [stderr]     |
Dec 05 09:00:36.399 INFO [stderr] 166 |     let bytes = match res {
Dec 05 09:00:36.399 INFO [stderr]     |         ^^^^^ help: consider using `_bytes` instead
Dec 05 09:00:36.399 INFO [stderr]     |
Dec 05 09:00:36.399 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Dec 05 09:00:36.399 INFO [stderr] 
Dec 05 09:00:36.711 INFO [stderr] warning: function is never used: `read_config`
Dec 05 09:00:36.711 INFO [stderr]   --> src/config.rs:89:1
Dec 05 09:00:36.711 INFO [stderr]    |
Dec 05 09:00:36.711 INFO [stderr] 89 | pub fn read_config() -> Option<Config> {
Dec 05 09:00:36.711 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 09:00:36.737 INFO [stderr]    |
Dec 05 09:00:36.738 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 05 09:00:36.738 INFO [stderr] 
Dec 05 09:00:36.738 INFO [stderr] warning: function is never used: `write_config`
Dec 05 09:00:36.738 INFO [stderr]    --> src/config.rs:123:1
Dec 05 09:00:36.738 INFO [stderr]     |
Dec 05 09:00:36.738 INFO [stderr] 123 | pub fn write_config(config: Config) {
Dec 05 09:00:36.738 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 09:00:36.738 INFO [stderr] 
Dec 05 09:00:36.738 INFO [stderr] warning: method is never used: `new`
Dec 05 09:00:36.738 INFO [stderr]   --> src/subscription.rs:24:5
Dec 05 09:00:36.738 INFO [stderr]    |
Dec 05 09:00:36.738 INFO [stderr] 24 |     pub fn new(url: &str, name: &str, directory: Option<&str>) -> Subscription {
Dec 05 09:00:36.738 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 09:00:36.738 INFO [stderr] 
Dec 05 09:00:36.738 INFO [stderr] warning: function is never used: `vec_serialize`
Dec 05 09:00:36.738 INFO [stderr]   --> src/subscription.rs:54:1
Dec 05 09:00:36.738 INFO [stderr]    |
Dec 05 09:00:36.738 INFO [stderr] 54 | pub fn vec_serialize(subs: &Vec<Subscription>) -> Vec<u8> {
Dec 05 09:00:36.738 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 09:00:36.738 INFO [stderr] 
Dec 05 09:00:36.738 INFO [stderr] warning: function is never used: `serialize`
Dec 05 09:00:36.738 INFO [stderr]   --> src/subscription.rs:63:1
Dec 05 09:00:36.738 INFO [stderr]    |
Dec 05 09:00:36.738 INFO [stderr] 63 | pub fn serialize(sub: &Subscription) -> Vec<u8> {
Dec 05 09:00:36.738 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 09:00:36.738 INFO [stderr] 
Dec 05 09:00:36.738 INFO [stderr] warning: function is never used: `deserialize`
Dec 05 09:00:36.738 INFO [stderr]   --> src/subscription.rs:72:1
Dec 05 09:00:36.738 INFO [stderr]    |
Dec 05 09:00:36.738 INFO [stderr] 72 | pub fn deserialize(sub_vec: &Vec<u8>) -> Option<Subscription> {
Dec 05 09:00:36.738 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 09:00:36.738 INFO [stderr] 
Dec 05 09:00:36.738 INFO [stderr] warning: function is never used: `process_directory`
Dec 05 09:00:36.738 INFO [stderr]    --> src/subscription.rs:116:1
Dec 05 09:00:36.738 INFO [stderr]     |
Dec 05 09:00:36.738 INFO [stderr] 116 | fn process_directory(directory: Option<&str>) -> String {
Dec 05 09:00:36.738 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 09:00:36.738 INFO [stderr] 
Dec 05 09:00:36.742 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 09:00:36.742 INFO [stderr]    --> src/config.rs:149:9
Dec 05 09:00:36.742 INFO [stderr]     |
Dec 05 09:00:36.742 INFO [stderr] 149 |         file.write_all(b"");
Dec 05 09:00:36.742 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^
Dec 05 09:00:36.742 INFO [stderr]     |
Dec 05 09:00:36.742 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 05 09:00:36.742 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 09:00:36.742 INFO [stderr] 
Dec 05 09:00:36.742 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 09:00:36.742 INFO [stderr]    --> src/config.rs:171:5
Dec 05 09:00:36.742 INFO [stderr]     |
Dec 05 09:00:36.742 INFO [stderr] 171 |     file.flush();
Dec 05 09:00:36.742 INFO [stderr]     |     ^^^^^^^^^^^^^
Dec 05 09:00:36.742 INFO [stderr]     |
Dec 05 09:00:36.742 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 09:00:36.742 INFO [stderr] 
Dec 05 09:00:36.744 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 09:00:36.744 INFO [stderr]   --> src/util.rs:47:21
Dec 05 09:00:36.744 INFO [stderr]    |
Dec 05 09:00:36.744 INFO [stderr] 47 |                     write!(stdout, "{}", v);
Dec 05 09:00:36.744 INFO [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 09:00:36.744 INFO [stderr]    |
