[INFO] cloning repository https://github.com/LukeThoma5/rs-solitaire
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/LukeThoma5/rs-solitaire" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLukeThoma5%2Frs-solitaire", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLukeThoma5%2Frs-solitaire'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b089b156a5e0630527dff210933c51f2f4941f36
[INFO] checking LukeThoma5/rs-solitaire against try#4a23c45c7893f1416456144e3883cc48ea91722e for pr-82322
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLukeThoma5%2Frs-solitaire" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/LukeThoma5/rs-solitaire on toolchain 4a23c45c7893f1416456144e3883cc48ea91722e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/LukeThoma5/rs-solitaire
[INFO] finished tweaking git repo https://github.com/LukeThoma5/rs-solitaire
[INFO] tweaked toml for git repo https://github.com/LukeThoma5/rs-solitaire written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/LukeThoma5/rs-solitaire already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded libc v0.2.41
[INFO] running `Command { std: "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" "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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c790fa662ff3b03a6e0550149408591afb93592fae264300a0f0059dc67a991d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "c790fa662ff3b03a6e0550149408591afb93592fae264300a0f0059dc67a991d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c790fa662ff3b03a6e0550149408591afb93592fae264300a0f0059dc67a991d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c790fa662ff3b03a6e0550149408591afb93592fae264300a0f0059dc67a991d", kill_on_drop: false }`
[INFO] [stdout] c790fa662ff3b03a6e0550149408591afb93592fae264300a0f0059dc67a991d
[INFO] running `Command { std: "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" "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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] b3350499004b45fce76b9408d68569485794338a1af0cac2e21cb29296f38da9
[INFO] running `Command { std: "docker" "start" "-a" "b3350499004b45fce76b9408d68569485794338a1af0cac2e21cb29296f38da9", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.41
[INFO] [stderr]     Checking rand_core v0.2.0
[INFO] [stderr]     Checking rand v0.5.0
[INFO] [stderr]     Checking solataire v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:177:29
[INFO] [stdout]     |
[INFO] [stdout] 150 |  /     fn move_cards(
[INFO] [stdout] 151 |  |         &mut self,
[INFO] [stdout] 152 |  |         col_from_index: usize,
[INFO] [stdout] 153 |  |         card_index: usize,
[INFO] [stdout] ...    |
[INFO] [stdout] 177 |  |             let move_card = move_column
[INFO] [stdout]     |  |_____________________________^
[INFO] [stdout] 178 | ||                 .visible
[INFO] [stdout] 179 | ||                 .iter()
[INFO] [stdout] 180 | ||                 .skip(move_column_len - card_index - 1)
[INFO] [stdout] 181 | ||                 .next()?;
[INFO] [stdout]     | ||________________________^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] ...    |
[INFO] [stdout] 206 |  |         Ok(())
[INFO] [stdout] 207 |  |     }
[INFO] [stdout]     |  |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:264:24
[INFO] [stdout]     |
[INFO] [stdout] 262 | /     fn hand_to_column(&mut self, column: usize) -> Result<(), GameError> {
[INFO] [stdout] 263 | |         {
[INFO] [stdout] 264 | |             let card = self.hand.last()?;
[INFO] [stdout]     | |                        ^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] 265 | |
[INFO] [stdout] ...   |
[INFO] [stdout] 285 | |         Ok(())
[INFO] [stdout] 286 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:266:26
[INFO] [stdout]     |
[INFO] [stdout] 262 | /     fn hand_to_column(&mut self, column: usize) -> Result<(), GameError> {
[INFO] [stdout] 263 | |         {
[INFO] [stdout] 264 | |             let card = self.hand.last()?;
[INFO] [stdout] 265 | |
[INFO] [stdout] 266 | |             let column = self.cols.get(column)?;
[INFO] [stdout]     | |                          ^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 285 | |         Ok(())
[INFO] [stdout] 286 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:276:9
[INFO] [stdout]     |
[INFO] [stdout] 262 |  /     fn hand_to_column(&mut self, column: usize) -> Result<(), GameError> {
[INFO] [stdout] 263 |  |         {
[INFO] [stdout] 264 |  |             let card = self.hand.last()?;
[INFO] [stdout] 265 |  |
[INFO] [stdout] ...    |
[INFO] [stdout] 276 | /|         self.cols
[INFO] [stdout] 277 | ||             .get_mut(column)?
