[INFO] cloning repository https://github.com/ai-chen2050/Learning-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ai-chen2050/Learning-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fai-chen2050%2FLearning-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fai-chen2050%2FLearning-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] eddcc25643a944ceccece8a8addd7cace3c02518
[INFO] checking ai-chen2050/Learning-rust against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fai-chen2050%2FLearning-rust" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ai-chen2050/Learning-rust on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ai-chen2050/Learning-rust
[INFO] finished tweaking git repo https://github.com/ai-chen2050/Learning-rust
[INFO] tweaked toml for git repo https://github.com/ai-chen2050/Learning-rust written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/ai-chen2050/Learning-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded backtrace v0.3.70
[INFO] [stderr]   Downloaded stopwatch v0.0.7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3fdd40c3aeb0ff3c77b903044b7f02119a36c33da68579e8b46dc3a2ab001a8e
[INFO] running `Command { std: "docker" "start" "-a" "3fdd40c3aeb0ff3c77b903044b7f02119a36c33da68579e8b46dc3a2ab001a8e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3fdd40c3aeb0ff3c77b903044b7f02119a36c33da68579e8b46dc3a2ab001a8e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3fdd40c3aeb0ff3c77b903044b7f02119a36c33da68579e8b46dc3a2ab001a8e", kill_on_drop: false }`
[INFO] [stdout] 3fdd40c3aeb0ff3c77b903044b7f02119a36c33da68579e8b46dc3a2ab001a8e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7f4e03014171354190b2a2909abde83dff138dfbb12afbc041960d64580e1e42
[INFO] running `Command { std: "docker" "start" "-a" "7f4e03014171354190b2a2909abde83dff138dfbb12afbc041960d64580e1e42", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]     Checking rustc-serialize v0.3.25
[INFO] [stderr]    Compiling self-hello v0.1.0 (/opt/rustwide/workdir/pro/attri-hello)
[INFO] [stderr]    Compiling num-traits v0.2.18
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]    Compiling syn v2.0.53
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking num-integer v0.1.46
[INFO] [stderr]     Checking num-iter v0.1.44
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking stopwatch v0.0.7
[INFO] [stderr]     Checking lang v0.1.0 (/opt/rustwide/workdir/lang)
[INFO] [stdout] warning: unused import: `Duration`
[INFO] [stdout]  --> lang/src/thread.rs:4:17
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::time::{Duration,SystemTime};
[INFO] [stdout]   |                 ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rng` is imported redundantly
[INFO] [stdout]    --> lang/src/base.rs:201:9
[INFO] [stdout]     |
[INFO] [stdout] 4   | use rand::Rng;
[INFO] [stdout]     |     --------- the item `Rng` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 201 |     use rand::Rng;
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rng` is imported redundantly
[INFO] [stdout]    --> lang/src/base.rs:201:9
[INFO] [stdout]     |
[INFO] [stdout] 4   | use rand::Rng;
[INFO] [stdout]     |     --------- the item `Rng` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 201 |     use rand::Rng;
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Duration`
[INFO] [stdout]  --> lang/src/thread.rs:4:17
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::time::{Duration,SystemTime};
[INFO] [stdout]   |                 ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> lang/src/thread.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct Circle {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 34 |     x: f64,
[INFO] [stdout]    |     ^
[INFO] [stdout] 35 |     y: f64,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Circle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]   --> lang/src/thread.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn foo<T: Debug>(s: T) {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo1` is never used
[INFO] [stdout]   --> lang/src/thread.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn foo1<T:Debug + Clone>(s: T) {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `clone` that must be used
[INFO] [stdout]   --> lang/src/thread.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 55 |     s.clone();
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: cloning is often expensive and is not expected to have side effects
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let _ = s.clone();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::Rng`
[INFO] [stdout]  --> lang/src/base.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rand::Rng;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> lang/src/thread.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct Circle {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 34 |     x: f64,
[INFO] [stdout]    |     ^
[INFO] [stdout] 35 |     y: f64,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Circle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]   --> lang/src/thread.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn foo<T: Debug>(s: T) {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo1` is never used
