[INFO] cloning repository https://github.com/Quramy/rust-parser-study
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Quramy/rust-parser-study" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FQuramy%2Frust-parser-study", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FQuramy%2Frust-parser-study'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 090a2f66940613c82cb356554e20e361af31dab0
[INFO] testing Quramy/rust-parser-study/090a2f66940613c82cb356554e20e361af31dab0 against beta-2024-10-19 for beta-1.83-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FQuramy%2Frust-parser-study" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Quramy/rust-parser-study on toolchain beta-2024-10-19
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2024-10-19" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Quramy/rust-parser-study
[INFO] finished tweaking git repo https://github.com/Quramy/rust-parser-study
[INFO] tweaked toml for git repo https://github.com/Quramy/rust-parser-study written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Quramy/rust-parser-study 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" "+beta-2024-10-19" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] testing Quramy/rust-parser-study/090a2f66940613c82cb356554e20e361af31dab0 against beta-2024-10-19 for beta-1.83-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FQuramy%2Frust-parser-study" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Quramy/rust-parser-study on toolchain beta-2024-10-19
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2024-10-19" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Quramy/rust-parser-study
[INFO] finished tweaking git repo https://github.com/Quramy/rust-parser-study
[INFO] tweaked toml for git repo https://github.com/Quramy/rust-parser-study written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Quramy/rust-parser-study 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" "+beta-2024-10-19" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2024-10-19" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 474d9e59ad1c5cc0cef59eb3232dee61169ce47ccd16c8b3e7f6a3aefd2e1c27
[INFO] running `Command { std: "docker" "start" "-a" "474d9e59ad1c5cc0cef59eb3232dee61169ce47ccd16c8b3e7f6a3aefd2e1c27", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "474d9e59ad1c5cc0cef59eb3232dee61169ce47ccd16c8b3e7f6a3aefd2e1c27", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "474d9e59ad1c5cc0cef59eb3232dee61169ce47ccd16c8b3e7f6a3aefd2e1c27", kill_on_drop: false }`
[INFO] [stdout] 474d9e59ad1c5cc0cef59eb3232dee61169ce47ccd16c8b3e7f6a3aefd2e1c27
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2024-10-19" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 25879feac78a7dc9301d5df599e57da13c68a97fb113cc1ba730b8ea8d30a871
[INFO] running `Command { std: "docker" "start" "-a" "25879feac78a7dc9301d5df599e57da13c68a97fb113cc1ba730b8ea8d30a871", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-parser-study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:125:30
[INFO] [stdout]     |
[INFO] [stdout] 125 | fn skip_spaces(input: &[u8], mut pos: usize) -> Result<((), usize), LexError> {
[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: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:129:27
[INFO] [stdout]     |
[INFO] [stdout] 129 | fn lex_plus(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stdout]     |                           ----^^^^^
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:132:28
[INFO] [stdout]     |
[INFO] [stdout] 132 | fn lex_minus(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stdout]     |                            ----^^^^^
[INFO] [stdout]     |                            |
[INFO] [stdout]     |                            help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:135:31
[INFO] [stdout]     |
[INFO] [stdout] 135 | fn lex_asterisk(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stdout]     |                               ----^^^^^
[INFO] [stdout]     |                               |
[INFO] [stdout]     |                               help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:138:28
[INFO] [stdout]     |
[INFO] [stdout] 138 | fn lex_slash(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stdout]     |                            ----^^^^^
[INFO] [stdout]     |                            |
[INFO] [stdout]     |                            help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:141:29
[INFO] [stdout]     |
[INFO] [stdout] 141 | fn lex_lparen(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stdout]     |                             ----^^^^^
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:144:29
[INFO] [stdout]     |
[INFO] [stdout] 144 | fn lex_rparen(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stdout]     |                             ----^^^^^
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Loc` is never constructed
[INFO] [stdout]  --> src/main.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Loc(usize, usize);
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `merge` is never used
[INFO] [stdout]  --> src/main.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | impl Loc {
[INFO] [stdout]   | -------- method in this implementation
[INFO] [stdout] 5 |     fn merge(&mut self, other: &Loc) -> Loc {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Annot` is never constructed
[INFO] [stdout]   --> src/main.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct Annot<T> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/main.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | impl<T> Annot<T> {
[INFO] [stdout]    | ---------------- associated function in this implementation
