[INFO] updating cached repository https://github.com/Kloenk/datenbriefd
[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] 6190e47bb05d754875c628852e1deeeafafd3026
[INFO] testing Kloenk/datenbriefd against try#41997647ba6a77908f6ef64401414feb00bccf16 for pr-71274
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKloenk%2Fdatenbriefd" "/workspace/builds/worker-9/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Kloenk/datenbriefd on toolchain 41997647ba6a77908f6ef64401414feb00bccf16
[INFO] running `"/workspace/cargo-home/bin/cargo" "+41997647ba6a77908f6ef64401414feb00bccf16" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/Kloenk/datenbriefd
[INFO] finished tweaking git repo https://github.com/Kloenk/datenbriefd
[INFO] tweaked toml for git repo https://github.com/Kloenk/datenbriefd written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/Kloenk/datenbriefd already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+41997647ba6a77908f6ef64401414feb00bccf16" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+41997647ba6a77908f6ef64401414feb00bccf16" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 5d1fa601cba3bd0a5e82294749880bbbf553fde7b3278d0940ff5abf8dd97ca8
[INFO] running `"docker" "start" "-a" "5d1fa601cba3bd0a5e82294749880bbbf553fde7b3278d0940ff5abf8dd97ca8"`
[INFO] [stderr]    Compiling autocfg v0.1.6
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling ryu v1.0.0
[INFO] [stderr]    Compiling quick-error v1.2.2
[INFO] [stderr]    Compiling regex-syntax v0.6.12
[INFO] [stderr]    Compiling ansi_term v0.11.0
[INFO] [stderr]    Compiling termcolor v1.0.5
[INFO] [stderr]    Compiling vec_map v0.8.1
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]    Compiling itoa v0.4.4
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling atty v0.2.13
[INFO] [stderr]    Compiling toml v0.5.3
[INFO] [stderr]    Compiling humantime v1.3.0
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling serde_json v1.0.40
[INFO] [stderr]    Compiling aho-corasick v0.7.6
[INFO] [stderr]    Compiling chrono v0.4.9
[INFO] [stderr]    Compiling regex v1.3.1
[INFO] [stderr]    Compiling env_logger v0.7.0
[INFO] [stderr]    Compiling datenbriefd v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `OpenOptions`
[INFO] [stderr]   --> src/lib.rs:14:16
[INFO] [stderr]    |
[INFO] [stderr] 14 |     fs::{File, OpenOptions},
[INFO] [stderr]    |                ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant `tls` should have an upper camel case name
[INFO] [stderr]   --> src/lib.rs:76:5
[INFO] [stderr]    |
[INFO] [stderr] 76 |     tls,
[INFO] [stderr]    |     ^^^ help: convert the identifier to upper camel case: `Tls`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant `starttls` should have an upper camel case name
[INFO] [stderr]   --> src/lib.rs:77:5
[INFO] [stderr]    |
[INFO] [stderr] 77 |     starttls,
[INFO] [stderr]    |     ^^^^^^^^ help: convert the identifier to upper camel case (notice the capitalization): `Starttls`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `write_time`
[INFO] [stderr]    --> src/lib.rs:165:5
[INFO] [stderr]     |
[INFO] [stderr] 165 |     fn write_time(&self) -> std::io::Result<()> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `ImapControl` should have a snake case name
[INFO] [stderr]   --> src/lib.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 |     pub ImapControl: ServerConfig,
[INFO] [stderr]    |         ^^^^^^^^^^^ help: convert the identifier to snake case: `imap_control`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `Imap` should have a snake case name
[INFO] [stderr]   --> src/lib.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |     pub Imap: ServerConfig,
[INFO] [stderr]    |         ^^^^ help: convert the identifier to snake case (notice the capitalization): `imap`
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `Smtp` should have a snake case name
[INFO] [stderr]   --> src/lib.rs:22:9
[INFO] [stderr]    |
[INFO] [stderr] 22 |     pub Smtp: ServerConfig,
[INFO] [stderr]    |         ^^^^ help: convert the identifier to snake case (notice the capitalization): `smtp`
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 59.89s
[INFO] running `"docker" "inspect" "5d1fa601cba3bd0a5e82294749880bbbf553fde7b3278d0940ff5abf8dd97ca8"`
[INFO] running `"docker" "rm" "-f" "5d1fa601cba3bd0a5e82294749880bbbf553fde7b3278d0940ff5abf8dd97ca8"`
[INFO] [stdout] 5d1fa601cba3bd0a5e82294749880bbbf553fde7b3278d0940ff5abf8dd97ca8
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+41997647ba6a77908f6ef64401414feb00bccf16" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] eba120f2718ee2a857ecaa3412472c2d7468521c695c8afae3982fe3f61a3179