[INFO] [stdout]   --> lang/src/thread.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn foo1<T:Debug + Clone>(s: T) {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> lang/src/base.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 76 |     let mut x: i32 = 5;
[INFO] [stdout]    |             ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `clone` that must be used
[INFO] [stdout]   --> lang/src/thread.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 55 |     s.clone();
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: cloning is often expensive and is not expected to have side effects
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let _ = s.clone();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `w`
[INFO] [stdout]   --> lang/src/base.rs:87:10
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let (w,z) = (3, "hello,chen");
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_w`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> lang/src/base.rs:87:12
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let (w,z) = (3, "hello,chen");
[INFO] [stdout]    |            ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str1`
[INFO] [stdout]   --> lang/src/base.rs:91:10
[INFO] [stdout]    |
[INFO] [stdout] 91 |     let  str1 = "hello,world !";
[INFO] [stdout]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_str1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str2`
[INFO] [stdout]   --> lang/src/base.rs:92:9
[INFO] [stdout]    |
[INFO] [stdout] 92 |     let str2 : &str = "This is rust's trait";
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_str2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str3`
[INFO] [stdout]   --> lang/src/base.rs:93:9
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let str3 = String::from("hello,world2");
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_str3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `array2`
[INFO] [stdout]   --> lang/src/base.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |     let array2 : [i32;2] = [4, 5];
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_array2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> lang/src/base.rs:100:9
[INFO] [stdout]     |
[INFO] [stdout] 100 |     let s :usize = array1.len();    // s == 3
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]    --> lang/src/base.rs:101:9
[INFO] [stdout]     |
[INFO] [stdout] 101 |     let e = array1[1];
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `vec1`
[INFO] [stdout]    --> lang/src/base.rs:102:9
[INFO] [stdout]     |
[INFO] [stdout] 102 |     let vec1 = vec![1, 2, 3];
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_vec1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> lang/src/base.rs:103:9
[INFO] [stdout]     |
[INFO] [stdout] 103 |     let y: Vec<i32> = [4, 5, 6].to_vec();
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> lang/src/base.rs:106:9
[INFO] [stdout]     |
[INFO] [stdout] 106 |     let x = (5, '6');
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z0`
[INFO] [stdout]    --> lang/src/base.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |     let z0 = y.0;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_z0`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z1`
[INFO] [stdout]    --> lang/src/base.rs:109:9
[INFO] [stdout]     |
[INFO] [stdout] 109 |     let z1 = y.1;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_z1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> lang/src/base.rs:122:9
[INFO] [stdout]     |
[INFO] [stdout] 122 |     let y = if x == '5' { 5 } else if x == '6' { 6 } else { -1 };
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> lang/src/base.rs:145:9
[INFO] [stdout]     |
[INFO] [stdout] 145 |     let y = x;   // the resource assigned to x is move to y
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `red`
[INFO] [stdout]    --> lang/src/base.rs:169:9
[INFO] [stdout]     |
[INFO] [stdout] 169 |     let red = Color::Red;
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_red`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `blue`
[INFO] [stdout]    --> lang/src/base.rs:170:9
[INFO] [stdout]     |
[INFO] [stdout] 170 |     let blue :Color = Color::Blue;
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_blue`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> lang/src/base.rs:186:9
[INFO] [stdout]     |
[INFO] [stdout] 186 |     let c = shape::Circle{
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c2`
[INFO] [stdout]    --> lang/src/base.rs:192:9
[INFO] [stdout]     |
[INFO] [stdout] 192 |     let c2 = Circle{
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_c2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Green` is never constructed
[INFO] [stdout]   --> lang/src/base.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | enum Color {
[INFO] [stdout]    |      ----- variant in this enum
[INFO] [stdout] 37 |     Red,
[INFO] [stdout] 38 |     Green,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `width` and `height` are never read
[INFO] [stdout]   --> lang/src/base.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct Rectangle {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 44 |     width: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 45 |     height: u32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `center` and `radius` are never read
