[INFO] cloning repository https://github.com/weiyinfu/learnRust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/weiyinfu/learnRust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fweiyinfu%2FlearnRust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fweiyinfu%2FlearnRust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8b92f974f76c58bb7409cbe26d320d3d66d04aef
[INFO] checking weiyinfu/learnRust against master#3aedcf06b73fc36feeebca3d579e1d2a6c40acc5 for pr-65819
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fweiyinfu%2FlearnRust" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/weiyinfu/learnRust on toolchain 3aedcf06b73fc36feeebca3d579e1d2a6c40acc5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/weiyinfu/learnRust
[INFO] finished tweaking git repo https://github.com/weiyinfu/learnRust
[INFO] tweaked toml for git repo https://github.com/weiyinfu/learnRust written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/weiyinfu/learnRust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/jobserver:/tmp/crater-runner-fifo:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "rustops/crates-build-env@sha256:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7b4f37af173386988a8b7ad2934af772c18ed93a5a8b49aab1baf19f3e569969
[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" "7b4f37af173386988a8b7ad2934af772c18ed93a5a8b49aab1baf19f3e569969", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7b4f37af173386988a8b7ad2934af772c18ed93a5a8b49aab1baf19f3e569969", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7b4f37af173386988a8b7ad2934af772c18ed93a5a8b49aab1baf19f3e569969", kill_on_drop: false }`
[INFO] [stdout] 7b4f37af173386988a8b7ad2934af772c18ed93a5a8b49aab1baf19f3e569969
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/jobserver:/tmp/crater-runner-fifo:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "RUSTUP_TOOLCHAIN=3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "-e" "RUSTFLAGS=--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" "rustops/crates-build-env@sha256:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/tmp/crater-runner-fifo/jobserver-crater-fwd" "/opt/rustwide/cargo-home/bin/cargo" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f03c71a0285517aed8ec369135093d1483635738c79b1d98f6966bbeaf9cee97
[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" "f03c71a0285517aed8ec369135093d1483635738c79b1d98f6966bbeaf9cee97", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.69
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling proc-macro2 v1.0.12
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]     Checking futures-core v0.3.4
[INFO] [stderr]     Checking bytes v0.5.4
[INFO] [stderr]    Compiling cc v1.0.50
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling syn v1.0.18
[INFO] [stderr]     Checking itoa v0.4.5
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking pin-project-lite v0.1.4
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking futures-sink v0.3.4
[INFO] [stderr]     Checking futures-task v0.3.4
[INFO] [stderr]     Checking rustc-demangle v0.1.16
[INFO] [stderr]    Compiling serde v1.0.106
[INFO] [stderr]    Compiling httparse v1.3.4
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[INFO] [stderr]    Compiling ryu v1.0.4
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[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling indexmap v1.3.2
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]     Checking futures-channel v0.3.4
[INFO] [stderr]    Compiling backtrace-sys v0.1.35
[INFO] [stderr]     Checking http v0.2.1
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[INFO] [stderr]     Checking http-body v0.3.1
[INFO] [stderr]     Checking iovec v0.1.4
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[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]    Compiling quote v1.0.4
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking rand v0.3.23
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[INFO] [stderr]     Checking tokio v0.2.20
[INFO] [stderr]     Checking chrono v0.4.11
[INFO] [stderr]     Checking error-chain v0.10.0
[INFO] [stderr]     Checking serde_json v1.0.52
[INFO] [stderr]     Checking ferris-says v0.1.2
[INFO] [stderr]     Checking tokio-util v0.3.1
[INFO] [stderr]     Checking h2 v0.2.4
[INFO] [stderr]    Compiling pin-project-internal v0.4.9
[INFO] [stderr]    Compiling serde_derive v1.0.106
[INFO] [stderr]     Checking pin-project v0.4.9
[INFO] [stderr]     Checking hyper v0.13.5
[INFO] [stderr]     Checking learnRust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `b`
[INFO] [stdout]   --> src/cnTest.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn b() {}
[INFO] [stdout]    |    ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `haha`
[INFO] [stdout]  --> src/useFolder/one.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn haha() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `haha`
[INFO] [stdout]  --> src/useFolder/mod.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn haha() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/afStruct.rs:90:15
[INFO] [stdout]    |
[INFO] [stdout] 90 |     enum No {};
[INFO] [stdout]    |               ^ help: remove this semicolon
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]    --> src/axIfLet.rs:153:5
[INFO] [stdout]     |
[INFO] [stdout] 153 | /     if let Node { value } = x {
[INFO] [stdout] 154 | |         println!("{}", value);
[INFO] [stdout] 155 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout]     = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]     = help: consider replacing the `if let` with a `let`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]    --> src/axIfLet.rs:171:5
[INFO] [stdout]     |
[INFO] [stdout] 171 | /     if let Node(value) = x {
[INFO] [stdout] 172 | |         println!("{}", value);
[INFO] [stdout] 173 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]     = help: consider replacing the `if let` with a `let`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/axIfLet.rs:178:9
[INFO] [stdout]     |
[INFO] [stdout] 176 |         Node(value) => println!("value is {}", value),
[INFO] [stdout]     |         ----------- matches any value
