[INFO] cloning repository https://github.com/hulthe/aoc_2018 [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hulthe/aoc_2018" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhulthe%2Faoc_2018", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhulthe%2Faoc_2018'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 9c115ce01e7bb956d97725df75e5fd43b351c2c7 [INFO] checking hulthe/aoc_2018 against try#a7a572ce3edd6d476191fbfe92c9c1986e009b34 for pr-87190-3 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhulthe%2Faoc_2018" "/workspace/builds/worker-10/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/hulthe/aoc_2018 on toolchain a7a572ce3edd6d476191fbfe92c9c1986e009b34 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/hulthe/aoc_2018 [INFO] finished tweaking git repo https://github.com/hulthe/aoc_2018 [INFO] tweaked toml for git repo https://github.com/hulthe/aoc_2018 written to /workspace/builds/worker-10/source/Cargo.toml [INFO] crate git repo https://github.com/hulthe/aoc_2018 already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded ron v0.4.0 [INFO] [stderr] Downloaded single v1.0.0 [INFO] [stderr] Downloaded binary-heap-plus v0.1.4 [INFO] [stderr] Downloaded from-pest v0.3.1 [INFO] [stderr] Downloaded pest-ast v0.3.3 [INFO] [stderr] Downloaded pest v2.0.2 [INFO] [stderr] Downloaded console v0.7.1 [INFO] [stderr] Downloaded toml v0.4.9 [INFO] [stderr] Downloaded clicolors-control v0.3.1 [INFO] [stderr] Downloaded indicatif v0.10.2 [INFO] [stderr] Downloaded encoding_rs v0.8.13 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] f47f1e262eaa8a6e27cbf8246ba50c8b0ad1c6e97696d7f09635764411b7b931 [INFO] running `Command { std: "docker" "start" "-a" "f47f1e262eaa8a6e27cbf8246ba50c8b0ad1c6e97696d7f09635764411b7b931", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "f47f1e262eaa8a6e27cbf8246ba50c8b0ad1c6e97696d7f09635764411b7b931", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "f47f1e262eaa8a6e27cbf8246ba50c8b0ad1c6e97696d7f09635764411b7b931", kill_on_drop: false }` [INFO] [stdout] f47f1e262eaa8a6e27cbf8246ba50c8b0ad1c6e97696d7f09635764411b7b931 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] b6938ee84ff595775de968ddba8ec02aa8713ee2df6bad4cd6d7b05ba1606bb1 [INFO] running `Command { std: "docker" "start" "-a" "b6938ee84ff595775de968ddba8ec02aa8713ee2df6bad4cd6d7b05ba1606bb1", kill_on_drop: false }` [INFO] [stderr] Copying to /tmp/fixit [INFO] [stderr] Running `cargo fix --edition` [INFO] [stderr] note: Switching to Edition 2021 will enable the use of the version 2 feature resolver in Cargo. [INFO] [stderr] This may cause some dependencies to be built with fewer features enabled than previously. [INFO] [stderr] More information about the resolver changes may be found at https://doc.rust-lang.org/nightly/edition-guide/rust-2021/default-cargo-resolver.html [INFO] [stderr] When building the following dependencies, the given features will no longer be used: [INFO] [stderr] [INFO] [stderr] phf_shared v0.7.23 (as host dependency): unicase [INFO] [stderr] [INFO] [stderr] Compiling libc v0.2.44 [INFO] [stderr] Checking lazy_static v1.2.0 [INFO] [stderr] Checking rand_core v0.3.0 [INFO] [stderr] Compiling proc-macro2 v0.4.24 [INFO] [stderr] Compiling unicode-xid v0.1.0 [INFO] [stderr] Checking futures v0.1.25 [INFO] [stderr] Checking nodrop v0.1.13 [INFO] [stderr] Compiling cc v1.0.25 [INFO] [stderr] Checking memoffset v0.2.1 [INFO] [stderr] Checking byteorder v1.2.7 [INFO] [stderr] Checking stable_deref_trait v1.1.1 [INFO] [stderr] Checking