Dec 19 11:12:23.648 INFO checking patallen/SlangVM against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955 Dec 19 11:12:23.648 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-7/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/patallen/SlangVM:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"` Dec 19 11:12:24.070 INFO [stdout] 64d0c556adf6530625df039ae3f00bd32bef82188983369a1af475c097936c11 Dec 19 11:12:24.075 INFO running `"docker" "start" "-a" "64d0c556adf6530625df039ae3f00bd32bef82188983369a1af475c097936c11"` Dec 19 11:12:26.035 INFO [stderr] Compiling gcc v0.3.46 Dec 19 11:12:26.035 INFO [stderr] Checking quick-error v1.2.0 Dec 19 11:12:26.056 INFO [stderr] Checking thread-id v3.1.0 Dec 19 11:12:26.057 INFO [stderr] Checking serde_json v1.0.2 Dec 19 11:12:26.072 INFO [stderr] Checking ordered-float v0.4.0 Dec 19 11:12:26.072 INFO [stderr] Checking serde_yaml v0.7.0 Dec 19 11:12:26.073 INFO [stderr] Checking typemap v0.3.3 Dec 19 11:12:26.084 INFO [stderr] Compiling serde_derive_internals v0.15.0 Dec 19 11:12:27.090 INFO [stderr] Checking thread_local v0.3.3 Dec 19 11:12:27.258 INFO [stderr] Checking humantime v1.0.0 Dec 19 11:12:28.507 INFO [stderr] Checking serde-value v0.5.0 Dec 19 11:12:28.824 INFO [stderr] Checking regex v0.2.1 Dec 19 11:12:34.892 INFO [stderr] Compiling miniz-sys v0.1.9 Dec 19 11:12:35.784 INFO [stderr] Compiling serde_derive v1.0.4 Dec 19 11:12:37.520 INFO [stderr] Checking flate2 v0.2.19 Dec 19 11:12:42.996 INFO [stderr] Checking log4rs v0.7.0 Dec 19 11:12:44.912 INFO [stderr] Checking slang v0.1.0 (/opt/crater/workdir) Dec 19 11:12:46.200 INFO [stderr] warning: unused import: `assembler::lexer::Lexer` Dec 19 11:12:46.200 INFO [stderr] --> src/main.rs:23:5 Dec 19 11:12:46.200 INFO [stderr] | Dec 19 11:12:46.200 INFO [stderr] 23 | use assembler::lexer::Lexer; Dec 19 11:12:46.200 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.200 INFO [stderr] | Dec 19 11:12:46.200 INFO [stderr] = note: #[warn(unused_imports)] on by default Dec 19 11:12:46.200 INFO [stderr] Dec 19 11:12:46.200 INFO [stderr] warning: unused imports: `Tokenizer`, `shunting_yard` Dec 19 11:12:46.200 INFO [stderr] --> src/main.rs:24:21 Dec 19 11:12:46.200 INFO [stderr] | Dec 19 11:12:46.200 INFO [stderr] 24 | use compiler::lex::{Tokenizer, shunting_yard}; Dec 19 11:12:46.200 INFO [stderr] | ^^^^^^^^^ ^^^^^^^^^^^^^ Dec 19 11:12:46.201 INFO [stderr] Dec 19 11:12:46.244 INFO [stderr] warning: unused import: `assembler::lexer::Lexer` Dec 19 11:12:46.245 INFO [stderr] --> src/main.rs:23:5 Dec 19 11:12:46.245 INFO [stderr] | Dec 19 11:12:46.245 INFO [stderr] 23 | use assembler::lexer::Lexer; Dec 19 11:12:46.245 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.245 INFO [stderr] | Dec 19 11:12:46.245 INFO [stderr] = note: #[warn(unused_imports)] on by default Dec 19 11:12:46.245 INFO [stderr] Dec 19 11:12:46.253 INFO [stderr] warning: unused imports: `Tokenizer`, `shunting_yard` Dec 19 11:12:46.253 INFO [stderr] --> src/main.rs:24:21 Dec 19 11:12:46.253 INFO [stderr] | Dec 19 11:12:46.253 INFO [stderr] 24 | use compiler::lex::{Tokenizer, shunting_yard}; Dec 19 11:12:46.253 INFO [stderr] | ^^^^^^^^^ ^^^^^^^^^^^^^ Dec 19 11:12:46.253 INFO [stderr] Dec 19 11:12:46.546 INFO [stderr] warning: use of deprecated item 