Nov 28 20:32:03.331 INFO checking podstats-0.1.2 against master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5 for pr-56074
Nov 28 20:32:03.331 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56074/worker-6/master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/pr-56074/master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5:/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 +0b9f19dff1347e29bf4362ab5a8fab84b43023b5-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"`
Nov 28 20:32:03.764 INFO [stdout] 5826fa3daa0a67eb28394e4a637312251df1c745f871eb9b262aab669925e53c
Nov 28 20:32:03.767 INFO running `"docker" "start" "-a" "5826fa3daa0a67eb28394e4a637312251df1c745f871eb9b262aab669925e53c"`
Nov 28 20:32:05.377 INFO [stderr] usermod: no changes
Nov 28 20:32:05.580 INFO [stderr]     Checking podstats v0.1.2 (/source)
Nov 28 20:32:07.116 INFO [stderr] warning: unused `#[macro_use]` import
Nov 28 20:32:07.116 INFO [stderr]  --> src/lib.rs:3:1
Nov 28 20:32:07.116 INFO [stderr]   |
Nov 28 20:32:07.116 INFO [stderr] 3 | #[macro_use]
Nov 28 20:32:07.116 INFO [stderr]   | ^^^^^^^^^^^^
Nov 28 20:32:07.116 INFO [stderr]   |
Nov 28 20:32:07.116 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Nov 28 20:32:07.116 INFO [stderr] 
Nov 28 20:32:07.116 INFO [stderr] warning: unused import: `std::fs`
Nov 28 20:32:07.116 INFO [stderr]  --> src/subscription.rs:7:5
Nov 28 20:32:07.116 INFO [stderr]   |
Nov 28 20:32:07.116 INFO [stderr] 7 | use std::fs;
Nov 28 20:32:07.116 INFO [stderr]   |     ^^^^^^^
Nov 28 20:32:07.116 INFO [stderr] 
Nov 28 20:32:07.592 INFO [stderr] warning: unused variable: `bytes`
Nov 28 20:32:07.592 INFO [stderr]    --> src/config.rs:166:9
Nov 28 20:32:07.592 INFO [stderr]     |
Nov 28 20:32:07.592 INFO [stderr] 166 |     let bytes = match res {
Nov 28 20:32:07.592 INFO [stderr]     |         ^^^^^ help: consider using `_bytes` instead
Nov 28 20:32:07.592 INFO [stderr]     |
Nov 28 20:32:07.592 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Nov 28 20:32:07.592 INFO [stderr] 
Nov 28 20:32:07.761 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 28 20:32:07.761 INFO [stderr]    --> src/config.rs:149:9
Nov 28 20:32:07.761 INFO [stderr]     |
Nov 28 20:32:07.761 INFO [stderr] 149 |         file.write_all(b"");
Nov 28 20:32:07.761 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^
Nov 28 20:32:07.761 INFO [stderr]     |
Nov 28 20:32:07.761 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Nov 28 20:32:07.761 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 28 20:32:07.761 INFO [stderr] 
Nov 28 20:32:07.761 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 28 20:32:07.761 INFO [stderr]    --> src/config.rs:171:5
Nov 28 20:32:07.761 INFO [stderr]     |
Nov 28 20:32:07.761 INFO [stderr] 171 |     file.flush();
Nov 28 20:32:07.761 INFO [stderr]     |     ^^^^^^^^^^^^^
Nov 28 20:32:07.761 INFO [stderr]     |
Nov 28 20:32:07.761 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 28 20:32:07.761 INFO [stderr] 
Nov 28 20:32:08.560 INFO [stderr] warning: unused `#[macro_use]` import
Nov 28 20:32:08.560 INFO [stderr]  --> src/lib.rs:3:1
Nov 28 20:32:08.560 INFO [stderr]   |
Nov 28 20:32:08.560 INFO [stderr] 3 | #[macro_use]
Nov 28 20:32:08.560 INFO [stderr]   | ^^^^^^^^^^^^
Nov 28 20:32:08.560 INFO [stderr]   |
