[INFO] cloning repository https://github.com/hobarak/rustdatastructures
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hobarak/rustdatastructures" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhobarak%2Frustdatastructures", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhobarak%2Frustdatastructures'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9c2d49596d650b84b5478d3471d82ba0010ab4de
[INFO] testing hobarak/rustdatastructures against 1.99.0-beta.1+cargoflags=--release for beta-release-1.99-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhobarak%2Frustdatastructures" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/hobarak/rustdatastructures
[INFO] finished tweaking git repo https://github.com/hobarak/rustdatastructures
[INFO] tweaked toml for git repo https://github.com/hobarak/rustdatastructures written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/hobarak/rustdatastructures on toolchain 1.99.0-beta.1
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/hobarak/rustdatastructures 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" "+1.99.0-beta.1" "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-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:8683fc1fc2eb5c9ac98e0d076ab094b2ffac7f99da555d2b6a2e27f346de2ec7" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stderr] Error response from daemon: failed to create prepare snapshot dir: failed to create temp dir: mkdir /var/lib/containerd/io.containerd.snapshotter.v1.overlayfs/snapshots/new-3568584400: no space left on device
[INFO] testing hobarak/rustdatastructures against 1.99.0-beta.1+cargoflags=--release for beta-release-1.99-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhobarak%2Frustdatastructures" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/hobarak/rustdatastructures
[INFO] finished tweaking git repo https://github.com/hobarak/rustdatastructures
[INFO] tweaked toml for git repo https://github.com/hobarak/rustdatastructures written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/hobarak/rustdatastructures on toolchain 1.99.0-beta.1
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/hobarak/rustdatastructures 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" "+1.99.0-beta.1" "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-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:8683fc1fc2eb5c9ac98e0d076ab094b2ffac7f99da555d2b6a2e27f346de2ec7" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 47cb9abd4ca9a8ad8bca07df8f4e3e3fd0bc4ed2d572322df2e4e3301c8260ab
[INFO] running `Command { std: "docker" "start" "47cb9abd4ca9a8ad8bca07df8f4e3e3fd0bc4ed2d572322df2e4e3301c8260ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "47cb9abd4ca9a8ad8bca07df8f4e3e3fd0bc4ed2d572322df2e4e3301c8260ab", kill_on_drop: false }`
[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" "47cb9abd4ca9a8ad8bca07df8f4e3e3fd0bc4ed2d572322df2e4e3301c8260ab" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "47cb9abd4ca9a8ad8bca07df8f4e3e3fd0bc4ed2d572322df2e4e3301c8260ab", kill_on_drop: false }`
[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" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "47cb9abd4ca9a8ad8bca07df8f4e3e3fd0bc4ed2d572322df2e4e3301c8260ab" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.1" "build" "--frozen" "--message-format=json" "--release", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.69
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.12
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling syn v1.0.21
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling slab v0.4.2
[INFO] [stderr]    Compiling ppv-lite86 v0.2.6
[INFO] [stderr]    Compiling arc-swap v0.4.6
[INFO] [stderr]    Compiling futures-core v0.3.5
[INFO] [stderr]    Compiling fnv v1.0.6
[INFO] [stderr]    Compiling bytes v0.5.4
[INFO] [stderr]    Compiling pin-project-lite v0.1.5
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]    Compiling iovec v0.1.4
[INFO] [stderr]    Compiling net2 v0.2.34
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling signal-hook-registry v1.2.0
[INFO] [stderr]    Compiling time v0.1.43
[INFO] [stderr]    Compiling quote v1.0.5
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling threadpool v1.8.0
[INFO] [stderr]    Compiling mio v0.6.22
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling ordered-float v1.0.2
[INFO] [stderr]    Compiling chrono v0.4.11
[INFO] [stderr]    Compiling mio-uds v0.6.8
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]    Compiling tokio v0.2.21
[INFO] [stderr]    Compiling rustdatastructures v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0432]: unresolved import `std::intrinsics::drop_in_place`
[INFO] [stdout]  --> src/pointers/simplebox.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     intrinsics::drop_in_place,
[INFO] [stdout]   |     ^^^^^^^^^^^^-------------
[INFO] [stdout]   |                 |
[INFO] [stdout]   |                 no `drop_in_place` in `intrinsics`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `AtomicBool`, `AtomicUsize`, and `Ordering`
[INFO] [stdout]  --> src/artofmultiprocessor/ch10.rs:1:25
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
[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 imports: `Cell`, `UnsafeCell`, and `sync::Arc`
[INFO] [stdout]  --> src/artofmultiprocessor/ch10.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 |     cell::{Cell, UnsafeCell},
[INFO] [stdout]   |            ^^^^  ^^^^^^^^^^
[INFO] [stdout] 4 |     sync::Arc,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `thread::JoinHandle`
[INFO] [stdout]  --> src/artofmultiprocessor/ch10.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use thread::JoinHandle;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Cell` and `sync::Arc`
[INFO] [stdout]  --> src/artofmultiprocessor/ch2.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 |     cell::{Cell, UnsafeCell},
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 4 |     sync::Arc,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `thread::JoinHandle`
[INFO] [stdout]  --> src/artofmultiprocessor/ch2.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use thread::JoinHandle;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `chrono::prelude::*`