aoc_base v0.1.0 (/tmp/fixit/aoc_base) [INFO] [stderr] Checking slab v0.4.1 [INFO] [stderr] Checking lazycell v1.2.1 [INFO] [stderr] Compiling rayon-core v1.4.1 [INFO] [stderr] Checking itoa v0.4.3 [INFO] [stderr] Compiling serde v1.0.80 [INFO] [stderr] Compiling rayon v1.0.3 [INFO] [stderr] Compiling num-traits v0.2.6 [INFO] [stderr] Checking either v1.5.0 [INFO] [stderr] Compiling failure_derive v0.1.3 [INFO] [stderr] Compiling cfg-if v0.1.6 [INFO] [stderr] Compiling ucd-trie v0.1.1 [INFO] [stderr] Compiling httparse v1.3.3 [INFO] [stderr] Compiling rustc-demangle v0.1.9 [INFO] [stderr] Checking fnv v1.0.6 [INFO] [stderr] Compiling openssl v0.10.15 [INFO] [stderr] Checking foreign-types-shared v0.1.1 [INFO] [stderr] Compiling ryu v0.2.7 [INFO] [stderr] Compiling regex v1.1.0 [INFO] [stderr] Checking ucd-util v0.1.3 [INFO] [stderr] Checking unicode-normalization v0.1.7 [INFO] [stderr] Checking try-lock v0.2.2 [INFO] [stderr] Compiling native-tls v0.2.2 [INFO] [stderr] Compiling crc32fast v1.1.2 [INFO] [stderr] Compiling num-integer v0.1.39 [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> aoc_base/src/lib.rs:8:46 [INFO] [stdout] | [INFO] [stdout] 8 | fn task_a(input: &str) -> Result>; [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(bare_trait_objects)]` on by default [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> aoc_base/src/lib.rs:9:46 [INFO] [stdout] | [INFO] [stdout] 9 | fn task_b(input: &str) -> Result>; [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Compiling maplit v1.0.1 [INFO] [stderr] Checking indexmap v1.0.2 [INFO] [stderr] Checking string v0.1.2 [INFO] [stderr] Checking unicode-width v0.1.5 [INFO] [stderr] Checking siphasher v0.2.3 [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking openssl-probe v0.1.2 [INFO] [stderr] Checking safemem v0.3.0 [INFO] [stderr] Checking percent-encoding v1.0.1 [INFO] [stderr] Checking utf8-ranges v1.0.2 [INFO] [stderr] Compiling encoding_rs v0.8.13 [INFO] [stderr] Checking adler32 v1.0.3 [INFO] [stderr] Checking dtoa v0.4.3 [INFO] [stderr] Checking strsim v0.7.0 [INFO] [stderr] Checking binary-heap-plus v0.1.4 [INFO] [stderr] Checking hex v0.3.2 [INFO] [stderr] Checking xdg v2.2.0 [INFO] [stderr] Checking log v0.4.6 [INFO] [stderr] Checking crossbeam-utils v0.6.1 [INFO] [stderr] Checking crossbeam-utils v0.2.2 [INFO] [stderr] Compiling unicase v1.4.2 [INFO] [stderr] Compiling memchr v2.1.1 [INFO] [stderr] Compiling unicase v2.2.0 [INFO] [stderr] Checking unreachable v1.0.0 [INFO] [stderr] Checking unicode-bidi v0.3.4 [INFO] [stderr] Checking owning_ref v0.4.0 [INFO] [stderr] Checking thread_local v0.3.6 [INFO] [stderr] Compiling pest v2.0.2 [INFO] [stderr] Checking rand_core v0.2.2 [INFO] [stderr] Checking rand_hc v0.1.0 [INFO] [stderr] Checking rand_isaac v0.1.1 [INFO] [stderr] Checking rand_xorshift v0.1.0 [INFO] [stderr] Checking foreign-types v0.3.2 [INFO] [stderr] Checking arrayvec v0.4.8 [INFO] [stderr] Checking aoc_2018_day12 v0.1.0 (/tmp/fixit/day12) [INFO] [stderr] Checking aoc_2018_day01 v0.1.0 (/tmp/fixit/day01) [INFO] [stderr] Checking aoc_2018_day02 v0.1.0 (/tmp/fixit/day02) [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> day01/src/lib.rs:17:47 [INFO] [stdout] | [INFO] [stdout] 17 | fn task_a(input: &str) -> Result> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(bare_trait_objects)]` on by default [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> day01/src/lib.rs:24:47 [INFO] [stdout] | [INFO] [stdout] 24 | fn task_b(input: &str) -> Result> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking aoc_2018_day09 v0.1.0 (/tmp/fixit/day09) [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> day12/src/lib.rs:92:47 [INFO] [stdout] | [INFO] [stdout] 92 | fn task_a(input: &str) -> Result> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(bare_trait_objects)]` on by default [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> day12/src/lib.rs:96:47 [INFO] [stdout] | [INFO] [stdout] 96 | fn task_b(input: &str) -> Result> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking aoc_2018_day10 v0.1.0 (/tmp/fixit/day10) [INFO] [stderr] Checking aoc_2018_day08 v0.1.0 (/tmp/fixit/day08) [INFO] [stderr] Checking regex-syntax v0.6.4 [INFO] [stderr] Compiling itertools v0.7.11 [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> day09/src/lib.rs:26:59 [INFO] [stdout] | [INFO] [stdout] 26 | fn parse_input(input: &str) -> Result<(usize, usize), Box> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(bare_trait_objects)]` on by default [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> day09/src/lib.rs:59:49 [INFO] [stdout] | [INFO] [stdout] 59 | fn task_a(input: &str) -> Result> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> day09/src/lib.rs:64:49 [INFO] [stdout] | [INFO] [stdout] 64 | fn task_b(input: &str) -> Result> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking textwrap v0.10.0 [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking base64 v0.9.3 [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking smallvec v0.6.7 [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> day02/src/lib.rs:9:48 [INFO] [stdout] | [INFO] [stdout] 9 | fn task_a(inputs: &str) -> Result> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(bare_trait_objects)]` on by default [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> day02/src/lib.rs:41:48 [INFO] [stdout] | [INFO] [stdout] 41 | fn task_b(ids: &str) -> Result> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking lock_api v0.1.5 [INFO] [stdout] error[E0432]: unresolved import `std::option::NoneError` [INFO] [stdout] --> day08/src/tree.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | use std::option::NoneError; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^ no `NoneError` in `option` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> day10/src/lib.rs:123:50 [INFO] [stdout] | [INFO] [stdout] 123 | fn task_a(input: &str) -> Result> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(bare_trait_objects)]` on by default [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> day10/src/lib.rs:128:47 [INFO] [stdout] | [INFO] [stdout] 128 | fn task_b(input: &str) -> Result> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Compiling parking_lot_core v0.3.1 [INFO] [stderr] Compiling rand_pcg v0.1.1 [INFO] [stdout] error[E0283]: type annotations needed [INFO] [stdout] --> day02/src/lib.rs:61:34 [INFO] [stdout] | [INFO] [stdout] 61 | let mut id = String::from(s1.as_ref()); [INFO] [stdout] | ^^^^^^^^^^^^ cannot infer type for reference `&_` [INFO] [stdout] | [INFO] [stdout] = note: cannot satisfy `String: From<&_>` [INFO] [stdout] note: required by `from` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to previous error; 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0283`. [INFO] [stdout] [INFO] [stderr] Compiling rand_chacha v0.1.0 [INFO] [stderr] error: could not compile `aoc_2018_day02` due to 2 previous errors; 2 warnings emitted [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> day08/src/lib.rs:13:49 [INFO] [stdout] | [INFO] [stdout] 13 | fn