[INFO] cloning repository https://github.com/xd009642/rustybug
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/xd009642/rustybug" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxd009642%2Frustybug", kill_on_drop: false }`
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[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b8ed8680843dc97d60d308727cee2c0eff9b49d0
[INFO] checking xd009642/rustybug against eca445e5ae4a6679cc27d3a09106ce245e13a5a6 for pr-162478
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxd009642%2Frustybug" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/xd009642/rustybug
[INFO] finished tweaking git repo https://github.com/xd009642/rustybug
[INFO] tweaked toml for git repo https://github.com/xd009642/rustybug written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/xd009642/rustybug on toolchain eca445e5ae4a6679cc27d3a09106ce245e13a5a6
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[INFO] crate git repo https://github.com/xd009642/rustybug already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+eca445e5ae4a6679cc27d3a09106ce245e13a5a6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "17a4ea367b6e56686ec26202627796f4340ecbb90b71adff7eb7aad45b90558b" "/opt/rustwide/cargo-home/bin/cargo" "+eca445e5ae4a6679cc27d3a09106ce245e13a5a6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "17a4ea367b6e56686ec26202627796f4340ecbb90b71adff7eb7aad45b90558b", kill_on_drop: false }`
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[INFO] [stdout] warning: unused imports: `DebuggingInformationEntry` and `UnitHeader`
[INFO] [stdout]  --> src/elf.rs:3:21
[INFO] [stdout]   |
[INFO] [stdout] 3 |     AttributeValue, DebuggingInformationEntry, Dwarf, DwarfFileType, EndianSlice, RunTimeEndian,
[INFO] [stdout]   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 4 |     Unit, UnitHeader, UnitOffset,
[INFO] [stdout]   |           ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ReadCache`
[INFO] [stdout]  --> src/elf.rs:7:27
[INFO] [stdout]   |
[INFO] [stdout] 7 |     read::{ObjectSection, ReadCache, ReadRef},
[INFO] [stdout]   |                           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rustc_demangle::demangle`
[INFO] [stdout]   --> src/elf.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use rustc_demangle::demangle;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `HashSet`
[INFO] [stdout]   --> src/elf.rs:11:33
[INFO] [stdout]    |
[INFO] [stdout] 11 | use std::collections::{HashMap, HashSet};
[INFO] [stdout]    |                                 ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `debug` and `trace`
[INFO] [stdout]   --> src/elf.rs:18:15
[INFO] [stdout]    |
[INFO] [stdout] 18 | use tracing::{debug, error, trace, warn};
[INFO] [stdout]    |               ^^^^^         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/linux.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::process::Command`
[INFO] [stdout]   --> src/linux.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::process::Command;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `DebuggingInformationEntry` and `UnitHeader`
[INFO] [stdout]  --> src/elf.rs:3:21
[INFO] [stdout]   |
[INFO] [stdout] 3 |     AttributeValue, DebuggingInformationEntry, Dwarf, DwarfFileType, EndianSlice, RunTimeEndian,
[INFO] [stdout]   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 4 |     Unit, UnitHeader, UnitOffset,
[INFO] [stdout]   |           ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ReadCache`
[INFO] [stdout]  --> src/elf.rs:7:27
[INFO] [stdout]   |
[INFO] [stdout] 7 |     read::{ObjectSection, ReadCache, ReadRef},
[INFO] [stdout]   |                           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rustc_demangle::demangle`
[INFO] [stdout]   --> src/elf.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use rustc_demangle::demangle;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `HashSet`
[INFO] [stdout]   --> src/elf.rs:11:33
[INFO] [stdout]    |
[INFO] [stdout] 11 | use std::collections::{HashMap, HashSet};
[INFO] [stdout]    |                                 ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `debug` and `trace`
[INFO] [stdout]   --> src/elf.rs:18:15
[INFO] [stdout]    |
[INFO] [stdout] 18 | use tracing::{debug, error, trace, warn};
[INFO] [stdout]    |               ^^^^^         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/linux.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::process::Command`
[INFO] [stdout]   --> src/linux.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::process::Command;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/linux.rs:96:5
[INFO] [stdout]    |
[INFO] [stdout] 94 |     execve(&program, &arg_ref, &env_ref)?;
[INFO] [stdout]    |     ------------------------------------- any code following this expression is unreachable
[INFO] [stdout] 95 |
[INFO] [stdout] 96 |     unreachable!();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ReadRef`
[INFO] [stdout]  --> src/elf.rs:7:38
[INFO] [stdout]   |
[INFO] [stdout] 7 |     read::{ObjectSection, ReadCache, ReadRef},
[INFO] [stdout]   |                                      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/linux.rs:96:5
[INFO] [stdout]    |
[INFO] [stdout] 94 |     execve(&program, &arg_ref, &env_ref)?;
