[INFO] cloning repository https://github.com/LiWenGu/learing-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/LiWenGu/learing-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLiWenGu%2Flearing-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLiWenGu%2Flearing-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1018016a1d796e913f4132017e0b754036fa4939
[INFO] building LiWenGu/learing-rust against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLiWenGu%2Flearing-rust" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/LiWenGu/learing-rust on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/LiWenGu/learing-rust
[INFO] finished tweaking git repo https://github.com/LiWenGu/learing-rust
[INFO] tweaked toml for git repo https://github.com/LiWenGu/learing-rust written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/LiWenGu/learing-rust 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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 020b36bba7bc6283e1f6f17bc1e7aa0ed0cbcf7b421b2caf2d15c7610d091d6b
[INFO] running `Command { std: "docker" "start" "-a" "020b36bba7bc6283e1f6f17bc1e7aa0ed0cbcf7b421b2caf2d15c7610d091d6b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "020b36bba7bc6283e1f6f17bc1e7aa0ed0cbcf7b421b2caf2d15c7610d091d6b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "020b36bba7bc6283e1f6f17bc1e7aa0ed0cbcf7b421b2caf2d15c7610d091d6b", kill_on_drop: false }`
[INFO] [stdout] 020b36bba7bc6283e1f6f17bc1e7aa0ed0cbcf7b421b2caf2d15c7610d091d6b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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 -Dtail-expr-drop-order" "-e" "RUSTDOCFLAGS=--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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d804406e77fcdc883274f1128ccf01ef2566fdd15334238f6ad393a6aa5b5891
[INFO] running `Command { std: "docker" "start" "-a" "d804406e77fcdc883274f1128ccf01ef2566fdd15334238f6ad393a6aa5b5891", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling hello_macro v0.1.0 (/opt/rustwide/workdir/hello_macro)
[INFO] [stderr]    Compiling intelligent-point v0.1.0 (/opt/rustwide/workdir/intelligent-point)
[INFO] [stderr]    Compiling object-feature v0.1.0 (/opt/rustwide/workdir/object-feature)
[INFO] [stderr]    Compiling web v0.1.0 (/opt/rustwide/workdir/web)
[INFO] [stderr]    Compiling advance-feature v0.1.0 (/opt/rustwide/workdir/advance-feature)
[INFO] [stderr]    Compiling fearless-concurrent v0.1.0 (/opt/rustwide/workdir/fearless-concurrent)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> web/src/lib.rs:4:16
[INFO] [stdout]   |
[INFO] [stdout] 4 | type Job = Box<FnBox + Send + 'static>;
[INFO] [stdout]   |                ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]   |
[INFO] [stdout] 4 | type Job = Box<dyn FnBox + Send + 'static>;
[INFO] [stdout]   |                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> intelligent-point/src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]    --> object-feature/src/lib.rs:180:27
[INFO] [stdout]     |
[INFO] [stdout] 180 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]     |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `split_at_mut` is never used
[INFO] [stdout]   --> advance-feature/src/main.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn split_at_mut(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Red` is never used
[INFO] [stdout]   --> advance-feature/src/main.rs:31:7
[INFO] [stdout]    |
[INFO] [stdout] 31 | trait Red {}
[INFO] [stdout]    |       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Ball` is never constructed
[INFO] [stdout]   --> advance-feature/src/main.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct Ball<'a> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `baby_name` is never used
[INFO] [stdout]   --> advance-feature/src/main.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 45 | impl Dog {
[INFO] [stdout]    | -------- associated function in this implementation
[INFO] [stdout] 46 |     fn baby_name() -> String {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SelectBox` is never constructed
[INFO] [stdout]   --> object-feature/src/lib.rs:59:8
[INFO] [stdout]    |
[INFO] [stdout] 59 | struct SelectBox {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `MutexExample` should have a snake case name
[INFO] [stdout]   --> fearless-concurrent/src/main.rs:85:4
[INFO] [stdout]    |
[INFO] [stdout] 85 | fn MutexExample() {
