[INFO] cloning repository https://github.com/wormtql/rusty-parser
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wormtql/rusty-parser" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwormtql%2Frusty-parser", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwormtql%2Frusty-parser'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6b89732ee14c9ee5ed1f9eead2e8d7838cd850d0
[INFO] testing wormtql/rusty-parser against beta-2021-08-01 for beta-1.55-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwormtql%2Frusty-parser" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/wormtql/rusty-parser on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/wormtql/rusty-parser
[INFO] finished tweaking git repo https://github.com/wormtql/rusty-parser
[INFO] tweaked toml for git repo https://github.com/wormtql/rusty-parser written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/wormtql/rusty-parser already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "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-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2dbd415352b24c322a88cc370faa2ebdc7f38de1796736710c00545c456166f4
[INFO] running `Command { std: "docker" "start" "-a" "2dbd415352b24c322a88cc370faa2ebdc7f38de1796736710c00545c456166f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2dbd415352b24c322a88cc370faa2ebdc7f38de1796736710c00545c456166f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2dbd415352b24c322a88cc370faa2ebdc7f38de1796736710c00545c456166f4", kill_on_drop: false }`
[INFO] [stdout] 2dbd415352b24c322a88cc370faa2ebdc7f38de1796736710c00545c456166f4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "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" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1f1b792bbf32dc377430e9957620cc03abf96b003a9d42e6263a3f23d9742675
[INFO] running `Command { std: "docker" "start" "-a" "1f1b792bbf32dc377430e9957620cc03abf96b003a9d42e6263a3f23d9742675", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling serde v1.0.106
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling ryu v1.0.3
[INFO] [stderr]    Compiling itoa v0.4.5
[INFO] [stderr]    Compiling ppv-lite86 v0.2.8
[INFO] [stderr]    Compiling encode_unicode v0.3.6
[INFO] [stderr]    Compiling vec_map v0.8.1
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling dirs v1.0.5
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling csv-core v0.1.10
[INFO] [stderr]    Compiling regex-automata v0.1.9
[INFO] [stderr]    Compiling term v0.5.2
[INFO] [stderr]    Compiling bstr v0.2.12
[INFO] [stderr]    Compiling serde_json v1.0.51
[INFO] [stderr]    Compiling csv v1.1.3
[INFO] [stderr]    Compiling prettytable-rs v0.8.0
[INFO] [stderr]    Compiling grammar v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Token`
[INFO] [stdout]  --> src/ll_table/mod.rs:3:33
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::token::{TokenStream, Token};
[INFO] [stdout]   |                                 ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `NonLeafNode`
[INFO] [stdout]  --> src/ll_table/mod.rs:4:36
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::parse_tree::{ParseTree, NonLeafNode};
[INFO] [stdout]   |                                    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Token`
[INFO] [stdout]  --> src/lr_table/mod.rs:3:33
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::token::{TokenStream, Token};
[INFO] [stdout]   |                                 ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Token`
[INFO] [stdout]  --> src/lr_table/lalr_table.rs:2:33
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::token::{TokenStream, Token};
[INFO] [stdout]   |                                 ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::VecDeque`
[INFO] [stdout]  --> src/lr0/lr0_item_set_family.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::collections::VecDeque;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::thread_rng`
[INFO] [stdout]  --> src/lr0/lr0_item_set_family.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use rand::thread_rng;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `VecDeque`
[INFO] [stdout]  --> src/lr1/lr1_item_set_family.rs:7:33
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::collections::{HashMap, VecDeque};
[INFO] [stdout]   |                                 ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::thread_rng`
[INFO] [stdout]   --> src/lr1/lr1_item_set_family.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use rand::thread_rng;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self::lr1_item_set::LR1ItemSet`
[INFO] [stdout]  --> src/lr1/mod.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use self::lr1_item_set::LR1ItemSet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::grammar::letter::Letter`
[INFO] [stdout]  --> src/parse_tree/mod.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::grammar::letter::Letter;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ActionTableItem`, `LRTable`
[INFO] [stdout]  --> src/parse_tree/mod.rs:5:23
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::lr_table::{LRTable, ActionTableItem};
[INFO] [stdout]   |                       ^^^^^^^  ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TokenStream`
[INFO] [stdout]  --> src/parse_tree/mod.rs:6:20
[INFO] [stdout]   |
[INFO] [stdout] 6 | use crate::token::{TokenStream, Token};
[INFO] [stdout]   |                    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::utils`
[INFO] [stdout]  --> src/automaton/dfa.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::utils;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/automaton/dfa.rs:124:9
[INFO] [stdout]     |
[INFO] [stdout] 124 |         'bigloop: loop {
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/automaton/dfa.rs:130:13
[INFO] [stdout]     |
[INFO] [stdout] 130 |             'everysplit: for p in split.iter() {
[INFO] [stdout]     |             ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/automaton/dfa.rs:131:17
