[INFO] updating cached repository https://github.com/zjjfly/DiveIntoRust
[INFO] running `Command { std: "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", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 877c1bb705bbbb02f97fe5b709a24db219a45d2c
[INFO] testing zjjfly/DiveIntoRust against 1.45.2 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzjjfly%2FDiveIntoRust" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/zjjfly/DiveIntoRust on toolchain 1.45.2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/zjjfly/DiveIntoRust
[INFO] finished tweaking git repo https://github.com/zjjfly/DiveIntoRust
[INFO] tweaked toml for git repo https://github.com/zjjfly/DiveIntoRust written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/zjjfly/DiveIntoRust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 20c5cb14bd4428c140f5c9bfc1210dc48bda8ab9598600c512768ca6fe8a6f62
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "20c5cb14bd4428c140f5c9bfc1210dc48bda8ab9598600c512768ca6fe8a6f62", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "20c5cb14bd4428c140f5c9bfc1210dc48bda8ab9598600c512768ca6fe8a6f62", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "20c5cb14bd4428c140f5c9bfc1210dc48bda8ab9598600c512768ca6fe8a6f62", kill_on_drop: false }`
[INFO] [stdout] 20c5cb14bd4428c140f5c9bfc1210dc48bda8ab9598600c512768ca6fe8a6f62
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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=warn" "-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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3d15d0e9e7717a7129bca827288cb5a0ab0434cfbb8cdd194a97e4bea24a27c1
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "3d15d0e9e7717a7129bca827288cb5a0ab0434cfbb8cdd194a97e4bea24a27c1", kill_on_drop: false }`
[INFO] [stderr]    Compiling dive_into_format v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `add1`
[INFO] [stdout]  --> src/ch4/function.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn add1(t: (i32, i32)) -> i32 {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add2`
[INFO] [stdout]  --> src/ch4/function.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn add2((x, y): (i32, i32)) -> i32 {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `cube`
[INFO] [stdout]   --> src/ch4/function.rs:61:10
[INFO] [stdout]    |
[INFO] [stdout] 61 | const fn cube(num: usize) -> usize {
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]   --> src/ch4/function.rs:60:1
[INFO] [stdout]    |
[INFO] [stdout] 60 | #[feature(const_fn)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate-level attribute should be an inner attribute: add an exclamation mark: `#![foo]`
[INFO] [stdout]   --> src/ch4/function.rs:60:1
[INFO] [stdout]    |
[INFO] [stdout] 60 | #[feature(const_fn)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `err`
[INFO] [stdout]   --> src/main.rs:15:13
[INFO] [stdout]    |
[INFO] [stdout] 15 |         Err(err) => println!("environment variable {} not found!", "SHELL")
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.38s
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "3d15d0e9e7717a7129bca827288cb5a0ab0434cfbb8cdd194a97e4bea24a27c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3d15d0e9e7717a7129bca827288cb5a0ab0434cfbb8cdd194a97e4bea24a27c1", kill_on_drop: false }`
[INFO] [stdout] 3d15d0e9e7717a7129bca827288cb5a0ab0434cfbb8cdd194a97e4bea24a27c1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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=warn" "-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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6aa15653d4d8c5603c7cced57d757f80f5a2fa645c65fc01f68eb133dc856889
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "6aa15653d4d8c5603c7cced57d757f80f5a2fa645c65fc01f68eb133dc856889", kill_on_drop: false }`
[INFO] [stderr]    Compiling dive_into_format v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `add1`
[INFO] [stdout]  --> src/ch4/function.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn add1(t: (i32, i32)) -> i32 {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add2`
[INFO] [stdout]  --> src/ch4/function.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn add2((x, y): (i32, i32)) -> i32 {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `cube`
[INFO] [stdout]   --> src/ch4/function.rs:61:10
[INFO] [stdout]    |
[INFO] [stdout] 61 | const fn cube(num: usize) -> usize {
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]   --> src/ch4/function.rs:60:1
[INFO] [stdout]    |
[INFO] [stdout] 60 | #[feature(const_fn)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate-level attribute should be an inner attribute: add an exclamation mark: `#![foo]`
[INFO] [stdout]   --> src/ch4/function.rs:60:1
