[INFO] cloning repository https://github.com/Natural-selection1/who-cares-test-unwrap
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Natural-selection1/who-cares-test-unwrap" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNatural-selection1%2Fwho-cares-test-unwrap", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNatural-selection1%2Fwho-cares-test-unwrap'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 937f890c7a0742a044ffebf6ba302e1e4cccb490
[INFO] checking Natural-selection1/who-cares-test-unwrap against 8773d2c75a8e90130dcce745a7ec4e66bb9963db+rustflags=-Aunfulfilled-lint-expectations for pr-163637
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNatural-selection1%2Fwho-cares-test-unwrap" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] removed /workspace/builds/worker-1-tc2/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/Natural-selection1/who-cares-test-unwrap
[INFO] finished tweaking git repo https://github.com/Natural-selection1/who-cares-test-unwrap
[INFO] tweaked toml for git repo https://github.com/Natural-selection1/who-cares-test-unwrap written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Natural-selection1/who-cares-test-unwrap on toolchain 8773d2c75a8e90130dcce745a7ec4e66bb9963db
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8773d2c75a8e90130dcce745a7ec4e66bb9963db" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Natural-selection1/who-cares-test-unwrap 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" "+8773d2c75a8e90130dcce745a7ec4e66bb9963db" "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/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:77db811e55d90add9212f6832c23229e3de5f1c1f9905e8cb07319ea15df73ac" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] cefcacd314c4ba73de8bfcc76bd8ecacfde746bef534fcedd245c573fdb66454
[INFO] running `Command { std: "docker" "start" "cefcacd314c4ba73de8bfcc76bd8ecacfde746bef534fcedd245c573fdb66454", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cefcacd314c4ba73de8bfcc76bd8ecacfde746bef534fcedd245c573fdb66454", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "cefcacd314c4ba73de8bfcc76bd8ecacfde746bef534fcedd245c573fdb66454" "/opt/rustwide/cargo-home/bin/cargo" "+8773d2c75a8e90130dcce745a7ec4e66bb9963db" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cefcacd314c4ba73de8bfcc76bd8ecacfde746bef534fcedd245c573fdb66454", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Aunfulfilled-lint-expectations" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-w" "/opt/rustwide/workdir" "--user" "0:0" "cefcacd314c4ba73de8bfcc76bd8ecacfde746bef534fcedd245c573fdb66454" "/opt/rustwide/cargo-home/bin/cargo" "+8773d2c75a8e90130dcce745a7ec4e66bb9963db" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]    Compiling proc-macro2 v1.0.106
[INFO] [stderr]    Compiling serde_json v1.0.150
[INFO] [stderr]     Checking unicode-ident v1.0.24
[INFO] [stderr]    Compiling anyhow v1.0.102
[INFO] [stderr]     Checking memchr v2.8.2
[INFO] [stderr]     Checking who_cares v2.0.0 (/opt/rustwide/workdir/crates/who_cares)
[INFO] [stderr]     Checking quote v1.0.45
[INFO] [stderr]     Checking syn v2.0.118
[INFO] [stderr]     Checking who_cares_macros v0.0.0 (/opt/rustwide/workdir/crates/macro)
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `ops::try_trait_old::FromResidual`)
[INFO] [stdout]   --> crates/who_cares/tests/usage.rs:10:43
[INFO] [stdout]    |
[INFO] [stdout]  6 | fn you_can_use_it_on_both_option_and_result() -> WhoCares<()> {
[INFO] [stdout]    | ------------------------------------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 10 |         reader.read_to_string(&mut config)?;
[INFO] [stdout]    |                                           ^ cannot use the `?` operator in a function that returns `WhoCares<()>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `ops::try_trait_old::FromResidual<Result<!, std::io::Error>>` is not implemented for `WhoCares<()>`
[INFO] [stdout]    = note: `WhoCares<()>` implements similarly named trait `FromResidual`, but not `ops::try_trait_old::FromResidual<Result<!, std::io::Error>>`
[INFO] [stdout] 
[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 `ops::try_trait_old::FromResidual`)
[INFO] [stdout]   --> crates/who_cares/tests/usage.rs:12:6
[INFO] [stdout]    |
[INFO] [stdout]  6 | fn you_can_use_it_on_both_option_and_result() -> WhoCares<()> {
[INFO] [stdout]    | ------------------------------------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 12 |     }?;
[INFO] [stdout]    |      ^ cannot use the `?` operator in a function that returns `WhoCares<()>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `ops::try_trait_old::FromResidual<Result<!, std::io::Error>>` is not implemented for `WhoCares<()>`
[INFO] [stdout]    = note: `WhoCares<()>` implements similarly named trait `FromResidual`, but not `ops::try_trait_old::FromResidual<Result<!, std::io::Error>>`