[INFO] [stdout]     | ||_____________________________^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] ...    |
[INFO] [stdout] 285 |  |         Ok(())
[INFO] [stdout] 286 |  |     }
[INFO] [stdout]     |  |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:279:24
[INFO] [stdout]     |
[INFO] [stdout] 262 | /     fn hand_to_column(&mut self, column: usize) -> Result<(), GameError> {
[INFO] [stdout] 263 | |         {
[INFO] [stdout] 264 | |             let card = self.hand.last()?;
[INFO] [stdout] 265 | |
[INFO] [stdout] ...   |
[INFO] [stdout] 279 | |             .push_back(self.hand.pop()?);
[INFO] [stdout]     | |                        ^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 285 | |         Ok(())
[INFO] [stdout] 286 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:331:22
[INFO] [stdout]     |
[INFO] [stdout] 330 | /     fn column_to_bucket(&mut self, column: usize) -> Result<(), GameError> {
[INFO] [stdout] 331 | |         let column = self.cols.get_mut(column)?;
[INFO] [stdout]     | |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] 332 | |         let bucket: &mut Vec<Card>;
[INFO] [stdout] 333 | |         {
[INFO] [stdout] ...   |
[INFO] [stdout] 353 | |         Ok(())
[INFO] [stdout] 354 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:334:29
[INFO] [stdout]     |
[INFO] [stdout] 330 | /     fn column_to_bucket(&mut self, column: usize) -> Result<(), GameError> {
[INFO] [stdout] 331 | |         let column = self.cols.get_mut(column)?;
[INFO] [stdout] 332 | |         let bucket: &mut Vec<Card>;
[INFO] [stdout] 333 | |         {
[INFO] [stdout] 334 | |             let move_card = column.visible.back()?;
[INFO] [stdout]     | |                             ^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 353 | |         Ok(())
[INFO] [stdout] 354 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:351:21
[INFO] [stdout]     |
[INFO] [stdout] 330 | /     fn column_to_bucket(&mut self, column: usize) -> Result<(), GameError> {
[INFO] [stdout] 331 | |         let column = self.cols.get_mut(column)?;
[INFO] [stdout] 332 | |         let bucket: &mut Vec<Card>;
[INFO] [stdout] 333 | |         {
[INFO] [stdout] ...   |
[INFO] [stdout] 351 | |         bucket.push(column.visible.pop_back()?);
[INFO] [stdout]     | |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] 352 | |         column.reveal();
[INFO] [stdout] 353 | |         Ok(())
[INFO] [stdout] 354 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:177:29
[INFO] [stdout]     |
[INFO] [stdout] 150 |  /     fn move_cards(
[INFO] [stdout] 151 |  |         &mut self,
[INFO] [stdout] 152 |  |         col_from_index: usize,
[INFO] [stdout] 153 |  |         card_index: usize,
[INFO] [stdout] ...    |
[INFO] [stdout] 177 |  |             let move_card = move_column
[INFO] [stdout]     |  |_____________________________^
[INFO] [stdout] 178 | ||                 .visible
[INFO] [stdout] 179 | ||                 .iter()
[INFO] [stdout] 180 | ||                 .skip(move_column_len - card_index - 1)
[INFO] [stdout] 181 | ||                 .next()?;
[INFO] [stdout]     | ||________________________^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] ...    |
[INFO] [stdout] 206 |  |         Ok(())
[INFO] [stdout] 207 |  |     }
[INFO] [stdout]     |  |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:361:29
[INFO] [stdout]     |
[INFO] [stdout] 356 | /     fn hand_to_bucket(&mut self) -> Result<(), GameError> {
[INFO] [stdout] 357 | |         
[INFO] [stdout] 358 | |         {
[INFO] [stdout] 359 | |             let bucket: &mut Vec<Card>;
[INFO] [stdout] 360 | |         {
[INFO] [stdout] 361 | |             let move_card = self.hand.last()?;
