[INFO] cloning repository https://github.com/StephyGao/Programming-Language-Parser-
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/StephyGao/Programming-Language-Parser-" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FStephyGao%2FProgramming-Language-Parser-", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FStephyGao%2FProgramming-Language-Parser-'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 356c71008470558afab5d0ba9e6bfb39c6cee43b
[INFO] testing StephyGao/Programming-Language-Parser- against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FStephyGao%2FProgramming-Language-Parser-" "/workspace/builds/worker-27/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-27/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/StephyGao/Programming-Language-Parser- on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/StephyGao/Programming-Language-Parser-
[INFO] finished tweaking git repo https://github.com/StephyGao/Programming-Language-Parser-
[INFO] tweaked toml for git repo https://github.com/StephyGao/Programming-Language-Parser- written to /workspace/builds/worker-27/source/Cargo.toml
[INFO] crate git repo https://github.com/StephyGao/Programming-Language-Parser- already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c38e7fe50337084c2e0ee92151abad9b0a72cac1dee70f2c58ed231a7fe9cfe7
[INFO] running `Command { std: "docker" "start" "-a" "c38e7fe50337084c2e0ee92151abad9b0a72cac1dee70f2c58ed231a7fe9cfe7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c38e7fe50337084c2e0ee92151abad9b0a72cac1dee70f2c58ed231a7fe9cfe7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c38e7fe50337084c2e0ee92151abad9b0a72cac1dee70f2c58ed231a7fe9cfe7", kill_on_drop: false }`
[INFO] [stdout] c38e7fe50337084c2e0ee92151abad9b0a72cac1dee70f2c58ed231a7fe9cfe7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ea531a501f58c8c41515e4a8cb68f918b0709d4ebd6150a748ac5974de80df6c
[INFO] running `Command { std: "docker" "start" "-a" "ea531a501f58c8c41515e4a8cb68f918b0709d4ebd6150a748ac5974de80df6c", kill_on_drop: false }`
[INFO] [stderr]    Compiling parser v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/character_stream.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::convert::TryFrom`
[INFO] [stdout]  --> src/character_stream.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::convert::TryFrom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:151:9
[INFO] [stdout]     |
[INFO] [stdout] 127 | /         match self.check_declaration_type(pos) {
[INFO] [stdout] 128 | |             Some(next_pos) => {
[INFO] [stdout] 129 | |                 pos = next_pos;
[INFO] [stdout] 130 | |                 match self.check_variable_declaration(pos) {
[INFO] [stdout] ...   |
[INFO] [stdout] 149 | |             _ => { return None; }
[INFO] [stdout] 150 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 151 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:201:9
[INFO] [stdout]     |
[INFO] [stdout] 155 | /         match self.tokens.get(pos) {
[INFO] [stdout] 156 | |             Some(token) => {
[INFO] [stdout] 157 | |                 if token.get_text() == "void" {
[INFO] [stdout] 158 | |                     pos += 1;
[INFO] [stdout] ...   |
[INFO] [stdout] 199 | |             _ => { return None; }
[INFO] [stdout] 200 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 201 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:223:9
[INFO] [stdout]     |
[INFO] [stdout] 205 | /         match self.check_declaration_type(pos) {
[INFO] [stdout] 206 | |             Some(next_pos) => {
[INFO] [stdout] 207 | |                 match self.check_parameter_block(next_pos) {
[INFO] [stdout] 208 | |                     Some(next_pos2) => {
[INFO] [stdout] ...   |
[INFO] [stdout] 221 | |             _ => { return None; }
[INFO] [stdout] 222 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 223 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:244:9
[INFO] [stdout]     |
[INFO] [stdout] 227 | /         match self.check_data_type(pos) {
[INFO] [stdout] 228 | |             Some(next_pos) => {
[INFO] [stdout] 229 | |                 pos = next_pos;
[INFO] [stdout] 230 | |                 match self.tokens.get(pos) {
[INFO] [stdout] ...   |
[INFO] [stdout] 242 | |             _ => { return None; }
[INFO] [stdout] 243 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 244 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:273:9
[INFO] [stdout]     |
[INFO] [stdout] 248 | /         match self.tokens.get(pos) {
[INFO] [stdout] 249 | |             Some(token) => {
[INFO] [stdout] 250 | |                 if token.get_text() == "=" {
[INFO] [stdout] 251 | |                     pos += 1;
[INFO] [stdout] ...   |
[INFO] [stdout] 271 | |             _ => { return None; }
[INFO] [stdout] 272 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 273 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 277 | /         match self.check_parameter_block(pos) {
[INFO] [stdout] 278 | |             Some(next_pos) => {
[INFO] [stdout] 279 | |                 pos = next_pos;
[INFO] [stdout] 280 | |                 match self.tokens.get(pos) {
[INFO] [stdout] ...   |
[INFO] [stdout] 292 | |             _ => { return None; }
[INFO] [stdout] 293 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 294 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:337:9