[INFO] [stdout]     |
[INFO] [stdout] 131 |                 'everyletter: for letter in self.letters.iter() {
[INFO] [stdout]     |                 ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::utils`
[INFO] [stdout]  --> src/optimization/du.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::utils;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tree_stack`
[INFO] [stdout]   --> src/ll_table/mod.rs:80:17
[INFO] [stdout]    |
[INFO] [stdout] 80 |         let mut tree_stack: Vec<ParseTree> = Vec::new();
[INFO] [stdout]    |                 ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_tree_stack`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/lr1/mod.rs:17:10
[INFO] [stdout]    |
[INFO] [stdout] 17 |     for (i, item_set) in data.item_sets.iter().enumerate() {
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/optimization/dominant.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     for i in 0..lines.len() {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `uses`
[INFO] [stdout]   --> src/optimization/ud.rs:56:27
[INFO] [stdout]    |
[INFO] [stdout] 56 |         for (point, left, uses) in block.iter() {
[INFO] [stdout]    |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_uses`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/grammar/letter.rs:47:13
[INFO] [stdout]    |
[INFO] [stdout] 47 |         let mut temp = match self {
[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/ll_table/mod.rs:80:13
[INFO] [stdout]    |
[INFO] [stdout] 80 |         let mut tree_stack: Vec<ParseTree> = Vec::new();
[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/lr_table/mod.rs:172:13
[INFO] [stdout]     |
[INFO] [stdout] 172 |         let mut letter_stream: Vec<Letter> = token_stream.stream.iter().map(
[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/lr_table/mod.rs:292:13
[INFO] [stdout]     |
[INFO] [stdout] 292 |         let mut letter_stream: Vec<Letter> = token_stream.stream.iter().map(
[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/lr_table/lalr_table.rs:95:13
[INFO] [stdout]    |
[INFO] [stdout] 95 |         let mut letter_stream: Vec<Letter> = token_stream.stream.iter().map(
[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/lr0/lr0_item_set_family.rs:115:17
[INFO] [stdout]     |
[INFO] [stdout] 115 |             let mut shuffle = &mut signs[..];
[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/lr1/lr1_item_set_family.rs:109:17
[INFO] [stdout]     |
[INFO] [stdout] 109 |             let mut shuffle = &mut signs[..];
[INFO] [stdout]     |                 ----^^^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/parse_tree/mod.rs:75:17
[INFO] [stdout]    |
[INFO] [stdout] 75 |                 state.serialize_field("children", &n.children);
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 29 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `grammar::first_follow_set::FirstFollowSet`
[INFO] [stdout]  --> src/bin/parser.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use grammar::first_follow_set::FirstFollowSet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `grammar::lr0::lr0_item_set_family::LR0ItemSetFamily`
[INFO] [stdout]  --> src/bin/parser.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use grammar::lr0::lr0_item_set_family::LR0ItemSetFamily;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `grammar::lr1::lr1_item_set_family::LR1ItemSetFamily`
[INFO] [stdout]  --> src/bin/parser.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use grammar::lr1::lr1_item_set_family::LR1ItemSetFamily;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `lalr1`, `ll1`
[INFO] [stdout]   --> src/bin/parser.rs:11:26
[INFO] [stdout]    |
[INFO] [stdout] 11 | use grammar::{lr0, slr1, ll1, lr1, lalr1};
[INFO] [stdout]    |                          ^^^       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `grammar::parse_tree::ParseTree`
[INFO] [stdout]   --> src/bin/parser.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use grammar::parse_tree::ParseTree;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `grammar::lr_table::LRTable`
[INFO] [stdout]   --> src/bin/exam.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use grammar::lr_table::LRTable;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `grammar::parse_tree::ParseTree`
[INFO] [stdout]   --> src/bin/exam.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use grammar::parse_tree::ParseTree;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fs::File`
[INFO] [stdout]   --> src/bin/exam.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | use std::fs::File;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fs`
[INFO] [stdout]   --> src/bin/exam.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 | use std::fs;
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/bin/parser.rs:173:17
[INFO] [stdout]     |
[INFO] [stdout] 173 |             let mut grammar = Grammar::from_advanced_file(&f).unwrap();
[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 `Result` that must be used
[INFO] [stdout]    --> src/bin/parser.rs:120:9
[INFO] [stdout]     |
[INFO] [stdout] 120 |         file.write_all(serialized.as_bytes());
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/bin/parser.rs:193:9
[INFO] [stdout]     |
[INFO] [stdout] 193 |         outf.write_all(json.as_bytes());
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::prelude`
[INFO] [stdout]   --> src/bin/exam.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | use std::io::prelude::*;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `parse_tree`
[INFO] [stdout]    --> src/bin/exam.rs:360:14
[INFO] [stdout]     |
[INFO] [stdout] 360 |         let (parse_tree, table) = ll_table.analysis_with_process(&token_stream, g.origin.clone());
[INFO] [stdout]     |              ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_parse_tree`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/exam.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     io::stdin().read_line(&mut input);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 19.92s