[INFO] running `"docker" "start" "-a" "eba120f2718ee2a857ecaa3412472c2d7468521c695c8afae3982fe3f61a3179"`
[INFO] [stderr]    Compiling datenbriefd v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `OpenOptions`
[INFO] [stderr]   --> src/lib.rs:14:16
[INFO] [stderr]    |
[INFO] [stderr] 14 |     fs::{File, OpenOptions},
[INFO] [stderr]    |                ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant `tls` should have an upper camel case name
[INFO] [stderr]   --> src/lib.rs:76:5
[INFO] [stderr]    |
[INFO] [stderr] 76 |     tls,
[INFO] [stderr]    |     ^^^ help: convert the identifier to upper camel case: `Tls`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant `starttls` should have an upper camel case name
[INFO] [stderr]   --> src/lib.rs:77:5
[INFO] [stderr]    |
[INFO] [stderr] 77 |     starttls,
[INFO] [stderr]    |     ^^^^^^^^ help: convert the identifier to upper camel case (notice the capitalization): `Starttls`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `write_time`
[INFO] [stderr]    --> src/lib.rs:165:5
[INFO] [stderr]     |
[INFO] [stderr] 165 |     fn write_time(&self) -> std::io::Result<()> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `ImapControl` should have a snake case name
[INFO] [stderr]   --> src/lib.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 |     pub ImapControl: ServerConfig,
[INFO] [stderr]    |         ^^^^^^^^^^^ help: convert the identifier to snake case: `imap_control`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `Imap` should have a snake case name
[INFO] [stderr]   --> src/lib.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |     pub Imap: ServerConfig,
[INFO] [stderr]    |         ^^^^ help: convert the identifier to snake case (notice the capitalization): `imap`
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `Smtp` should have a snake case name
[INFO] [stderr]   --> src/lib.rs:22:9
[INFO] [stderr]    |
[INFO] [stderr] 22 |     pub Smtp: ServerConfig,
[INFO] [stderr]    |         ^^^^ help: convert the identifier to snake case (notice the capitalization): `smtp`
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `OpenOptions`
[INFO] [stderr]   --> src/lib.rs:14:16
[INFO] [stderr]    |
[INFO] [stderr] 14 |     fs::{File, OpenOptions},
[INFO] [stderr]    |                ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant `tls` should have an upper camel case name
[INFO] [stderr]   --> src/lib.rs:76:5
[INFO] [stderr]    |
[INFO] [stderr] 76 |     tls,
[INFO] [stderr]    |     ^^^ help: convert the identifier to upper camel case: `Tls`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant `starttls` should have an upper camel case name
[INFO] [stderr]   --> src/lib.rs:77:5
[INFO] [stderr]    |
[INFO] [stderr] 77 |     starttls,
[INFO] [stderr]    |     ^^^^^^^^ help: convert the identifier to upper camel case (notice the capitalization): `Starttls`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `write_time`
[INFO] [stderr]    --> src/lib.rs:165:5
[INFO] [stderr]     |
[INFO] [stderr] 165 |     fn write_time(&self) -> std::io::Result<()> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `ImapControl` should have a snake case name
[INFO] [stderr]   --> src/lib.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 |     pub ImapControl: ServerConfig,
[INFO] [stderr]    |         ^^^^^^^^^^^ help: convert the identifier to snake case: `imap_control`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `Imap` should have a snake case name
[INFO] [stderr]   --> src/lib.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |     pub Imap: ServerConfig,
[INFO] [stderr]    |         ^^^^ help: convert the identifier to snake case (notice the capitalization): `imap`
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `Smtp` should have a snake case name
[INFO] [stderr]   --> src/lib.rs:22:9
[INFO] [stderr]    |
[INFO] [stderr] 22 |     pub Smtp: ServerConfig,
[INFO] [stderr]    |         ^^^^ help: convert the identifier to snake case (notice the capitalization): `smtp`
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.50s
[INFO] running `"docker" "inspect" "eba120f2718ee2a857ecaa3412472c2d7468521c695c8afae3982fe3f61a3179"`
[INFO] running `"docker" "rm" "-f" "eba120f2718ee2a857ecaa3412472c2d7468521c695c8afae3982fe3f61a3179"`
[INFO] [stdout] eba120f2718ee2a857ecaa3412472c2d7468521c695c8afae3982fe3f61a3179
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+41997647ba6a77908f6ef64401414feb00bccf16" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9dc645bac11de907a118555f84c373cf5be2ab47381049901ce3908136a175ba
[INFO] running `"docker" "start" "-a" "9dc645bac11de907a118555f84c373cf5be2ab47381049901ce3908136a175ba"`
