[INFO] cloning repository https://github.com/EmmaLa/MonkeyInterpreter
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/EmmaLa/MonkeyInterpreter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEmmaLa%2FMonkeyInterpreter"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEmmaLa%2FMonkeyInterpreter'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 538fab97895b45c362be501f897eecf95811dcf0
[INFO] testing EmmaLa/MonkeyInterpreter against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEmmaLa%2FMonkeyInterpreter" "/workspace/builds/worker-6/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/EmmaLa/MonkeyInterpreter on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/EmmaLa/MonkeyInterpreter
[INFO] finished tweaking git repo https://github.com/EmmaLa/MonkeyInterpreter
[INFO] tweaked toml for git repo https://github.com/EmmaLa/MonkeyInterpreter written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/EmmaLa/MonkeyInterpreter already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] fc7268e01760ede36d182e5a5430028530a8c4247673a1a34170cf9a45bd473b
[INFO] running `"docker" "start" "-a" "fc7268e01760ede36d182e5a5430028530a8c4247673a1a34170cf9a45bd473b"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling monkey_int v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `ast::Statement::*`
[INFO] [stderr]    --> src/parser/mod.rs:155:7
[INFO] [stderr]     |
[INFO] [stderr] 155 |         use ast::Statement::*;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `repl::Repl`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use repl::Repl;
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fs::File`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::fs::File;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Read`
[INFO] [stderr]  --> src/main.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use std::io::Read;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::iter::Peekable`
[INFO] [stderr]   --> src/main.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use std::iter::Peekable;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `lexer::token::Token::*`
[INFO] [stderr]   --> src/main.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 | use lexer::token::Token::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]   --> src/repl/mod.rs:26:10
[INFO] [stderr]    |
[INFO] [stderr] 26 |             Ok(n) => buffer,
[INFO] [stderr]    |                ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `error`
[INFO] [stderr]   --> src/repl/mod.rs:27:11
[INFO] [stderr]    |
[INFO] [stderr] 27 |             Err(error) => {
[INFO] [stderr]    |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_error`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let mut content = String::from("-4+2;");
[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: function is never used: `is_equal_sign`
[INFO] [stderr]   --> src/lexer/reader.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn is_equal_sign(character: &char) -> bool {
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `read_identifier`
[INFO] [stderr]   --> src/lexer/reader.rs:69:2
[INFO] [stderr]    |
[INFO] [stderr] 69 |     pub fn read_identifier(&mut self, character: char) -> Option<Token> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `is_letter`
[INFO] [stderr]   --> src/lexer/mod.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn is_letter(character: &char) -> bool {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `run`
[INFO] [stderr]  --> src/repl/mod.rs:9:2
[INFO] [stderr]   |
[INFO] [stderr] 9 |     pub fn run(){
[INFO] [stderr]   |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `read_user_input`
[INFO] [stderr]   --> src/repl/mod.rs:23:2
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn read_user_input(&mut self) -> String {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Expression`
[INFO] [stderr]   --> src/ast/mod.rs:51:2
[INFO] [stderr]    |
[INFO] [stderr] 51 |       Expression {
[INFO] [stderr]    |  _____^
[INFO] [stderr] 52 | |         token: Token,
[INFO] [stderr] 53 | |         value: Box<Statement>
[INFO] [stderr] 54 | |     },
[INFO] [stderr]    | |_____^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Call`
[INFO] [stderr]   --> src/parser/mod.rs:15:2
[INFO] [stderr]    |
[INFO] [stderr] 15 |     Call = 7
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `next_token_is_int`
[INFO] [stderr]    --> src/parser/mod.rs:236:2
[INFO] [stderr]     |
[INFO] [stderr] 236 |     fn next_token_is_int(&mut self) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable `PROMPT` should have a snake case name
[INFO] [stderr]   --> src/repl/mod.rs:11:7
[INFO] [stderr]    |
[INFO] [stderr] 11 |         let PROMPT = ">> ";