[INFO] [stdout]  --> lang/src/shape/mod.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub struct Circle{
[INFO] [stdout]   |            ------ fields in this struct
[INFO] [stdout] 3 |     pub center: (i32, i32),
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout] 4 |     pub radius: u32,
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `area`, and `move_to` are never used
[INFO] [stdout]   --> lang/src/shape/mod.rs:8:8
[INFO] [stdout]    |
[INFO] [stdout] 7  | impl Circle {
[INFO] [stdout]    | ----------- associated items in this implementation
[INFO] [stdout] 8  |     fn new(center: (i32, i32), radius: u32) -> Circle {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     fn area(&self) -> f64 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     fn move_to(&mut self, new_center: (i32, i32)) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 26 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling tokio-macros v2.2.0
[INFO] [stdout] warning: unused import: `rand::Rng`
[INFO] [stdout]  --> lang/src/base.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rand::Rng;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> lang/src/base.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 76 |     let mut x: i32 = 5;
[INFO] [stdout]    |             ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `w`
[INFO] [stdout]   --> lang/src/base.rs:87:10
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let (w,z) = (3, "hello,chen");
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_w`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> lang/src/base.rs:87:12
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let (w,z) = (3, "hello,chen");
[INFO] [stdout]    |            ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str1`
[INFO] [stdout]   --> lang/src/base.rs:91:10
[INFO] [stdout]    |
[INFO] [stdout] 91 |     let  str1 = "hello,world !";
[INFO] [stdout]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_str1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str2`
[INFO] [stdout]   --> lang/src/base.rs:92:9
[INFO] [stdout]    |
[INFO] [stdout] 92 |     let str2 : &str = "This is rust's trait";
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_str2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str3`
[INFO] [stdout]   --> lang/src/base.rs:93:9
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let str3 = String::from("hello,world2");
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_str3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `array2`
[INFO] [stdout]   --> lang/src/base.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |     let array2 : [i32;2] = [4, 5];
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_array2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> lang/src/base.rs:100:9
[INFO] [stdout]     |
[INFO] [stdout] 100 |     let s :usize = array1.len();    // s == 3
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]    --> lang/src/base.rs:101:9
[INFO] [stdout]     |
[INFO] [stdout] 101 |     let e = array1[1];
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `vec1`
[INFO] [stdout]    --> lang/src/base.rs:102:9
[INFO] [stdout]     |
[INFO] [stdout] 102 |     let vec1 = vec![1, 2, 3];
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_vec1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> lang/src/base.rs:103:9
[INFO] [stdout]     |
[INFO] [stdout] 103 |     let y: Vec<i32> = [4, 5, 6].to_vec();
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> lang/src/base.rs:106:9
[INFO] [stdout]     |
[INFO] [stdout] 106 |     let x = (5, '6');
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z0`
[INFO] [stdout]    --> lang/src/base.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |     let z0 = y.0;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_z0`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z1`
[INFO] [stdout]    --> lang/src/base.rs:109:9
[INFO] [stdout]     |
[INFO] [stdout] 109 |     let z1 = y.1;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_z1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> lang/src/base.rs:122:9
[INFO] [stdout]     |
[INFO] [stdout] 122 |     let y = if x == '5' { 5 } else if x == '6' { 6 } else { -1 };
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> lang/src/base.rs:145:9
[INFO] [stdout]     |
[INFO] [stdout] 145 |     let y = x;   // the resource assigned to x is move to y
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `red`
[INFO] [stdout]    --> lang/src/base.rs:169:9
[INFO] [stdout]     |
[INFO] [stdout] 169 |     let red = Color::Red;
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_red`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `blue`
[INFO] [stdout]    --> lang/src/base.rs:170:9
[INFO] [stdout]     |
[INFO] [stdout] 170 |     let blue :Color = Color::Blue;
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_blue`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> lang/src/base.rs:186:9
[INFO] [stdout]     |
[INFO] [stdout] 186 |     let c = shape::Circle{
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c2`
[INFO] [stdout]    --> lang/src/base.rs:192:9
[INFO] [stdout]     |