'core::str::::trim_left_matches': superseded by `trim_start_matches` Dec 19 11:12:46.547 INFO [stderr] --> src/assembler/lexer.rs:72:30 Dec 19 11:12:46.547 INFO [stderr] | Dec 19 11:12:46.547 INFO [stderr] 72 | let ret = string.trim_left_matches(';').trim_left(); Dec 19 11:12:46.547 INFO [stderr] | ^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.548 INFO [stderr] | Dec 19 11:12:46.548 INFO [stderr] = note: #[warn(deprecated)] on by default Dec 19 11:12:46.548 INFO [stderr] Dec 19 11:12:46.549 INFO [stderr] warning: use of deprecated item 'core::str::::trim_left': superseded by `trim_start` Dec 19 11:12:46.550 INFO [stderr] --> src/assembler/lexer.rs:72:53 Dec 19 11:12:46.550 INFO [stderr] | Dec 19 11:12:46.550 INFO [stderr] 72 | let ret = string.trim_left_matches(';').trim_left(); Dec 19 11:12:46.550 INFO [stderr] | ^^^^^^^^^ Dec 19 11:12:46.551 INFO [stderr] Dec 19 11:12:46.713 INFO [stderr] warning: use of deprecated item 'core::str::::trim_left_matches': superseded by `trim_start_matches` Dec 19 11:12:46.713 INFO [stderr] --> src/assembler/lexer.rs:72:30 Dec 19 11:12:46.713 INFO [stderr] | Dec 19 11:12:46.714 INFO [stderr] 72 | let ret = string.trim_left_matches(';').trim_left(); Dec 19 11:12:46.714 INFO [stderr] | ^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.714 INFO [stderr] | Dec 19 11:12:46.714 INFO [stderr] = note: #[warn(deprecated)] on by default Dec 19 11:12:46.714 INFO [stderr] Dec 19 11:12:46.714 INFO [stderr] warning: use of deprecated item 'core::str::::trim_left': superseded by `trim_start` Dec 19 11:12:46.714 INFO [stderr] --> src/assembler/lexer.rs:72:53 Dec 19 11:12:46.714 INFO [stderr] | Dec 19 11:12:46.714 INFO [stderr] 72 | let ret = string.trim_left_matches(';').trim_left(); Dec 19 11:12:46.714 INFO [stderr] | ^^^^^^^^^ Dec 19 11:12:46.714 INFO [stderr] Dec 19 11:12:46.768 INFO [stderr] warning: method is never used: `next_code` Dec 19 11:12:46.768 INFO [stderr] --> src/program.rs:28:5 Dec 19 11:12:46.768 INFO [stderr] | Dec 19 11:12:46.768 INFO [stderr] 28 | pub fn next_code(&mut self) -> u16 { Dec 19 11:12:46.768 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.768 INFO [stderr] | Dec 19 11:12:46.769 INFO [stderr] = note: #[warn(dead_code)] on by default Dec 19 11:12:46.769 INFO [stderr] Dec 19 11:12:46.769 INFO [stderr] warning: method is never used: `reset` Dec 19 11:12:46.769 INFO [stderr] --> src/program.rs:41:5 Dec 19 11:12:46.769 INFO [stderr] | Dec 19 11:12:46.769 INFO [stderr] 41 | pub fn reset(&mut self) { Dec 19 11:12:46.769 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.769 INFO [stderr] Dec 19 11:12:46.769 INFO [stderr] warning: enum is never used: `Token` Dec 19 11:12:46.769 INFO [stderr] --> src/compiler/lex.rs:7:1 Dec 19 11:12:46.769 INFO [stderr] | Dec 19 11:12:46.769 INFO [stderr] 7 | pub enum Token { Dec 19 11:12:46.769 INFO [stderr] | ^^^^^^^^^^^^^^ Dec 19 11:12:46.769 INFO [stderr] Dec 19 11:12:46.769 INFO [stderr] warning: enum is never used: `ConsumeType` Dec 19 11:12:46.769 INFO [stderr] --> src/compiler/lex.rs:15:1 Dec 19 11:12:46.769 INFO [stderr] | Dec 19 11:12:46.769 INFO [stderr] 15 | enum ConsumeType { Ident, Number } Dec 19 11:12:46.770 INFO [stderr] | ^^^^^^^^^^^^^^^^ Dec 19 11:12:46.770 INFO [stderr] Dec 19 11:12:46.770 INFO [stderr] warning: struct is never constructed: `Tokenizer` Dec 19 11:12:46.770 INFO [stderr] --> src/compiler/lex.rs:17:1 Dec 19 11:12:46.770 INFO [stderr] | Dec 19 11:12:46.770 INFO [stderr] 17 | pub struct Tokenizer<'a> { Dec 19 11:12:46.770 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.770 INFO [stderr] Dec 19 11:12:46.770 INFO [stderr] warning: method is never used: `new` Dec 19 11:12:46.770 INFO [stderr] --> src/compiler/lex.rs:21:5 Dec 19 11:12:46.770 INFO [stderr] | Dec 19 11:12:46.770 INFO [stderr] 21 | pub fn new(input: &'a str) -> Self { Dec 19 11:12:46.770 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.770 INFO [stderr] Dec 19 11:12:46.770 INFO [stderr] warning: method is never used: `tokenize` Dec 19 11:12:46.770 INFO [stderr] --> src/compiler/lex.rs:26:5 Dec 19 11:12:46.770 INFO [stderr] | Dec 19 11:12:46.770 INFO [stderr] 26 | pub fn tokenize(&mut self) -> Vec { Dec 19 11:12:46.770 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.770 INFO [stderr] Dec 19 11:12:46.771 INFO [stderr] warning: function is never used: `consume_ident` Dec 19 11:12:46.771 INFO [stderr] --> src/compiler/lex.rs:48:1 Dec 19 11:12:46.771 INFO [stderr] | Dec 19 11:12:46.771 INFO [stderr] 48 | fn consume_ident(peekable: &mut Peekable) -> Token { Dec 19 11:12:46.771 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.771 INFO [stderr] Dec 19 11:12:46.771 INFO [stderr] warning: function is never used: `consume_number` Dec 19 11:12:46.771 INFO [stderr] --> src/compiler/lex.rs:53:1 Dec 19 11:12:46.771 INFO [stderr] | Dec 19 11:12:46.771 INFO [stderr] 53 | fn consume_number(peekable: &mut Peekable) -> Token { Dec 19 11:12:46.771 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.771 INFO [stderr] Dec 19 11:12:46.771 INFO [stderr] warning: function is never used: `valid_token_char` Dec 19 11:12:46.771 INFO [stderr] --> src/compiler/lex.rs:58:1 Dec 19 11:12:46.771 INFO [stderr] | Dec 19 11:12:46.771 INFO [stderr] 58 | fn valid_token_char(ch: &char, tt: ConsumeType) -> bool { Dec 19 11:12:46.771 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.771 INFO [stderr] Dec 19 11:12:46.771 INFO [stderr] warning: function is never used: `shunting_yard` Dec 19 11:12:46.771 INFO [stderr] --> src/compiler/lex.rs:71:1 Dec 19 11:12:46.772 INFO [stderr] | Dec 19 11:12:46.772 INFO [stderr] 71 | pub fn shunting_yard(tokens: Vec) -> Vec { Dec 19 11:12:46.772 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.772 INFO [stderr] Dec 19 11:12:46.772 INFO [stderr] warning: field is never used: `current_line` Dec 19 11:12:46.772 INFO [stderr] --> src/assembler/mod.rs:12:5 Dec 19 11:12:46.772 INFO [stderr] | Dec 19 11:12:46.772 INFO [stderr] 12 | current_line: usize, Dec 19 11:12:46.772 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.772 INFO [stderr] Dec 19 11:12:46.772 INFO [stderr] warning: field is never used: `errors` Dec 19 11:12:46.772 INFO [stderr] --> src/assembler/mod.rs:13:5 Dec 19 11:12:46.772 INFO [stderr] | Dec 19 11:12:46.772 INFO [stderr] 13 | errors: Vec, Dec 19 11:12:46.772 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.772 INFO [stderr] Dec 19 11:12:46.775 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used Dec 19 11:12:46.775 INFO [stderr] --> src/compiler/lex.rs:38:73 Dec 19 11:12:46.775 INFO [stderr] | Dec 19 11:12:46.775 INFO [stderr] 38 | ')' => {tokens.push(Token::RightParen); chars.take(1).collect::();}, Dec 19 11:12:46.775 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.775 INFO [stderr] | Dec 19 11:12:46.775 INFO [stderr] = note: #[warn(unused_must_use)] on by default Dec 19 11:12:46.775 INFO [stderr] = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead Dec 19 11:12:46.775 INFO [stderr] Dec 19 11:12:46.775 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used Dec 19 11:12:46.775 INFO [stderr] --> src/compiler/lex.rs:39:72 Dec 19 11:12:46.775 INFO [stderr] | Dec 19 11:12:46.775 INFO [stderr] 39 | '(' => {tokens.push(Token::LeftParen); chars.take(1).collect::();}, Dec 19 11:12:46.776 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.776 INFO [stderr] | Dec 19 11:12:46.776 INFO [stderr] = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead Dec 19 11:12:46.776 INFO [stderr] Dec 19 11:12:46.776 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used Dec 19 11:12:46.776 INFO [stderr] --> src/compiler/lex.rs:40:42 Dec 19 11:12:46.776 INFO [stderr] | Dec 19 11:12:46.776 INFO [stderr] 40 | ' ' => { chars.take(1).collect::(); } Dec 19 11:12:46.777 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.777 INFO [stderr] | Dec 19 11:12:46.777 INFO [stderr] = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead Dec 19 11:12:46.777 INFO [stderr] Dec 19 11:12:46.968 INFO [stderr] warning: enum is never used: `Token` Dec 19 11:12:46.968 INFO [stderr] --> src/compiler/lex.rs:7:1 Dec 19 11:12:46.968 INFO [stderr] | Dec 19 11:12:46.968 INFO [stderr] 7 | pub enum Token { Dec 19 11:12:46.968 INFO [stderr] | ^^^^^^^^^^^^^^ Dec 19 11:12:46.968 INFO [stderr] | Dec 19 11:12:46.968 INFO [stderr] = note: #[warn(dead_code)] on by default Dec 19 11:12:46.968 INFO [stderr] Dec 19 11:12:46.968 INFO [stderr] warning: enum is never used: `ConsumeType` Dec 19 11:12:46.968 INFO [stderr] --> src/compiler/lex.rs:15:1 Dec 19 11:12:46.968 INFO [stderr] | Dec 19 11:12:46.968 INFO [stderr] 15 | enum ConsumeType { Ident, Number } Dec 19 11:12:46.968 INFO [stderr] | ^^^^^^^^^^^^^^^^ Dec 19 11:12:46.968 INFO [stderr] Dec 19 11:12:46.968 INFO [stderr] warning: struct is never constructed: `Tokenizer` Dec 19 11:12:46.968 INFO [stderr] --> src/compiler/lex.rs:17:1 Dec 19 11:12:46.968 INFO [stderr] | Dec 19 11:12:46.968 INFO [stderr] 17 | pub struct Tokenizer<'a> { Dec 19 11:12:46.968 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.968 INFO [stderr] Dec 19 11:12:46.968 INFO [stderr] warning: method is never used: `new` Dec 19 11:12:46.968 INFO [stderr] --> src/compiler/lex.rs:21:5 Dec 19 11:12:46.968 INFO [stderr] | Dec 19 11:12:46.968 INFO [stderr] 21 | pub fn new(input: &'a str) -> Self { Dec 19 11:12:46.968 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.968 INFO [stderr] Dec 19 11:12:46.968 INFO [stderr] warning: method is never used: `tokenize` Dec 19 11:12:46.968 INFO [stderr] --> src/compiler/lex.rs:26:5 Dec 19 11:12:46.968 INFO [stderr] | Dec 19 11:12:46.969 INFO [stderr] 26 | pub fn tokenize(&mut self) -> Vec { Dec 19 11:12:46.969 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.969 INFO [stderr] Dec 19 11:12:46.969 INFO [stderr] warning: function is never used: `consume_ident` Dec 19 11:12:46.969 INFO [stderr] --> src/compiler/lex.rs:48:1 Dec 19 11:12:46.969 INFO [stderr] | Dec 