[INFO] [stdout]     |
[INFO] [stdout] 298 | /         match self.tokens.get(pos) {
[INFO] [stdout] 299 | |             Some(token) => {
[INFO] [stdout] 300 | |                 if token.get_text() == "{" {
[INFO] [stdout] 301 | |                     pos += 1;
[INFO] [stdout] ...   |
[INFO] [stdout] 335 | |             _ => { return None; }
[INFO] [stdout] 336 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 337 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:392:9
[INFO] [stdout]     |
[INFO] [stdout] 343 | /         match self.tokens.get(pos) {
[INFO] [stdout] 344 | |             Some(token) => {
[INFO] [stdout] 345 | |                 if token.get_text() == "(" { //是不是 （
[INFO] [stdout] 346 | |                     pos += 1;
[INFO] [stdout] ...   |
[INFO] [stdout] 390 | |             _ => { return None; }
[INFO] [stdout] 391 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 392 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:419:9
[INFO] [stdout]     |
[INFO] [stdout] 408 | /         match self.tokens.get(pos) {
[INFO] [stdout] 409 | |             Some(token) => {
[INFO] [stdout] 410 | |                 if token.is_constant() {
[INFO] [stdout] 411 | |                     pos += 1;
[INFO] [stdout] ...   |
[INFO] [stdout] 417 | |             _ => { return None; }
[INFO] [stdout] 418 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 419 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:475:9
[INFO] [stdout]     |
[INFO] [stdout] 458 | /         match self.check_data_type(pos) {
[INFO] [stdout] 459 | |             Some(next_pos) => {
[INFO] [stdout] 460 | |                 pos = next_pos;
[INFO] [stdout] 461 | |                 match self.tokens.get(pos) {
[INFO] [stdout] ...   |
[INFO] [stdout] 473 | |             _ => { return None; }
[INFO] [stdout] 474 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 475 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:499:9
[INFO] [stdout]     |
[INFO] [stdout] 487 | /         match self.tokens.get(pos) {
[INFO] [stdout] 488 | |             Some(token) => {
[INFO] [stdout] 489 | |                 match token.get_text() {
[INFO] [stdout] 490 | |                     "char" | "short" | "int" | "long" => {
[INFO] [stdout] ...   |
[INFO] [stdout] 497 | |             _ => { return None; }
[INFO] [stdout] 498 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 499 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:575:9
[INFO] [stdout]     |
[INFO] [stdout] 519 | /         match self.tokens.get(pos) {
[INFO] [stdout] 520 | |             Some(token) => {
[INFO] [stdout] 521 | |                 if token.is_identifier() {
[INFO] [stdout] 522 | |                     pos += 1;
[INFO] [stdout] ...   |
[INFO] [stdout] 573 | |             _ => { return None; }
[INFO] [stdout] 574 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 575 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:621:9
[INFO] [stdout]     |
[INFO] [stdout] 579 | /         match self.tokens.get(pos) {
[INFO] [stdout] 580 | |             Some(token) => {
[INFO] [stdout] 581 | |                 if token.get_text() == "while" {
[INFO] [stdout] 582 | |                     pos += 1;
[INFO] [stdout] ...   |
[INFO] [stdout] 619 | |             _ => { return None; }
[INFO] [stdout] 620 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 621 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:667:9
[INFO] [stdout]     |
[INFO] [stdout] 625 | /         match self.tokens.get(pos) {
[INFO] [stdout] 626 | |             Some(token) => {
[INFO] [stdout] 627 | |                 if token.get_text() == "if" {
[INFO] [stdout] 628 | |                     pos += 1;
[INFO] [stdout] ...   |
[INFO] [stdout] 665 | |             _ => { return None; }
[INFO] [stdout] 666 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 667 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:698:9
[INFO] [stdout]     |
[INFO] [stdout] 671 | /         match self.tokens.get(pos) {
[INFO] [stdout] 672 | |             Some(token) => {
[INFO] [stdout] 673 | |                 if token.get_text() == "return" {
[INFO] [stdout] 674 | |                     pos += 1;
[INFO] [stdout] ...   |
[INFO] [stdout] 696 | |             _ => { return None; }
[INFO] [stdout] 697 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 698 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:719:9
[INFO] [stdout]     |
[INFO] [stdout] 702 | /         match self.check_simple_expression(pos) {
[INFO] [stdout] 703 | |             Some(next_pos) => {
[INFO] [stdout] 704 | |                 pos = next_pos;
[INFO] [stdout] 705 | |                 match self.check_relation_operator(pos) {
[INFO] [stdout] ...   |
[INFO] [stdout] 717 | |             _ => { return None; }
[INFO] [stdout] 718 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 719 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:742:9
[INFO] [stdout]     |
[INFO] [stdout] 723 | /         match self.check_term(pos) {
[INFO] [stdout] 724 | |             Some(next_pos) => {
[INFO] [stdout] 725 | |                 pos = next_pos;
[INFO] [stdout] 726 | |                 loop {
[INFO] [stdout] ...   |
[INFO] [stdout] 740 | |             _ => { return None; }
[INFO] [stdout] 741 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 742 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:765:9