[INFO] [stdout]     | |                             ^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 381 | |         Ok(())
[INFO] [stdout] 382 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:378:21
[INFO] [stdout]     |
[INFO] [stdout] 356 | /     fn hand_to_bucket(&mut self) -> Result<(), GameError> {
[INFO] [stdout] 357 | |         
[INFO] [stdout] 358 | |         {
[INFO] [stdout] 359 | |             let bucket: &mut Vec<Card>;
[INFO] [stdout] ...   |
[INFO] [stdout] 378 | |         bucket.push(self.hand.pop()?);
[INFO] [stdout]     | |                     ^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 381 | |         Ok(())
[INFO] [stdout] 382 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:385:22
[INFO] [stdout]     |
[INFO] [stdout] 384 | /     fn bucket_to_column(&mut self, column: usize, bucket_suit: CardSuit) -> Result<(), GameError> {
[INFO] [stdout] 385 | |         let column = self.cols.get_mut(column)?;
[INFO] [stdout]     | |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] 386 | |         let bucket: &mut Vec<Card>;
[INFO] [stdout] 387 | |         {
[INFO] [stdout] ...   |
[INFO] [stdout] 403 | |         Ok(())
[INFO] [stdout] 404 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:395:29
[INFO] [stdout]     |
[INFO] [stdout] 384 | /     fn bucket_to_column(&mut self, column: usize, bucket_suit: CardSuit) -> Result<(), GameError> {
[INFO] [stdout] 385 | |         let column = self.cols.get_mut(column)?;
[INFO] [stdout] 386 | |         let bucket: &mut Vec<Card>;
[INFO] [stdout] 387 | |         {
[INFO] [stdout] ...   |
[INFO] [stdout] 395 | |             let move_card = bucket.last()?;
[INFO] [stdout]     | |                             ^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 403 | |         Ok(())
[INFO] [stdout] 404 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:402:34
[INFO] [stdout]     |
[INFO] [stdout] 384 | /     fn bucket_to_column(&mut self, column: usize, bucket_suit: CardSuit) -> Result<(), GameError> {
[INFO] [stdout] 385 | |         let column = self.cols.get_mut(column)?;
[INFO] [stdout] 386 | |         let bucket: &mut Vec<Card>;
[INFO] [stdout] 387 | |         {
[INFO] [stdout] ...   |
[INFO] [stdout] 402 | |         column.visible.push_back(bucket.pop()?);
[INFO] [stdout]     | |                                  ^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] 403 | |         Ok(())
[INFO] [stdout] 404 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:264:24
[INFO] [stdout]     |
[INFO] [stdout] 262 | /     fn hand_to_column(&mut self, column: usize) -> Result<(), GameError> {
[INFO] [stdout] 263 | |         {
[INFO] [stdout] 264 | |             let card = self.hand.last()?;
[INFO] [stdout]     | |                        ^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] 265 | |
[INFO] [stdout] ...   |
[INFO] [stdout] 285 | |         Ok(())
[INFO] [stdout] 286 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:266:26
[INFO] [stdout]     |
[INFO] [stdout] 262 | /     fn hand_to_column(&mut self, column: usize) -> Result<(), GameError> {
[INFO] [stdout] 263 | |         {
[INFO] [stdout] 264 | |             let card = self.hand.last()?;
[INFO] [stdout] 265 | |
[INFO] [stdout] 266 | |             let column = self.cols.get(column)?;
[INFO] [stdout]     | |                          ^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 285 | |         Ok(())
[INFO] [stdout] 286 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[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 `FromResidual`)
[INFO] [stdout]    --> src/main.rs:451:67
[INFO] [stdout]     |
[INFO] [stdout] 414 | / fn make_move(field: &mut Playfield) -> Result<(), GameError> {
[INFO] [stdout] 415 | |     use std::io::stdin;
[INFO] [stdout] 416 | |
[INFO] [stdout] 417 | |     field.print();