Nov 28 20:32:08.560 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Nov 28 20:32:08.560 INFO [stderr] 
Nov 28 20:32:09.864 INFO [stderr] warning: unused variable: `bytes`
Nov 28 20:32:09.864 INFO [stderr]    --> src/config.rs:166:9
Nov 28 20:32:09.864 INFO [stderr]     |
Nov 28 20:32:09.865 INFO [stderr] 166 |     let bytes = match res {
Nov 28 20:32:09.865 INFO [stderr]     |         ^^^^^ help: consider using `_bytes` instead
Nov 28 20:32:09.865 INFO [stderr]     |
Nov 28 20:32:09.865 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Nov 28 20:32:09.865 INFO [stderr] 
Nov 28 20:32:10.197 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 28 20:32:10.197 INFO [stderr]    --> src/config.rs:149:9
Nov 28 20:32:10.197 INFO [stderr]     |
Nov 28 20:32:10.197 INFO [stderr] 149 |         file.write_all(b"");
Nov 28 20:32:10.197 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^
Nov 28 20:32:10.197 INFO [stderr]     |
Nov 28 20:32:10.197 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Nov 28 20:32:10.197 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 28 20:32:10.197 INFO [stderr] 
Nov 28 20:32:10.197 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 28 20:32:10.197 INFO [stderr]    --> src/config.rs:171:5
Nov 28 20:32:10.197 INFO [stderr]     |
Nov 28 20:32:10.197 INFO [stderr] 171 |     file.flush();
Nov 28 20:32:10.197 INFO [stderr]     |     ^^^^^^^^^^^^^
Nov 28 20:32:10.204 INFO [stderr]     |
Nov 28 20:32:10.204 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 28 20:32:10.204 INFO [stderr] 
Nov 28 20:32:10.204 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 28 20:32:10.204 INFO [stderr]    --> src/config.rs:229:9
Nov 28 20:32:10.204 INFO [stderr]     |
Nov 28 20:32:10.204 INFO [stderr] 229 |         fs::remove_file(test_cache_loc);
Nov 28 20:32:10.204 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 20:32:10.204 INFO [stderr]     |
Nov 28 20:32:10.204 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 28 20:32:10.204 INFO [stderr] 
Nov 28 20:32:10.208 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 28 20:32:10.208 INFO [stderr]    --> src/subscription.rs:208:5
Nov 28 20:32:10.208 INFO [stderr]     |
Nov 28 20:32:10.208 INFO [stderr] 208 |     fs::remove_file(test_path);
Nov 28 20:32:10.208 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 20:32:10.208 INFO [stderr]     |
Nov 28 20:32:10.208 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 28 20:32:10.208 INFO [stderr] 
Nov 28 20:32:10.534 INFO [stderr] warning: unused `#[macro_use]` import
Nov 28 20:32:10.535 INFO [stderr]  --> src/main.rs:3:1
Nov 28 20:32:10.535 INFO [stderr]   |
Nov 28 20:32:10.535 INFO [stderr] 3 | #[macro_use]
Nov 28 20:32:10.535 INFO [stderr]   | ^^^^^^^^^^^^
Nov 28 20:32:10.535 INFO [stderr]   |
Nov 28 20:32:10.535 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Nov 28 20:32:10.535 INFO [stderr] 
Nov 28 20:32:10.535 INFO [stderr] warning: unused import: `SubCommand`
Nov 28 20:32:10.535 INFO [stderr]  --> src/main.rs:8:22
Nov 28 20:32:10.535 INFO [stderr]   |
Nov 28 20:32:10.535 INFO [stderr] 8 | use clap::{Arg, App, SubCommand};
Nov 28 20:32:10.535 INFO [stderr]   |                      ^^^^^^^^^^
Nov 28 20:32:10.535 INFO [stderr] 
Nov 28 20:32:10.540 INFO [stderr] warning: unused import: `std::fs`
Nov 28 20:32:10.540 INFO [stderr]  --> src/subscription.rs:7:5
