[INFO] cloning repository https://github.com/cecton/imap-copy [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cecton/imap-copy" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcecton%2Fimap-copy", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcecton%2Fimap-copy'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 76d4f03ab7c89eb58d4eb6e34a651013a9bb8cdc [INFO] testing cecton/imap-copy against try#722e1797249a965b6335aebd65d777f917e498f1 for pr-91031 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcecton%2Fimap-copy" "/workspace/builds/worker-82/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-82/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/cecton/imap-copy on toolchain 722e1797249a965b6335aebd65d777f917e498f1 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/cecton/imap-copy [INFO] finished tweaking git repo https://github.com/cecton/imap-copy [INFO] tweaked toml for git repo https://github.com/cecton/imap-copy written to /workspace/builds/worker-82/source/Cargo.toml [INFO] crate git repo https://github.com/cecton/imap-copy already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded block-buffer v0.7.1 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] fc2be1def03eb4433bc7ef3d3126ee0bdfee18367bbbd7e0af5a7ed2c2971f1c [INFO] running `Command { std: "docker" "start" "-a" "fc2be1def03eb4433bc7ef3d3126ee0bdfee18367bbbd7e0af5a7ed2c2971f1c", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "fc2be1def03eb4433bc7ef3d3126ee0bdfee18367bbbd7e0af5a7ed2c2971f1c", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "fc2be1def03eb4433bc7ef3d3126ee0bdfee18367bbbd7e0af5a7ed2c2971f1c", kill_on_drop: false }` [INFO] [stdout] fc2be1def03eb4433bc7ef3d3126ee0bdfee18367bbbd7e0af5a7ed2c2971f1c [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 08123c8b968fe3d1c1712535fe7700cb5f3332d3e6c28f375ea3e97d0d14fb23 [INFO] running `Command { std: "docker" "start" "-a" "08123c8b968fe3d1c1712535fe7700cb5f3332d3e6c28f375ea3e97d0d14fb23", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.45 [INFO] [stderr] Compiling version_check v0.1.5 [INFO] [stderr] Compiling cc v1.0.25 [INFO] [stderr] Compiling pkg-config v0.3.14 [INFO] [stderr] Compiling cfg-if v0.1.6 [INFO] [stderr] Compiling typenum v1.10.0 [INFO] [stderr] Compiling lazy_static v1.2.0 [INFO] [stderr] Compiling byteorder v1.2.7 [INFO] [stderr] Compiling foreign-types-shared v0.1.1 [INFO] [stderr] Compiling openssl v0.10.15 [INFO] [stderr] Compiling regex v1.1.0 [INFO] [stderr] Compiling native-tls v0.2.2 [INFO] [stderr] Compiling byte-tools v0.3.0 [INFO] [stderr] Compiling ucd-util v0.1.3 [INFO] [stderr] Compiling bitflags v1.0.4 [INFO] [stderr] Compiling utf8-ranges v1.0.2 [INFO] [stderr] Compiling bufstream v0.1.4 [INFO] [stderr] Compiling opaque-debug v0.2.1 [INFO] [stderr] Compiling block-padding v0.1.2 [INFO] [stderr] Compiling foreign-types v0.3.2 [INFO] [stderr] Compiling thread_local v0.3.6 [INFO] [stderr] Compiling regex-syntax v0.6.4 [INFO] [stderr] Compiling base64 v0.10.0 [INFO] [stderr] Compiling memchr v2.1.2 [INFO] [stderr] Compiling openssl-sys v0.9.39 [INFO] [stderr] Compiling generic-array v0.12.0 [INFO] [stderr] Compiling aho-corasick v0.6.9 [INFO] [stderr] Compiling nom v4.1.1 [INFO] [stderr] Compiling digest v0.8.0 [INFO] [stderr] Compiling block-buffer v0.7.1 [INFO] [stderr] Compiling md-5 v0.8.0 [INFO] [stderr] Compiling imap-proto v0.7.0 [INFO] [stderr] Compiling imap v0.10.0 [INFO] [stderr] Compiling imap-copy v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `mb` [INFO] [stdout] --> src/main.rs:192:9 [INFO] [stdout] | [INFO] [stdout] 192 | let mb = session.select(mailbox)?; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_mb` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: constant is never used: `PAGE` [INFO] [stdout] --> src/main.rs:13:1 [INFO] [stdout] | [INFO] [stdout] 13 | const PAGE: u32 = 10; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `new` [INFO] [stdout] --> src/main.rs:20:8 [INFO] [stdout] | [INFO] [stdout] 20 | fn new(domain: &str, user: &str, password: &str) -> Result { [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `collect_uids` [INFO] [stdout] --> src/main.rs:50:4 [INFO] [stdout] | [INFO] [stdout] 50 | fn collect_uids(session: &mut ImapSession, mailbox: &str) -> Result> { [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `clear` [INFO] [stdout] --> src/main.rs:57:4 [INFO] [stdout] | [INFO] [stdout] 57 | fn clear(session: &mut ImapSession, mailbox: &str) -> Result<()> { [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `copy_emails` [INFO] [stdout] --> src/main.rs:67:4 [INFO] [stdout] | [INFO] [stdout] 67 | fn copy_emails( [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `delete_duplicates` [INFO] [stdout] --> src/main.rs:113:4 [INFO] [stdout] | [INFO] [stdout] 113 | fn delete_duplicates(session: &mut ImapSession, mailbox: &str) -> Result<()> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `delete_sent` [INFO] [stdout] --> src/main.rs:159:4 [INFO] [stdout] | [INFO] [stdout] 159 | fn delete_sent(session: &mut ImapSession, mailbox: &str) -> Result<()> { [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `search` [INFO] [stdout] --> src/main.rs:191:4 [INFO] [stdout] | [INFO] [stdout] 191 | fn search(session: &mut ImapSession, mailbox: &str, astring: &str) -> Result<()> { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused `Result` that must be used [INFO] [stdout] --> src/main.rs:32:9 [INFO] [stdout] | [INFO] [stdout] 32 | self.session.logout(); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_must_use)]` on by default [INFO] [stdout] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 10 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 1m 20s [INFO] running `Command { std: "docker" "inspect" "08123c8b968fe3d1c1712535fe7700cb5f3332d3e6c28f375ea3e97d0d14fb23", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "08123c8b968fe3d1c1712535fe7700cb5f3332d3e6c28f375ea3e97d0d14fb23", kill_on_drop: false }` [INFO] [stdout] 08123c8b968fe3d1c1712535fe7700cb5f3332d3e6c28f375ea3e97d0d14fb23 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 31940ed993a6a2436a35ad63f4b2e26daa86cbd7b31dd9c1d496b83f4fd7e4e1 [INFO] running `Command { std: "docker" "start" "-a" "31940ed993a6a2436a35ad63f4b2e26daa86cbd7b31dd9c1d496b83f4fd7e4e1", kill_on_drop: false }` [INFO] [stderr] Compiling imap-copy v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `mb` [INFO] [stdout] --> src/main.rs:192:9 [INFO] [stdout] | [INFO] [stdout] 192 | let mb = session.select(mailbox)?; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_mb` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: constant is never used: `PAGE` [INFO] [stdout] --> src/main.rs:13:1 [INFO] [stdout] | [INFO] [stdout] 13 | const PAGE: u32 = 10; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `new` [INFO] [stdout] --> src/main.rs:20:8 [INFO] [stdout] | [INFO] [stdout] 20 | fn new(domain: &str, user: &str, password: &str) -> Result { [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `collect_uids` [INFO] [stdout] --> src/main.rs:50:4 [INFO] [stdout] | [INFO] [stdout] 50 | fn collect_uids(session: &mut ImapSession, mailbox: &str) -> Result> { [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `clear` [INFO] [stdout] --> src/main.rs:57:4 [INFO] [stdout] | [INFO] [stdout] 57 | fn clear(session: &mut ImapSession, mailbox: &str) -> Result<()> { [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `copy_emails` [INFO] [stdout] --> src/main.rs:67:4 [INFO] [stdout] | [INFO] [stdout] 67 | fn copy_emails( [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `delete_duplicates` [INFO] [stdout] --> src/main.rs:113:4 [INFO] [stdout] | [INFO] [stdout] 113 | fn delete_duplicates(session: &mut ImapSession, mailbox: &str) -> Result<()> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `delete_sent` [INFO] [stdout] --> src/main.rs:159:4 [INFO] [stdout] | [INFO] [stdout] 159 | fn delete_sent(session: &mut ImapSession, mailbox: &str) -> Result<()> { [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `search` [INFO] [stdout] --> src/main.rs:191:4 [INFO] [stdout] | [INFO] [stdout] 191 | fn search(session: &mut ImapSession, mailbox: &str, astring: &str) -> Result<()> { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused `Result` that must be used [INFO] [stdout] --> src/main.rs:32:9 [INFO] [stdout] | [INFO] [stdout] 32 | self.session.logout(); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_must_use)]` on by default [INFO] [stdout] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 10 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 18.73s [INFO] running `Command { std: "docker" "inspect" "31940ed993a6a2436a35ad63f4b2e26daa86cbd7b31dd9c1d496b83f4fd7e4e1", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "31940ed993a6a2436a35ad63f4b2e26daa86cbd7b31dd9c1d496b83f4fd7e4e1", kill_on_drop: false }` [INFO] [stdout] 31940ed993a6a2436a35ad63f4b2e26daa86cbd7b31dd9c1d496b83f4fd7e4e1 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] ab13e7aa6915fa709f3d302d2ff19356f844f8307fbd63b6c0af2ce502e3c7e2 [INFO] running `Command { std: "docker" "start" "-a" "ab13e7aa6915fa709f3d302d2ff19356f844f8307fbd63b6c0af2ce502e3c7e2", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] warning: unused variable: `mb` [INFO] [stderr] --> src/main.rs:192:9 [INFO] [stderr] | [INFO] [stderr] 192 | let mb = session.select(mailbox)?; [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_mb` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: constant is never used: `PAGE` [INFO] [stderr] --> src/main.rs:13:1 [INFO] [stderr] | [INFO] [stderr] 13 | const PAGE: u32 = 10; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: associated function is never used: `new` [INFO] [stderr] --> src/main.rs:20:8 [INFO] [stderr] | [INFO] [stderr] 20 | fn new(domain: &str, user: &str, password: &str) -> Result { [INFO] [stderr] | ^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `collect_uids` [INFO] [stderr] --> src/main.rs:50:4 [INFO] [stderr] | [INFO] [stderr] 50 | fn collect_uids(session: &mut ImapSession, mailbox: &str) -> Result> { [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `clear` [INFO] [stderr] --> src/main.rs:57:4 [INFO] [stderr] | [INFO] [stderr] 57 | fn clear(session: &mut ImapSession, mailbox: &str) -> Result<()> { [INFO] [stderr] | ^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `copy_emails` [INFO] [stderr] --> src/main.rs:67:4 [INFO] [stderr] | [INFO] [stderr] 67 | fn copy_emails( [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `delete_duplicates` [INFO] [stderr] --> src/main.rs:113:4 [INFO] [stderr] | [INFO] [stderr] 113 | fn delete_duplicates(session: &mut ImapSession, mailbox: &str) -> Result<()> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `delete_sent` [INFO] [stderr] --> src/main.rs:159:4 [INFO] [stderr] | [INFO] [stderr] 159 | fn delete_sent(session: &mut ImapSession, mailbox: &str) -> Result<()> { [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `search` [INFO] [stderr] --> src/main.rs:191:4 [INFO] [stderr] | [INFO] [stderr] 191 | fn search(session: &mut ImapSession, mailbox: &str, astring: &str) -> Result<()> { [INFO] [stderr] | ^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused `Result` that must be used [INFO] [stderr] --> src/main.rs:32:9 [INFO] [stderr] | [INFO] [stderr] 32 | self.session.logout(); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_must_use)]` on by default [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: `imap-copy` (bin "imap-copy" test) generated 10 warnings [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 13.89s [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/imap_copy-21573929cbc7b582) [INFO] [stdout] [INFO] [stdout] running 0 tests [INFO] [stdout] [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] running `Command { std: "docker" "inspect" "ab13e7aa6915fa709f3d302d2ff19356f844f8307fbd63b6c0af2ce502e3c7e2", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "ab13e7aa6915fa709f3d302d2ff19356f844f8307fbd63b6c0af2ce502e3c7e2", kill_on_drop: false }` [INFO] [stdout] ab13e7aa6915fa709f3d302d2ff19356f844f8307fbd63b6c0af2ce502e3c7e2