[INFO] cloning repository https://github.com/hsanpaz/abap-tokenizer
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hsanpaz/abap-tokenizer" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhsanpaz%2Fabap-tokenizer", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhsanpaz%2Fabap-tokenizer'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 90bf9af3441003e2f978c225f04c8ec2dc51b5e1
[INFO] testing hsanpaz/abap-tokenizer against master#733b47ea4b1b86216f14ef56e49440c33933f230+rustflags=-Copt-level=3 for pr-138759
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhsanpaz%2Fabap-tokenizer" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/hsanpaz/abap-tokenizer
[INFO] finished tweaking git repo https://github.com/hsanpaz/abap-tokenizer
[INFO] tweaked toml for git repo https://github.com/hsanpaz/abap-tokenizer written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/hsanpaz/abap-tokenizer on toolchain 733b47ea4b1b86216f14ef56e49440c33933f230
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+733b47ea4b1b86216f14ef56e49440c33933f230" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/hsanpaz/abap-tokenizer already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+733b47ea4b1b86216f14ef56e49440c33933f230" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+733b47ea4b1b86216f14ef56e49440c33933f230" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4e7936eb78b7d863d2eec28e119c5ee1a0ee2039c3e4c281d3dde671c20893df
[INFO] running `Command { std: "docker" "start" "-a" "4e7936eb78b7d863d2eec28e119c5ee1a0ee2039c3e4c281d3dde671c20893df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4e7936eb78b7d863d2eec28e119c5ee1a0ee2039c3e4c281d3dde671c20893df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e7936eb78b7d863d2eec28e119c5ee1a0ee2039c3e4c281d3dde671c20893df", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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 -Copt-level=3" "-e" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+733b47ea4b1b86216f14ef56e49440c33933f230" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c7b5d49d55b1715b27f5902d0e788c64adb9bb30f7780688ff6a074a4295052b
[INFO] running `Command { std: "docker" "start" "-a" "c7b5d49d55b1715b27f5902d0e788c64adb9bb30f7780688ff6a074a4295052b", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.204
[INFO] [stderr]    Compiling regex-syntax v0.8.4
[INFO] [stderr]    Compiling thiserror v1.0.62
[INFO] [stderr]    Compiling aho-corasick v1.1.3
[INFO] [stderr]    Compiling indexmap v2.2.6
[INFO] [stderr]    Compiling winnow v0.6.13
[INFO] [stderr]    Compiling log v0.4.22
[INFO] [stderr]    Compiling syn v2.0.70
[INFO] [stderr]    Compiling clap_builder v4.5.9
[INFO] [stderr]    Compiling regex-automata v0.4.7
[INFO] [stderr]    Compiling regex v1.10.5
[INFO] [stderr]    Compiling env_filter v0.1.0
[INFO] [stderr]    Compiling env_logger v0.11.3
[INFO] [stderr]    Compiling serde_derive v1.0.204
[INFO] [stderr]    Compiling thiserror-impl v1.0.62
[INFO] [stderr]    Compiling clap_derive v4.5.8
[INFO] [stderr]    Compiling clap v4.5.9
[INFO] [stderr]    Compiling toml_datetime v0.6.6
[INFO] [stderr]    Compiling serde_spanned v0.6.6
[INFO] [stderr]    Compiling toml_edit v0.22.15
[INFO] [stderr]    Compiling toml v0.8.14
[INFO] [stderr]    Compiling abap-tokenizer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: multiple fields are never read
[INFO] [stdout]    --> src/config/tokenizer_config.rs:114:9
[INFO] [stdout]     |
[INFO] [stdout] 112 | pub struct RawSpecialRule {
[INFO] [stdout]     |            -------------- fields in this struct
[INFO] [stdout] 113 |     /// Name of the special rule.
[INFO] [stdout] 114 |     pub name: String,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 115 |     /// String that marks the start of the special pattern.
[INFO] [stdout] 116 |     pub start: String,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 117 |     /// Optional string that marks the end of the special pattern.
[INFO] [stdout] 118 |     pub end: Option<String>,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 119 |     /// Optional column where the pattern must start to be valid.
[INFO] [stdout] 120 |     pub start_column: Option<usize>,
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout] 121 |     /// Optional minimum length for the pattern to be valid.
[INFO] [stdout] 122 |     pub min_length: Option<usize>,
[INFO] [stdout]     |         ^^^^^^^^^^
[INFO] [stdout] 123 |     /// Optional regex for additional pattern matching.
[INFO] [stdout] 124 |     pub regex: Option<String>,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 125 |     /// Type of token to be created when this rule matches.