[INFO] [stdout] 192 |     let c2 = Circle{
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_c2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Green` is never constructed
[INFO] [stdout]   --> lang/src/base.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | enum Color {
[INFO] [stdout]    |      ----- variant in this enum
[INFO] [stdout] 37 |     Red,
[INFO] [stdout] 38 |     Green,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `width` and `height` are never read
[INFO] [stdout]   --> lang/src/base.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct Rectangle {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 44 |     width: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 45 |     height: u32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `center` and `radius` are never read
[INFO] [stdout]  --> lang/src/shape/mod.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub struct Circle{
[INFO] [stdout]   |            ------ fields in this struct
[INFO] [stdout] 3 |     pub center: (i32, i32),
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout] 4 |     pub radius: u32,
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `area`, and `move_to` are never used
[INFO] [stdout]   --> lang/src/shape/mod.rs:8:8
[INFO] [stdout]    |
[INFO] [stdout] 7  | impl Circle {
[INFO] [stdout]    | ----------- associated items in this implementation
[INFO] [stdout] 8  |     fn new(center: (i32, i32), radius: u32) -> Circle {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     fn area(&self) -> f64 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     fn move_to(&mut self, new_center: (i32, i32)) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 26 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking tokio v1.36.0
[INFO] [stderr]     Checking self-learning v0.1.0 (/opt/rustwide/workdir/pro/attri-hello-call)
[INFO] [stdout] println!("Hello, Greet");
[INFO] [stdout] attr: "bar"
[INFO] [stdout] item: "fn invoke1() {}"
[INFO] [stdout] fn: "fn prt1() { println!("Hello, greet2!"); }"
[INFO] [stdout] fn: "fn prt2() { println!("Hello, greet2!"); }"
[INFO] [stdout] println!("Hello, Greet");
[INFO] [stdout] attr: "bar"
[INFO] [stdout] item: "fn invoke1() {}"
[INFO] [stdout] fn: "fn prt1() { println!("Hello, greet2!"); }"
[INFO] [stdout] fn: "fn prt2() { println!("Hello, greet2!"); }"
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.63s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: num-bigint v0.1.44, num-complex v0.1.43, num-rational v0.1.42
[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" "7f4e03014171354190b2a2909abde83dff138dfbb12afbc041960d64580e1e42", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7f4e03014171354190b2a2909abde83dff138dfbb12afbc041960d64580e1e42", kill_on_drop: false }`
[INFO] [stdout] 7f4e03014171354190b2a2909abde83dff138dfbb12afbc041960d64580e1e42
[INFO] checking ai-chen2050/Learning-rust against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fai-chen2050%2FLearning-rust" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ai-chen2050/Learning-rust on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ai-chen2050/Learning-rust
[INFO] finished tweaking git repo https://github.com/ai-chen2050/Learning-rust
[INFO] tweaked toml for git repo https://github.com/ai-chen2050/Learning-rust written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/ai-chen2050/Learning-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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fdceec95dc13d9940ac1872837c500eb439176eb0863b591fb04ce1b6b262613
[INFO] running `Command { std: "docker" "start" "-a" "fdceec95dc13d9940ac1872837c500eb439176eb0863b591fb04ce1b6b262613", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fdceec95dc13d9940ac1872837c500eb439176eb0863b591fb04ce1b6b262613", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fdceec95dc13d9940ac1872837c500eb439176eb0863b591fb04ce1b6b262613", kill_on_drop: false }`
[INFO] [stdout] fdceec95dc13d9940ac1872837c500eb439176eb0863b591fb04ce1b6b262613
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ee2ee20c5d79dc81e86e77f598bca0135c6095c2e0d49c241bc22c5afb61d1e0
[INFO] running `Command { std: "docker" "start" "-a" "ee2ee20c5d79dc81e86e77f598bca0135c6095c2e0d49c241bc22c5afb61d1e0", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]     Checking rustc-serialize v0.3.25
[INFO] [stderr]    Compiling self-hello v0.1.0 (/opt/rustwide/workdir/pro/attri-hello)
[INFO] [stderr]    Compiling num-traits v0.2.18
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]    Compiling syn v2.0.53
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking num-integer v0.1.46
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]     Checking num-iter v0.1.44
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking stopwatch v0.0.7
[INFO] [stderr]     Checking lang v0.1.0 (/opt/rustwide/workdir/lang)
[INFO] [stdout] warning: unused import: `Duration`
[INFO] [stdout]  --> lang/src/thread.rs:4:17
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::time::{Duration,SystemTime};
[INFO] [stdout]   |                 ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> lang/src/thread.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct Circle {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 34 |     x: f64,