Nov 28 20:32:10.540 INFO [stderr]   |
Nov 28 20:32:10.540 INFO [stderr] 7 | use std::fs;
Nov 28 20:32:10.540 INFO [stderr]   |     ^^^^^^^
Nov 28 20:32:10.540 INFO [stderr] 
Nov 28 20:32:11.020 INFO [stderr] warning: unused variable: `bytes`
Nov 28 20:32:11.020 INFO [stderr]    --> src/config.rs:166:9
Nov 28 20:32:11.020 INFO [stderr]     |
Nov 28 20:32:11.020 INFO [stderr] 166 |     let bytes = match res {
Nov 28 20:32:11.020 INFO [stderr]     |         ^^^^^ help: consider using `_bytes` instead
Nov 28 20:32:11.020 INFO [stderr]     |
Nov 28 20:32:11.020 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Nov 28 20:32:11.020 INFO [stderr] 
Nov 28 20:32:11.104 INFO [stderr] warning: unused `#[macro_use]` import
Nov 28 20:32:11.104 INFO [stderr]  --> src/main.rs:3:1
Nov 28 20:32:11.104 INFO [stderr]   |
Nov 28 20:32:11.104 INFO [stderr] 3 | #[macro_use]
Nov 28 20:32:11.104 INFO [stderr]   | ^^^^^^^^^^^^
Nov 28 20:32:11.104 INFO [stderr]   |
Nov 28 20:32:11.104 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Nov 28 20:32:11.104 INFO [stderr] 
Nov 28 20:32:11.104 INFO [stderr] warning: unused import: `SubCommand`
Nov 28 20:32:11.104 INFO [stderr]  --> src/main.rs:8:22
Nov 28 20:32:11.104 INFO [stderr]   |
Nov 28 20:32:11.104 INFO [stderr] 8 | use clap::{Arg, App, SubCommand};
Nov 28 20:32:11.104 INFO [stderr]   |                      ^^^^^^^^^^
Nov 28 20:32:11.104 INFO [stderr] 
Nov 28 20:32:11.212 INFO [stderr] warning: function is never used: `read_config`
Nov 28 20:32:11.212 INFO [stderr]   --> src/config.rs:89:1
Nov 28 20:32:11.212 INFO [stderr]    |
Nov 28 20:32:11.212 INFO [stderr] 89 | pub fn read_config() -> Option<Config> {
Nov 28 20:32:11.212 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 20:32:11.212 INFO [stderr]    |
Nov 28 20:32:11.212 INFO [stderr]    = note: #[warn(dead_code)] on by default
Nov 28 20:32:11.212 INFO [stderr] 
Nov 28 20:32:11.212 INFO [stderr] warning: function is never used: `write_config`
Nov 28 20:32:11.212 INFO [stderr]    --> src/config.rs:123:1
Nov 28 20:32:11.212 INFO [stderr]     |
Nov 28 20:32:11.212 INFO [stderr] 123 | pub fn write_config(config: Config) {
Nov 28 20:32:11.212 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 20:32:11.212 INFO [stderr] 
Nov 28 20:32:11.213 INFO [stderr] warning: method is never used: `new`
Nov 28 20:32:11.213 INFO [stderr]   --> src/subscription.rs:24:5
Nov 28 20:32:11.213 INFO [stderr]    |
Nov 28 20:32:11.213 INFO [stderr] 24 |     pub fn new(url: &str, name: &str, directory: Option<&str>) -> Subscription {
Nov 28 20:32:11.213 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 20:32:11.213 INFO [stderr] 
Nov 28 20:32:11.213 INFO [stderr] warning: function is never used: `vec_serialize`
Nov 28 20:32:11.213 INFO [stderr]   --> src/subscription.rs:54:1
Nov 28 20:32:11.213 INFO [stderr]    |
Nov 28 20:32:11.213 INFO [stderr] 54 | pub fn vec_serialize(subs: &Vec<Subscription>) -> Vec<u8> {
Nov 28 20:32:11.213 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 20:32:11.213 INFO [stderr] 
Nov 28 20:32:11.213 INFO [stderr] warning: function is never used: `serialize`
Nov 28 20:32:11.213 INFO [stderr]   --> src/subscription.rs:63:1
Nov 28 20:32:11.213 INFO [stderr]    |
Nov 28 20:32:11.213 INFO [stderr] 63 | pub fn serialize(sub: &Subscription) -> Vec<u8> {
