[INFO] updating cached repository https://github.com/JoshMcguigan/monkey
[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] 6615e9295df17109f3eb9e7cff436cbdcf14d6ac
[INFO] checking JoshMcguigan/monkey against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJoshMcguigan%2Fmonkey" "/workspace/builds/worker-10/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/JoshMcguigan/monkey 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/JoshMcguigan/monkey
[INFO] finished tweaking git repo https://github.com/JoshMcguigan/monkey
[INFO] tweaked toml for git repo https://github.com/JoshMcguigan/monkey written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/JoshMcguigan/monkey 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-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] c31aef9420854a6766120b20817b04767925eded6f8541d7b4020b1dc09eb54a
[INFO] running `"docker" "start" "-a" "c31aef9420854a6766120b20817b04767925eded6f8541d7b4020b1dc09eb54a"`
[INFO] [stderr]    Compiling libc v0.2.68
[INFO] [stderr]     Checking cfg-if v0.1.6
[INFO] [stderr]    Compiling proc-macro2 v1.0.10
[INFO] [stderr]    Compiling syn v1.0.17
[INFO] [stderr]    Compiling fnv v1.0.6
[INFO] [stderr]    Compiling regex-syntax v0.6.17
[INFO] [stderr]    Compiling beef v0.4.2
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]    Compiling utf8-ranges v1.0.4
[INFO] [stderr]     Checking utf8parse v0.2.0
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling memchr v2.1.2
[INFO] [stderr]     Checking log v0.4.6
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]     Checking dirs-sys v0.3.4
[INFO] [stderr]     Checking nix v0.17.0
[INFO] [stderr]     Checking dirs v2.0.2
[INFO] [stderr]     Checking rustyline v6.1.0
[INFO] [stderr]    Compiling logos-derive v0.11.0-rc5
[INFO] [stderr]     Checking logos v0.11.0-rc5
[INFO] [stderr]     Checking monkey v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: enum is never used: `OpCode`
[INFO] [stderr]  --> src/code/mod.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: `convert_u16_to_two_u8s_be`
[INFO] [stderr]   --> src/code/mod.rs:21:4
[INFO] [stderr]    |
[INFO] [stderr] 21 | fn convert_u16_to_two_u8s_be(integer: u16) -> [u8; 2] {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `convert_two_u8s_be_to_usize`
[INFO] [stderr]   --> src/code/mod.rs:25:8
[INFO] [stderr]    |
[INFO] [stderr] 25 | pub fn convert_two_u8s_be_to_usize(int1: u8, int2: u8) -> usize {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `make_three_byte_op`
[INFO] [stderr]   --> src/code/mod.rs:29:4
[INFO] [stderr]    |
[INFO] [stderr] 29 | fn make_three_byte_op(code: u8, data: u16) -> Vec<u8> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `make_op`
[INFO] [stderr]   --> src/code/mod.rs:36:8
[INFO] [stderr]    |
[INFO] [stderr] 36 | pub fn make_op(op: OpCode) -> Vec<u8> {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `SymbolName`
[INFO] [stderr]  --> src/compiler/symbol_table.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | type SymbolName = String;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `SymbolIndex`
[INFO] [stderr]  --> src/compiler/symbol_table.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | type SymbolIndex = u16;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `SymbolTable`
[INFO] [stderr]  --> src/compiler/symbol_table.rs:6:12
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct SymbolTable {
[INFO] [stderr]   |            ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/compiler/symbol_table.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     pub fn new() -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `define`
[INFO] [stderr]   --> src/compiler/symbol_table.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 |     pub fn define(&mut self, name: SymbolName) -> SymbolIndex {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `resolve`
[INFO] [stderr]   --> src/compiler/symbol_table.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     pub fn resolve(&self, name: &SymbolName) -> Option<SymbolIndex> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/compiler/mod.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/mod.rs:26:8
[INFO] [stderr]    |
[INFO] [stderr] 26 | struct Compiler {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `compile_from_source`
[INFO] [stderr]   --> src/compiler/mod.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn compile_from_source(input: &str) -> ByteCode {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `add_constant`
[INFO] [stderr]   --> src/compiler/mod.rs:45:5
[INFO] [stderr]    |
[INFO] [stderr] 45 |     fn add_constant(&mut self, obj: Object) -> u16 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `add_instruction`
[INFO] [stderr]   --> src/compiler/mod.rs:50:5
[INFO] [stderr]    |
[INFO] [stderr] 50 |     fn add_instruction(&mut self, op_code: OpCode) -> u16 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `change_op`
[INFO] [stderr]   --> src/compiler/mod.rs:57:5
[INFO] [stderr]    |
[INFO] [stderr] 57 |     fn change_op(&mut self, position: usize, op_code: OpCode) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `compile_expression`
[INFO] [stderr]   --> src/compiler/mod.rs:63:5
[INFO] [stderr]    |
[INFO] [stderr] 63 |     fn compile_expression(&mut self, expr: Expr) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `last_instruction_is_pop`
[INFO] [stderr]    --> src/compiler/mod.rs:149:5
[INFO] [stderr]     |
[INFO] [stderr] 149 |     fn last_instruction_is_pop(&self) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `remove_last_pop`
[INFO] [stderr]    --> src/compiler/mod.rs:153:5
[INFO] [stderr]     |
[INFO] [stderr] 153 |     fn remove_last_pop(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `compile_statements`
[INFO] [stderr]    --> src/compiler/mod.rs:157:5
[INFO] [stderr]     |
[INFO] [stderr] 157 |     fn compile_statements(&mut self, ast: Vec<Statement>) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `compile_from_source`
[INFO] [stderr]    --> src/compiler/mod.rs:178:8
[INFO] [stderr]     |
[INFO] [stderr] 178 | pub fn compile_from_source(input: &str) -> ByteCode {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `STACK_SIZE`
[INFO] [stderr]  --> src/vm/mod.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | const STACK_SIZE : usize = 2048;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `GLOBAL_SIZE`
[INFO] [stderr]  --> src/vm/mod.rs:9:1
[INFO] [stderr]   |
[INFO] [stderr] 9 | const GLOBAL_SIZE : usize = 2048;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `VM`
[INFO] [stderr]   --> src/vm/mod.rs:11:8
[INFO] [stderr]    |
[INFO] [stderr] 11 | struct VM {
[INFO] [stderr]    |        ^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/vm/mod.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 |     fn new(byte_code: ByteCode) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `run`
[INFO] [stderr]   --> src/vm/mod.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 33 |     fn run(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `push`
[INFO] [stderr]    --> src/vm/mod.rs:164:5
[INFO] [stderr]     |
[INFO] [stderr] 164 |     fn push(&mut self, obj: Object) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `pop`
[INFO] [stderr]    --> src/vm/mod.rs:169:5
[INFO] [stderr]     |
[INFO] [stderr] 169 |     fn pop(&mut self) -> Object {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `last_popped`
[INFO] [stderr]    --> src/vm/mod.rs:178:5
[INFO] [stderr]     |
[INFO] [stderr] 178 |     fn last_popped(&self) -> &Object {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 30 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 49.75s
[INFO] running `"docker" "inspect" "c31aef9420854a6766120b20817b04767925eded6f8541d7b4020b1dc09eb54a"`
[INFO] running `"docker" "rm" "-f" "c31aef9420854a6766120b20817b04767925eded6f8541d7b4020b1dc09eb54a"`
[INFO] [stdout] c31aef9420854a6766120b20817b04767925eded6f8541d7b4020b1dc09eb54a