[INFO] [stdout] ...   |
[INFO] [stdout] 451 | |         (Some(&"cheat"), Some(&"pop"), ..) => {field.backlog.push(field.hand.pop()?);},
[INFO] [stdout]     | |                                                                   ^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), GameError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 456 | |     Ok(())
[INFO] [stdout] 457 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:276:9
[INFO] [stdout]     |
[INFO] [stdout] 262 |  /     fn hand_to_column(&mut self, column: usize) -> Result<(), GameError> {
[INFO] [stdout] 263 |  |         {
[INFO] [stdout] 264 |  |             let card = self.hand.last()?;
[INFO] [stdout] 265 |  |
[INFO] [stdout] ...    |
[INFO] [stdout] 276 | /|         self.cols
[INFO] [stdout] 277 | ||             .get_mut(column)?
[INFO] [stdout]     | ||_____________________________^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] ...    |
[INFO] [stdout] 285 |  |         Ok(())
[INFO] [stdout] 286 |  |     }
[INFO] [stdout]     |  |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:279:24
[INFO] [stdout]     |
[INFO] [stdout] 262 | /     fn hand_to_column(&mut self, column: usize) -> Result<(), GameError> {
[INFO] [stdout] 263 | |         {
[INFO] [stdout] 264 | |             let card = self.hand.last()?;
[INFO] [stdout] 265 | |
[INFO] [stdout] ...   |
[INFO] [stdout] 279 | |             .push_back(self.hand.pop()?);
[INFO] [stdout]     | |                        ^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 285 | |         Ok(())
[INFO] [stdout] 286 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 14 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `solataire`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:331:22
[INFO] [stdout]     |
[INFO] [stdout] 330 | /     fn column_to_bucket(&mut self, column: usize) -> Result<(), GameError> {
[INFO] [stdout] 331 | |         let column = self.cols.get_mut(column)?;
[INFO] [stdout]     | |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] 332 | |         let bucket: &mut Vec<Card>;
[INFO] [stdout] 333 | |         {
[INFO] [stdout] ...   |
[INFO] [stdout] 353 | |         Ok(())
[INFO] [stdout] 354 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:334:29
[INFO] [stdout]     |
[INFO] [stdout] 330 | /     fn column_to_bucket(&mut self, column: usize) -> Result<(), GameError> {
[INFO] [stdout] 331 | |         let column = self.cols.get_mut(column)?;
[INFO] [stdout] 332 | |         let bucket: &mut Vec<Card>;
[INFO] [stdout] 333 | |         {
[INFO] [stdout] 334 | |             let move_card = column.visible.back()?;
[INFO] [stdout]     | |                             ^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 353 | |         Ok(())
[INFO] [stdout] 354 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:351:21
[INFO] [stdout]     |
[INFO] [stdout] 330 | /     fn column_to_bucket(&mut self, column: usize) -> Result<(), GameError> {
[INFO] [stdout] 331 | |         let column = self.cols.get_mut(column)?;
[INFO] [stdout] 332 | |         let bucket: &mut Vec<Card>;
[INFO] [stdout] 333 | |         {
[INFO] [stdout] ...   |
[INFO] [stdout] 351 | |         bucket.push(column.visible.pop_back()?);
[INFO] [stdout]     | |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] 352 | |         column.reveal();
[INFO] [stdout] 353 | |         Ok(())
[INFO] [stdout] 354 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:361:29
[INFO] [stdout]     |
[INFO] [stdout] 356 | /     fn hand_to_bucket(&mut self) -> Result<(), GameError> {
[INFO] [stdout] 357 | |         
[INFO] [stdout] 358 | |         {
[INFO] [stdout] 359 | |             let bucket: &mut Vec<Card>;
[INFO] [stdout] 360 | |         {