[INFO] [stdout]    |     ^
[INFO] [stdout] 35 |     y: f64,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Circle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rng` is imported redundantly
[INFO] [stdout]    --> lang/src/base.rs:201:9
[INFO] [stdout]     |
[INFO] [stdout] 4   | use rand::Rng;
[INFO] [stdout]     |     --------- the item `Rng` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 201 |     use rand::Rng;
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]   --> lang/src/thread.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn foo<T: Debug>(s: T) {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo1` is never used
[INFO] [stdout]   --> lang/src/thread.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn foo1<T:Debug + Clone>(s: T) {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rng` is imported redundantly
[INFO] [stdout]    --> lang/src/base.rs:201:9
[INFO] [stdout]     |
[INFO] [stdout] 4   | use rand::Rng;
[INFO] [stdout]     |     --------- the item `Rng` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 201 |     use rand::Rng;
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Duration`
[INFO] [stdout]  --> lang/src/thread.rs:4:17
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::time::{Duration,SystemTime};
[INFO] [stdout]   |                 ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `clone` that must be used
[INFO] [stdout]   --> lang/src/thread.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 55 |     s.clone();
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: cloning is often expensive and is not expected to have side effects
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let _ = s.clone();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::Rng`
[INFO] [stdout]  --> lang/src/base.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rand::Rng;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::Rng`
[INFO] [stdout]  --> lang/src/base.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rand::Rng;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> lang/src/base.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 76 |     let mut x: i32 = 5;
[INFO] [stdout]    |             ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> lang/src/base.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 76 |     let mut x: i32 = 5;
[INFO] [stdout]    |             ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `w`
[INFO] [stdout]   --> lang/src/base.rs:87:10
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let (w,z) = (3, "hello,chen");
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_w`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> lang/src/base.rs:87:12
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let (w,z) = (3, "hello,chen");
[INFO] [stdout]    |            ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str1`
[INFO] [stdout]   --> lang/src/base.rs:91:10
[INFO] [stdout]    |
[INFO] [stdout] 91 |     let  str1 = "hello,world !";
[INFO] [stdout]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_str1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str2`
[INFO] [stdout]   --> lang/src/base.rs:92:9
[INFO] [stdout]    |
[INFO] [stdout] 92 |     let str2 : &str = "This is rust's trait";
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_str2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str3`
[INFO] [stdout]   --> lang/src/base.rs:93:9
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let str3 = String::from("hello,world2");
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_str3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `array2`
[INFO] [stdout]   --> lang/src/base.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |     let array2 : [i32;2] = [4, 5];
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_array2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> lang/src/base.rs:100:9
[INFO] [stdout]     |
[INFO] [stdout] 100 |     let s :usize = array1.len();    // s == 3
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]    --> lang/src/base.rs:101:9
[INFO] [stdout]     |
[INFO] [stdout] 101 |     let e = array1[1];
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `vec1`
[INFO] [stdout]    --> lang/src/base.rs:102:9
[INFO] [stdout]     |
[INFO] [stdout] 102 |     let vec1 = vec![1, 2, 3];
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_vec1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> lang/src/base.rs:103:9
[INFO] [stdout]     |
[INFO] [stdout] 103 |     let y: Vec<i32> = [4, 5, 6].to_vec();
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> lang/src/base.rs:106:9
[INFO] [stdout]     |
[INFO] [stdout] 106 |     let x = (5, '6');
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z0`
[INFO] [stdout]    --> lang/src/base.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |     let z0 = y.0;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_z0`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z1`
[INFO] [stdout]    --> lang/src/base.rs:109:9
[INFO] [stdout]     |
[INFO] [stdout] 109 |     let z1 = y.1;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_z1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> lang/src/base.rs:122:9
[INFO] [stdout]     |