[INFO] [stdout]    |
[INFO] [stdout] 60 | #[feature(const_fn)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `err`
[INFO] [stdout]   --> src/main.rs:15:13
[INFO] [stdout]    |
[INFO] [stdout] 15 |         Err(err) => println!("environment variable {} not found!", "SHELL")
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/ch4/function.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let x: i32 = diverges();
[INFO] [stdout]    |                  ---------- any code following this expression is unreachable
[INFO] [stdout] 55 |     let y: String = diverges();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `func`
[INFO] [stdout]   --> src/ch4/function.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let mut func = add1;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_func`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `func` is assigned to, but never used
[INFO] [stdout]   --> src/ch4/function.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let mut func = add1 as fn((i32, i32)) -> i32;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_func` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `func` is never read
[INFO] [stdout]   --> src/ch4/function.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     func = add2;
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `func` is assigned to, but never used
[INFO] [stdout]   --> src/ch4/function.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let mut func: fn((i32, i32)) -> i32 = add1;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_func` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `func` is never read
[INFO] [stdout]   --> src/ch4/function.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     func = add2;
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/ch4/function.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let x: i32 = diverges();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/ch4/function.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let y: String = diverges();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ch4/function.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let mut func = add1;
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]   --> src/ch4/function.rs:60:1
[INFO] [stdout]    |
[INFO] [stdout] 60 | #[feature(const_fn)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate-level attribute should be an inner attribute: add an exclamation mark: `#![foo]`
[INFO] [stdout]   --> src/ch4/function.rs:60:1
[INFO] [stdout]    |
[INFO] [stdout] 60 | #[feature(const_fn)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.06s
[INFO] running `Command { std: "docker" "inspect" "6aa15653d4d8c5603c7cced57d757f80f5a2fa645c65fc01f68eb133dc856889", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6aa15653d4d8c5603c7cced57d757f80f5a2fa645c65fc01f68eb133dc856889", kill_on_drop: false }`
[INFO] [stdout] 6aa15653d4d8c5603c7cced57d757f80f5a2fa645c65fc01f68eb133dc856889
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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=warn" "-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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 147f1f06dea2824cf347006f70144ba7b558248c5e8227fcfd99c52b27eeb94c
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "147f1f06dea2824cf347006f70144ba7b558248c5e8227fcfd99c52b27eeb94c", kill_on_drop: false }`
[INFO] [stderr] warning: function is never used: `add1`
[INFO] [stderr]  --> src/ch4/function.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn add1(t: (i32, i32)) -> i32 {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add2`
[INFO] [stderr]  --> src/ch4/function.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn add2((x, y): (i32, i32)) -> i32 {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `cube`
[INFO] [stderr]   --> src/ch4/function.rs:61:10
[INFO] [stderr]    |
[INFO] [stderr] 61 | const fn cube(num: usize) -> usize {
[INFO] [stderr]    |          ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused attribute
[INFO] [stderr]   --> src/ch4/function.rs:60:1
[INFO] [stderr]    |
[INFO] [stderr] 60 | #[feature(const_fn)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_attributes)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: crate-level attribute should be an inner attribute: add an exclamation mark: `#![foo]`
[INFO] [stderr]   --> src/ch4/function.rs:60:1
[INFO] [stderr]    |
[INFO] [stderr] 60 | #[feature(const_fn)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 5 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]   --> src/ch4/function.rs:55:5
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let x: i32 = diverges();
[INFO] [stderr]    |                  ---------- any code following this expression is unreachable