[INFO] [stdout] 361 | |             let move_card = self.hand.last()?;
[INFO] [stdout]     | |                             ^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 381 | |         Ok(())
[INFO] [stdout] 382 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:378:21
[INFO] [stdout]     |
[INFO] [stdout] 356 | /     fn hand_to_bucket(&mut self) -> Result<(), GameError> {
[INFO] [stdout] 357 | |         
[INFO] [stdout] 358 | |         {
[INFO] [stdout] 359 | |             let bucket: &mut Vec<Card>;
[INFO] [stdout] ...   |
[INFO] [stdout] 378 | |         bucket.push(self.hand.pop()?);
[INFO] [stdout]     | |                     ^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 381 | |         Ok(())
[INFO] [stdout] 382 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:385:22
[INFO] [stdout]     |
[INFO] [stdout] 384 | /     fn bucket_to_column(&mut self, column: usize, bucket_suit: CardSuit) -> Result<(), GameError> {
[INFO] [stdout] 385 | |         let column = self.cols.get_mut(column)?;
[INFO] [stdout]     | |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] 386 | |         let bucket: &mut Vec<Card>;
[INFO] [stdout] 387 | |         {
[INFO] [stdout] ...   |
[INFO] [stdout] 403 | |         Ok(())
[INFO] [stdout] 404 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:395:29
[INFO] [stdout]     |
[INFO] [stdout] 384 | /     fn bucket_to_column(&mut self, column: usize, bucket_suit: CardSuit) -> Result<(), GameError> {
[INFO] [stdout] 385 | |         let column = self.cols.get_mut(column)?;
[INFO] [stdout] 386 | |         let bucket: &mut Vec<Card>;
[INFO] [stdout] 387 | |         {
[INFO] [stdout] ...   |
[INFO] [stdout] 395 | |             let move_card = bucket.last()?;
[INFO] [stdout]     | |                             ^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 403 | |         Ok(())
[INFO] [stdout] 404 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/main.rs:402:34
[INFO] [stdout]     |
[INFO] [stdout] 384 | /     fn bucket_to_column(&mut self, column: usize, bucket_suit: CardSuit) -> Result<(), GameError> {
[INFO] [stdout] 385 | |         let column = self.cols.get_mut(column)?;
[INFO] [stdout] 386 | |         let bucket: &mut Vec<Card>;
[INFO] [stdout] 387 | |         {
[INFO] [stdout] ...   |
[INFO] [stdout] 402 | |         column.visible.push_back(bucket.pop()?);
[INFO] [stdout]     | |                                  ^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<(), GameError>`
[INFO] [stdout] 403 | |         Ok(())
[INFO] [stdout] 404 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[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 `FromResidual`)
[INFO] [stdout]    --> src/main.rs:451:67
[INFO] [stdout]     |
[INFO] [stdout] 414 | / fn make_move(field: &mut Playfield) -> Result<(), GameError> {
[INFO] [stdout] 415 | |     use std::io::stdin;
[INFO] [stdout] 416 | |
[INFO] [stdout] 417 | |     field.print();
[INFO] [stdout] ...   |
[INFO] [stdout] 451 | |         (Some(&"cheat"), Some(&"pop"), ..) => {field.backlog.push(field.hand.pop()?);},
[INFO] [stdout]     | |                                                                   ^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), GameError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 456 | |     Ok(())
[INFO] [stdout] 457 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), GameError>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 14 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "b3350499004b45fce76b9408d68569485794338a1af0cac2e21cb29296f38da9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b3350499004b45fce76b9408d68569485794338a1af0cac2e21cb29296f38da9", kill_on_drop: false }`
[INFO] [stdout] b3350499004b45fce76b9408d68569485794338a1af0cac2e21cb29296f38da9