[INFO] running `Command { std: "docker" "inspect" "1f1b792bbf32dc377430e9957620cc03abf96b003a9d42e6263a3f23d9742675", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f1b792bbf32dc377430e9957620cc03abf96b003a9d42e6263a3f23d9742675", kill_on_drop: false }`
[INFO] [stdout] 1f1b792bbf32dc377430e9957620cc03abf96b003a9d42e6263a3f23d9742675
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "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" "+beta-2021-08-01" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 30af7faa88d3295a59c859bc306ff611a8c9a6adc35350079f1c4814f583801f
[INFO] running `Command { std: "docker" "start" "-a" "30af7faa88d3295a59c859bc306ff611a8c9a6adc35350079f1c4814f583801f", kill_on_drop: false }`
[INFO] [stdout] warning: unused import: `Token`
[INFO] [stdout]  --> src/ll_table/mod.rs:3:33
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::token::{TokenStream, Token};
[INFO] [stdout]   |                                 ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `NonLeafNode`
[INFO] [stdout]  --> src/ll_table/mod.rs:4:36
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::parse_tree::{ParseTree, NonLeafNode};
[INFO] [stdout]   |                                    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Token`
[INFO] [stdout]  --> src/lr_table/mod.rs:3:33
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::token::{TokenStream, Token};
[INFO] [stdout]   |                                 ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Token`
[INFO] [stdout]  --> src/lr_table/lalr_table.rs:2:33
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::token::{TokenStream, Token};
[INFO] [stdout]   |                                 ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::VecDeque`
[INFO] [stdout]  --> src/lr0/lr0_item_set_family.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::collections::VecDeque;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::thread_rng`
[INFO] [stdout]  --> src/lr0/lr0_item_set_family.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use rand::thread_rng;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `VecDeque`
[INFO] [stdout]  --> src/lr1/lr1_item_set_family.rs:7:33
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::collections::{HashMap, VecDeque};
[INFO] [stdout]   |                                 ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::thread_rng`
[INFO] [stdout]   --> src/lr1/lr1_item_set_family.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use rand::thread_rng;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self::lr1_item_set::LR1ItemSet`
[INFO] [stdout]  --> src/lr1/mod.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use self::lr1_item_set::LR1ItemSet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::grammar::letter::Letter`
[INFO] [stdout]  --> src/parse_tree/mod.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::grammar::letter::Letter;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ActionTableItem`, `LRTable`
[INFO] [stdout]  --> src/parse_tree/mod.rs:5:23
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::lr_table::{LRTable, ActionTableItem};
[INFO] [stdout]   |                       ^^^^^^^  ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TokenStream`
[INFO] [stdout]  --> src/parse_tree/mod.rs:6:20
[INFO] [stdout]   |
[INFO] [stdout] 6 | use crate::token::{TokenStream, Token};
[INFO] [stdout]   |                    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::utils`
[INFO] [stdout]  --> src/automaton/dfa.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::utils;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/automaton/dfa.rs:124:9
[INFO] [stdout]     |
[INFO] [stdout] 124 |         'bigloop: loop {
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/automaton/dfa.rs:130:13
[INFO] [stdout]     |
[INFO] [stdout] 130 |             'everysplit: for p in split.iter() {
[INFO] [stdout]     |             ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/automaton/dfa.rs:131:17
[INFO] [stdout]     |
[INFO] [stdout] 131 |                 'everyletter: for letter in self.letters.iter() {
[INFO] [stdout]     |                 ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling grammar v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `crate::utils`
[INFO] [stdout]  --> src/optimization/du.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::utils;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tree_stack`
[INFO] [stdout]   --> src/ll_table/mod.rs:80:17
[INFO] [stdout]    |
[INFO] [stdout] 80 |         let mut tree_stack: Vec<ParseTree> = Vec::new();
[INFO] [stdout]    |                 ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_tree_stack`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/lr1/mod.rs:17:10
[INFO] [stdout]    |
[INFO] [stdout] 17 |     for (i, item_set) in data.item_sets.iter().enumerate() {
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/optimization/dominant.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     for i in 0..lines.len() {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `uses`
[INFO] [stdout]   --> src/optimization/ud.rs:56:27
[INFO] [stdout]    |
[INFO] [stdout] 56 |         for (point, left, uses) in block.iter() {
[INFO] [stdout]    |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_uses`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/grammar/letter.rs:47:13
[INFO] [stdout]    |
[INFO] [stdout] 47 |         let mut temp = match self {
[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/ll_table/mod.rs:80:13
[INFO] [stdout]    |
[INFO] [stdout] 80 |         let mut tree_stack: Vec<ParseTree> = Vec::new();
[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/lr_table/mod.rs:172:13
[INFO] [stdout]     |
[INFO] [stdout] 172 |         let mut letter_stream: Vec<Letter> = token_stream.stream.iter().map(
[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/lr_table/mod.rs:292:13
[INFO] [stdout]     |