[INFO] [stdout] 
[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 `ops::try_trait_old::FromResidual`)
[INFO] [stdout]   --> crates/who_cares/tests/usage.rs:13:44
[INFO] [stdout]    |
[INFO] [stdout]  6 | fn you_can_use_it_on_both_option_and_result() -> WhoCares<()> {
[INFO] [stdout]    | ------------------------------------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 13 |     let name = config.strip_prefix("name=")?;
[INFO] [stdout]    |                                            ^ cannot use the `?` operator in a function that returns `WhoCares<()>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `ops::try_trait_old::FromResidual<Option<!>>` is not implemented for `WhoCares<()>`
[INFO] [stdout]    = note: `WhoCares<()>` implements similarly named trait `FromResidual`, but not `ops::try_trait_old::FromResidual<Option<!>>`
[INFO] [stdout] 
[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 `ops::try_trait_old::FromResidual`)
[INFO] [stdout]   --> crates/who_cares/tests/usage.rs:27:6
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn complex_example() -> WhoCares<()> {
[INFO] [stdout]    | ------------------------------------ this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 27 |     )?;
[INFO] [stdout]    |      ^ cannot use the `?` operator in a function that returns `WhoCares<()>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `ops::try_trait_old::FromResidual<Result<!, serde_json::Error>>` is not implemented for `WhoCares<()>`
[INFO] [stdout]    = note: `WhoCares<()>` implements similarly named trait `FromResidual`, but not `ops::try_trait_old::FromResidual<Result<!, serde_json::Error>>`
[INFO] [stdout] 
[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 `ops::try_trait_old::FromResidual`)
[INFO] [stdout]   --> crates/who_cares/tests/usage.rs:29:41
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn complex_example() -> WhoCares<()> {
[INFO] [stdout]    | ------------------------------------ this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 29 |     let crate_name = report.get("crate")?.as_str()?;
[INFO] [stdout]    |                                         ^ cannot use the `?` operator in a function that returns `WhoCares<()>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `ops::try_trait_old::FromResidual<Option<!>>` is not implemented for `WhoCares<()>`
[INFO] [stdout]    = note: `WhoCares<()>` implements similarly named trait `FromResidual`, but not `ops::try_trait_old::FromResidual<Option<!>>`
[INFO] [stdout] 
[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 `ops::try_trait_old::FromResidual`)
[INFO] [stdout]   --> crates/who_cares/tests/usage.rs:29:51
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn complex_example() -> WhoCares<()> {
[INFO] [stdout]    | ------------------------------------ this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 29 |     let crate_name = report.get("crate")?.as_str()?;
[INFO] [stdout]    |                                                   ^ cannot use the `?` operator in a function that returns `WhoCares<()>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `ops::try_trait_old::FromResidual<Option<!>>` is not implemented for `WhoCares<()>`
[INFO] [stdout]    = note: `WhoCares<()>` implements similarly named trait `FromResidual`, but not `ops::try_trait_old::FromResidual<Option<!>>`
[INFO] [stdout] 
[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 `ops::try_trait_old::FromResidual`)
[INFO] [stdout]   --> crates/who_cares/tests/usage.rs:30:44
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn complex_example() -> WhoCares<()> {
[INFO] [stdout]    | ------------------------------------ this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 30 |     let downloads = report.get("downloads")?.as_u64()?;
[INFO] [stdout]    |                                            ^ cannot use the `?` operator in a function that returns `WhoCares<()>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `ops::try_trait_old::FromResidual<Option<!>>` is not implemented for `WhoCares<()>`
[INFO] [stdout]    = note: `WhoCares<()>` implements similarly named trait `FromResidual`, but not `ops::try_trait_old::FromResidual<Option<!>>`
[INFO] [stdout] 
[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 `ops::try_trait_old::FromResidual`)
[INFO] [stdout]   --> crates/who_cares/tests/usage.rs:30:54
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn complex_example() -> WhoCares<()> {
[INFO] [stdout]    | ------------------------------------ this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 30 |     let downloads = report.get("downloads")?.as_u64()?;
[INFO] [stdout]    |                                                      ^ cannot use the `?` operator in a function that returns `WhoCares<()>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `ops::try_trait_old::FromResidual<Option<!>>` is not implemented for `WhoCares<()>`