[INFO] [stdout]  --> src/artofmultiprocessor/ch7.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use chrono::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `RefCell`
[INFO] [stdout]  --> src/artofmultiprocessor/ch7.rs:4:18
[INFO] [stdout]   |
[INFO] [stdout] 4 |     cell::{Cell, RefCell, UnsafeCell},
[INFO] [stdout]   |                  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `thread::JoinHandle`
[INFO] [stdout]  --> src/artofmultiprocessor/ch7.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use thread::JoinHandle;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `AtomicBool`, `AtomicUsize`, and `Ordering`
[INFO] [stdout]  --> src/artofmultiprocessor/ch8.rs:1:25
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
[INFO] [stdout]   |                         ^^^^^^^^^^  ^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Cell`, `UnsafeCell`, and `sync::Arc`
[INFO] [stdout]  --> src/artofmultiprocessor/ch8.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 |     cell::{Cell, UnsafeCell},
[INFO] [stdout]   |            ^^^^  ^^^^^^^^^^
[INFO] [stdout] 4 |     sync::Arc,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `thread::JoinHandle`
[INFO] [stdout]  --> src/artofmultiprocessor/ch8.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use thread::JoinHandle;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `AtomicBool`, `AtomicUsize`, and `Ordering`
[INFO] [stdout]  --> src/artofmultiprocessor/ch9.rs:1:25
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
[INFO] [stdout]   |                         ^^^^^^^^^^  ^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Arc`, `Cell`, and `UnsafeCell`
[INFO] [stdout]  --> src/artofmultiprocessor/ch9.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 |     cell::{Cell, UnsafeCell},
[INFO] [stdout]   |            ^^^^  ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 6 |     sync::{Arc, Mutex},
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `thread::JoinHandle`
[INFO] [stdout]  --> src/artofmultiprocessor/ch9.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use thread::JoinHandle;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `realloc`
[INFO] [stdout]  --> src/pointers/simplebox.rs:1:34
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::alloc::{alloc, dealloc, realloc, Layout};
[INFO] [stdout]   |                                  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `fmt::Display`
[INFO] [stdout]  --> src/pointers/simplebox.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     fmt::Display,
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `alloc`, `fmt::Display`, and `rc::Rc`
[INFO] [stdout]  --> src/pointers/simplerc.rs:2:13
[INFO] [stdout]   |
[INFO] [stdout] 2 |     alloc::{alloc, dealloc, Layout},
[INFO] [stdout]   |             ^^^^^
[INFO] [stdout] 3 |     cell::Cell,
[INFO] [stdout] 4 |     fmt::Display,
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 7 |     rc::Rc,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `RefCell`
[INFO] [stdout]  --> src/pointers/simplerefcell.rs:2:18
[INFO] [stdout]   |
[INFO] [stdout] 2 |     cell::{Cell, RefCell, UnsafeCell},
[INFO] [stdout]   |                  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ops::Deref`
[INFO] [stdout]  --> src/datastructures/conslist.rs:1:45
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{fmt::Display, iter::FromIterator, ops::Deref, rc::Rc};
[INFO] [stdout]   |                                             ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `fmt::Display`, `iter::FromIterator`, and `ops::Deref`
[INFO] [stdout]  --> src/datastructures/stack.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{fmt::Display, iter::FromIterator, ops::Deref};
[INFO] [stdout]   |           ^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::artofmultiprocessor::ch2::*`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use crate::artofmultiprocessor::ch2::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::artofmultiprocessor::ch7::*`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use crate::artofmultiprocessor::ch7::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::artofmultiprocessor::ch8::*`
[INFO] [stdout]  --> src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use crate::artofmultiprocessor::ch8::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::artofmultiprocessor::ch9::*`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use crate::artofmultiprocessor::ch9::*;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]   --> src/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use std::thread;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `std::sync::atomic::Atomic::<bool>::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stdout]   --> src/artofmultiprocessor/ch7.rs:19:23
[INFO] [stdout]    |
[INFO] [stdout] 19 |             if self.1.compare_and_swap(false, true, Ordering::SeqCst) {
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `size`
[INFO] [stdout]   --> src/artofmultiprocessor/ch7.rs:96:22
[INFO] [stdout]    |
[INFO] [stdout] 96 |     pub fn new(a: T, size: usize) -> ALock<T> {
[INFO] [stdout]    |                      ^^^^ help: if this is intentional, prefix it with an underscore: `_size`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/artofmultiprocessor/ch9.rs:58:17
[INFO] [stdout]    |
[INFO] [stdout] 58 |             let mut rest = list.head.take();
[INFO] [stdout]    |                 ----^^^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/artofmultiprocessor/ch9.rs:80:13
[INFO] [stdout]    |
[INFO] [stdout] 80 |         let mut vec = vec![];
[INFO] [stdout]    |             ----^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rustdatastructures` (bin "rustdatastructures") due to 1 previous error; 29 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "47cb9abd4ca9a8ad8bca07df8f4e3e3fd0bc4ed2d572322df2e4e3301c8260ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "47cb9abd4ca9a8ad8bca07df8f4e3e3fd0bc4ed2d572322df2e4e3301c8260ab", kill_on_drop: false }`
[INFO] [stdout] 47cb9abd4ca9a8ad8bca07df8f4e3e3fd0bc4ed2d572322df2e4e3301c8260ab