Nov 28 20:32:11.213 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 20:32:11.213 INFO [stderr] 
Nov 28 20:32:11.213 INFO [stderr] warning: function is never used: `deserialize`
Nov 28 20:32:11.213 INFO [stderr]   --> src/subscription.rs:72:1
Nov 28 20:32:11.213 INFO [stderr]    |
Nov 28 20:32:11.213 INFO [stderr] 72 | pub fn deserialize(sub_vec: &Vec<u8>) -> Option<Subscription> {
Nov 28 20:32:11.213 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 20:32:11.213 INFO [stderr] 
Nov 28 20:32:11.213 INFO [stderr] warning: function is never used: `process_directory`
Nov 28 20:32:11.213 INFO [stderr]    --> src/subscription.rs:116:1
Nov 28 20:32:11.213 INFO [stderr]     |
Nov 28 20:32:11.213 INFO [stderr] 116 | fn process_directory(directory: Option<&str>) -> String {
Nov 28 20:32:11.213 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 20:32:11.213 INFO [stderr] 
Nov 28 20:32:11.220 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 28 20:32:11.220 INFO [stderr]    --> src/config.rs:149:9
Nov 28 20:32:11.220 INFO [stderr]     |
Nov 28 20:32:11.220 INFO [stderr] 149 |         file.write_all(b"");
Nov 28 20:32:11.220 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^
Nov 28 20:32:11.220 INFO [stderr]     |
Nov 28 20:32:11.221 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Nov 28 20:32:11.221 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 28 20:32:11.221 INFO [stderr] 
Nov 28 20:32:11.221 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 28 20:32:11.221 INFO [stderr]    --> src/config.rs:171:5
Nov 28 20:32:11.221 INFO [stderr]     |
Nov 28 20:32:11.221 INFO [stderr] 171 |     file.flush();
Nov 28 20:32:11.221 INFO [stderr]     |     ^^^^^^^^^^^^^
Nov 28 20:32:11.221 INFO [stderr]     |
Nov 28 20:32:11.221 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 28 20:32:11.221 INFO [stderr] 
Nov 28 20:32:11.222 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 28 20:32:11.222 INFO [stderr]   --> src/util.rs:47:21
Nov 28 20:32:11.222 INFO [stderr]    |
Nov 28 20:32:11.222 INFO [stderr] 47 |                     write!(stdout, "{}", v);
Nov 28 20:32:11.222 INFO [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 20:32:11.222 INFO [stderr]    |
Nov 28 20:32:11.222 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Nov 28 20:32:11.222 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)
Nov 28 20:32:11.222 INFO [stderr] 
Nov 28 20:32:11.561 INFO [stderr] warning: unused variable: `bytes`
Nov 28 20:32:11.562 INFO [stderr]    --> src/config.rs:166:9
Nov 28 20:32:11.562 INFO [stderr]     |
Nov 28 20:32:11.562 INFO [stderr] 166 |     let bytes = match res {
Nov 28 20:32:11.563 INFO [stderr]     |         ^^^^^ help: consider using `_bytes` instead
Nov 28 20:32:11.563 INFO [stderr]     |
Nov 28 20:32:11.564 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Nov 28 20:32:11.564 INFO [stderr] 
Nov 28 20:32:11.721 INFO [stderr] warning: function is never used: `read_config`
Nov 28 20:32:11.721 INFO [stderr]   --> src/config.rs:89:1
Nov 28 20:32:11.721 INFO [stderr]    |
Nov 28 20:32:11.722 INFO [stderr] 89 | pub fn read_config() -> Option<Config> {
Nov 28 20:32:11.722 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 20:32:11.722 INFO [stderr]    |
Nov 28 20:32:11.722 INFO [stderr]    = note: #[warn(dead_code)] on by default