[INFO] [stdout]     |
[INFO] [stdout] 746 | /         match self.check_factor(pos) {
[INFO] [stdout] 747 | |             Some(next_pos) => {
[INFO] [stdout] 748 | |                 pos = next_pos;
[INFO] [stdout] 749 | |                 loop {
[INFO] [stdout] ...   |
[INFO] [stdout] 763 | |             _ => { return None; }
[INFO] [stdout] 764 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 765 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:869:9
[INFO] [stdout]     |
[INFO] [stdout] 857 | /         match self.tokens.get(pos) {
[INFO] [stdout] 858 | |             Some(token) => {
[INFO] [stdout] 859 | |                 match token.get_text() {
[INFO] [stdout] 860 | |                     "==" | "<" | ">" | "<=" | ">=" | "!=" => { 
[INFO] [stdout] ...   |
[INFO] [stdout] 867 | |             _ => { return None; }
[INFO] [stdout] 868 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 869 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:885:9
[INFO] [stdout]     |
[INFO] [stdout] 873 | /         match self.tokens.get(pos) {
[INFO] [stdout] 874 | |             Some(token) => {
[INFO] [stdout] 875 | |                 match token.get_text() {
[INFO] [stdout] 876 | |                     "+" | "-" => { 
[INFO] [stdout] ...   |
[INFO] [stdout] 883 | |             _ => { return None; }
[INFO] [stdout] 884 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 885 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:901:9
[INFO] [stdout]     |
[INFO] [stdout] 889 | /         match self.tokens.get(pos) {
[INFO] [stdout] 890 | |             Some(token) => {
[INFO] [stdout] 891 | |                 match token.get_text() {
[INFO] [stdout] 892 | |                     "*" | "/" => {
[INFO] [stdout] ...   |
[INFO] [stdout] 899 | |             _ => { return None; }
[INFO] [stdout] 900 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 901 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/parser.rs:35:18
[INFO] [stdout]    |
[INFO] [stdout] 35 |             Some(x) => {
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `space_num` is never read
[INFO] [stdout]   --> src/parser.rs:52:17
[INFO] [stdout]    |
[INFO] [stdout] 52 |         let mut space_num = 0;
[INFO] [stdout]    |                 ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]   --> src/parser.rs:99:21
[INFO] [stdout]    |
[INFO] [stdout] 99 |                 for j in 0..space_num {
[INFO] [stdout]    |                     ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/parser.rs:24:22
[INFO] [stdout]    |
[INFO] [stdout] 24 |                 Some(mut token) => {
[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/parser.rs:56:17
[INFO] [stdout]    |
[INFO] [stdout] 56 |             let mut text = self.tokens[i].get_text();
[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/parser.rs:204:49
[INFO] [stdout]     |
[INFO] [stdout] 204 |     pub fn check_function_definition(&mut self, mut pos: usize) -> Option<usize> {
[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/parser.rs:801:13
[INFO] [stdout]     |
[INFO] [stdout] 801 |         let mut last_pos = pos;
[INFO] [stdout]     |             ----^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `from_str`
[INFO] [stdout]   --> src/character_stream.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn from_str(s: &str) -> CharStream {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `more_available`
[INFO] [stdout]   --> src/character_stream.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 |     pub fn more_available(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `NONE`
[INFO] [stdout]  --> src/token.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     NONE,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: `TokenType` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]  --> src/token.rs:1:10
[INFO] [stdout]   |
[INFO] [stdout] 1 | #[derive(Debug)]
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout]   = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `as_str`
[INFO] [stdout]   --> src/token.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     pub fn as_str(&self) -> &'static str {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 34 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.31s
[INFO] running `Command { std: "docker" "inspect" "ea531a501f58c8c41515e4a8cb68f918b0709d4ebd6150a748ac5974de80df6c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ea531a501f58c8c41515e4a8cb68f918b0709d4ebd6150a748ac5974de80df6c", kill_on_drop: false }`
[INFO] [stdout] ea531a501f58c8c41515e4a8cb68f918b0709d4ebd6150a748ac5974de80df6c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4d8f5239fcc471f12ddabdb2550fb1bf421b7fa4fbb083995f984e08f56b01fa
[INFO] running `Command { std: "docker" "start" "-a" "4d8f5239fcc471f12ddabdb2550fb1bf421b7fa4fbb083995f984e08f56b01fa", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling parser v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/character_stream.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::convert::TryFrom`
[INFO] [stdout]  --> src/character_stream.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::convert::TryFrom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:151:9
[INFO] [stdout]     |
[INFO] [stdout] 127 | /         match self.check_declaration_type(pos) {