[INFO] [stdout]    |    ^^^^^^^^^^^^ help: convert the identifier to snake case: `mutex_example`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]  --> intelligent-point/src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let list = Cons(1,
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> intelligent-point/src/main.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let c = CustomSmartPointer {data: String::from("my stuff")};
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]   --> intelligent-point/src/main.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let d = CustomSmartPointer {data: String::from("other stuff")};
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> intelligent-point/src/main.rs:37:10
[INFO] [stdout]    |
[INFO] [stdout] 37 |     Cons(i32, Box<List>),
[INFO] [stdout]    |     ---- ^^^  ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 37 |     Cons((), ()),
[INFO] [stdout]    |          ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Listz` is never used
[INFO] [stdout]   --> intelligent-point/src/main.rs:67:6
[INFO] [stdout]    |
[INFO] [stdout] 67 | enum Listz {
[INFO] [stdout]    |      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> intelligent-point/src/main.rs:74:10
[INFO] [stdout]    |
[INFO] [stdout] 74 |     Cons(Rc<RefCell<i32>>, Rc<Lists>),
[INFO] [stdout]    |     ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Lists` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 74 |     Cons((), ()),
[INFO] [stdout]    |          ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `thread`
[INFO] [stdout]  --> web/src/main.rs:3:15
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{fs, thread};
[INFO] [stdout]   |               ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling add-one v0.1.0 (/opt/rustwide/workdir/add-one)
[INFO] [stderr]    Compiling adder v0.1.0 (/opt/rustwide/workdir/adder)
[INFO] [stdout] warning: unused import: `rand`
[INFO] [stdout]  --> adder/src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use rand;
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling hello_macro_derive v0.1.0 (/opt/rustwide/workdir/hello_macro/hello_macro_derive)
[INFO] [stderr]    Compiling pancakes v0.1.0 (/opt/rustwide/workdir/pancakes)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.55s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: syn v0.14.9
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "d804406e77fcdc883274f1128ccf01ef2566fdd15334238f6ad393a6aa5b5891", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d804406e77fcdc883274f1128ccf01ef2566fdd15334238f6ad393a6aa5b5891", kill_on_drop: false }`
[INFO] [stdout] d804406e77fcdc883274f1128ccf01ef2566fdd15334238f6ad393a6aa5b5891
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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 -Dtail-expr-drop-order" "-e" "RUSTDOCFLAGS=--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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 832c7a402b3414956880aa9f784d60331616e0d5a964404ffde5a0073f6ac077
[INFO] running `Command { std: "docker" "start" "-a" "832c7a402b3414956880aa9f784d60331616e0d5a964404ffde5a0073f6ac077", kill_on_drop: false }`
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> intelligent-point/src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]    --> object-feature/src/lib.rs:180:27
[INFO] [stdout]     |
[INFO] [stdout] 180 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]     |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SelectBox` is never constructed
[INFO] [stdout]   --> object-feature/src/lib.rs:59:8
[INFO] [stdout]    |
[INFO] [stdout] 59 | struct SelectBox {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> web/src/lib.rs:4:16
[INFO] [stdout]   |
[INFO] [stdout] 4 | type Job = Box<FnBox + Send + 'static>;
[INFO] [stdout]   |                ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]   |
[INFO] [stdout] 4 | type Job = Box<dyn FnBox + Send + 'static>;
[INFO] [stdout]   |                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling web v0.1.0 (/opt/rustwide/workdir/web)
[INFO] [stderr]    Compiling advance-feature v0.1.0 (/opt/rustwide/workdir/advance-feature)
[INFO] [stderr]    Compiling intelligent-point v0.1.0 (/opt/rustwide/workdir/intelligent-point)
[INFO] [stderr]    Compiling fearless-concurrent v0.1.0 (/opt/rustwide/workdir/fearless-concurrent)
[INFO] [stderr]    Compiling hello_macro v0.1.0 (/opt/rustwide/workdir/hello_macro)
[INFO] [stderr]    Compiling object-feature v0.1.0 (/opt/rustwide/workdir/object-feature)
[INFO] [stderr]    Compiling hello_macro_derive v0.1.0 (/opt/rustwide/workdir/hello_macro/hello_macro_derive)