[INFO] [stdout] 292 |         let mut letter_stream: Vec<Letter> = token_stream.stream.iter().map(
[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/lr_table/lalr_table.rs:95:13
[INFO] [stdout]    |
[INFO] [stdout] 95 |         let mut letter_stream: Vec<Letter> = token_stream.stream.iter().map(
[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/lr0/lr0_item_set_family.rs:115:17
[INFO] [stdout]     |
[INFO] [stdout] 115 |             let mut shuffle = &mut signs[..];
[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/lr1/lr1_item_set_family.rs:109:17
[INFO] [stdout]     |
[INFO] [stdout] 109 |             let mut shuffle = &mut signs[..];
[INFO] [stdout]     |                 ----^^^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/parse_tree/mod.rs:75:17
[INFO] [stdout]    |
[INFO] [stdout] 75 |                 state.serialize_field("children", &n.children);
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 29 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `grammar::lr_table::LRTable`
[INFO] [stdout]   --> src/bin/exam.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use grammar::lr_table::LRTable;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `grammar::parse_tree::ParseTree`
[INFO] [stdout]   --> src/bin/exam.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use grammar::parse_tree::ParseTree;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fs::File`
[INFO] [stdout]   --> src/bin/exam.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | use std::fs::File;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fs`
[INFO] [stdout]   --> src/bin/exam.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 | use std::fs;
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `grammar::first_follow_set::FirstFollowSet`
[INFO] [stdout]  --> src/bin/parser.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use grammar::first_follow_set::FirstFollowSet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `grammar::lr0::lr0_item_set_family::LR0ItemSetFamily`
[INFO] [stdout]  --> src/bin/parser.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use grammar::lr0::lr0_item_set_family::LR0ItemSetFamily;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `grammar::lr1::lr1_item_set_family::LR1ItemSetFamily`
[INFO] [stdout]  --> src/bin/parser.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use grammar::lr1::lr1_item_set_family::LR1ItemSetFamily;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `lalr1`, `ll1`
[INFO] [stdout]   --> src/bin/parser.rs:11:26
[INFO] [stdout]    |
[INFO] [stdout] 11 | use grammar::{lr0, slr1, ll1, lr1, lalr1};
[INFO] [stdout]    |                          ^^^       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `grammar::parse_tree::ParseTree`
[INFO] [stdout]   --> src/bin/parser.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use grammar::parse_tree::ParseTree;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/bin/parser.rs:173:17
[INFO] [stdout]     |
[INFO] [stdout] 173 |             let mut grammar = Grammar::from_advanced_file(&f).unwrap();
[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::io::prelude`
[INFO] [stdout]   --> src/bin/exam.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | use std::io::prelude::*;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `parse_tree`
[INFO] [stdout]    --> src/bin/exam.rs:360:14
[INFO] [stdout]     |
[INFO] [stdout] 360 |         let (parse_tree, table) = ll_table.analysis_with_process(&token_stream, g.origin.clone());
[INFO] [stdout]     |              ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_parse_tree`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/bin/parser.rs:120:9
[INFO] [stdout]     |
[INFO] [stdout] 120 |         file.write_all(serialized.as_bytes());
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/bin/parser.rs:193:9
[INFO] [stdout]     |
[INFO] [stdout] 193 |         outf.write_all(json.as_bytes());
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/exam.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     io::stdin().read_line(&mut input);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Token`
[INFO] [stdout]  --> src/ll_table/mod.rs:3:33
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::token::{TokenStream, Token};
[INFO] [stdout]   |                                 ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `NonLeafNode`
[INFO] [stdout]  --> src/ll_table/mod.rs:4:36
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::parse_tree::{ParseTree, NonLeafNode};
[INFO] [stdout]   |                                    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Token`
[INFO] [stdout]  --> src/lr_table/mod.rs:3:33
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::token::{TokenStream, Token};
[INFO] [stdout]   |                                 ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Token`
[INFO] [stdout]  --> src/lr_table/lalr_table.rs:2:33
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::token::{TokenStream, Token};
[INFO] [stdout]   |                                 ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::VecDeque`
[INFO] [stdout]  --> src/lr0/lr0_item_set_family.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::collections::VecDeque;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::thread_rng`
[INFO] [stdout]  --> src/lr0/lr0_item_set_family.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use rand::thread_rng;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `VecDeque`
[INFO] [stdout]  --> src/lr1/lr1_item_set_family.rs:7:33
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::collections::{HashMap, VecDeque};
[INFO] [stdout]   |                                 ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::thread_rng`
[INFO] [stdout]   --> src/lr1/lr1_item_set_family.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use rand::thread_rng;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self::lr1_item_set::LR1ItemSet`