[INFO] [stdout] 128 | |             Some(next_pos) => {
[INFO] [stdout] 129 | |                 pos = next_pos;
[INFO] [stdout] 130 | |                 match self.check_variable_declaration(pos) {
[INFO] [stdout] ...   |
[INFO] [stdout] 149 | |             _ => { return None; }
[INFO] [stdout] 150 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 151 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:201:9
[INFO] [stdout]     |
[INFO] [stdout] 155 | /         match self.tokens.get(pos) {
[INFO] [stdout] 156 | |             Some(token) => {
[INFO] [stdout] 157 | |                 if token.get_text() == "void" {
[INFO] [stdout] 158 | |                     pos += 1;
[INFO] [stdout] ...   |
[INFO] [stdout] 199 | |             _ => { return None; }
[INFO] [stdout] 200 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 201 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:223:9
[INFO] [stdout]     |
[INFO] [stdout] 205 | /         match self.check_declaration_type(pos) {
[INFO] [stdout] 206 | |             Some(next_pos) => {
[INFO] [stdout] 207 | |                 match self.check_parameter_block(next_pos) {
[INFO] [stdout] 208 | |                     Some(next_pos2) => {
[INFO] [stdout] ...   |
[INFO] [stdout] 221 | |             _ => { return None; }
[INFO] [stdout] 222 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 223 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:244:9
[INFO] [stdout]     |
[INFO] [stdout] 227 | /         match self.check_data_type(pos) {
[INFO] [stdout] 228 | |             Some(next_pos) => {
[INFO] [stdout] 229 | |                 pos = next_pos;
[INFO] [stdout] 230 | |                 match self.tokens.get(pos) {
[INFO] [stdout] ...   |
[INFO] [stdout] 242 | |             _ => { return None; }
[INFO] [stdout] 243 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 244 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:273:9
[INFO] [stdout]     |
[INFO] [stdout] 248 | /         match self.tokens.get(pos) {
[INFO] [stdout] 249 | |             Some(token) => {
[INFO] [stdout] 250 | |                 if token.get_text() == "=" {
[INFO] [stdout] 251 | |                     pos += 1;
[INFO] [stdout] ...   |
[INFO] [stdout] 271 | |             _ => { return None; }
[INFO] [stdout] 272 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 273 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 277 | /         match self.check_parameter_block(pos) {
[INFO] [stdout] 278 | |             Some(next_pos) => {
[INFO] [stdout] 279 | |                 pos = next_pos;
[INFO] [stdout] 280 | |                 match self.tokens.get(pos) {
[INFO] [stdout] ...   |
[INFO] [stdout] 292 | |             _ => { return None; }
[INFO] [stdout] 293 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 294 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:337:9
[INFO] [stdout]     |
[INFO] [stdout] 298 | /         match self.tokens.get(pos) {
[INFO] [stdout] 299 | |             Some(token) => {
[INFO] [stdout] 300 | |                 if token.get_text() == "{" {
[INFO] [stdout] 301 | |                     pos += 1;
[INFO] [stdout] ...   |
[INFO] [stdout] 335 | |             _ => { return None; }
[INFO] [stdout] 336 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 337 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:392:9
[INFO] [stdout]     |
[INFO] [stdout] 343 | /         match self.tokens.get(pos) {
[INFO] [stdout] 344 | |             Some(token) => {
[INFO] [stdout] 345 | |                 if token.get_text() == "(" { //是不是 （
[INFO] [stdout] 346 | |                     pos += 1;
[INFO] [stdout] ...   |
[INFO] [stdout] 390 | |             _ => { return None; }
[INFO] [stdout] 391 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 392 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:419:9
[INFO] [stdout]     |
[INFO] [stdout] 408 | /         match self.tokens.get(pos) {
[INFO] [stdout] 409 | |             Some(token) => {
[INFO] [stdout] 410 | |                 if token.is_constant() {
[INFO] [stdout] 411 | |                     pos += 1;
[INFO] [stdout] ...   |
[INFO] [stdout] 417 | |             _ => { return None; }
[INFO] [stdout] 418 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 419 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:475:9
[INFO] [stdout]     |
[INFO] [stdout] 458 | /         match self.check_data_type(pos) {
[INFO] [stdout] 459 | |             Some(next_pos) => {
[INFO] [stdout] 460 | |                 pos = next_pos;
[INFO] [stdout] 461 | |                 match self.tokens.get(pos) {
[INFO] [stdout] ...   |
[INFO] [stdout] 473 | |             _ => { return None; }
[INFO] [stdout] 474 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 475 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:499:9
[INFO] [stdout]     |
[INFO] [stdout] 487 | /         match self.tokens.get(pos) {
[INFO] [stdout] 488 | |             Some(token) => {
[INFO] [stdout] 489 | |                 match token.get_text() {
[INFO] [stdout] 490 | |                     "char" | "short" | "int" | "long" => {
[INFO] [stdout] ...   |
[INFO] [stdout] 497 | |             _ => { return None; }
[INFO] [stdout] 498 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 499 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:575:9
[INFO] [stdout]     |
[INFO] [stdout] 519 | /         match self.tokens.get(pos) {