[INFO] [stdout]    |     ------------------------------------- any code following this expression is unreachable
[INFO] [stdout] 95 |
[INFO] [stdout] 96 |     unreachable!();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `file`
[INFO] [stdout]    --> src/elf.rs:103:13
[INFO] [stdout]     |
[INFO] [stdout] 103 |         let file = cache_file(path).map_err(|e| {
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_file`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `file`
[INFO] [stdout]    --> src/elf.rs:149:30
[INFO] [stdout]     |
[INFO] [stdout] 149 |             Location::Line { file, line } => todo!(),
[INFO] [stdout]     |                              ^^^^ help: try ignoring the field: `file: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `line`
[INFO] [stdout]    --> src/elf.rs:149:36
[INFO] [stdout]     |
[INFO] [stdout] 149 |             Location::Line { file, line } => todo!(),
[INFO] [stdout]     |                                    ^^^^ help: try ignoring the field: `line: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fn_name`
[INFO] [stdout]    --> src/elf.rs:150:32
[INFO] [stdout]     |
[INFO] [stdout] 150 |             Location::Function(fn_name) => todo!(),
[INFO] [stdout]     |                                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_fn_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `delta_depth`
[INFO] [stdout]    --> src/elf.rs:197:25
[INFO] [stdout]     |
[INFO] [stdout] 197 |         while let Some((delta_depth, current)) = cursor
[INFO] [stdout]     |                         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_delta_depth`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `delta_depth`
[INFO] [stdout]    --> src/elf.rs:233:33
[INFO] [stdout]     |
[INFO] [stdout] 233 |                 while let Some((delta_depth, current)) = cursor
[INFO] [stdout]     |                                 ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_delta_depth`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `write`
[INFO] [stdout]   --> src/linux.rs:35:16
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let (read, write) = pipe2(OFlag::O_CLOEXEC)?;
[INFO] [stdout]    |                ^^^^^ help: if this is intentional, prefix it with an underscore: `_write`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ReadRef`
[INFO] [stdout]  --> src/elf.rs:7:38
[INFO] [stdout]   |
[INFO] [stdout] 7 |     read::{ObjectSection, ReadCache, ReadRef},
[INFO] [stdout]   |                                      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sig`
[INFO] [stdout]    --> src/process.rs:310:13
[INFO] [stdout]     |
[INFO] [stdout] 310 |             sig @ WaitStatus::Exited(child, ret_code) => {
[INFO] [stdout]     |             ^^^ help: if this is intentional, prefix it with an underscore: `_sig`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `child`
[INFO] [stdout]    --> src/process.rs:320:33
[INFO] [stdout]     |
[INFO] [stdout] 320 |             WaitStatus::Stopped(child, signal) => {
[INFO] [stdout]     |                                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_child`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pid`
[INFO] [stdout]    --> src/process.rs:324:34
[INFO] [stdout]     |
[INFO] [stdout] 324 |             WaitStatus::Signaled(pid, signal, has_coredump) => {
[INFO] [stdout]     |                                  ^^^ help: if this is intentional, prefix it with an underscore: `_pid`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `has_coredump`
[INFO] [stdout]    --> src/process.rs:324:47
[INFO] [stdout]     |
[INFO] [stdout] 324 |             WaitStatus::Signaled(pid, signal, has_coredump) => {
[INFO] [stdout]     |                                               ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_has_coredump`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pid`
[INFO] [stdout]    --> src/process.rs:328:37
[INFO] [stdout]     |
[INFO] [stdout] 328 |             WaitStatus::PtraceEvent(pid, signal, event) => {
[INFO] [stdout]     |                                     ^^^ help: if this is intentional, prefix it with an underscore: `_pid`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `file`
[INFO] [stdout]    --> src/elf.rs:103:13
[INFO] [stdout]     |
[INFO] [stdout] 103 |         let file = cache_file(path).map_err(|e| {
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_file`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `file`
[INFO] [stdout]    --> src/elf.rs:149:30
[INFO] [stdout]     |
[INFO] [stdout] 149 |             Location::Line { file, line } => todo!(),
[INFO] [stdout]     |                              ^^^^ help: try ignoring the field: `file: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `line`
[INFO] [stdout]    --> src/elf.rs:149:36
[INFO] [stdout]     |
[INFO] [stdout] 149 |             Location::Line { file, line } => todo!(),
[INFO] [stdout]     |                                    ^^^^ help: try ignoring the field: `line: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fn_name`
[INFO] [stdout]    --> src/elf.rs:150:32
[INFO] [stdout]     |
[INFO] [stdout] 150 |             Location::Function(fn_name) => todo!(),
[INFO] [stdout]     |                                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_fn_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `args` is never read