[INFO] [stderr]    |             ^^^^^^ help: convert the identifier to snake case: `prompt`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/repl/mod.rs:14:4
[INFO] [stderr]    |
[INFO] [stderr] 14 |             io::stdout().flush();
[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: 19 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.31s
[INFO] running `"docker" "inspect" "fc7268e01760ede36d182e5a5430028530a8c4247673a1a34170cf9a45bd473b"`
[INFO] running `"docker" "rm" "-f" "fc7268e01760ede36d182e5a5430028530a8c4247673a1a34170cf9a45bd473b"`
[INFO] [stdout] fc7268e01760ede36d182e5a5430028530a8c4247673a1a34170cf9a45bd473b
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] a99cf2b1dfa7564ee2f7fe0d03b4277b489a6996c5d6409f1afa3db3e6686147
[INFO] running `"docker" "start" "-a" "a99cf2b1dfa7564ee2f7fe0d03b4277b489a6996c5d6409f1afa3db3e6686147"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling monkey_int v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `ast::Statement::*`
[INFO] [stderr]    --> src/parser/mod.rs:155:7
[INFO] [stderr]     |
[INFO] [stderr] 155 |         use ast::Statement::*;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `repl::Repl`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use repl::Repl;
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fs::File`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::fs::File;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Read`
[INFO] [stderr]  --> src/main.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use std::io::Read;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::iter::Peekable`
[INFO] [stderr]   --> src/main.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use std::iter::Peekable;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `lexer::token::Token::*`
[INFO] [stderr]   --> src/main.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 | use lexer::token::Token::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]   --> src/repl/mod.rs:26:10
[INFO] [stderr]    |
[INFO] [stderr] 26 |             Ok(n) => buffer,
[INFO] [stderr]    |                ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `error`
[INFO] [stderr]   --> src/repl/mod.rs:27:11
[INFO] [stderr]    |
[INFO] [stderr] 27 |             Err(error) => {
[INFO] [stderr]    |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_error`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let mut content = String::from("-4+2;");
[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: function is never used: `is_equal_sign`
[INFO] [stderr]   --> src/lexer/reader.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn is_equal_sign(character: &char) -> bool {
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `read_identifier`
[INFO] [stderr]   --> src/lexer/reader.rs:69:2
[INFO] [stderr]    |
[INFO] [stderr] 69 |     pub fn read_identifier(&mut self, character: char) -> Option<Token> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `is_letter`
[INFO] [stderr]   --> src/lexer/mod.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn is_letter(character: &char) -> bool {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `run`
[INFO] [stderr]  --> src/repl/mod.rs:9:2
[INFO] [stderr]   |
[INFO] [stderr] 9 |     pub fn run(){
[INFO] [stderr]   |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `read_user_input`
[INFO] [stderr]   --> src/repl/mod.rs:23:2
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn read_user_input(&mut self) -> String {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Expression`
[INFO] [stderr]   --> src/ast/mod.rs:51:2
[INFO] [stderr]    |
[INFO] [stderr] 51 |       Expression {
[INFO] [stderr]    |  _____^
[INFO] [stderr] 52 | |         token: Token,
[INFO] [stderr] 53 | |         value: Box<Statement>
[INFO] [stderr] 54 | |     },
[INFO] [stderr]    | |_____^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Call`
[INFO] [stderr]   --> src/parser/mod.rs:15:2
[INFO] [stderr]    |
[INFO] [stderr] 15 |     Call = 7
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `next_token_is_int`
[INFO] [stderr]    --> src/parser/mod.rs:236:2
[INFO] [stderr]     |
[INFO] [stderr] 236 |     fn next_token_is_int(&mut self) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable `PROMPT` should have a snake case name
[INFO] [stderr]   --> src/repl/mod.rs:11:7
[INFO] [stderr]    |
[INFO] [stderr] 11 |         let PROMPT = ">> ";
[INFO] [stderr]    |             ^^^^^^ help: convert the identifier to snake case: `prompt`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/repl/mod.rs:14:4
[INFO] [stderr]    |
[INFO] [stderr] 14 |             io::stdout().flush();
[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: 19 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.79s