[INFO] [stdout] 520 | |             Some(token) => {
[INFO] [stdout] 521 | |                 if token.is_identifier() {
[INFO] [stdout] 522 | |                     pos += 1;
[INFO] [stdout] ...   |
[INFO] [stdout] 573 | |             _ => { return None; }
[INFO] [stdout] 574 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 575 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:621:9
[INFO] [stdout]     |
[INFO] [stdout] 579 | /         match self.tokens.get(pos) {
[INFO] [stdout] 580 | |             Some(token) => {
[INFO] [stdout] 581 | |                 if token.get_text() == "while" {
[INFO] [stdout] 582 | |                     pos += 1;
[INFO] [stdout] ...   |
[INFO] [stdout] 619 | |             _ => { return None; }
[INFO] [stdout] 620 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 621 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:667:9
[INFO] [stdout]     |
[INFO] [stdout] 625 | /         match self.tokens.get(pos) {
[INFO] [stdout] 626 | |             Some(token) => {
[INFO] [stdout] 627 | |                 if token.get_text() == "if" {
[INFO] [stdout] 628 | |                     pos += 1;
[INFO] [stdout] ...   |
[INFO] [stdout] 665 | |             _ => { return None; }
[INFO] [stdout] 666 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 667 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:698:9
[INFO] [stdout]     |
[INFO] [stdout] 671 | /         match self.tokens.get(pos) {
[INFO] [stdout] 672 | |             Some(token) => {
[INFO] [stdout] 673 | |                 if token.get_text() == "return" {
[INFO] [stdout] 674 | |                     pos += 1;
[INFO] [stdout] ...   |
[INFO] [stdout] 696 | |             _ => { return None; }
[INFO] [stdout] 697 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 698 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:719:9
[INFO] [stdout]     |
[INFO] [stdout] 702 | /         match self.check_simple_expression(pos) {
[INFO] [stdout] 703 | |             Some(next_pos) => {
[INFO] [stdout] 704 | |                 pos = next_pos;
[INFO] [stdout] 705 | |                 match self.check_relation_operator(pos) {
[INFO] [stdout] ...   |
[INFO] [stdout] 717 | |             _ => { return None; }
[INFO] [stdout] 718 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 719 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:742:9
[INFO] [stdout]     |
[INFO] [stdout] 723 | /         match self.check_term(pos) {
[INFO] [stdout] 724 | |             Some(next_pos) => {
[INFO] [stdout] 725 | |                 pos = next_pos;
[INFO] [stdout] 726 | |                 loop {
[INFO] [stdout] ...   |
[INFO] [stdout] 740 | |             _ => { return None; }
[INFO] [stdout] 741 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 742 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:765:9
[INFO] [stdout]     |
[INFO] [stdout] 746 | /         match self.check_factor(pos) {
[INFO] [stdout] 747 | |             Some(next_pos) => {
[INFO] [stdout] 748 | |                 pos = next_pos;
[INFO] [stdout] 749 | |                 loop {
[INFO] [stdout] ...   |
[INFO] [stdout] 763 | |             _ => { return None; }
[INFO] [stdout] 764 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 765 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:869:9
[INFO] [stdout]     |
[INFO] [stdout] 857 | /         match self.tokens.get(pos) {
[INFO] [stdout] 858 | |             Some(token) => {
[INFO] [stdout] 859 | |                 match token.get_text() {
[INFO] [stdout] 860 | |                     "==" | "<" | ">" | "<=" | ">=" | "!=" => { 
[INFO] [stdout] ...   |
[INFO] [stdout] 867 | |             _ => { return None; }
[INFO] [stdout] 868 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 869 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:885:9
[INFO] [stdout]     |
[INFO] [stdout] 873 | /         match self.tokens.get(pos) {
[INFO] [stdout] 874 | |             Some(token) => {
[INFO] [stdout] 875 | |                 match token.get_text() {
[INFO] [stdout] 876 | |                     "+" | "-" => { 
[INFO] [stdout] ...   |
[INFO] [stdout] 883 | |             _ => { return None; }
[INFO] [stdout] 884 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 885 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parser.rs:901:9
[INFO] [stdout]     |
[INFO] [stdout] 889 | /         match self.tokens.get(pos) {
[INFO] [stdout] 890 | |             Some(token) => {
[INFO] [stdout] 891 | |                 match token.get_text() {
[INFO] [stdout] 892 | |                     "*" | "/" => {
[INFO] [stdout] ...   |
[INFO] [stdout] 899 | |             _ => { return None; }
[INFO] [stdout] 900 | |         }
[INFO] [stdout]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stdout] 901 |           None
[INFO] [stdout]     |           ^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/parser.rs:35:18
[INFO] [stdout]    |
[INFO] [stdout] 35 |             Some(x) => {
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `space_num` is never read
[INFO] [stdout]   --> src/parser.rs:52:17
[INFO] [stdout]    |
[INFO] [stdout] 52 |         let mut space_num = 0;
[INFO] [stdout]    |                 ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]   --> src/parser.rs:99:21
[INFO] [stdout]    |
[INFO] [stdout] 99 |                 for j in 0..space_num {