[INFO] [stdout]  --> src/lr1/mod.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use self::lr1_item_set::LR1ItemSet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::grammar::letter::Letter`
[INFO] [stdout]  --> src/parse_tree/mod.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::grammar::letter::Letter;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ActionTableItem`, `LRTable`
[INFO] [stdout]  --> src/parse_tree/mod.rs:5:23
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::lr_table::{LRTable, ActionTableItem};
[INFO] [stdout]   |                       ^^^^^^^  ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TokenStream`
[INFO] [stdout]  --> src/parse_tree/mod.rs:6:20
[INFO] [stdout]   |
[INFO] [stdout] 6 | use crate::token::{TokenStream, Token};
[INFO] [stdout]   |                    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::utils`
[INFO] [stdout]  --> src/automaton/dfa.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::utils;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/automaton/dfa.rs:124:9
[INFO] [stdout]     |
[INFO] [stdout] 124 |         'bigloop: loop {
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/automaton/dfa.rs:130:13
[INFO] [stdout]     |
[INFO] [stdout] 130 |             'everysplit: for p in split.iter() {
[INFO] [stdout]     |             ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/automaton/dfa.rs:131:17
[INFO] [stdout]     |
[INFO] [stdout] 131 |                 'everyletter: for letter in self.letters.iter() {
[INFO] [stdout]     |                 ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::utils`
[INFO] [stdout]  --> src/optimization/du.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::utils;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tree_stack`
[INFO] [stdout]   --> src/ll_table/mod.rs:80:17
[INFO] [stdout]    |
[INFO] [stdout] 80 |         let mut tree_stack: Vec<ParseTree> = Vec::new();
[INFO] [stdout]    |                 ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_tree_stack`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/lr1/mod.rs:17:10
[INFO] [stdout]    |
[INFO] [stdout] 17 |     for (i, item_set) in data.item_sets.iter().enumerate() {
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/optimization/dominant.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     for i in 0..lines.len() {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `uses`
[INFO] [stdout]   --> src/optimization/ud.rs:56:27
[INFO] [stdout]    |
[INFO] [stdout] 56 |         for (point, left, uses) in block.iter() {
[INFO] [stdout]    |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_uses`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/grammar/letter.rs:47:13
[INFO] [stdout]    |
[INFO] [stdout] 47 |         let mut temp = match self {
[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/ll_table/mod.rs:80:13
[INFO] [stdout]    |
[INFO] [stdout] 80 |         let mut tree_stack: Vec<ParseTree> = Vec::new();
[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/lr_table/mod.rs:172:13
[INFO] [stdout]     |
[INFO] [stdout] 172 |         let mut letter_stream: Vec<Letter> = token_stream.stream.iter().map(
[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/lr_table/mod.rs:292:13
[INFO] [stdout]     |
[INFO] [stdout] 292 |         let mut letter_stream: Vec<Letter> = token_stream.stream.iter().map(
[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/lr_table/lalr_table.rs:95:13
[INFO] [stdout]    |
[INFO] [stdout] 95 |         let mut letter_stream: Vec<Letter> = token_stream.stream.iter().map(
[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/lr0/lr0_item_set_family.rs:115:17
[INFO] [stdout]     |
[INFO] [stdout] 115 |             let mut shuffle = &mut signs[..];
[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/lr1/lr1_item_set_family.rs:109:17
[INFO] [stdout]     |
[INFO] [stdout] 109 |             let mut shuffle = &mut signs[..];
[INFO] [stdout]     |                 ----^^^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/parse_tree/mod.rs:75:17
[INFO] [stdout]    |
[INFO] [stdout] 75 |                 state.serialize_field("children", &n.children);
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 29 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 3.39s
[INFO] running `Command { std: "docker" "inspect" "30af7faa88d3295a59c859bc306ff611a8c9a6adc35350079f1c4814f583801f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "30af7faa88d3295a59c859bc306ff611a8c9a6adc35350079f1c4814f583801f", kill_on_drop: false }`
[INFO] [stdout] 30af7faa88d3295a59c859bc306ff611a8c9a6adc35350079f1c4814f583801f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "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" "+beta-2021-08-01" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] b353cacb830e9987e7e330eea918f6e0b7d349827b86b69cbce2ece4ec148930
[INFO] running `Command { std: "docker" "start" "-a" "b353cacb830e9987e7e330eea918f6e0b7d349827b86b69cbce2ece4ec148930", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: unused import: `Token`
[INFO] [stderr]  --> src/ll_table/mod.rs:3:33
[INFO] [stderr]   |
[INFO] [stderr] 3 | use crate::token::{TokenStream, Token};
[INFO] [stderr]   |                                 ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `NonLeafNode`
[INFO] [stderr]  --> src/ll_table/mod.rs:4:36
[INFO] [stderr]   |
[INFO] [stderr] 4 | use crate::parse_tree::{ParseTree, NonLeafNode};
[INFO] [stderr]   |                                    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Token`
[INFO] [stderr]  --> src/lr_table/mod.rs:3:33
[INFO] [stderr]   |
[INFO] [stderr] 3 | use crate::token::{TokenStream, Token};
[INFO] [stderr]   |                                 ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Token`
[INFO] [stderr]  --> src/lr_table/lalr_table.rs:2:33
[INFO] [stderr]   |
[INFO] [stderr] 2 | use crate::token::{TokenStream, Token};
[INFO] [stderr]   |                                 ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::VecDeque`