19 11:12:46.969 INFO [stderr] 48 | fn consume_ident(peekable: &mut Peekable) -> Token { Dec 19 11:12:46.969 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.969 INFO [stderr] Dec 19 11:12:46.969 INFO [stderr] warning: function is never used: `consume_number` Dec 19 11:12:46.969 INFO [stderr] --> src/compiler/lex.rs:53:1 Dec 19 11:12:46.969 INFO [stderr] | Dec 19 11:12:46.969 INFO [stderr] 53 | fn consume_number(peekable: &mut Peekable) -> Token { Dec 19 11:12:46.969 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.969 INFO [stderr] Dec 19 11:12:46.969 INFO [stderr] warning: function is never used: `valid_token_char` Dec 19 11:12:46.969 INFO [stderr] --> src/compiler/lex.rs:58:1 Dec 19 11:12:46.969 INFO [stderr] | Dec 19 11:12:46.969 INFO [stderr] 58 | fn valid_token_char(ch: &char, tt: ConsumeType) -> bool { Dec 19 11:12:46.969 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.969 INFO [stderr] Dec 19 11:12:46.969 INFO [stderr] warning: function is never used: `shunting_yard` Dec 19 11:12:46.969 INFO [stderr] --> src/compiler/lex.rs:71:1 Dec 19 11:12:46.969 INFO [stderr] | Dec 19 11:12:46.969 INFO [stderr] 71 | pub fn shunting_yard(tokens: Vec) -> Vec { Dec 19 11:12:46.969 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.969 INFO [stderr] Dec 19 11:12:46.969 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used Dec 19 11:12:46.969 INFO [stderr] --> src/compiler/lex.rs:38:73 Dec 19 11:12:46.969 INFO [stderr] | Dec 19 11:12:46.969 INFO [stderr] 38 | ')' => {tokens.push(Token::RightParen); chars.take(1).collect::();}, Dec 19 11:12:46.969 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.969 INFO [stderr] | Dec 19 11:12:46.969 INFO [stderr] = note: #[warn(unused_must_use)] on by default Dec 19 11:12:46.976 INFO [stderr] = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead Dec 19 11:12:46.976 INFO [stderr] Dec 19 11:12:46.976 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used Dec 19 11:12:46.976 INFO [stderr] --> src/compiler/lex.rs:39:72 Dec 19 11:12:46.976 INFO [stderr] | Dec 19 11:12:46.976 INFO [stderr] 39 | '(' => {tokens.push(Token::LeftParen); chars.take(1).collect::();}, Dec 19 11:12:46.976 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.976 INFO [stderr] | Dec 19 11:12:46.976 INFO [stderr] = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead Dec 19 11:12:46.976 INFO [stderr] Dec 19 11:12:46.976 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used Dec 19 11:12:46.976 INFO [stderr] --> src/compiler/lex.rs:40:42 Dec 19 11:12:46.976 INFO [stderr] | Dec 19 11:12:46.976 INFO [stderr] 40 | ' ' => { chars.take(1).collect::(); } Dec 19 11:12:46.976 INFO [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dec 19 11:12:46.976 INFO [stderr] | Dec 19 11:12:46.976 INFO [stderr] = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead Dec 19 11:12:46.976 INFO [stderr] Dec 19 11:12:47.004 INFO [stderr] Finished dev [unoptimized + debuginfo] target(s) in 21.11s Dec 19 11:12:47.848 INFO running `"docker" "inspect" "64d0c556adf6530625df039ae3f00bd32bef82188983369a1af475c097936c11"` Dec 19 11:12:48.224 INFO running `"docker" "rm" "-f" "64d0c556adf6530625df039ae3f00bd32bef82188983369a1af475c097936c11"` Dec 19 11:12:48.542 INFO [stdout] 64d0c556adf6530625df039ae3f00bd32bef82188983369a1af475c097936c11