[INFO] cloning repository https://github.com/gengjiawen/monkey_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gengjiawen/monkey_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgengjiawen%2Fmonkey_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgengjiawen%2Fmonkey_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 155ec14965b02cdc6cc63a5b43a7788673ff1d2f
[INFO] checking gengjiawen/monkey_rust against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgengjiawen%2Fmonkey_rust" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/gengjiawen/monkey_rust on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/gengjiawen/monkey_rust
[INFO] finished tweaking git repo https://github.com/gengjiawen/monkey_rust
[INFO] tweaked toml for git repo https://github.com/gengjiawen/monkey_rust written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/gengjiawen/monkey_rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bb0e253215bff1909c8e6c0292c98bdabb79122069076af463e95d341096af2e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "bb0e253215bff1909c8e6c0292c98bdabb79122069076af463e95d341096af2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bb0e253215bff1909c8e6c0292c98bdabb79122069076af463e95d341096af2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb0e253215bff1909c8e6c0292c98bdabb79122069076af463e95d341096af2e", kill_on_drop: false }`
[INFO] [stdout] bb0e253215bff1909c8e6c0292c98bdabb79122069076af463e95d341096af2e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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=forbid" "-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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] b2802ec9ebcdfc08371df6afe80ec23a23c6dcf0091a0ede3e9ccc453c070ab0
[INFO] running `Command { std: "docker" "start" "-a" "b2802ec9ebcdfc08371df6afe80ec23a23c6dcf0091a0ede3e9ccc453c070ab0", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling syn v1.0.42
[INFO] [stderr]    Compiling serde_derive v1.0.116
[INFO] [stderr]    Compiling serde v1.0.116
[INFO] [stderr]    Compiling serde_json v1.0.58
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]     Checking difference v2.0.0
[INFO] [stderr]     Checking monkey_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking termios v0.3.2
[INFO] [stderr]     Checking terminal_size v0.1.13
[INFO] [stdout] warning: variant `NOT_EQ` should have an upper camel case name
[INFO] [stdout]   --> lib/lexer/token.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     NOT_EQ, // !=
[INFO] [stdout]    |     ^^^^^^ help: convert the identifier to upper camel case: `NotEq`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek_char`
[INFO] [stdout]   --> lib/lexer/mod.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 40 |     fn peek_char(&self) -> char {
[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: `next_token`
[INFO] [stdout]   --> lib/lexer/mod.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 |     fn next_token(&mut self) -> Token {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `skip_whitespace`
[INFO] [stdout]   --> lib/lexer/mod.rs:99:8
[INFO] [stdout]    |
[INFO] [stdout] 99 |     fn skip_whitespace(&mut self) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `read_identifier`
[INFO] [stdout]    --> lib/lexer/mod.rs:105:8
[INFO] [stdout]     |
[INFO] [stdout] 105 |     fn read_identifier(&mut self) -> String {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `read_number`
[INFO] [stdout]    --> lib/lexer/mod.rs:114:8
[INFO] [stdout]     |
[INFO] [stdout] 114 |     fn read_number(&mut self) -> i64 {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_letter`
[INFO] [stdout]    --> lib/lexer/mod.rs:124:4
[INFO] [stdout]     |
[INFO] [stdout] 124 | fn is_letter(c: char) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_digit`
[INFO] [stdout]    --> lib/lexer/mod.rs:128:4
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn is_digit(c: char) -> bool {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking console v0.12.0
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]     Checking serde_yaml v0.8.13
[INFO] [stderr]     Checking insta v1.0.0
[INFO] [stdout] warning: variant `NOT_EQ` should have an upper camel case name
[INFO] [stdout]   --> lib/lexer/token.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     NOT_EQ, // !=
[INFO] [stdout]    |     ^^^^^^ help: convert the identifier to upper camel case: `NotEq`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 49.40s
[INFO] running `Command { std: "docker" "inspect" "b2802ec9ebcdfc08371df6afe80ec23a23c6dcf0091a0ede3e9ccc453c070ab0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2802ec9ebcdfc08371df6afe80ec23a23c6dcf0091a0ede3e9ccc453c070ab0", kill_on_drop: false }`
[INFO] [stdout] b2802ec9ebcdfc08371df6afe80ec23a23c6dcf0091a0ede3e9ccc453c070ab0