[INFO] [stdout]    |                     ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/parser.rs:24:22
[INFO] [stdout]    |
[INFO] [stdout] 24 |                 Some(mut token) => {
[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/parser.rs:56:17
[INFO] [stdout]    |
[INFO] [stdout] 56 |             let mut text = self.tokens[i].get_text();
[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/parser.rs:204:49
[INFO] [stdout]     |
[INFO] [stdout] 204 |     pub fn check_function_definition(&mut self, mut pos: usize) -> Option<usize> {
[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/parser.rs:801:13
[INFO] [stdout]     |
[INFO] [stdout] 801 |         let mut last_pos = pos;
[INFO] [stdout]     |             ----^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `from_str`
[INFO] [stdout]   --> src/character_stream.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn from_str(s: &str) -> CharStream {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `more_available`
[INFO] [stdout]   --> src/character_stream.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 |     pub fn more_available(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `NONE`
[INFO] [stdout]  --> src/token.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     NONE,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: `TokenType` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]  --> src/token.rs:1:10
[INFO] [stdout]   |
[INFO] [stdout] 1 | #[derive(Debug)]
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout]   = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `as_str`
[INFO] [stdout]   --> src/token.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     pub fn as_str(&self) -> &'static str {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 34 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.62s
[INFO] running `Command { std: "docker" "inspect" "4d8f5239fcc471f12ddabdb2550fb1bf421b7fa4fbb083995f984e08f56b01fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4d8f5239fcc471f12ddabdb2550fb1bf421b7fa4fbb083995f984e08f56b01fa", kill_on_drop: false }`
[INFO] [stdout] 4d8f5239fcc471f12ddabdb2550fb1bf421b7fa4fbb083995f984e08f56b01fa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 452a577e44b11e747e05d1d71c4473eaab9c6e5ccc92a70953569a3f4024b814
[INFO] running `Command { std: "docker" "start" "-a" "452a577e44b11e747e05d1d71c4473eaab9c6e5ccc92a70953569a3f4024b814", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/character_stream.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::convert::TryFrom`
[INFO] [stderr]  --> src/character_stream.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::convert::TryFrom;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:151:9
[INFO] [stderr]     |
[INFO] [stderr] 127 | /         match self.check_declaration_type(pos) {
[INFO] [stderr] 128 | |             Some(next_pos) => {
[INFO] [stderr] 129 | |                 pos = next_pos;
[INFO] [stderr] 130 | |                 match self.check_variable_declaration(pos) {
[INFO] [stderr] ...   |
[INFO] [stderr] 149 | |             _ => { return None; }
[INFO] [stderr] 150 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 151 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:201:9
[INFO] [stderr]     |
[INFO] [stderr] 155 | /         match self.tokens.get(pos) {
[INFO] [stderr] 156 | |             Some(token) => {
[INFO] [stderr] 157 | |                 if token.get_text() == "void" {
[INFO] [stderr] 158 | |                     pos += 1;
[INFO] [stderr] ...   |
[INFO] [stderr] 199 | |             _ => { return None; }
[INFO] [stderr] 200 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 201 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:223:9
[INFO] [stderr]     |
[INFO] [stderr] 205 | /         match self.check_declaration_type(pos) {
[INFO] [stderr] 206 | |             Some(next_pos) => {
[INFO] [stderr] 207 | |                 match self.check_parameter_block(next_pos) {
[INFO] [stderr] 208 | |                     Some(next_pos2) => {
[INFO] [stderr] ...   |
[INFO] [stderr] 221 | |             _ => { return None; }
[INFO] [stderr] 222 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 223 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:244:9
[INFO] [stderr]     |
[INFO] [stderr] 227 | /         match self.check_data_type(pos) {
[INFO] [stderr] 228 | |             Some(next_pos) => {
[INFO] [stderr] 229 | |                 pos = next_pos;
[INFO] [stderr] 230 | |                 match self.tokens.get(pos) {
[INFO] [stderr] ...   |
[INFO] [stderr] 242 | |             _ => { return None; }
[INFO] [stderr] 243 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 244 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:273:9
[INFO] [stderr]     |
[INFO] [stderr] 248 | /         match self.tokens.get(pos) {
[INFO] [stderr] 249 | |             Some(token) => {
[INFO] [stderr] 250 | |                 if token.get_text() == "=" {
[INFO] [stderr] 251 | |                     pos += 1;
[INFO] [stderr] ...   |
[INFO] [stderr] 271 | |             _ => { return None; }
[INFO] [stderr] 272 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 273 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:294:9
[INFO] [stderr]     |
[INFO] [stderr] 277 | /         match self.check_parameter_block(pos) {