[INFO] [stderr]  --> src/lr0/lr0_item_set_family.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::collections::VecDeque;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rand::thread_rng`
[INFO] [stderr]  --> src/lr0/lr0_item_set_family.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use rand::thread_rng;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `VecDeque`
[INFO] [stderr]  --> src/lr1/lr1_item_set_family.rs:7:33
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::collections::{HashMap, VecDeque};
[INFO] [stderr]   |                                 ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rand::thread_rng`
[INFO] [stderr]   --> src/lr1/lr1_item_set_family.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use rand::thread_rng;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `self::lr1_item_set::LR1ItemSet`
[INFO] [stderr]  --> src/lr1/mod.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use self::lr1_item_set::LR1ItemSet;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::grammar::letter::Letter`
[INFO] [stderr]  --> src/parse_tree/mod.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use crate::grammar::letter::Letter;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `ActionTableItem`, `LRTable`
[INFO] [stderr]  --> src/parse_tree/mod.rs:5:23
[INFO] [stderr]   |
[INFO] [stderr] 5 | use crate::lr_table::{LRTable, ActionTableItem};
[INFO] [stderr]   |                       ^^^^^^^  ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `TokenStream`
[INFO] [stderr]  --> src/parse_tree/mod.rs:6:20
[INFO] [stderr]   |
[INFO] [stderr] 6 | use crate::token::{TokenStream, Token};
[INFO] [stderr]   |                    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::utils`
[INFO] [stderr]  --> src/automaton/dfa.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use crate::utils;
[INFO] [stderr]   |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused label
[INFO] [stderr]    --> src/automaton/dfa.rs:124:9
[INFO] [stderr]     |
[INFO] [stderr] 124 |         'bigloop: loop {
[INFO] [stderr]     |         ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_labels)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused label
[INFO] [stderr]    --> src/automaton/dfa.rs:130:13
[INFO] [stderr]     |
[INFO] [stderr] 130 |             'everysplit: for p in split.iter() {
[INFO] [stderr]     |             ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused label
[INFO] [stderr]    --> src/automaton/dfa.rs:131:17
[INFO] [stderr]     |
[INFO] [stderr] 131 |                 'everyletter: for letter in self.letters.iter() {
[INFO] [stderr]     |                 ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::utils`
[INFO] [stderr]  --> src/optimization/du.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use crate::utils;
[INFO] [stderr]   |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `tree_stack`
[INFO] [stderr]   --> src/ll_table/mod.rs:80:17
[INFO] [stderr]    |
[INFO] [stderr] 80 |         let mut tree_stack: Vec<ParseTree> = Vec::new();
[INFO] [stderr]    |                 ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_tree_stack`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/lr1/mod.rs:17:10
[INFO] [stderr]    |
[INFO] [stderr] 17 |     for (i, item_set) in data.item_sets.iter().enumerate() {
[INFO] [stderr]    |          ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/optimization/dominant.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     for i in 0..lines.len() {
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `uses`
[INFO] [stderr]   --> src/optimization/ud.rs:56:27
[INFO] [stderr]    |
[INFO] [stderr] 56 |         for (point, left, uses) in block.iter() {
[INFO] [stderr]    |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_uses`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/grammar/letter.rs:47:13
[INFO] [stderr]    |
[INFO] [stderr] 47 |         let mut temp = match self {
[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/ll_table/mod.rs:80:13
[INFO] [stderr]    |
[INFO] [stderr] 80 |         let mut tree_stack: Vec<ParseTree> = Vec::new();
[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/lr_table/mod.rs:172:13
[INFO] [stderr]     |
[INFO] [stderr] 172 |         let mut letter_stream: Vec<Letter> = token_stream.stream.iter().map(
[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/lr_table/mod.rs:292:13
[INFO] [stderr]     |
[INFO] [stderr] 292 |         let mut letter_stream: Vec<Letter> = token_stream.stream.iter().map(
[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/lr_table/lalr_table.rs:95:13
[INFO] [stderr]    |
[INFO] [stderr] 95 |         let mut letter_stream: Vec<Letter> = token_stream.stream.iter().map(
[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/lr0/lr0_item_set_family.rs:115:17
[INFO] [stderr]     |
[INFO] [stderr] 115 |             let mut shuffle = &mut signs[..];
[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/lr1/lr1_item_set_family.rs:109:17
[INFO] [stderr]     |
[INFO] [stderr] 109 |             let mut shuffle = &mut signs[..];
[INFO] [stderr]     |                 ----^^^^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/parse_tree/mod.rs:75:17
[INFO] [stderr]    |
[INFO] [stderr] 75 |                 state.serialize_field("children", &n.children);
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: `grammar` (lib) generated 29 warnings
[INFO] [stderr] warning: `grammar` (lib test) generated 29 warnings (29 duplicates)
[INFO] [stderr] warning: unused import: `grammar::first_follow_set::FirstFollowSet`
[INFO] [stderr]  --> src/bin/parser.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use grammar::first_follow_set::FirstFollowSet;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `grammar::lr0::lr0_item_set_family::LR0ItemSetFamily`
[INFO] [stderr]  --> src/bin/parser.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use grammar::lr0::lr0_item_set_family::LR0ItemSetFamily;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `grammar::lr1::lr1_item_set_family::LR1ItemSetFamily`