[INFO] [stdout] 18 |     fn new(value: T, loc: Loc) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `TokenKind` is never used
[INFO] [stdout]   --> src/main.rs:24:6
[INFO] [stdout]    |
[INFO] [stdout] 24 | enum TokenKind {
[INFO] [stdout]    |      ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Token` is never used
[INFO] [stdout]   --> src/main.rs:34:6
[INFO] [stdout]    |
[INFO] [stdout] 34 | type Token = Annot<TokenKind>;
[INFO] [stdout]    |      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated functions are never used
[INFO] [stdout]   --> src/main.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 36 | impl Token {
[INFO] [stdout]    | ---------- associated functions in this implementation
[INFO] [stdout] 37 |     fn number(n: u64, loc: Loc) -> Self {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 40 |     fn plus(loc: Loc) -> Self {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 43 |     fn minus(loc: Loc) -> Self {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 46 |     fn asterisk(loc: Loc) -> Self {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 49 |     fn slash(loc: Loc) -> Self {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 52 |     fn lparen(loc: Loc) -> Self {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 55 |     fn rparen(loc: Loc) -> Self {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `LexErrorKind` is never used
[INFO] [stdout]   --> src/main.rs:61:6
[INFO] [stdout]    |
[INFO] [stdout] 61 | enum LexErrorKind {
[INFO] [stdout]    |      ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `LexError` is never used
[INFO] [stdout]   --> src/main.rs:66:6
[INFO] [stdout]    |
[INFO] [stdout] 66 | type LexError = Annot<LexErrorKind>;
[INFO] [stdout]    |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `invalid_char` and `eof` are never used
[INFO] [stdout]   --> src/main.rs:69:8
[INFO] [stdout]    |
[INFO] [stdout] 68 | impl LexError {
[INFO] [stdout]    | ------------- associated functions in this implementation
[INFO] [stdout] 69 |     fn invalid_char(c: char, loc: Loc) -> Self {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 72 |     fn eof(loc: Loc) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lex` is never used
[INFO] [stdout]   --> src/main.rs:77:4
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn lex(input: &str) -> Result<Vec<Token>, LexError> {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `recognize_many` is never used
[INFO] [stdout]    --> src/main.rs:107:4
[INFO] [stdout]     |
[INFO] [stdout] 107 | fn recognize_many(input: &[u8], mut pos: usize, mut f: impl FnMut(u8) -> bool) -> usize {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `consume_byte` is never used
[INFO] [stdout]    --> src/main.rs:114:4
[INFO] [stdout]     |
[INFO] [stdout] 114 | fn consume_byte(input: &[u8], mut pos: usize, b: u8) -> Result<(u8, usize), LexError> {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `skip_spaces` is never used
[INFO] [stdout]    --> src/main.rs:125:4
[INFO] [stdout]     |
[INFO] [stdout] 125 | fn skip_spaces(input: &[u8], mut pos: usize) -> Result<((), usize), LexError> {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lex_plus` is never used
[INFO] [stdout]    --> src/main.rs:129:4
[INFO] [stdout]     |
[INFO] [stdout] 129 | fn lex_plus(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lex_minus` is never used
[INFO] [stdout]    --> src/main.rs:132:4
[INFO] [stdout]     |
[INFO] [stdout] 132 | fn lex_minus(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lex_asterisk` is never used
[INFO] [stdout]    --> src/main.rs:135:4
[INFO] [stdout]     |
[INFO] [stdout] 135 | fn lex_asterisk(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lex_slash` is never used
[INFO] [stdout]    --> src/main.rs:138:4
[INFO] [stdout]     |
[INFO] [stdout] 138 | fn lex_slash(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lex_lparen` is never used
[INFO] [stdout]    --> src/main.rs:141:4
[INFO] [stdout]     |
[INFO] [stdout] 141 | fn lex_lparen(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lex_rparen` is never used
[INFO] [stdout]    --> src/main.rs:144:4
[INFO] [stdout]     |
[INFO] [stdout] 144 | fn lex_rparen(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lex_number` is never used
[INFO] [stdout]    --> src/main.rs:148:4
[INFO] [stdout]     |
[INFO] [stdout] 148 | fn lex_number(input: &[u8], mut pos: usize) -> Result<(Token, usize), LexError> {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.17s
[INFO] running `Command { std: "docker" "inspect" "25879feac78a7dc9301d5df599e57da13c68a97fb113cc1ba730b8ea8d30a871", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "25879feac78a7dc9301d5df599e57da13c68a97fb113cc1ba730b8ea8d30a871", kill_on_drop: false }`
[INFO] [stdout] 25879feac78a7dc9301d5df599e57da13c68a97fb113cc1ba730b8ea8d30a871
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2024-10-19" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 76a5546a3c367fc78803ce1d5de1403568ad3f3be6836b267246e37396235c6e
[INFO] running `Command { std: "docker" "start" "-a" "76a5546a3c367fc78803ce1d5de1403568ad3f3be6836b267246e37396235c6e", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-parser-study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:125:30
[INFO] [stdout]     |
[INFO] [stdout] 125 | fn skip_spaces(input: &[u8], mut pos: usize) -> Result<((), usize), LexError> {
[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: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:129:27
[INFO] [stdout]     |
[INFO] [stdout] 129 | fn lex_plus(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stdout]     |                           ----^^^^^
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:132:28