[INFO] [stderr]    Compiling add-one v0.1.0 (/opt/rustwide/workdir/add-one)
[INFO] [stderr]    Compiling adder v0.1.0 (/opt/rustwide/workdir/adder)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> web/src/lib.rs:4:16
[INFO] [stdout]   |
[INFO] [stdout] 4 | type Job = Box<FnBox + Send + 'static>;
[INFO] [stdout]   |                ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]   |
[INFO] [stdout] 4 | type Job = Box<dyn FnBox + Send + 'static>;
[INFO] [stdout]   |                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> intelligent-point/src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `thread`
[INFO] [stdout]  --> web/src/main.rs:3:15
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{fs, thread};
[INFO] [stdout]   |               ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand`
[INFO] [stdout]  --> adder/src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use rand;
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `split_at_mut` is never used
[INFO] [stdout]   --> advance-feature/src/main.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn split_at_mut(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Red` is never used
[INFO] [stdout]   --> advance-feature/src/main.rs:31:7
[INFO] [stdout]    |
[INFO] [stdout] 31 | trait Red {}
[INFO] [stdout]    |       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Ball` is never constructed
[INFO] [stdout]   --> advance-feature/src/main.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct Ball<'a> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `baby_name` is never used
[INFO] [stdout]   --> advance-feature/src/main.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 45 | impl Dog {
[INFO] [stdout]    | -------- associated function in this implementation
[INFO] [stdout] 46 |     fn baby_name() -> String {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]    --> object-feature/src/lib.rs:180:27
[INFO] [stdout]     |
[INFO] [stdout] 180 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]     |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SelectBox` is never constructed
[INFO] [stdout]   --> object-feature/src/lib.rs:59:8
[INFO] [stdout]    |
[INFO] [stdout] 59 | struct SelectBox {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]  --> intelligent-point/src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let list = Cons(1,
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> intelligent-point/src/main.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let c = CustomSmartPointer {data: String::from("my stuff")};
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]   --> intelligent-point/src/main.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let d = CustomSmartPointer {data: String::from("other stuff")};
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> intelligent-point/src/main.rs:37:10
[INFO] [stdout]    |
[INFO] [stdout] 37 |     Cons(i32, Box<List>),
[INFO] [stdout]    |     ---- ^^^  ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 37 |     Cons((), ()),
[INFO] [stdout]    |          ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Listz` is never used
[INFO] [stdout]   --> intelligent-point/src/main.rs:67:6
[INFO] [stdout]    |
[INFO] [stdout] 67 | enum Listz {
[INFO] [stdout]    |      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> intelligent-point/src/main.rs:74:10
[INFO] [stdout]    |
[INFO] [stdout] 74 |     Cons(Rc<RefCell<i32>>, Rc<Lists>),
[INFO] [stdout]    |     ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Lists` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 74 |     Cons((), ()),
[INFO] [stdout]    |          ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `MutexExample` should have a snake case name
[INFO] [stdout]   --> fearless-concurrent/src/main.rs:85:4
[INFO] [stdout]    |
[INFO] [stdout] 85 | fn MutexExample() {
[INFO] [stdout]    |    ^^^^^^^^^^^^ help: convert the identifier to snake case: `mutex_example`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling pancakes v0.1.0 (/opt/rustwide/workdir/pancakes)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.36s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: syn v0.14.9
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "832c7a402b3414956880aa9f784d60331616e0d5a964404ffde5a0073f6ac077", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "832c7a402b3414956880aa9f784d60331616e0d5a964404ffde5a0073f6ac077", kill_on_drop: false }`
[INFO] [stdout] 832c7a402b3414956880aa9f784d60331616e0d5a964404ffde5a0073f6ac077