[INFO] [stderr]  --> src/bin/parser.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use grammar::lr1::lr1_item_set_family::LR1ItemSetFamily;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `lalr1`, `ll1`
[INFO] [stderr]   --> src/bin/parser.rs:11:26
[INFO] [stderr]    |
[INFO] [stderr] 11 | use grammar::{lr0, slr1, ll1, lr1, lalr1};
[INFO] [stderr]    |                          ^^^       ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `grammar::parse_tree::ParseTree`
[INFO] [stderr]   --> src/bin/parser.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 | use grammar::parse_tree::ParseTree;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/bin/parser.rs:173:17
[INFO] [stderr]     |
[INFO] [stderr] 173 |             let mut grammar = Grammar::from_advanced_file(&f).unwrap();
[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: unused `Result` that must be used
[INFO] [stderr]    --> src/bin/parser.rs:120:9
[INFO] [stderr]     |
[INFO] [stderr] 120 |         file.write_all(serialized.as_bytes());
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/bin/parser.rs:193:9
[INFO] [stderr]     |
[INFO] [stderr] 193 |         outf.write_all(json.as_bytes());
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `grammar::lr_table::LRTable`
[INFO] [stderr]   --> src/bin/exam.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 | use grammar::lr_table::LRTable;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `grammar::parse_tree::ParseTree`
[INFO] [stderr]   --> src/bin/exam.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 | use grammar::parse_tree::ParseTree;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fs::File`
[INFO] [stderr]   --> src/bin/exam.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 | use std::fs::File;
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fs`
[INFO] [stderr]   --> src/bin/exam.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 | use std::fs;
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::prelude`
[INFO] [stderr]   --> src/bin/exam.rs:27:5
[INFO] [stderr]    |
[INFO] [stderr] 27 | use std::io::prelude::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `parse_tree`
[INFO] [stderr]    --> src/bin/exam.rs:360:14
[INFO] [stderr]     |
[INFO] [stderr] 360 |         let (parse_tree, table) = ll_table.analysis_with_process(&token_stream, g.origin.clone());
[INFO] [stderr]     |              ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_parse_tree`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/bin/exam.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     io::stdin().read_line(&mut input);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: `grammar` (bin "parser" test) generated 8 warnings
[INFO] [stderr] warning: `grammar` (bin "exam" test) generated 7 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.30s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/grammar-c4b3ae4c1574af42)
[INFO] [stdout] 
[INFO] [stdout] running 8 tests
[INFO] [stdout] test grammar::letter::test::test_letter_2 ... ok
[INFO] [stdout] test grammar::rule::test::test_rule_1 ... ok
[INFO] [stdout] test grammar::letter::test::test_letter_1 ... ok
[INFO] [stdout] test grammar::rule::test::test_rule_2 ... ok
[INFO] [stdout] test grammar::letter::test::test_letter_3 ... ok
[INFO] [stdout] test grammar::rule::test::test_rule_4 ... ok
[INFO] [stdout] test grammar::rule::test::test_rule_3 ... ok
[INFO] [stdout] test grammar::test::test_grammar_1 ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- grammar::test::test_grammar_1 stdout ----
[INFO] [stdout] thread 'grammar::test::test_grammar_1' panicked at 'assertion failed: `(left == right)`
[INFO] [stdout]   left: `rules:
[INFO] [stdout]     S -> Aa|a
[INFO] [stdout]     A -> ab|S
[INFO] [stdout] origin:
[INFO] [stdout]     S
[INFO] [stdout] terminals:
[INFO] [stdout]     a, |, b, S, A, 
[INFO] [stdout] non terminals:
[INFO] [stdout]     S, A, `,
[INFO] [stdout]  right: `rules:
[INFO] [stdout] origin:
[INFO] [stdout]     .
[INFO] [stdout] terminals:
[INFO] [stdout]     
[INFO] [stdout] non terminals:
[INFO] [stdout]     `', src/grammar/mod.rs:267:9
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x5607395ac4b0 - std::backtrace_rs::backtrace::libunwind::trace::hff4d1766e93f64f1
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
[INFO] [stdout]    1:     0x5607395ac4b0 - std::backtrace_rs::backtrace::trace_unsynchronized::h56bbc8eb78770bcb
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stdout]    2:     0x5607395ac4b0 - std::sys_common::backtrace::_print_fmt::h5c8e75464faca780
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/sys_common/backtrace.rs:67:5
[INFO] [stdout]    3:     0x5607395ac4b0 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h48b88277def8b362
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/sys_common/backtrace.rs:46:22
[INFO] [stdout]    4:     0x5607395cec7c - core::fmt::write::h3381b3176fe2b3d3
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/core/src/fmt/mod.rs:1115:17
[INFO] [stdout]    5:     0x5607395a9415 - std::io::Write::write_fmt::h5f34a676f60246b5
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/io/mod.rs:1665:15
[INFO] [stdout]    6:     0x5607395ae62b - std::sys_common::backtrace::_print::ha537687d6c17dd0d
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/sys_common/backtrace.rs:49:5
[INFO] [stdout]    7:     0x5607395ae62b - std::sys_common::backtrace::print::h61376ae57d131d72
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/sys_common/backtrace.rs:36:9
[INFO] [stdout]    8:     0x5607395ae62b - std::panicking::default_hook::{{closure}}::h0f7208c0b9644a54
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panicking.rs:208:50
[INFO] [stdout]    9:     0x5607395ae13c - std::panicking::default_hook::hdac7fc06578c14ce
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panicking.rs:222:9
[INFO] [stdout]   10:     0x5607395aecf4 - std::panicking::rust_panic_with_hook::h72b21c283da3d1ef
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panicking.rs:622:17