[INFO] [stderr] 278 | |             Some(next_pos) => {
[INFO] [stderr] 279 | |                 pos = next_pos;
[INFO] [stderr] 280 | |                 match self.tokens.get(pos) {
[INFO] [stderr] ...   |
[INFO] [stderr] 292 | |             _ => { return None; }
[INFO] [stderr] 293 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 294 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:337:9
[INFO] [stderr]     |
[INFO] [stderr] 298 | /         match self.tokens.get(pos) {
[INFO] [stderr] 299 | |             Some(token) => {
[INFO] [stderr] 300 | |                 if token.get_text() == "{" {
[INFO] [stderr] 301 | |                     pos += 1;
[INFO] [stderr] ...   |
[INFO] [stderr] 335 | |             _ => { return None; }
[INFO] [stderr] 336 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 337 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:392:9
[INFO] [stderr]     |
[INFO] [stderr] 343 | /         match self.tokens.get(pos) {
[INFO] [stderr] 344 | |             Some(token) => {
[INFO] [stderr] 345 | |                 if token.get_text() == "(" { //是不是 （
[INFO] [stderr] 346 | |                     pos += 1;
[INFO] [stderr] ...   |
[INFO] [stderr] 390 | |             _ => { return None; }
[INFO] [stderr] 391 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 392 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:419:9
[INFO] [stderr]     |
[INFO] [stderr] 408 | /         match self.tokens.get(pos) {
[INFO] [stderr] 409 | |             Some(token) => {
[INFO] [stderr] 410 | |                 if token.is_constant() {
[INFO] [stderr] 411 | |                     pos += 1;
[INFO] [stderr] ...   |
[INFO] [stderr] 417 | |             _ => { return None; }
[INFO] [stderr] 418 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 419 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:475:9
[INFO] [stderr]     |
[INFO] [stderr] 458 | /         match self.check_data_type(pos) {
[INFO] [stderr] 459 | |             Some(next_pos) => {
[INFO] [stderr] 460 | |                 pos = next_pos;
[INFO] [stderr] 461 | |                 match self.tokens.get(pos) {
[INFO] [stderr] ...   |
[INFO] [stderr] 473 | |             _ => { return None; }
[INFO] [stderr] 474 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 475 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:499:9
[INFO] [stderr]     |
[INFO] [stderr] 487 | /         match self.tokens.get(pos) {
[INFO] [stderr] 488 | |             Some(token) => {
[INFO] [stderr] 489 | |                 match token.get_text() {
[INFO] [stderr] 490 | |                     "char" | "short" | "int" | "long" => {
[INFO] [stderr] ...   |
[INFO] [stderr] 497 | |             _ => { return None; }
[INFO] [stderr] 498 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 499 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:575:9
[INFO] [stderr]     |
[INFO] [stderr] 519 | /         match self.tokens.get(pos) {
[INFO] [stderr] 520 | |             Some(token) => {
[INFO] [stderr] 521 | |                 if token.is_identifier() {
[INFO] [stderr] 522 | |                     pos += 1;
[INFO] [stderr] ...   |
[INFO] [stderr] 573 | |             _ => { return None; }
[INFO] [stderr] 574 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 575 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:621:9
[INFO] [stderr]     |
[INFO] [stderr] 579 | /         match self.tokens.get(pos) {
[INFO] [stderr] 580 | |             Some(token) => {
[INFO] [stderr] 581 | |                 if token.get_text() == "while" {
[INFO] [stderr] 582 | |                     pos += 1;
[INFO] [stderr] ...   |
[INFO] [stderr] 619 | |             _ => { return None; }
[INFO] [stderr] 620 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 621 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:667:9
[INFO] [stderr]     |
[INFO] [stderr] 625 | /         match self.tokens.get(pos) {
[INFO] [stderr] 626 | |             Some(token) => {
[INFO] [stderr] 627 | |                 if token.get_text() == "if" {
[INFO] [stderr] 628 | |                     pos += 1;
[INFO] [stderr] ...   |
[INFO] [stderr] 665 | |             _ => { return None; }
[INFO] [stderr] 666 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 667 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:698:9
[INFO] [stderr]     |
[INFO] [stderr] 671 | /         match self.tokens.get(pos) {
[INFO] [stderr] 672 | |             Some(token) => {
[INFO] [stderr] 673 | |                 if token.get_text() == "return" {
[INFO] [stderr] 674 | |                     pos += 1;
[INFO] [stderr] ...   |
[INFO] [stderr] 696 | |             _ => { return None; }
[INFO] [stderr] 697 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 698 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:719:9
[INFO] [stderr]     |
[INFO] [stderr] 702 | /         match self.check_simple_expression(pos) {
[INFO] [stderr] 703 | |             Some(next_pos) => {
[INFO] [stderr] 704 | |                 pos = next_pos;
[INFO] [stderr] 705 | |                 match self.check_relation_operator(pos) {
[INFO] [stderr] ...   |
[INFO] [stderr] 717 | |             _ => { return None; }
[INFO] [stderr] 718 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 719 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:742:9
[INFO] [stderr]     |
[INFO] [stderr] 723 | /         match self.check_term(pos) {
