[INFO] cloning repository https://github.com/TroyNeubauer/aoc2020 [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/TroyNeubauer/aoc2020" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTroyNeubauer%2Faoc2020", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTroyNeubauer%2Faoc2020'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 6540c0b21b0255d04a14312718953ed31a6da1de [INFO] checking TroyNeubauer/aoc2020 against master#36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923 for pr-81863 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTroyNeubauer%2Faoc2020" "/workspace/builds/worker-6/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/TroyNeubauer/aoc2020 on toolchain 36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/TroyNeubauer/aoc2020 [INFO] finished tweaking git repo https://github.com/TroyNeubauer/aoc2020 [INFO] tweaked toml for git repo https://github.com/TroyNeubauer/aoc2020 written to /workspace/builds/worker-6/source/Cargo.toml [INFO] crate git repo https://github.com/TroyNeubauer/aoc2020 already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:ce6408862c0f4858e6cd2b85b2cf085ff7d0d6323904d0a94b71664a228554ab" "/opt/rustwide/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "metadata" "--no-deps" "--format-version=1", 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] 79509a695e9a9299239f32ecaacc61fb09582bb9d8a4152d13e9f88d5dab2d58 [INFO] running `Command { std: "docker" "start" "-a" "79509a695e9a9299239f32ecaacc61fb09582bb9d8a4152d13e9f88d5dab2d58", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "79509a695e9a9299239f32ecaacc61fb09582bb9d8a4152d13e9f88d5dab2d58", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "79509a695e9a9299239f32ecaacc61fb09582bb9d8a4152d13e9f88d5dab2d58", kill_on_drop: false }` [INFO] [stdout] 79509a695e9a9299239f32ecaacc61fb09582bb9d8a4152d13e9f88d5dab2d58 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:ce6408862c0f4858e6cd2b85b2cf085ff7d0d6323904d0a94b71664a228554ab" "/opt/rustwide/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "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] e50f40c3ec0766219e82ac6f123886cea1d8ae0d5f792553e65d5e62793c9a4c [INFO] running `Command { std: "docker" "start" "-a" "e50f40c3ec0766219e82ac6f123886cea1d8ae0d5f792553e65d5e62793c9a4c", kill_on_drop: false }` [INFO] [stderr] Compiling autocfg v1.0.1 [INFO] [stderr] Compiling memchr v2.3.4 [INFO] [stderr] Compiling radium v0.5.3 [INFO] [stderr] Compiling lexical-core v0.7.4 [INFO] [stderr] Checking arrayvec v0.5.2 [INFO] [stderr] Checking tap v1.0.0 [INFO] [stderr] Checking regex-syntax v0.6.21 [INFO] [stderr] Checking wyz v0.2.0 [INFO] [stderr] Checking funty v1.1.0 [INFO] [stderr] Compiling proc_vector2d v1.0.2 [INFO] [stderr] Checking array2d v0.2.1 [INFO] [stderr] Compiling nom v6.0.1 [INFO] [stderr] Checking thread_local v1.0.1 [INFO] [stderr] Compiling num-traits v0.2.14 [INFO] [stderr] Compiling num-integer v0.1.44 [INFO] [stderr] Checking vector2d v2.2.0 [INFO] [stderr] Checking bitvec v0.19.4 [INFO] [stderr] Checking aho-corasick v0.7.15 [INFO] [stderr] Checking regex v1.4.2 [INFO] [stderr] Checking scan_fmt v0.2.5 [INFO] [stderr] Checking aoc-2020 v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused import: `std::collections::HashMap` [INFO] [stdout] --> src/day13/b.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::collections::HashMap; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unnecessary parentheses around type [INFO] [stdout] --> src/day13/b.rs:17:32 [INFO] [stdout] | [INFO] [stdout] 17 | fn parse(lines: &Vec<&str>) -> (Vec>) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_parens)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::collections::HashMap` [INFO] [stdout] --> src/day9/a.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::collections::HashMap; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::collections::HashMap` [INFO] [stdout] --> src/day12/a.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::collections::HashMap; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::collections::HashMap` [INFO] [stdout] --> src/day18/b.rs:1:5 [INFO] [stdout] | [INFO] [stdout] 1 | use std::collections::HashMap; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::slice` [INFO] [stdout] --> src/day18/b.rs:3:5 [INFO] [stdout] | [INFO] [stdout] 3 | use std::slice; [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::collections::HashSet` [INFO] [stdout] --> src/day7/b.rs:3:5 [INFO] [stdout] | [INFO] [stdout] 3 | use std::collections::HashSet; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::str::Lines` [INFO] [stdout] --> src/day3/b.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::str::Lines; [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `max` [INFO] [stdout] --> src/day13/b.rs:40:9 [INFO] [stdout] | [INFO] [stdout] 40 | let max = ids.iter().filter(|o| o.is_some()).map(|o| o.unwrap()).max().unwrap(); [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_max` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::collections::HashMap` [INFO] [stdout] --> src/day18/a.rs:1:5 [INFO] [stdout] | [INFO] [stdout] 1 | use std::collections::HashMap; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `get_next_departure` [INFO] [stdout] --> src/day13/b.rs:31:4 [INFO] [stdout] | [INFO] [stdout] 31 | fn get_next_departure(timestamp: u32, id: u32) -> u32 { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `lines` [INFO] [stdout] --> src/day7/b.rs:88:9 [INFO] [stdout] | [INFO] [stdout] 88 | let lines: Vec<&str> = input.lines().collect(); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_lines` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: cannot borrow `map` as mutable because it is also borrowed as immutable [INFO] [stdout] --> src/day10/a.rs:66:28 [INFO] [stdout] | [INFO] [stdout] 65 | match map.get(&diff) { [INFO] [stdout] | --- immutable borrow occurs here [INFO] [stdout] 66 | Some(value) => map.insert(diff, value + 1), [INFO] [stdout] | ^^^ ----- immutable borrow later used here [INFO] [stdout] | | [INFO] [stdout] | mutable borrow occurs here [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(mutable_borrow_reservation_conflict)]` on by default [INFO] [stdout] = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future [INFO] [stdout] = note: for more information, see issue #59159 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/day7/b.rs:89:10 [INFO] [stdout] | [INFO] [stdout] 89 | let (mut graph, names) = parse(&input); [INFO] [stdout] | ----^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::collections::HashMap` [INFO] [stdout] --> src/day12/b.