[INFO] [stdout]   11:     0x5607395ae7d7 - std::panicking::begin_panic_handler::{{closure}}::he5778f1729cff84a
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panicking.rs:519:13
[INFO] [stdout]   12:     0x5607395ac98c - std::sys_common::backtrace::__rust_end_short_backtrace::h2d11ca8b453b4b1d
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/sys_common/backtrace.rs:141:18
[INFO] [stdout]   13:     0x5607395ae739 - rust_begin_unwind
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panicking.rs:515:5
[INFO] [stdout]   14:     0x56073953d3b1 - core::panicking::panic_fmt::hf9de31d4acbce4db
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/core/src/panicking.rs:92:14
[INFO] [stdout]   15:     0x5607395cd598 - core::panicking::assert_failed_inner::h62e8cb2847a6e7ec
[INFO] [stdout]   16:     0x56073954b48a - core::panicking::assert_failed::h2546110ad998d32c
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/core/src/panicking.rs:117:5
[INFO] [stdout]   17:     0x560739541cb2 - grammar::grammar::test::test_grammar_1::h1cd5fff85131c67b
[INFO] [stdout]                                at /opt/rustwide/workdir/src/grammar/mod.rs:267:9
[INFO] [stdout]   18:     0x5607395419aa - grammar::grammar::test::test_grammar_1::{{closure}}::h3621fb4a27be6da2
[INFO] [stdout]                                at /opt/rustwide/workdir/src/grammar/mod.rs:261:5
[INFO] [stdout]   19:     0x56073954a16e - core::ops::function::FnOnce::call_once::hc348b31c4e33de71
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/core/src/ops/function.rs:227:5
[INFO] [stdout]   20:     0x560739580b43 - core::ops::function::FnOnce::call_once::hbb52c4519d3137b0
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/core/src/ops/function.rs:227:5
[INFO] [stdout]   21:     0x560739580b43 - test::__rust_begin_short_backtrace::h86fe3a2a5a5121af
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/test/src/lib.rs:578:5
[INFO] [stdout]   22:     0x56073957f5f8 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hfd956bc3d57399be
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/alloc/src/boxed.rs:1572:9
[INFO] [stdout]   23:     0x56073957f5f8 - <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h40dc93e0ddb5938a
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panic.rs:347:9
[INFO] [stdout]   24:     0x56073957f5f8 - std::panicking::try::do_call::h90d07750cb47c562
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panicking.rs:401:40
[INFO] [stdout]   25:     0x56073957f5f8 - std::panicking::try::h063c84733ad2a629
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panicking.rs:365:19
[INFO] [stdout]   26:     0x56073957f5f8 - std::panic::catch_unwind::h0c464836a84e7c08
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panic.rs:434:14
[INFO] [stdout]   27:     0x56073957f5f8 - test::run_test_in_process::h5cb06ef620b157fc
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/test/src/lib.rs:601:18
[INFO] [stdout]   28:     0x56073957f5f8 - test::run_test::run_test_inner::{{closure}}::h76f677f4b93f9828
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/test/src/lib.rs:493:39
[INFO] [stdout]   29:     0x56073954dd8d - test::run_test::run_test_inner::{{closure}}::h366d01fe04f4d67a
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/test/src/lib.rs:520:37
[INFO] [stdout]   30:     0x56073954dd8d - std::sys_common::backtrace::__rust_begin_short_backtrace::h7dfa0de4eb395af2
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/sys_common/backtrace.rs:125:18
[INFO] [stdout]   31:     0x560739552558 - std::thread::Builder::spawn_unchecked::{{closure}}::{{closure}}::hf0a74bb58798037f
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/thread/mod.rs:476:17
[INFO] [stdout]   32:     0x560739552558 - <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::hb024e854818586ac
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panic.rs:347:9
[INFO] [stdout]   33:     0x560739552558 - std::panicking::try::do_call::hb2dd9f1d0d48e41d
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panicking.rs:401:40
[INFO] [stdout]   34:     0x560739552558 - std::panicking::try::h4717ae7bac8b2bf3
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panicking.rs:365:19
[INFO] [stdout]   35:     0x560739552558 - std::panic::catch_unwind::h0dc8a061326ce8d8
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panic.rs:434:14
[INFO] [stdout]   36:     0x560739552558 - std::thread::Builder::spawn_unchecked::{{closure}}::haa369e2d6fd00aa1
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/thread/mod.rs:475:30
[INFO] [stdout]   37:     0x560739552558 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h36dcf3de8b056f17
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/core/src/ops/function.rs:227:5
[INFO] [stdout]   38:     0x5607395b3867 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h65c29e4642be2358
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/alloc/src/boxed.rs:1572:9
[INFO] [stdout]   39:     0x5607395b3867 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hd0f8f7fbbd9fffbf
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/alloc/src/boxed.rs:1572:9
[INFO] [stdout]   40:     0x5607395b3867 - std::sys::unix::thread::Thread::new::thread_start::h2fd22fee3ca77b65
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/sys/unix/thread.rs:74:17
[INFO] [stdout]   41:     0x7f6749ed5609 - start_thread
[INFO] [stdout]   42:     0x7f6749cad293 - clone
[INFO] [stdout]   43:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     grammar::test::test_grammar_1
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 7 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.03s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--lib'
[INFO] running `Command { std: "docker" "inspect" "b353cacb830e9987e7e330eea918f6e0b7d349827b86b69cbce2ece4ec148930", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b353cacb830e9987e7e330eea918f6e0b7d349827b86b69cbce2ece4ec148930", kill_on_drop: false }`
[INFO] [stdout] b353cacb830e9987e7e330eea918f6e0b7d349827b86b69cbce2ece4ec148930