task_a(input: &str) -> Result> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(bare_trait_objects)]` on by default [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> day08/src/lib.rs:20:49 [INFO] [stdout] | [INFO] [stdout] 20 | fn task_b(input: &str) -> Result> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a method that returns `Result` [INFO] [stdout] --> day08/src/tree.rs:47:45 [INFO] [stdout] | [INFO] [stdout] 43 | / fn rec_parse<'a, 'b, I>(iter: &'a mut I) -> Result [INFO] [stdout] 44 | | where I: Iterator, [INFO] [stdout] 45 | | 'b: 'a, [INFO] [stdout] 46 | | { [INFO] [stdout] 47 | | let child_count: usize = iter.next()?.parse()?; [INFO] [stdout] | | ^ use `.ok_or(...)?` to provide an error compatible with `Result` [INFO] [stdout] ... | [INFO] [stdout] 59 | | }) [INFO] [stdout] 60 | | } [INFO] [stdout] | |_____- this function returns a `Result` [INFO] [stdout] | [INFO] [stdout] = help: the trait `FromResidual>` is not implemented for `Result` [INFO] [stdout] note: required by `from_residual` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a method that returns `Result` [INFO] [stdout] --> day08/src/tree.rs:48:44 [INFO] [stdout] | [INFO] [stdout] 43 | / fn rec_parse<'a, 'b, I>(iter: &'a mut I) -> Result [INFO] [stdout] 44 | | where I: Iterator, [INFO] [stdout] 45 | | 'b: 'a, [INFO] [stdout] 46 | | { [INFO] [stdout] 47 | | let child_count: usize = iter.next()?.parse()?; [INFO] [stdout] 48 | | let meta_count: usize = iter.next()?.parse()?; [INFO] [stdout] | | ^ use `.ok_or(...)?` to provide an error compatible with `Result` [INFO] [stdout] ... | [INFO] [stdout] 59 | | }) [INFO] [stdout] 60 | | } [INFO] [stdout] | |_____- this function returns a `Result` [INFO] [stdout] | [INFO] [stdout] = help: the trait `FromResidual>` is not implemented for `Result` [INFO] [stdout] note: required by `from_residual` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a method that returns `Result` [INFO] [stdout] --> day08/src/tree.rs:54:59 [INFO] [stdout] | [INFO] [stdout] 43 | / fn rec_parse<'a, 'b, I>(iter: &'a mut I) -> Result [INFO] [stdout] 44 | | where I: Iterator, [INFO] [stdout] 45 | | 'b: 'a, [INFO] [stdout] 46 | | { [INFO] [stdout] ... | [INFO] [stdout] 54 | | .collect::>>()??; [INFO] [stdout] | | ^ use `.ok_or(...)?` to provide an error compatible with `Result` [INFO] [stdout] ... | [INFO] [stdout] 59 | | }) [INFO] [stdout] 60 | | } [INFO] [stdout] | |_____- this function returns a `Result` [INFO] [stdout] | [INFO] [stdout] = help: the trait `FromResidual>` is not implemented for `Result` [INFO] [stdout] note: required by `from_residual` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to 4 previous errors; 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] Some errors have detailed explanations: E0277, E0432. [INFO] [stdout] [INFO] [stdout] For more information about an error, try `rustc --explain E0277`. [INFO] [stdout] [INFO] [stderr] error: build failed [INFO] [stderr] error: failed to migrate to next edition [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] process didn't exit successfully: `cargo fix --edition --allow-no-vcs --allow-dirty --frozen --all --all-targets --message-format=json` (exit status: 101) [INFO] running `Command { std: "docker" "inspect" "b6938ee84ff595775de968ddba8ec02aa8713ee2df6bad4cd6d7b05ba1606bb1", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "b6938ee84ff595775de968ddba8ec02aa8713ee2df6bad4cd6d7b05ba1606bb1", kill_on_drop: false }` [INFO] [stdout] b6938ee84ff595775de968ddba8ec02aa8713ee2df6bad4cd6d7b05ba1606bb1