[INFO] [stderr] 724 | |             Some(next_pos) => {
[INFO] [stderr] 725 | |                 pos = next_pos;
[INFO] [stderr] 726 | |                 loop {
[INFO] [stderr] ...   |
[INFO] [stderr] 740 | |             _ => { return None; }
[INFO] [stderr] 741 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 742 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:765:9
[INFO] [stderr]     |
[INFO] [stderr] 746 | /         match self.check_factor(pos) {
[INFO] [stderr] 747 | |             Some(next_pos) => {
[INFO] [stderr] 748 | |                 pos = next_pos;
[INFO] [stderr] 749 | |                 loop {
[INFO] [stderr] ...   |
[INFO] [stderr] 763 | |             _ => { return None; }
[INFO] [stderr] 764 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 765 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:869:9
[INFO] [stderr]     |
[INFO] [stderr] 857 | /         match self.tokens.get(pos) {
[INFO] [stderr] 858 | |             Some(token) => {
[INFO] [stderr] 859 | |                 match token.get_text() {
[INFO] [stderr] 860 | |                     "==" | "<" | ">" | "<=" | ">=" | "!=" => { 
[INFO] [stderr] ...   |
[INFO] [stderr] 867 | |             _ => { return None; }
[INFO] [stderr] 868 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 869 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:885:9
[INFO] [stderr]     |
[INFO] [stderr] 873 | /         match self.tokens.get(pos) {
[INFO] [stderr] 874 | |             Some(token) => {
[INFO] [stderr] 875 | |                 match token.get_text() {
[INFO] [stderr] 876 | |                     "+" | "-" => { 
[INFO] [stderr] ...   |
[INFO] [stderr] 883 | |             _ => { return None; }
[INFO] [stderr] 884 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 885 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/parser.rs:901:9
[INFO] [stderr]     |
[INFO] [stderr] 889 | /         match self.tokens.get(pos) {
[INFO] [stderr] 890 | |             Some(token) => {
[INFO] [stderr] 891 | |                 match token.get_text() {
[INFO] [stderr] 892 | |                     "*" | "/" => {
[INFO] [stderr] ...   |
[INFO] [stderr] 899 | |             _ => { return None; }
[INFO] [stderr] 900 | |         }
[INFO] [stderr]     | |_________- any code following this `match` expression is unreachable, as all arms diverge
[INFO] [stderr] 901 |           None
[INFO] [stderr]     |           ^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/parser.rs:35:18
[INFO] [stderr]    |
[INFO] [stderr] 35 |             Some(x) => {
[INFO] [stderr]    |                  ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `space_num` is never read
[INFO] [stderr]   --> src/parser.rs:52:17
[INFO] [stderr]    |
[INFO] [stderr] 52 |         let mut space_num = 0;
[INFO] [stderr]    |                 ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `j`
[INFO] [stderr]   --> src/parser.rs:99:21
[INFO] [stderr]    |
[INFO] [stderr] 99 |                 for j in 0..space_num {
[INFO] [stderr]    |                     ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/parser.rs:24:22
[INFO] [stderr]    |
[INFO] [stderr] 24 |                 Some(mut token) => {
[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/parser.rs:56:17
[INFO] [stderr]    |
[INFO] [stderr] 56 |             let mut text = self.tokens[i].get_text();
[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/parser.rs:204:49
[INFO] [stderr]     |
[INFO] [stderr] 204 |     pub fn check_function_definition(&mut self, mut pos: usize) -> Option<usize> {
[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/parser.rs:801:13
[INFO] [stderr]     |
[INFO] [stderr] 801 |         let mut last_pos = pos;
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `from_str`
[INFO] [stderr]   --> src/character_stream.rs:28:12
[INFO] [stderr]    |
[INFO] [stderr] 28 |     pub fn from_str(s: &str) -> CharStream {
[INFO] [stderr]    |            ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `more_available`
[INFO] [stderr]   --> src/character_stream.rs:37:12
[INFO] [stderr]    |
[INFO] [stderr] 37 |     pub fn more_available(&self) -> bool {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `NONE`
[INFO] [stderr]  --> src/token.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     NONE,
[INFO] [stderr]   |     ^^^^
[INFO] [stderr]   |
[INFO] [stderr] note: `TokenType` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]  --> src/token.rs:1:10
[INFO] [stderr]   |
[INFO] [stderr] 1 | #[derive(Debug)]
[INFO] [stderr]   |          ^^^^^
[INFO] [stderr]   = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `as_str`
[INFO] [stderr]   --> src/token.rs:14:12
[INFO] [stderr]    |
[INFO] [stderr] 14 |     pub fn as_str(&self) -> &'static str {
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `parser` (bin "parser" test) generated 34 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.38s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/parser-c4a0a76a383a6810)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "452a577e44b11e747e05d1d71c4473eaab9c6e5ccc92a70953569a3f4024b814", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "452a577e44b11e747e05d1d71c4473eaab9c6e5ccc92a70953569a3f4024b814", kill_on_drop: false }`
[INFO] [stdout] 452a577e44b11e747e05d1d71c4473eaab9c6e5ccc92a70953569a3f4024b814