[INFO] [stdout]    = note: `WhoCares<()>` implements similarly named trait `FromResidual`, but not `ops::try_trait_old::FromResidual<Option<!>>`
[INFO] [stdout] 
[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 `ops::try_trait_old::FromResidual`)
[INFO] [stdout]   --> crates/who_cares/tests/usage.rs:31:47
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn complex_example() -> WhoCares<()> {
[INFO] [stdout]    | ------------------------------------ this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 31 |     let first_keyword = report.get("keywords")?.as_array()?.first()?.as_str()?;
[INFO] [stdout]    |                                               ^ cannot use the `?` operator in a function that returns `WhoCares<()>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `ops::try_trait_old::FromResidual<Option<!>>` is not implemented for `WhoCares<()>`
[INFO] [stdout]    = note: `WhoCares<()>` implements similarly named trait `FromResidual`, but not `ops::try_trait_old::FromResidual<Option<!>>`
[INFO] [stdout] 
[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 `ops::try_trait_old::FromResidual`)
[INFO] [stdout]   --> crates/who_cares/tests/usage.rs:31:59
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn complex_example() -> WhoCares<()> {
[INFO] [stdout]    | ------------------------------------ this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 31 |     let first_keyword = report.get("keywords")?.as_array()?.first()?.as_str()?;
[INFO] [stdout]    |                                                           ^ cannot use the `?` operator in a function that returns `WhoCares<()>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `ops::try_trait_old::FromResidual<Option<!>>` is not implemented for `WhoCares<()>`
[INFO] [stdout]    = note: `WhoCares<()>` implements similarly named trait `FromResidual`, but not `ops::try_trait_old::FromResidual<Option<!>>`
[INFO] [stdout] 
[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 `ops::try_trait_old::FromResidual`)
[INFO] [stdout]   --> crates/who_cares/tests/usage.rs:31:68
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn complex_example() -> WhoCares<()> {
[INFO] [stdout]    | ------------------------------------ this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 31 |     let first_keyword = report.get("keywords")?.as_array()?.first()?.as_str()?;
[INFO] [stdout]    |                                                                    ^ cannot use the `?` operator in a function that returns `WhoCares<()>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `ops::try_trait_old::FromResidual<Option<!>>` is not implemented for `WhoCares<()>`
[INFO] [stdout]    = note: `WhoCares<()>` implements similarly named trait `FromResidual`, but not `ops::try_trait_old::FromResidual<Option<!>>`
[INFO] [stdout] 
[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 `ops::try_trait_old::FromResidual`)
[INFO] [stdout]   --> crates/who_cares/tests/usage.rs:31:78
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn complex_example() -> WhoCares<()> {
[INFO] [stdout]    | ------------------------------------ this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 31 |     let first_keyword = report.get("keywords")?.as_array()?.first()?.as_str()?;
[INFO] [stdout]    |                                                                              ^ cannot use the `?` operator in a function that returns `WhoCares<()>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `ops::try_trait_old::FromResidual<Option<!>>` is not implemented for `WhoCares<()>`
[INFO] [stdout]    = note: `WhoCares<()>` implements similarly named trait `FromResidual`, but not `ops::try_trait_old::FromResidual<Option<!>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[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 `ops::try_trait_old::FromResidual`)
[INFO] [stdout]  --> crates/who_cares/tests/behavior.rs:7:53
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn test_function_can_return_who_cares() -> WhoCares<()> {
[INFO] [stdout]   | ------------------------------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] 7 |     let answer = "answer=42".strip_prefix("answer=")?;
[INFO] [stdout]   |                                                     ^ cannot use the `?` operator in a function that returns `WhoCares<()>`
[INFO] [stdout]   |
[INFO] [stdout]   = help: the trait `ops::try_trait_old::FromResidual<Option<!>>` is not implemented for `WhoCares<()>`
[INFO] [stdout]   = note: `WhoCares<()>` implements similarly named trait `FromResidual`, but not `ops::try_trait_old::FromResidual<Option<!>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `who_cares` (test "usage") due to 12 previous errors
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `ops::try_trait_old::FromResidual`)
[INFO] [stdout]  --> crates/who_cares/tests/behavior.rs:8:37