[INFO] [stdout] 126 |     pub token_type: String,
[INFO] [stdout]     |         ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `RawSpecialRule` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2m 04s
[INFO] running `Command { std: "docker" "inspect" "c7b5d49d55b1715b27f5902d0e788c64adb9bb30f7780688ff6a074a4295052b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c7b5d49d55b1715b27f5902d0e788c64adb9bb30f7780688ff6a074a4295052b", kill_on_drop: false }`
[INFO] [stdout] c7b5d49d55b1715b27f5902d0e788c64adb9bb30f7780688ff6a074a4295052b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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 -Copt-level=3" "-e" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+733b47ea4b1b86216f14ef56e49440c33933f230" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 61cb53da1e37dea02b2d03ea2d391e0ed4f5b18a04a9e320428d3c328d432036
[INFO] running `Command { std: "docker" "start" "-a" "61cb53da1e37dea02b2d03ea2d391e0ed4f5b18a04a9e320428d3c328d432036", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.204
[INFO] [stderr]    Compiling serde_json v1.0.120
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling either v1.13.0
[INFO] [stderr]    Compiling libc v0.2.155
[INFO] [stderr]    Compiling plotters-backend v0.3.6
[INFO] [stderr]    Compiling half v2.4.1
[INFO] [stderr]    Compiling cast v0.3.0
[INFO] [stderr]    Compiling oorandom v11.1.4
[INFO] [stderr]    Compiling anes v0.1.6
[INFO] [stderr]    Compiling ciborium-ll v0.2.2
[INFO] [stderr]    Compiling itertools v0.10.5
[INFO] [stderr]    Compiling rayon v1.10.0
[INFO] [stderr]    Compiling plotters-svg v0.3.6
[INFO] [stderr]    Compiling plotters v0.3.6
[INFO] [stderr]    Compiling is-terminal v0.4.12
[INFO] [stderr]    Compiling criterion-plot v0.5.0
[INFO] [stderr]    Compiling serde_spanned v0.6.6
[INFO] [stderr]    Compiling toml_datetime v0.6.6
[INFO] [stderr]    Compiling ciborium v0.2.2
[INFO] [stderr]    Compiling toml_edit v0.22.15
[INFO] [stderr]    Compiling tinytemplate v1.2.1
[INFO] [stderr]    Compiling criterion v0.5.1
[INFO] [stderr]    Compiling toml v0.8.14
[INFO] [stderr]    Compiling abap-tokenizer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: multiple fields are never read
[INFO] [stdout]    --> src/config/tokenizer_config.rs:114:9
[INFO] [stdout]     |
[INFO] [stdout] 112 | pub struct RawSpecialRule {
[INFO] [stdout]     |            -------------- fields in this struct
[INFO] [stdout] 113 |     /// Name of the special rule.
[INFO] [stdout] 114 |     pub name: String,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 115 |     /// String that marks the start of the special pattern.
[INFO] [stdout] 116 |     pub start: String,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 117 |     /// Optional string that marks the end of the special pattern.
[INFO] [stdout] 118 |     pub end: Option<String>,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 119 |     /// Optional column where the pattern must start to be valid.
[INFO] [stdout] 120 |     pub start_column: Option<usize>,
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout] 121 |     /// Optional minimum length for the pattern to be valid.
[INFO] [stdout] 122 |     pub min_length: Option<usize>,
[INFO] [stdout]     |         ^^^^^^^^^^
[INFO] [stdout] 123 |     /// Optional regex for additional pattern matching.
[INFO] [stdout] 124 |     pub regex: Option<String>,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 125 |     /// Type of token to be created when this rule matches.
[INFO] [stdout] 126 |     pub token_type: String,
[INFO] [stdout]     |         ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `RawSpecialRule` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple fields are never read
[INFO] [stdout]    --> src/config/tokenizer_config.rs:114:9
[INFO] [stdout]     |
[INFO] [stdout] 112 | pub struct RawSpecialRule {
[INFO] [stdout]     |            -------------- fields in this struct
[INFO] [stdout] 113 |     /// Name of the special rule.
[INFO] [stdout] 114 |     pub name: String,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 115 |     /// String that marks the start of the special pattern.
[INFO] [stdout] 116 |     pub start: String,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 117 |     /// Optional string that marks the end of the special pattern.
[INFO] [stdout] 118 |     pub end: Option<String>,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 119 |     /// Optional column where the pattern must start to be valid.
[INFO] [stdout] 120 |     pub start_column: Option<usize>,
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout] 121 |     /// Optional minimum length for the pattern to be valid.