[INFO] running `"docker" "inspect" "a99cf2b1dfa7564ee2f7fe0d03b4277b489a6996c5d6409f1afa3db3e6686147"`
[INFO] running `"docker" "rm" "-f" "a99cf2b1dfa7564ee2f7fe0d03b4277b489a6996c5d6409f1afa3db3e6686147"`
[INFO] [stdout] a99cf2b1dfa7564ee2f7fe0d03b4277b489a6996c5d6409f1afa3db3e6686147
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d361f06fac106bafea084748f1bfe6d7c02106a99fe51e34a51f967138d0f37e
[INFO] running `"docker" "start" "-a" "d361f06fac106bafea084748f1bfe6d7c02106a99fe51e34a51f967138d0f37e"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: unused import: `ast::Statement::*`
[INFO] [stderr]    --> src/parser/mod.rs:155:7
[INFO] [stderr]     |
[INFO] [stderr] 155 |         use ast::Statement::*;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `repl::Repl`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use repl::Repl;
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fs::File`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::fs::File;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Read`
[INFO] [stderr]  --> src/main.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use std::io::Read;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::iter::Peekable`
[INFO] [stderr]   --> src/main.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use std::iter::Peekable;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `lexer::token::Token::*`
[INFO] [stderr]   --> src/main.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 | use lexer::token::Token::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]   --> src/repl/mod.rs:26:10
[INFO] [stderr]    |
[INFO] [stderr] 26 |             Ok(n) => buffer,
[INFO] [stderr]    |                ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `error`
[INFO] [stderr]   --> src/repl/mod.rs:27:11
[INFO] [stderr]    |
[INFO] [stderr] 27 |             Err(error) => {
[INFO] [stderr]    |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_error`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let mut content = String::from("-4+2;");
[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: function is never used: `is_equal_sign`
[INFO] [stderr]   --> src/lexer/reader.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn is_equal_sign(character: &char) -> bool {
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `read_identifier`
[INFO] [stderr]   --> src/lexer/reader.rs:69:2
[INFO] [stderr]    |
[INFO] [stderr] 69 |     pub fn read_identifier(&mut self, character: char) -> Option<Token> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `is_letter`
[INFO] [stderr]   --> src/lexer/mod.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn is_letter(character: &char) -> bool {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `run`
[INFO] [stderr]  --> src/repl/mod.rs:9:2
[INFO] [stderr]   |
[INFO] [stderr] 9 |     pub fn run(){
[INFO] [stderr]   |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `read_user_input`
[INFO] [stderr]   --> src/repl/mod.rs:23:2
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn read_user_input(&mut self) -> String {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Expression`
[INFO] [stderr]   --> src/ast/mod.rs:51:2
[INFO] [stderr]    |
[INFO] [stderr] 51 |       Expression {
[INFO] [stderr]    |  _____^
[INFO] [stderr] 52 | |         token: Token,
[INFO] [stderr] 53 | |         value: Box<Statement>
[INFO] [stderr] 54 | |     },
[INFO] [stderr]    | |_____^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Call`
[INFO] [stderr]   --> src/parser/mod.rs:15:2
[INFO] [stderr]    |
[INFO] [stderr] 15 |     Call = 7
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `next_token_is_int`
[INFO] [stderr]    --> src/parser/mod.rs:236:2
[INFO] [stderr]     |
[INFO] [stderr] 236 |     fn next_token_is_int(&mut self) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable `PROMPT` should have a snake case name
[INFO] [stderr]   --> src/repl/mod.rs:11:7
[INFO] [stderr]    |
[INFO] [stderr] 11 |         let PROMPT = ">> ";
[INFO] [stderr]    |             ^^^^^^ help: convert the identifier to snake case: `prompt`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/repl/mod.rs:14:4
[INFO] [stderr]    |
[INFO] [stderr] 14 |             io::stdout().flush();
[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: 19 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/monkey_int-185360dfe113a263
[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
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "d361f06fac106bafea084748f1bfe6d7c02106a99fe51e34a51f967138d0f37e"`
[INFO] running `"docker" "rm" "-f" "d361f06fac106bafea084748f1bfe6d7c02106a99fe51e34a51f967138d0f37e"`
[INFO] [stdout] d361f06fac106bafea084748f1bfe6d7c02106a99fe51e34a51f967138d0f37e