Dec 05 09:00:36.744 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 09:00:36.744 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 05 09:00:36.744 INFO [stderr] 
Dec 05 09:00:37.051 INFO [stderr] warning: unused variable: `bytes`
Dec 05 09:00:37.051 INFO [stderr]    --> src/config.rs:166:9
Dec 05 09:00:37.051 INFO [stderr]     |
Dec 05 09:00:37.051 INFO [stderr] 166 |     let bytes = match res {
Dec 05 09:00:37.051 INFO [stderr]     |         ^^^^^ help: consider using `_bytes` instead
Dec 05 09:00:37.051 INFO [stderr]     |
Dec 05 09:00:37.051 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Dec 05 09:00:37.051 INFO [stderr] 
Dec 05 09:00:37.183 INFO [stderr] warning: function is never used: `read_config`
Dec 05 09:00:37.183 INFO [stderr]   --> src/config.rs:89:1
Dec 05 09:00:37.183 INFO [stderr]    |
Dec 05 09:00:37.183 INFO [stderr] 89 | pub fn read_config() -> Option<Config> {
Dec 05 09:00:37.183 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 09:00:37.183 INFO [stderr]    |
Dec 05 09:00:37.183 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 05 09:00:37.183 INFO [stderr] 
Dec 05 09:00:37.183 INFO [stderr] warning: function is never used: `write_config`
Dec 05 09:00:37.183 INFO [stderr]    --> src/config.rs:123:1
Dec 05 09:00:37.183 INFO [stderr]     |
Dec 05 09:00:37.183 INFO [stderr] 123 | pub fn write_config(config: Config) {
Dec 05 09:00:37.183 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 09:00:37.183 INFO [stderr] 
Dec 05 09:00:37.183 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 09:00:37.183 INFO [stderr]    --> src/config.rs:149:9
Dec 05 09:00:37.183 INFO [stderr]     |
Dec 05 09:00:37.183 INFO [stderr] 149 |         file.write_all(b"");
Dec 05 09:00:37.183 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^
Dec 05 09:00:37.183 INFO [stderr]     |
Dec 05 09:00:37.183 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 05 09:00:37.183 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 09:00:37.183 INFO [stderr] 
Dec 05 09:00:37.183 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 09:00:37.183 INFO [stderr]    --> src/config.rs:171:5
Dec 05 09:00:37.183 INFO [stderr]     |
Dec 05 09:00:37.183 INFO [stderr] 171 |     file.flush();
Dec 05 09:00:37.183 INFO [stderr]     |     ^^^^^^^^^^^^^
Dec 05 09:00:37.183 INFO [stderr]     |
Dec 05 09:00:37.183 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 09:00:37.183 INFO [stderr] 
Dec 05 09:00:37.183 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 09:00:37.183 INFO [stderr]    --> src/config.rs:229:9
Dec 05 09:00:37.183 INFO [stderr]     |
Dec 05 09:00:37.183 INFO [stderr] 229 |         fs::remove_file(test_cache_loc);
Dec 05 09:00:37.183 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 09:00:37.183 INFO [stderr]     |
Dec 05 09:00:37.183 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 09:00:37.183 INFO [stderr] 
Dec 05 09:00:37.188 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 09:00:37.188 INFO [stderr]    --> src/subscription.rs:208:5
Dec 05 09:00:37.188 INFO [stderr]     |
Dec 05 09:00:37.188 INFO [stderr] 208 |     fs::remove_file(test_path);
Dec 05 09:00:37.188 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 09:00:37.188 INFO [stderr]     |
Dec 05 09:00:37.188 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 09:00:37.188 INFO [stderr] 
Dec 05 09:00:37.188 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 09:00:37.188 INFO [stderr]   --> src/util.rs:47:21
Dec 05 09:00:37.188 INFO [stderr]    |
Dec 05 09:00:37.189 INFO [stderr] 47 |                     write!(stdout, "{}", v);
Dec 05 09:00:37.189 INFO [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 09:00:37.189 INFO [stderr]    |
Dec 05 09:00:37.189 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 09:00:37.189 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 05 09:00:37.189 INFO [stderr] 
Dec 05 09:00:37.215 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.39s
Dec 05 09:00:37.227 INFO [stderr] su: No module specific data is present
Dec 05 09:00:37.743 INFO running `"docker" "inspect" "bba6f044d37bcc17897c38a37966eab8a3a7aa48050b6247835564676ba814d6"`
Dec 05 09:00:37.976 INFO running `"docker" "rm" "-f" "bba6f044d37bcc17897c38a37966eab8a3a7aa48050b6247835564676ba814d6"`
Dec 05 09:00:38.111 INFO [stdout] bba6f044d37bcc17897c38a37966eab8a3a7aa48050b6247835564676ba814d6