Nov 28 20:32:11.723 INFO [stderr] 
Nov 28 20:32:11.723 INFO [stderr] warning: function is never used: `write_config`
Nov 28 20:32:11.723 INFO [stderr]    --> src/config.rs:123:1
Nov 28 20:32:11.723 INFO [stderr]     |
Nov 28 20:32:11.724 INFO [stderr] 123 | pub fn write_config(config: Config) {
Nov 28 20:32:11.724 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 20:32:11.724 INFO [stderr] 
Nov 28 20:32:11.724 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 28 20:32:11.725 INFO [stderr]    --> src/config.rs:149:9
Nov 28 20:32:11.725 INFO [stderr]     |
Nov 28 20:32:11.725 INFO [stderr] 149 |         file.write_all(b"");
Nov 28 20:32:11.726 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^
Nov 28 20:32:11.726 INFO [stderr]     |
Nov 28 20:32:11.726 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Nov 28 20:32:11.727 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 28 20:32:11.727 INFO [stderr] 
Nov 28 20:32:11.727 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 28 20:32:11.727 INFO [stderr]    --> src/config.rs:171:5
Nov 28 20:32:11.727 INFO [stderr]     |
Nov 28 20:32:11.728 INFO [stderr] 171 |     file.flush();
Nov 28 20:32:11.728 INFO [stderr]     |     ^^^^^^^^^^^^^
Nov 28 20:32:11.728 INFO [stderr]     |
Nov 28 20:32:11.728 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 28 20:32:11.729 INFO [stderr] 
Nov 28 20:32:11.729 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 28 20:32:11.729 INFO [stderr]    --> src/config.rs:229:9
Nov 28 20:32:11.730 INFO [stderr]     |
Nov 28 20:32:11.730 INFO [stderr] 229 |         fs::remove_file(test_cache_loc);
Nov 28 20:32:11.730 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 20:32:11.730 INFO [stderr]     |
Nov 28 20:32:11.731 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 28 20:32:11.731 INFO [stderr] 
Nov 28 20:32:11.731 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 28 20:32:11.736 INFO [stderr]    --> src/subscription.rs:208:5
Nov 28 20:32:11.736 INFO [stderr]     |
Nov 28 20:32:11.737 INFO [stderr] 208 |     fs::remove_file(test_path);
Nov 28 20:32:11.737 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 20:32:11.737 INFO [stderr]     |
Nov 28 20:32:11.737 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 28 20:32:11.738 INFO [stderr] 
Nov 28 20:32:11.738 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 28 20:32:11.738 INFO [stderr]   --> src/util.rs:47:21
Nov 28 20:32:11.738 INFO [stderr]    |
Nov 28 20:32:11.739 INFO [stderr] 47 |                     write!(stdout, "{}", v);
Nov 28 20:32:11.739 INFO [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 20:32:11.739 INFO [stderr]    |
Nov 28 20:32:11.740 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Nov 28 20:32:11.740 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)
Nov 28 20:32:11.740 INFO [stderr] 
Nov 28 20:32:11.760 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.35s
Nov 28 20:32:11.777 INFO [stderr] su: No module specific data is present
Nov 28 20:32:12.413 INFO running `"docker" "inspect" "5826fa3daa0a67eb28394e4a637312251df1c745f871eb9b262aab669925e53c"`
Nov 28 20:32:12.789 INFO running `"docker" "rm" "-f" "5826fa3daa0a67eb28394e4a637312251df1c745f871eb9b262aab669925e53c"`
Nov 28 20:32:13.140 INFO [stdout] 5826fa3daa0a67eb28394e4a637312251df1c745f871eb9b262aab669925e53c