[INFO] [stdout] 122 |     pub min_length: Option<usize>,
[INFO] [stdout]     |         ^^^^^^^^^^
[INFO] [stdout] 123 |     /// Optional regex for additional pattern matching.
[INFO] [stdout] 124 |     pub regex: Option<String>,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 125 |     /// Type of token to be created when this rule matches.
[INFO] [stdout] 126 |     pub token_type: String,
[INFO] [stdout]     |         ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `RawSpecialRule` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1m 04s
[INFO] running `Command { std: "docker" "inspect" "61cb53da1e37dea02b2d03ea2d391e0ed4f5b18a04a9e320428d3c328d432036", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "61cb53da1e37dea02b2d03ea2d391e0ed4f5b18a04a9e320428d3c328d432036", kill_on_drop: false }`
[INFO] [stdout] 61cb53da1e37dea02b2d03ea2d391e0ed4f5b18a04a9e320428d3c328d432036
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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 -Copt-level=3" "-e" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+733b47ea4b1b86216f14ef56e49440c33933f230" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 10bfef007a6fb307197843b0916845f62026aed66eddf7fd1d58eab938c1814a
[INFO] running `Command { std: "docker" "start" "-a" "10bfef007a6fb307197843b0916845f62026aed66eddf7fd1d58eab938c1814a", kill_on_drop: false }`
[INFO] [stderr] warning: multiple fields are never read
[INFO] [stderr]    --> src/config/tokenizer_config.rs:114:9
[INFO] [stderr]     |
[INFO] [stderr] 112 | pub struct RawSpecialRule {
[INFO] [stderr]     |            -------------- fields in this struct
[INFO] [stderr] 113 |     /// Name of the special rule.
[INFO] [stderr] 114 |     pub name: String,
[INFO] [stderr]     |         ^^^^
[INFO] [stderr] 115 |     /// String that marks the start of the special pattern.
[INFO] [stderr] 116 |     pub start: String,
[INFO] [stderr]     |         ^^^^^
[INFO] [stderr] 117 |     /// Optional string that marks the end of the special pattern.
[INFO] [stderr] 118 |     pub end: Option<String>,
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 119 |     /// Optional column where the pattern must start to be valid.
[INFO] [stderr] 120 |     pub start_column: Option<usize>,
[INFO] [stderr]     |         ^^^^^^^^^^^^
[INFO] [stderr] 121 |     /// Optional minimum length for the pattern to be valid.
[INFO] [stderr] 122 |     pub min_length: Option<usize>,
[INFO] [stderr]     |         ^^^^^^^^^^
[INFO] [stderr] 123 |     /// Optional regex for additional pattern matching.
[INFO] [stderr] 124 |     pub regex: Option<String>,
[INFO] [stderr]     |         ^^^^^
[INFO] [stderr] 125 |     /// Type of token to be created when this rule matches.
[INFO] [stderr] 126 |     pub token_type: String,
[INFO] [stderr]     |         ^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `RawSpecialRule` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `abap-tokenizer` (lib) generated 1 warning
[INFO] [stderr] warning: `abap-tokenizer` (lib test) generated 1 warning (1 duplicate)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.11s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/abap_tokenizer-7f3bf5b1f79cb5bf)
[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] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/abap_tokenizer-e0d0b9e667dcfea4)
[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] [stderr]    Doc-tests abap_tokenizer
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs - (line 20) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - (line 20) stdout ----
[INFO] [stdout] error[E0425]: cannot find value `input` in this scope
[INFO] [stdout]  --> src/lib.rs:26:44
[INFO] [stdout]   |
[INFO] [stdout] 9 | let mut tokenizer = FlexibleTokenizer::new(input, config);
[INFO] [stdout]   |                                            ^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]  --> src/lib.rs:25:53
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_20_0() {
[INFO] [stdout]   |                                      ---------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 8 | let config = load_toml_config("path/to/config.toml")?;
[INFO] [stdout]   |                                                     ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]   |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_20_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]   |                                                                         +++++++++++++++++++++++++++++++++++++++++
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0425.
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - (line 20)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.19s
[INFO] [stdout] 
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] running `Command { std: "docker" "inspect" "10bfef007a6fb307197843b0916845f62026aed66eddf7fd1d58eab938c1814a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "10bfef007a6fb307197843b0916845f62026aed66eddf7fd1d58eab938c1814a", kill_on_drop: false }`
[INFO] [stdout] 10bfef007a6fb307197843b0916845f62026aed66eddf7fd1d58eab938c1814a