[INFO] [stdout] 122 |     let y = if x == '5' { 5 } else if x == '6' { 6 } else { -1 };
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> lang/src/base.rs:145:9
[INFO] [stdout]     |
[INFO] [stdout] 145 |     let y = x;   // the resource assigned to x is move to y
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `w`
[INFO] [stdout]   --> lang/src/base.rs:87:10
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let (w,z) = (3, "hello,chen");
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_w`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> lang/src/base.rs:87:12
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let (w,z) = (3, "hello,chen");
[INFO] [stdout]    |            ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str1`
[INFO] [stdout]   --> lang/src/base.rs:91:10
[INFO] [stdout]    |
[INFO] [stdout] 91 |     let  str1 = "hello,world !";
[INFO] [stdout]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_str1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str2`
[INFO] [stdout]   --> lang/src/base.rs:92:9
[INFO] [stdout]    |
[INFO] [stdout] 92 |     let str2 : &str = "This is rust's trait";
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_str2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str3`
[INFO] [stdout]   --> lang/src/base.rs:93:9
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let str3 = String::from("hello,world2");
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_str3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `array2`
[INFO] [stdout]   --> lang/src/base.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |     let array2 : [i32;2] = [4, 5];
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_array2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> lang/src/base.rs:100:9
[INFO] [stdout]     |
[INFO] [stdout] 100 |     let s :usize = array1.len();    // s == 3
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]    --> lang/src/base.rs:101:9
[INFO] [stdout]     |
[INFO] [stdout] 101 |     let e = array1[1];
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `vec1`
[INFO] [stdout]    --> lang/src/base.rs:102:9
[INFO] [stdout]     |
[INFO] [stdout] 102 |     let vec1 = vec![1, 2, 3];
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_vec1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> lang/src/base.rs:103:9
[INFO] [stdout]     |
[INFO] [stdout] 103 |     let y: Vec<i32> = [4, 5, 6].to_vec();
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> lang/src/base.rs:106:9
[INFO] [stdout]     |
[INFO] [stdout] 106 |     let x = (5, '6');
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z0`
[INFO] [stdout]    --> lang/src/base.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |     let z0 = y.0;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_z0`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z1`
[INFO] [stdout]    --> lang/src/base.rs:109:9
[INFO] [stdout]     |
[INFO] [stdout] 109 |     let z1 = y.1;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_z1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> lang/src/base.rs:122:9
[INFO] [stdout]     |
[INFO] [stdout] 122 |     let y = if x == '5' { 5 } else if x == '6' { 6 } else { -1 };
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `red`
[INFO] [stdout]    --> lang/src/base.rs:169:9
[INFO] [stdout]     |
[INFO] [stdout] 169 |     let red = Color::Red;
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_red`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `blue`
[INFO] [stdout]    --> lang/src/base.rs:170:9
[INFO] [stdout]     |
[INFO] [stdout] 170 |     let blue :Color = Color::Blue;
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_blue`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> lang/src/base.rs:186:9
[INFO] [stdout]     |
[INFO] [stdout] 186 |     let c = shape::Circle{
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c2`
[INFO] [stdout]    --> lang/src/base.rs:192:9
[INFO] [stdout]     |
[INFO] [stdout] 192 |     let c2 = Circle{
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_c2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> lang/src/base.rs:145:9
[INFO] [stdout]     |
[INFO] [stdout] 145 |     let y = x;   // the resource assigned to x is move to y
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `red`
[INFO] [stdout]    --> lang/src/base.rs:169:9
[INFO] [stdout]     |
[INFO] [stdout] 169 |     let red = Color::Red;
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_red`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `blue`
[INFO] [stdout]    --> lang/src/base.rs:170:9
[INFO] [stdout]     |
[INFO] [stdout] 170 |     let blue :Color = Color::Blue;
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_blue`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> lang/src/base.rs:186:9
[INFO] [stdout]     |
[INFO] [stdout] 186 |     let c = shape::Circle{
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c2`
[INFO] [stdout]    --> lang/src/base.rs:192:9
[INFO] [stdout]     |
[INFO] [stdout] 192 |     let c2 = Circle{
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_c2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Green` is never constructed
[INFO] [stdout]   --> lang/src/base.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | enum Color {