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn test_function_can_return_who_cares() -> WhoCares<()> {
[INFO] [stdout]   | ------------------------------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] 7 |     let answer = "answer=42".strip_prefix("answer=")?;
[INFO] [stdout] 8 |     let value = answer.parse::<u8>()?;
[INFO] [stdout]   |                                     ^ cannot use the `?` operator in a function that returns `WhoCares<()>`
[INFO] [stdout]   |
[INFO] [stdout]   = help: the trait `ops::try_trait_old::FromResidual<Result<!, ParseIntError>>` is not implemented for `WhoCares<()>`
[INFO] [stdout]   = note: `WhoCares<()>` implements similarly named trait `FromResidual`, but not `ops::try_trait_old::FromResidual<Result<!, ParseIntError>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `ops::try_trait_old::FromResidual`)
[INFO] [stdout]   --> crates/who_cares/tests/behavior.rs:16:53
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn who_cares_module_path_is_available() -> WhoCares<()> {
[INFO] [stdout]    | ------------------------------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] 16 |     let answer = "answer=42".strip_prefix("answer=")?;
[INFO] [stdout]    |                                                     ^ cannot use the `?` operator in a function that returns `WhoCares<()>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `ops::try_trait_old::FromResidual<Option<!>>` is not implemented for `WhoCares<()>`
[INFO] [stdout]    = note: `WhoCares<()>` implements similarly named trait `FromResidual`, but not `ops::try_trait_old::FromResidual<Option<!>>`
[INFO] [stdout] 
[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 `ops::try_trait_old::FromResidual`)
[INFO] [stdout]   --> crates/who_cares/tests/behavior.rs:17:37
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn who_cares_module_path_is_available() -> WhoCares<()> {
[INFO] [stdout]    | ------------------------------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] 16 |     let answer = "answer=42".strip_prefix("answer=")?;
[INFO] [stdout] 17 |     let value = answer.parse::<u8>()?;
[INFO] [stdout]    |                                     ^ cannot use the `?` operator in a function that returns `WhoCares<()>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `ops::try_trait_old::FromResidual<Result<!, ParseIntError>>` is not implemented for `WhoCares<()>`
[INFO] [stdout]    = note: `WhoCares<()>` implements similarly named trait `FromResidual`, but not `ops::try_trait_old::FromResidual<Result<!, ParseIntError>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a closure that returns `Result` or `Option` (or another type that implements `ops::try_trait_old::FromResidual`)
[INFO] [stdout]   --> crates/who_cares/tests/behavior.rs:27:14
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let panic = std::panic::catch_unwind(|| -> WhoCares<()> {
[INFO] [stdout]    |                                          ------------------ this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] 26 |         let value: Result<(), _> = Err("你好");
[INFO] [stdout] 27 |         value?;
[INFO] [stdout]    |              ^ cannot use the `?` operator in a closure that returns `WhoCares<()>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `ops::try_trait_old::FromResidual<Result<!, &str>>` is not implemented for `WhoCares<()>`
[INFO] [stdout]    = note: `WhoCares<()>` implements similarly named trait `FromResidual`, but not `ops::try_trait_old::FromResidual<Result<!, &str>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a closure that returns `Result` or `Option` (or another type that implements `ops::try_trait_old::FromResidual`)
[INFO] [stdout]   --> crates/who_cares/tests/behavior.rs:39:61
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let panic = std::panic::catch_unwind(|| -> WhoCares<()> {
[INFO] [stdout]    |                                          ------------------ this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] 39 |         let _answer = "status=ready".strip_prefix("answer=")?;
[INFO] [stdout]    |                                                             ^ cannot use the `?` operator in a closure that returns `WhoCares<()>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `ops::try_trait_old::FromResidual<Option<!>>` is not implemented for `WhoCares<()>`
[INFO] [stdout]    = note: `WhoCares<()>` implements similarly named trait `FromResidual`, but not `ops::try_trait_old::FromResidual<Option<!>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `who_cares` (test "behavior") due to 6 previous errors
[INFO] running `Command { std: "docker" "inspect" "cefcacd314c4ba73de8bfcc76bd8ecacfde746bef534fcedd245c573fdb66454", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cefcacd314c4ba73de8bfcc76bd8ecacfde746bef534fcedd245c573fdb66454", kill_on_drop: false }`
[INFO] [stdout] cefcacd314c4ba73de8bfcc76bd8ecacfde746bef534fcedd245c573fdb66454