[INFO] [stderr] warning: unused import: `OpenOptions`
[INFO] [stderr]   --> src/lib.rs:14:16
[INFO] [stderr]    |
[INFO] [stderr] 14 |     fs::{File, OpenOptions},
[INFO] [stderr]    |                ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant `tls` should have an upper camel case name
[INFO] [stderr]   --> src/lib.rs:76:5
[INFO] [stderr]    |
[INFO] [stderr] 76 |     tls,
[INFO] [stderr]    |     ^^^ help: convert the identifier to upper camel case: `Tls`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant `starttls` should have an upper camel case name
[INFO] [stderr]   --> src/lib.rs:77:5
[INFO] [stderr]    |
[INFO] [stderr] 77 |     starttls,
[INFO] [stderr]    |     ^^^^^^^^ help: convert the identifier to upper camel case (notice the capitalization): `Starttls`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `write_time`
[INFO] [stderr]    --> src/lib.rs:165:5
[INFO] [stderr]     |
[INFO] [stderr] 165 |     fn write_time(&self) -> std::io::Result<()> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `ImapControl` should have a snake case name
[INFO] [stderr]   --> src/lib.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 |     pub ImapControl: ServerConfig,
[INFO] [stderr]    |         ^^^^^^^^^^^ help: convert the identifier to snake case: `imap_control`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `Imap` should have a snake case name
[INFO] [stderr]   --> src/lib.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |     pub Imap: ServerConfig,
[INFO] [stderr]    |         ^^^^ help: convert the identifier to snake case (notice the capitalization): `imap`
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `Smtp` should have a snake case name
[INFO] [stderr]   --> src/lib.rs:22:9
[INFO] [stderr]    |
[INFO] [stderr] 22 |     pub Smtp: ServerConfig,
[INFO] [stderr]    |         ^^^^ help: convert the identifier to snake case (notice the capitalization): `smtp`
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `OpenOptions`
[INFO] [stderr]   --> src/lib.rs:14:16
[INFO] [stderr]    |
[INFO] [stderr] 14 |     fs::{File, OpenOptions},
[INFO] [stderr]    |                ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant `tls` should have an upper camel case name
[INFO] [stderr]   --> src/lib.rs:76:5
[INFO] [stderr]    |
[INFO] [stderr] 76 |     tls,
[INFO] [stderr]    |     ^^^ help: convert the identifier to upper camel case: `Tls`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant `starttls` should have an upper camel case name
[INFO] [stderr]   --> src/lib.rs:77:5
[INFO] [stderr]    |
[INFO] [stderr] 77 |     starttls,
[INFO] [stderr]    |     ^^^^^^^^ help: convert the identifier to upper camel case (notice the capitalization): `Starttls`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `write_time`
[INFO] [stderr]    --> src/lib.rs:165:5
[INFO] [stderr]     |
[INFO] [stderr] 165 |     fn write_time(&self) -> std::io::Result<()> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `ImapControl` should have a snake case name
[INFO] [stderr]   --> src/lib.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 |     pub ImapControl: ServerConfig,
[INFO] [stderr]    |         ^^^^^^^^^^^ help: convert the identifier to snake case: `imap_control`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `Imap` should have a snake case name
[INFO] [stderr]   --> src/lib.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |     pub Imap: ServerConfig,
[INFO] [stderr]    |         ^^^^ help: convert the identifier to snake case (notice the capitalization): `imap`
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `Smtp` should have a snake case name
[INFO] [stderr]   --> src/lib.rs:22:9
[INFO] [stderr]    |
[INFO] [stderr] 22 |     pub Smtp: ServerConfig,
[INFO] [stderr]    |         ^^^^ help: convert the identifier to snake case (notice the capitalization): `smtp`
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.47s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/datenbriefd-bdd46448132adb2b
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test tests::config_parse_time ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/datenbriefd-eac8b363e220ed80
[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
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests datenbriefd
[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
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "9dc645bac11de907a118555f84c373cf5be2ab47381049901ce3908136a175ba"`
[INFO] running `"docker" "rm" "-f" "9dc645bac11de907a118555f84c373cf5be2ab47381049901ce3908136a175ba"`
[INFO] [stdout] 9dc645bac11de907a118555f84c373cf5be2ab47381049901ce3908136a175ba