[INFO] [stdout]    |      ----- variant in this enum
[INFO] [stdout] 37 |     Red,
[INFO] [stdout] 38 |     Green,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Green` is never constructed
[INFO] [stdout]   --> lang/src/base.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | enum Color {
[INFO] [stdout]    |      ----- variant in this enum
[INFO] [stdout] 37 |     Red,
[INFO] [stdout] 38 |     Green,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> lang/src/thread.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct Circle {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 34 |     x: f64,
[INFO] [stdout]    |     ^
[INFO] [stdout] 35 |     y: f64,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Circle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `width` and `height` are never read
[INFO] [stdout]   --> lang/src/base.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct Rectangle {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 44 |     width: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 45 |     height: u32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `center` and `radius` are never read
[INFO] [stdout]  --> lang/src/shape/mod.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub struct Circle{
[INFO] [stdout]   |            ------ fields in this struct
[INFO] [stdout] 3 |     pub center: (i32, i32),
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout] 4 |     pub radius: u32,
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `area`, and `move_to` are never used
[INFO] [stdout]   --> lang/src/shape/mod.rs:8:8
[INFO] [stdout]    |
[INFO] [stdout] 7  | impl Circle {
[INFO] [stdout]    | ----------- associated items in this implementation
[INFO] [stdout] 8  |     fn new(center: (i32, i32), radius: u32) -> Circle {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     fn area(&self) -> f64 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     fn move_to(&mut self, new_center: (i32, i32)) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `width` and `height` are never read
[INFO] [stdout]   --> lang/src/base.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct Rectangle {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 44 |     width: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 45 |     height: u32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `center` and `radius` are never read
[INFO] [stdout]  --> lang/src/shape/mod.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub struct Circle{
[INFO] [stdout]   |            ------ fields in this struct
[INFO] [stdout] 3 |     pub center: (i32, i32),
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout] 4 |     pub radius: u32,
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `area`, and `move_to` are never used
[INFO] [stdout]   --> lang/src/shape/mod.rs:8:8
[INFO] [stdout]    |
[INFO] [stdout] 7  | impl Circle {
[INFO] [stdout]    | ----------- associated items in this implementation
[INFO] [stdout] 8  |     fn new(center: (i32, i32), radius: u32) -> Circle {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     fn area(&self) -> f64 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     fn move_to(&mut self, new_center: (i32, i32)) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]   --> lang/src/thread.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn foo<T: Debug>(s: T) {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo1` is never used
[INFO] [stdout]   --> lang/src/thread.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn foo1<T:Debug + Clone>(s: T) {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 26 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `clone` that must be used
[INFO] [stdout]   --> lang/src/thread.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 55 |     s.clone();
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: cloning is often expensive and is not expected to have side effects
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let _ = s.clone();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 26 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling tokio-macros v2.2.0
[INFO] [stderr]     Checking tokio v1.36.0
[INFO] [stderr]     Checking self-learning v0.1.0 (/opt/rustwide/workdir/pro/attri-hello-call)
[INFO] [stdout] println!("Hello, Greet");
[INFO] [stdout] attr: "bar"
[INFO] [stdout] item: "fn invoke1() {}"
[INFO] [stdout] fn: "fn prt1() { println!("Hello, greet2!"); }"
[INFO] [stdout] fn: "fn prt2() { println!("Hello, greet2!"); }"
[INFO] [stdout] println!("Hello, Greet");
[INFO] [stdout] attr: "bar"
[INFO] [stdout] item: "fn invoke1() {}"
[INFO] [stdout] fn: "fn prt1() { println!("Hello, greet2!"); }"
[INFO] [stdout] fn: "fn prt2() { println!("Hello, greet2!"); }"
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.93s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: num-bigint v0.1.44, num-complex v0.1.43, num-rational v0.1.42
[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" "ee2ee20c5d79dc81e86e77f598bca0135c6095c2e0d49c241bc22c5afb61d1e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ee2ee20c5d79dc81e86e77f598bca0135c6095c2e0d49c241bc22c5afb61d1e0", kill_on_drop: false }`
[INFO] [stdout] ee2ee20c5d79dc81e86e77f598bca0135c6095c2e0d49c241bc22c5afb61d1e0