[INFO] updating cached repository https://github.com/mthom26/monkey-lang
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 92289eca2a3216ee6042403ecaf1d63e05e29dc0
[INFO] checking mthom26/monkey-lang against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmthom26%2Fmonkey-lang" "/workspace/builds/worker-0/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mthom26/monkey-lang on toolchain e4dba30b9b475d8750370c4dfb49b6541990904d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "read-manifest" "--manifest-path" "Cargo.toml"`
[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-0/source/Cargo.toml
[INFO] crate git repo https://github.com/mthom26/monkey-lang already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 393fb8f2648ed4ba0467a0254f20aaef638cc23635c5159b91b70e6d2d8e86f6
[INFO] running `"docker" "start" "-a" "393fb8f2648ed4ba0467a0254f20aaef638cc23635c5159b91b70e6d2d8e86f6"`
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling bitflags v1.2.0
[INFO] [stderr]    Compiling nix v0.14.1
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking utf8parse v0.1.1
[INFO] [stderr]     Checking unicode-width v0.1.6
[INFO] [stderr]     Checking unicode-segmentation v1.3.0
[INFO] [stderr]     Checking log v0.4.8
[INFO] [stderr]     Checking dirs-sys v0.3.4
[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] [stderr] warning: enum is never used: `OpCode`
[INFO] [stderr]  --> src/compiler/code.rs:1:10
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub enum OpCode {
[INFO] [stderr]   |          ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `make_op`
[INFO] [stderr]   --> src/compiler/code.rs:22:8
[INFO] [stderr]    |
[INFO] [stderr] 22 | pub fn make_op(opcode: OpCode) -> Vec<u8> {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `two_u8_to_usize`
[INFO] [stderr]   --> src/compiler/code.rs:80:8
[INFO] [stderr]    |
[INFO] [stderr] 80 | pub fn two_u8_to_usize(int_one: u8, int_two: u8) -> usize {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `GLOBAL`
[INFO] [stderr]  --> src/compiler/compiler.rs:9:1
[INFO] [stderr]   |
[INFO] [stderr] 9 | const GLOBAL: &str = "GLOBAL";
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/compiler/compiler.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     fn new() -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Compiler`
[INFO] [stderr]   --> src/compiler/compiler.rs:26:12
[INFO] [stderr]    |
[INFO] [stderr] 26 | pub struct Compiler {
[INFO] [stderr]    |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `from_source`
[INFO] [stderr]   --> src/compiler/compiler.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn from_source(input: &str) -> ByteCode {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `compile_statements`
[INFO] [stderr]   --> src/compiler/compiler.rs:46:5
[INFO] [stderr]    |
[INFO] [stderr] 46 |     fn compile_statements(&mut self, ast: Vec<Statement>) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `compile_expression`
[INFO] [stderr]   --> src/compiler/compiler.rs:63:5
[INFO] [stderr]    |
[INFO] [stderr] 63 |     fn compile_expression(&mut self, expr: Expression) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `add_constant`
[INFO] [stderr]    --> src/compiler/compiler.rs:147:5
[INFO] [stderr]     |
[INFO] [stderr] 147 |     fn add_constant(&mut self, object: Object) -> u16 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `add_instruction`
[INFO] [stderr]    --> src/compiler/compiler.rs:153:5
[INFO] [stderr]     |
[INFO] [stderr] 153 |     fn add_instruction(&mut self, op_code: OpCode) -> u16 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_last_instruction_pop`
[INFO] [stderr]    --> src/compiler/compiler.rs:161:5
[INFO] [stderr]     |
[INFO] [stderr] 161 |     fn is_last_instruction_pop(&self) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `remove_last_pop`
[INFO] [stderr]    --> src/compiler/compiler.rs:165:5
[INFO] [stderr]     |
[INFO] [stderr] 165 |     fn remove_last_pop(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `replace_op`
[INFO] [stderr]    --> src/compiler/compiler.rs:170:5
[INFO] [stderr]     |
[INFO] [stderr] 170 |     fn replace_op(&mut self, pos: usize, opcode: OpCode) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Symbol`
[INFO] [stderr]  --> src/compiler/symbol_table.rs:3:12
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub struct Symbol {
[INFO] [stderr]   |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]  --> src/compiler/symbol_table.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     pub fn new(index: u16, scope: String) -> Self {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `SymbolTable`
[INFO] [stderr]   --> src/compiler/symbol_table.rs:14:12
[INFO] [stderr]    |
[INFO] [stderr] 14 | pub struct SymbolTable {
[INFO] [stderr]    |            ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/compiler/symbol_table.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 |     pub fn new() -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `define`
[INFO] [stderr]   --> src/compiler/symbol_table.rs:27:5
[INFO] [stderr]    |
[INFO] [stderr] 27 |     pub fn define(&mut self, name: String, scope: String) -> u16 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `resolve`
[INFO] [stderr]   --> src/compiler/symbol_table.rs:34:5
[INFO] [stderr]    |
[INFO] [stderr] 34 |     pub fn resolve(&self, name: String) -> Option<u16> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `STACK_SIZE`
[INFO] [stderr]  --> src/vm.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | const STACK_SIZE: usize = 2048;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `GLOBAL_SIZE`
[INFO] [stderr]  --> src/vm.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | const GLOBAL_SIZE: usize = 2048; // Setting this too high causes an overflow
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Vm`
[INFO] [stderr]   --> src/vm.rs:10:12
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub struct Vm {
[INFO] [stderr]    |            ^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/vm.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     fn new(bytecode: ByteCode) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `run`
[INFO] [stderr]   --> src/vm.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     fn run(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `push`
[INFO] [stderr]    --> src/vm.rs:195:5
[INFO] [stderr]     |
[INFO] [stderr] 195 |     fn push(&mut self, obj: Object) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `pop`
[INFO] [stderr]    --> src/vm.rs:204:5
[INFO] [stderr]     |
[INFO] [stderr] 204 |     fn pop(&mut self) -> Object {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print_stack`
[INFO] [stderr]    --> src/vm.rs:210:5
[INFO] [stderr]     |
[INFO] [stderr] 210 |     fn print_stack(&self, num: usize) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 28 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `scope`
[INFO] [stderr]  --> src/compiler/symbol_table.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     scope: String,
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print_stack`
[INFO] [stderr]    --> src/vm.rs:210:5
[INFO] [stderr]     |
[INFO] [stderr] 210 |     fn print_stack(&self, num: usize) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 14.20s
[INFO] running `"docker" "inspect" "393fb8f2648ed4ba0467a0254f20aaef638cc23635c5159b91b70e6d2d8e86f6"`
[INFO] running `"docker" "rm" "-f" "393fb8f2648ed4ba0467a0254f20aaef638cc23635c5159b91b70e6d2d8e86f6"`
[INFO] [stdout] 393fb8f2648ed4ba0467a0254f20aaef638cc23635c5159b91b70e6d2d8e86f6