[INFO] cloning repository https://github.com/mthom26/monkey-lang
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mthom26/monkey-lang" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmthom26%2Fmonkey-lang", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmthom26%2Fmonkey-lang'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 92289eca2a3216ee6042403ecaf1d63e05e29dc0
[INFO] checking mthom26/monkey-lang against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmthom26%2Fmonkey-lang" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mthom26/monkey-lang on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mthom26/monkey-lang
[INFO] finished tweaking git repo https://github.com/mthom26/monkey-lang
[INFO] tweaked toml for git repo https://github.com/mthom26/monkey-lang written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/mthom26/monkey-lang already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9cfc6a592ee031873dca1c68983276badaf95b9887d6d6aff62301f9978c4314
[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" "9cfc6a592ee031873dca1c68983276badaf95b9887d6d6aff62301f9978c4314", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9cfc6a592ee031873dca1c68983276badaf95b9887d6d6aff62301f9978c4314", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9cfc6a592ee031873dca1c68983276badaf95b9887d6d6aff62301f9978c4314", kill_on_drop: false }`
[INFO] [stdout] 9cfc6a592ee031873dca1c68983276badaf95b9887d6d6aff62301f9978c4314
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8d4db29580802c8f2c1271eaebf4cacaecf25716a18213540df1b3d36fa2f246
[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" "8d4db29580802c8f2c1271eaebf4cacaecf25716a18213540df1b3d36fa2f246", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking utf8parse v0.1.1
[INFO] [stderr]     Checking unicode-segmentation v1.3.0
[INFO] [stderr]     Checking dirs-sys v0.3.4
[INFO] [stderr]     Checking nix v0.14.1
[INFO] [stderr]     Checking dirs v2.0.2
[INFO] [stderr]     Checking rustyline v5.0.3
[INFO] [stderr]     Checking monkey-lang v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: enum is never used: `OpCode`
[INFO] [stdout]  --> src/compiler/code.rs:1:10
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub enum OpCode {
[INFO] [stdout]   |          ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `make_op`
[INFO] [stdout]   --> src/compiler/code.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn make_op(opcode: OpCode) -> Vec<u8> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `two_u8_to_usize`
[INFO] [stdout]   --> src/compiler/code.rs:80:8
[INFO] [stdout]    |
[INFO] [stdout] 80 | pub fn two_u8_to_usize(int_one: u8, int_two: u8) -> usize {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `GLOBAL`
[INFO] [stdout]  --> src/compiler/compiler.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | const GLOBAL: &str = "GLOBAL";
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/compiler/compiler.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Compiler`
[INFO] [stdout]   --> src/compiler/compiler.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub struct Compiler {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `from_source`
[INFO] [stdout]   --> src/compiler/compiler.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub fn from_source(input: &str) -> ByteCode {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `compile_statements`
[INFO] [stdout]   --> src/compiler/compiler.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 46 |     fn compile_statements(&mut self, ast: Vec<Statement>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `compile_expression`
[INFO] [stdout]   --> src/compiler/compiler.rs:63:8
[INFO] [stdout]    |
[INFO] [stdout] 63 |     fn compile_expression(&mut self, expr: Expression) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_constant`
[INFO] [stdout]    --> src/compiler/compiler.rs:147:8
[INFO] [stdout]     |
[INFO] [stdout] 147 |     fn add_constant(&mut self, object: Object) -> u16 {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_instruction`
[INFO] [stdout]    --> src/compiler/compiler.rs:153:8
[INFO] [stdout]     |
[INFO] [stdout] 153 |     fn add_instruction(&mut self, op_code: OpCode) -> u16 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_last_instruction_pop`
[INFO] [stdout]    --> src/compiler/compiler.rs:161:8
[INFO] [stdout]     |
[INFO] [stdout] 161 |     fn is_last_instruction_pop(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove_last_pop`
[INFO] [stdout]    --> src/compiler/compiler.rs:165:8
[INFO] [stdout]     |
[INFO] [stdout] 165 |     fn remove_last_pop(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `replace_op`
[INFO] [stdout]    --> src/compiler/compiler.rs:170:8
[INFO] [stdout]     |
[INFO] [stdout] 170 |     fn replace_op(&mut self, pos: usize, opcode: OpCode) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Symbol`
[INFO] [stdout]  --> src/compiler/symbol_table.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Symbol {
[INFO] [stdout]   |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]  --> src/compiler/symbol_table.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 |     pub fn new(index: u16, scope: String) -> Self {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `SymbolTable`
[INFO] [stdout]   --> src/compiler/symbol_table.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub struct SymbolTable {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/compiler/symbol_table.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `define`
[INFO] [stdout]   --> src/compiler/symbol_table.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 |     pub fn define(&mut self, name: String, scope: String) -> u16 {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `resolve`
[INFO] [stdout]   --> src/compiler/symbol_table.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 34 |     pub fn resolve(&self, name: String) -> Option<u16> {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `STACK_SIZE`
[INFO] [stdout]  --> src/vm.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | const STACK_SIZE: usize = 2048;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `GLOBAL_SIZE`
[INFO] [stdout]  --> src/vm.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | const GLOBAL_SIZE: usize = 2048; // Setting this too high causes an overflow
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Vm`
[INFO] [stdout]   --> src/vm.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct Vm {
[INFO] [stdout]    |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/vm.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 |     fn new(bytecode: ByteCode) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `run`
[INFO] [stdout]   --> src/vm.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 |     fn run(&mut self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push`
[INFO] [stdout]    --> src/vm.rs:195:8
[INFO] [stdout]     |
[INFO] [stdout] 195 |     fn push(&mut self, obj: Object) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop`
[INFO] [stdout]    --> src/vm.rs:204:8
[INFO] [stdout]     |
[INFO] [stdout] 204 |     fn pop(&mut self) -> Object {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `print_stack`
[INFO] [stdout]    --> src/vm.rs:210:8
[INFO] [stdout]     |
[INFO] [stdout] 210 |     fn print_stack(&self, num: usize) {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 28 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `scope`
[INFO] [stdout]  --> src/compiler/symbol_table.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     scope: String,
[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: `print_stack`
[INFO] [stdout]    --> src/vm.rs:210:8
[INFO] [stdout]     |
[INFO] [stdout] 210 |     fn print_stack(&self, num: usize) {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.12s
[INFO] running `Command { std: "docker" "inspect" "8d4db29580802c8f2c1271eaebf4cacaecf25716a18213540df1b3d36fa2f246", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d4db29580802c8f2c1271eaebf4cacaecf25716a18213540df1b3d36fa2f246", kill_on_drop: false }`
[INFO] [stdout] 8d4db29580802c8f2c1271eaebf4cacaecf25716a18213540df1b3d36fa2f246