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::collections::HashMap; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::collections::HashMap` [INFO] [stdout] --> src/day16/a.rs:1:5 [INFO] [stdout] | [INFO] [stdout] 1 | use std::collections::HashMap; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/day18/b.rs:90:9 [INFO] [stdout] | [INFO] [stdout] 90 | for i in 0..indent { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `last_op` [INFO] [stdout] --> src/day18/b.rs:97:26 [INFO] [stdout] | [INFO] [stdout] 97 | fn get_atom(input: &str, last_op: char, indent: u32) -> (&str, usize) { [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_last_op` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::str::Lines` [INFO] [stdout] --> src/day3/a.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::str::Lines; [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::io::Read` [INFO] [stdout] --> src/day15/b.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::io::Read; [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: couldn't read src/day5/b.rs: No such file or directory (os error 2) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to previous error [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `aoc-2020` [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] warning: unused variable: `comment1` [INFO] [stdout] --> src/day16/a.rs:105:17 [INFO] [stdout] | [INFO] [stdout] 105 | let (input, comment1) = parse_comment(input).unwrap(); [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_comment1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `comment2` [INFO] [stdout] --> src/day16/a.rs:107:21 [INFO] [stdout] | [INFO] [stdout] 107 | let (mut input, comment2) = parse_comment(input).unwrap(); [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_comment2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `next_value` is never read [INFO] [stdout] --> src/day15/b.rs:81:9 [INFO] [stdout] | [INFO] [stdout] 81 | let mut next_value = 0; [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_assignments)]` on by default [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `test2` [INFO] [stdout] --> src/day15/b.rs:48:4 [INFO] [stdout] | [INFO] [stdout] 48 | fn test2() { [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: cannot borrow `map` as mutable because it is also borrowed as immutable [INFO] [stdout] --> src/day10/a.rs:66:28 [INFO] [stdout] | [INFO] [stdout] 65 | match map.get(&diff) { [INFO] [stdout] | --- immutable borrow occurs here [INFO] [stdout] 66 | Some(value) => map.insert(diff, value + 1), [INFO] [stdout] | ^^^ ----- immutable borrow later used here [INFO] [stdout] | | [INFO] [stdout] | mutable borrow occurs here [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(mutable_borrow_reservation_conflict)]` on by default [INFO] [stdout] = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future [INFO] [stdout] = note: for more information, see issue #59159 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::io::Read` [INFO] [stdout] --> src/day15/a.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::io::Read; [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `next_value` is never read [INFO] [stdout] --> src/day15/a.rs:79:9 [INFO] [stdout] | [INFO] [stdout] 79 | let mut next_value = 0; [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_assignments)]` on by default [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `test2` [INFO] [stdout] --> src/day15/a.rs:48:4 [INFO] [stdout] | [INFO] [stdout] 48 | fn test2() { [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/day20/a.rs:476:13 [INFO] [stdout] | [INFO] [stdout] 476 | let mut tile = &tiles[child_index]; [INFO] [stdout] | ----^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0596]: cannot borrow `*tile` as mutable, as it is behind a `&` reference [INFO] [stdout] --> src/day20/a.rs:478:15 [INFO] [stdout] | [INFO] [stdout] 476 | let mut tile = &tiles[child_index]; [INFO] [stdout] | ------------------- help: consider changing this to be a mutable reference: `&mut tiles[child_index]` [INFO] [stdout] 477 | let mut string = String::new(); [INFO] [stdout] 478 | while tile.next().is_some() { [INFO] [stdout] | ^^^^ `tile` is a `&` reference, so the data it refers to cannot be borrowed as mutable [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0502]: cannot borrow `*tiles` as mutable because it is also borrowed as immutable [INFO] [stdout] --> src/day20/a.rs:481:16 [INFO] [stdout] | [INFO] [stdout] 476 | let mut tile = &tiles[child_index]; [INFO] [stdout] | ----- immutable borrow occurs here [INFO] [stdout] 477 | let mut string = String::new(); [INFO] [stdout] 478 | while tile.next().is_some() { [INFO] [stdout] | ---- immutable borrow later used here [INFO] [stdout] ... [INFO] [stdout] 481 | if exe_helper(tiles, positions, next_pos + 1, child_index, tmp_a, tmp_b) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ mutable borrow occurs here [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/day20/a.rs:490:9 [INFO] [stdout] | [INFO] [stdout] 490 | let mut result = 0; [INFO] [stdout] | ----^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to 2 previous errors; 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] Some errors have detailed explanations: E0502, E0596. [INFO] [stdout] [INFO] [stdout] For more information about an error, try `rustc --explain E0502`. [INFO] [stdout] [INFO] [stderr] error: build failed [INFO] running `Command { std: "docker" "inspect" "e50f40c3ec0766219e82ac6f123886cea1d8ae0d5f792553e65d5e62793c9a4c", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "e50f40c3ec0766219e82ac6f123886cea1d8ae0d5f792553e65d5e62793c9a4c", kill_on_drop: false }` [INFO] [stdout] e50f40c3ec0766219e82ac6f123886cea1d8ae0d5f792553e65d5e62793c9a4c