[INFO] [stdout]   --> src/lib.rs:56:5
[INFO] [stdout]    |
[INFO] [stdout] 53 | pub struct DebuggerStateMachine {
[INFO] [stdout]    |            -------------------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 56 |     args: Args,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `DebuggerStateMachine` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `compile_unit_containing_address` and `function_containing_address` are never used
[INFO] [stdout]    --> src/elf.rs:162:8
[INFO] [stdout]     |
[INFO] [stdout] 101 | impl ExecutableFile {
[INFO] [stdout]     | ------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 162 |     fn compile_unit_containing_address(
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 186 |     fn function_containing_address<'a>(
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `delta_depth`
[INFO] [stdout]    --> src/elf.rs:197:25
[INFO] [stdout]     |
[INFO] [stdout] 197 |         while let Some((delta_depth, current)) = cursor
[INFO] [stdout]     |                         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_delta_depth`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `delta_depth`
[INFO] [stdout]    --> src/elf.rs:233:33
[INFO] [stdout]     |
[INFO] [stdout] 233 |                 while let Some((delta_depth, current)) = cursor
[INFO] [stdout]     |                                 ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_delta_depth`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `write`
[INFO] [stdout]   --> src/linux.rs:35:16
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let (read, write) = pipe2(OFlag::O_CLOEXEC)?;
[INFO] [stdout]    |                ^^^^^ help: if this is intentional, prefix it with an underscore: `_write`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sig`
[INFO] [stdout]    --> src/process.rs:310:13
[INFO] [stdout]     |
[INFO] [stdout] 310 |             sig @ WaitStatus::Exited(child, ret_code) => {
[INFO] [stdout]     |             ^^^ help: if this is intentional, prefix it with an underscore: `_sig`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `child`
[INFO] [stdout]    --> src/process.rs:320:33
[INFO] [stdout]     |
[INFO] [stdout] 320 |             WaitStatus::Stopped(child, signal) => {
[INFO] [stdout]     |                                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_child`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pid`
[INFO] [stdout]    --> src/process.rs:324:34
[INFO] [stdout]     |
[INFO] [stdout] 324 |             WaitStatus::Signaled(pid, signal, has_coredump) => {
[INFO] [stdout]     |                                  ^^^ help: if this is intentional, prefix it with an underscore: `_pid`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `has_coredump`
[INFO] [stdout]    --> src/process.rs:324:47
[INFO] [stdout]     |
[INFO] [stdout] 324 |             WaitStatus::Signaled(pid, signal, has_coredump) => {
[INFO] [stdout]     |                                               ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_has_coredump`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pid`
[INFO] [stdout]    --> src/process.rs:328:37
[INFO] [stdout]     |
[INFO] [stdout] 328 |             WaitStatus::PtraceEvent(pid, signal, event) => {
[INFO] [stdout]     |                                     ^^^ help: if this is intentional, prefix it with an underscore: `_pid`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `args` is never read
[INFO] [stdout]   --> src/lib.rs:56:5
[INFO] [stdout]    |
[INFO] [stdout] 53 | pub struct DebuggerStateMachine {
[INFO] [stdout]    |            -------------------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 56 |     args: Args,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `DebuggerStateMachine` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> tests/simple.rs:174:9
[INFO] [stdout]     |
[INFO] [stdout] 174 |         sm.cont();
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 174 |         let _ = sm.cont();
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: unused dependency `cpp_demangle`
[INFO] [stderr]  --> Cargo.toml:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | cpp_demangle = "0.4.4"
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `cargo::unused_dependencies` is set to `warn` by default
[INFO] [stderr] help: consider removing the dependency on `cpp_demangle`
[INFO] [stderr] warning: unused dependency `num_cpus`
[INFO] [stderr]  --> Cargo.toml:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | num_cpus = "1.16.0"
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: consider removing the dependency on `num_cpus`
[INFO] [stderr] warning: `rustybug` (manifest) generated 2 warnings
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 32.39s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: nix v0.29.0
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 2`
[INFO] running `Command { std: "docker" "inspect" "17a4ea367b6e56686ec26202627796f4340ecbb90b71adff7eb7aad45b90558b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17a4ea367b6e56686ec26202627796f4340ecbb90b71adff7eb7aad45b90558b", kill_on_drop: false }`
[INFO] [stdout] 17a4ea367b6e56686ec26202627796f4340ecbb90b71adff7eb7aad45b90558b