[INFO] [stdout]     |
[INFO] [stdout] 132 | fn lex_minus(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stdout]     |                            ----^^^^^
[INFO] [stdout]     |                            |
[INFO] [stdout]     |                            help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:135:31
[INFO] [stdout]     |
[INFO] [stdout] 135 | fn lex_asterisk(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stdout]     |                               ----^^^^^
[INFO] [stdout]     |                               |
[INFO] [stdout]     |                               help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:138:28
[INFO] [stdout]     |
[INFO] [stdout] 138 | fn lex_slash(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stdout]     |                            ----^^^^^
[INFO] [stdout]     |                            |
[INFO] [stdout]     |                            help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:141:29
[INFO] [stdout]     |
[INFO] [stdout] 141 | fn lex_lparen(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stdout]     |                             ----^^^^^
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:144:29
[INFO] [stdout]     |
[INFO] [stdout] 144 | fn lex_rparen(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stdout]     |                             ----^^^^^
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `merge` is never used
[INFO] [stdout]  --> src/main.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | impl Loc {
[INFO] [stdout]   | -------- method in this implementation
[INFO] [stdout] 5 |     fn merge(&mut self, other: &Loc) -> Loc {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.42s
[INFO] running `Command { std: "docker" "inspect" "76a5546a3c367fc78803ce1d5de1403568ad3f3be6836b267246e37396235c6e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "76a5546a3c367fc78803ce1d5de1403568ad3f3be6836b267246e37396235c6e", kill_on_drop: false }`
[INFO] [stdout] 76a5546a3c367fc78803ce1d5de1403568ad3f3be6836b267246e37396235c6e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2024-10-19" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 835f8698bd2ab47eb3c55aff2bda2776cd45ddab046650886feb08659669533c
[INFO] running `Command { std: "docker" "start" "-a" "835f8698bd2ab47eb3c55aff2bda2776cd45ddab046650886feb08659669533c", kill_on_drop: false }`
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:125:30
[INFO] [stderr]     |
[INFO] [stderr] 125 | fn skip_spaces(input: &[u8], mut pos: usize) -> Result<((), usize), LexError> {
[INFO] [stderr]     |                              ----^^^
[INFO] [stderr]     |                              |
[INFO] [stderr]     |                              help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:129:27
[INFO] [stderr]     |
[INFO] [stderr] 129 | fn lex_plus(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stderr]     |                           ----^^^^^
[INFO] [stderr]     |                           |
[INFO] [stderr]     |                           help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:132:28
[INFO] [stderr]     |
[INFO] [stderr] 132 | fn lex_minus(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stderr]     |                            ----^^^^^
[INFO] [stderr]     |                            |
[INFO] [stderr]     |                            help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:135:31
[INFO] [stderr]     |
[INFO] [stderr] 135 | fn lex_asterisk(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stderr]     |                               ----^^^^^
[INFO] [stderr]     |                               |
[INFO] [stderr]     |                               help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:138:28
[INFO] [stderr]     |
[INFO] [stderr] 138 | fn lex_slash(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stderr]     |                            ----^^^^^
[INFO] [stderr]     |                            |
[INFO] [stderr]     |                            help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:141:29
[INFO] [stderr]     |
[INFO] [stderr] 141 | fn lex_lparen(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stderr]     |                             ----^^^^^
[INFO] [stderr]     |                             |
[INFO] [stderr]     |                             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:144:29
[INFO] [stderr]     |
[INFO] [stderr] 144 | fn lex_rparen(input: &[u8], mut start: usize) -> Result<(Token, usize), LexError> {
[INFO] [stderr]     |                             ----^^^^^
[INFO] [stderr]     |                             |
[INFO] [stderr]     |                             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method `merge` is never used
[INFO] [stderr]  --> src/main.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | impl Loc {
[INFO] [stderr]   | -------- method in this implementation
[INFO] [stderr] 5 |     fn merge(&mut self, other: &Loc) -> Loc {
[INFO] [stderr]   |        ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-parser-study` (bin "rust-parser-study" test) generated 8 warnings (run `cargo fix --bin "rust-parser-study" --tests` to apply 7 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/rust_parser_study-3af80c5c81b8ce35)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test_lexer ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "835f8698bd2ab47eb3c55aff2bda2776cd45ddab046650886feb08659669533c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "835f8698bd2ab47eb3c55aff2bda2776cd45ddab046650886feb08659669533c", kill_on_drop: false }`
[INFO] [stdout] 835f8698bd2ab47eb3c55aff2bda2776cd45ddab046650886feb08659669533c