[INFO] [stderr] 55 |     let y: String = diverges();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `func`
[INFO] [stderr]   --> src/ch4/function.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let mut func = add1;
[INFO] [stderr]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_func`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `func` is assigned to, but never used
[INFO] [stderr]   --> src/ch4/function.rs:22:9
[INFO] [stderr]    |
[INFO] [stderr] 22 |     let mut func = add1 as fn((i32, i32)) -> i32;
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_func` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `func` is never read
[INFO] [stderr]   --> src/ch4/function.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     func = add2;
[INFO] [stderr]    |     ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `func` is assigned to, but never used
[INFO] [stderr]   --> src/ch4/function.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 |     let mut func: fn((i32, i32)) -> i32 = add1;
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_func` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `func` is never read
[INFO] [stderr]   --> src/ch4/function.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 |     func = add2;
[INFO] [stderr]    |     ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/ch4/function.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let x: i32 = diverges();
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/ch4/function.rs:55:9
[INFO] [stderr]    |
[INFO] [stderr] 55 |     let y: String = diverges();
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ch4/function.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let mut func = add1;
[INFO] [stderr]    |         ----^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused attribute
[INFO] [stderr]   --> src/ch4/function.rs:60:1
[INFO] [stderr]    |
[INFO] [stderr] 60 | #[feature(const_fn)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_attributes)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `err`
[INFO] [stderr]   --> src/main.rs:15:13
[INFO] [stderr]    |
[INFO] [stderr] 15 |         Err(err) => println!("environment variable {} not found!", "SHELL")
[INFO] [stderr]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: crate-level attribute should be an inner attribute: add an exclamation mark: `#![foo]`
[INFO] [stderr]   --> src/ch4/function.rs:60:1
[INFO] [stderr]    |
[INFO] [stderr] 60 | #[feature(const_fn)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 11 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/dive_into_format-1107fc5746719ee6
[INFO] [stdout] running 27 tests
[INFO] [stdout] test ch2::variable::test_type_alias ... ok
[INFO] [stdout] test ch2::variable::test_const_var ... ok
[INFO] [stdout] test ch2::data_type::test_char ... ok
[INFO] [stdout] test ch2::data_type::test_float ... ok
[INFO] [stdout] test ch2::variable::test_static_var ... ok
[INFO] [stdout] test ch2::complex_type::test_tuple ... ok
[INFO] [stdout] test ch2::complex_type::test_struct ... ok
[INFO] [stdout] test ch2::data_type::test_overflow ... ok
[INFO] [stdout] test ch3::expression::test_assignment ... ok
[INFO] [stdout] test ch2::data_type::test_integer ... ok
[INFO] [stdout] test ch3::expression::test_for ... ok
[INFO] [stdout] test ch2::variable::test_variable_declare ... ok
[INFO] [stdout] test ch2::data_type::test_type_convert ... ok
[INFO] [stdout] test ch3::expression::test_if_else ... ok
[INFO] [stdout] test ch3::expression::test_arithmetic_exp ... ok
[INFO] [stdout] test ch2::complex_type::test_type_recur ... ok
[INFO] [stdout] test ch2::complex_type::test_enum ... ok
[INFO] [stdout] test ch4::function::test_recursive ... ok
[INFO] [stdout] test ch4::function::test_const_fn ... ok
[INFO] [stdout] test ch4::function::test_inner ... ok
[INFO] [stdout] test ch2::complex_type::test_tuple_struct ... ok
[INFO] [stdout] test ch3::expression::test_while ... ok
[INFO] [stdout] test ch4::function::test_invoke ... ok
[INFO] [stdout] test ch4::function::test_type ... ok
[INFO] [stdout] test ch1::format::test_format_string ... FAILED
[INFO] [stdout] test ch4::function::test_diverge ... FAILED
[INFO] [stdout] test ch3::expression::test_loop ... test ch3::expression::test_loop has been running for over 60 seconds
[ERROR] error running command: no output for 300 seconds
[INFO] running `Command { std: "docker" "inspect" "147f1f06dea2824cf347006f70144ba7b558248c5e8227fcfd99c52b27eeb94c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "147f1f06dea2824cf347006f70144ba7b558248c5e8227fcfd99c52b27eeb94c", kill_on_drop: false }`
[INFO] [stdout] 147f1f06dea2824cf347006f70144ba7b558248c5e8227fcfd99c52b27eeb94c