[INFO] [stdout] 177 |         //下面这个分支永远不会执行到
[INFO] [stdout] 178 |         Node(3) => println!("value is 3"),
[INFO] [stdout]     |         ^^^^^^^ unreachable pattern
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `xNode`
[INFO] [stdout]   --> src/aeEnum.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |             xNode(i32),
[INFO] [stdout]    |             ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]   --> src/aeEnum.rs:60:20
[INFO] [stdout]    |
[INFO] [stdout] 60 |             User { name: String, age: i32 },
[INFO] [stdout]    |                    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `age`
[INFO] [stdout]   --> src/aeEnum.rs:60:34
[INFO] [stdout]    |
[INFO] [stdout] 60 |             User { name: String, age: i32 },
[INFO] [stdout]    |                                  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]   --> src/aeEnum.rs:86:13
[INFO] [stdout]    |
[INFO] [stdout] 86 |             Move { x: i32, y: i32 },
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]   --> src/aeEnum.rs:87:13
[INFO] [stdout]    |
[INFO] [stdout] 87 |             Write(String),
[INFO] [stdout]    |             ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ChangeColor`
[INFO] [stdout]   --> src/aeEnum.rs:88:13
[INFO] [stdout]    |
[INFO] [stdout] 88 |             ChangeColor(i32, i32, i32),
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]   --> src/afStruct.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |         name: String,
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `one`
[INFO] [stdout]   --> src/afStruct.rs:46:12
[INFO] [stdout]    |
[INFO] [stdout] 46 |         fn one() {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `two`
[INFO] [stdout]   --> src/afStruct.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 |         fn two(&self) {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `four`
[INFO] [stdout]   --> src/afStruct.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 55 |         fn four(&mut self) {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Node`
[INFO] [stdout]   --> src/afStruct.rs:89:12
[INFO] [stdout]    |
[INFO] [stdout] 89 |     struct Node;
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `No`
[INFO] [stdout]   --> src/afStruct.rs:90:10
[INFO] [stdout]    |
[INFO] [stdout] 90 |     enum No {};
[INFO] [stdout]    |          ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Red`
[INFO] [stdout]   --> src/apMatch.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |             Red,
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Blue`
[INFO] [stdout]   --> src/apMatch.rs:53:13
[INFO] [stdout]    |
[INFO] [stdout] 53 |             Blue,
[INFO] [stdout]    |             ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Green`
[INFO] [stdout]   --> src/apMatch.rs:54:13
[INFO] [stdout]    |
[INFO] [stdout] 54 |             Green,
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `HSV`
[INFO] [stdout]   --> src/apMatch.rs:57:13
[INFO] [stdout]    |
[INFO] [stdout] 57 |             HSV(u32, u32, u32),
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `HSL`
[INFO] [stdout]   --> src/apMatch.rs:58:13
[INFO] [stdout]    |
[INFO] [stdout] 58 |             HSL(u32, u32, u32),
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `CMY`
[INFO] [stdout]   --> src/apMatch.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |             CMY(u32, u32, u32),
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `CMYK`
[INFO] [stdout]   --> src/apMatch.rs:60:13
[INFO] [stdout]    |
[INFO] [stdout] 60 |             CMYK(u32, u32, u32, u32),
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]    --> src/apMatch.rs:119:13
[INFO] [stdout]     |
[INFO] [stdout] 119 |             y: i32,
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Missing`
[INFO] [stdout]    --> src/apMatch.rs:130:13
[INFO] [stdout]     |
[INFO] [stdout] 130 |             Missing,
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Err`
[INFO] [stdout]   --> src/aqUsefulStruct.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |         Err(E),
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest`
[INFO] [stdout]    --> src/bfLifetime.rs:111:8
[INFO] [stdout]     |
[INFO] [stdout] 111 |     fn longest(x: &str) -> &str {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `go`
[INFO] [stdout]    --> src/bfLifetime.rs:223:12
[INFO] [stdout]     |
[INFO] [stdout] 223 |         fn go<'a>(curcur: &'a mut &'a mut Box<i32>) {}
[INFO] [stdout]     |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `haha`
[INFO] [stdout]   --> src/caModule.rs:89:12
[INFO] [stdout]    |
[INFO] [stdout] 89 |         fn haha() {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `haha`
[INFO] [stdout]   --> src/caModule.rs:94:27
[INFO] [stdout]    |
[INFO] [stdout] 94 |             pub(crate) fn haha() {
[INFO] [stdout]    |                           ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `haha`
[INFO] [stdout]    --> src/caModule.rs:100:16
[INFO] [stdout]     |
[INFO] [stdout] 100 |             fn haha() {
[INFO] [stdout]     |                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Some`
[INFO] [stdout]   --> src/ceGeneric.rs:48:9
[INFO] [stdout]    |
[INFO] [stdout] 48 |         Some(T),
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `None`
[INFO] [stdout]   --> src/ceGeneric.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |         None,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Result`
[INFO] [stdout]   --> src/ceGeneric.rs:51:10
[INFO] [stdout]    |
[INFO] [stdout] 51 |     enum Result<T, E> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `distance`
[INFO] [stdout]    --> src/ceGeneric.rs:159:12
[INFO] [stdout]     |
[INFO] [stdout] 159 |         fn distance<N, E, G: Graph<N, E>>(graph: &G, start: &N, end: &N) -> u32 {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `distance`
[INFO] [stdout]    --> src/ceGeneric.rs:173:12
[INFO] [stdout]     |
[INFO] [stdout] 173 |         fn distance<G: Graph>(graph: &G, start: &G::N, end: &G::N) -> u32 {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_assign`
[INFO] [stdout]    --> src/clMacro.rs:160:13
[INFO] [stdout]     |
[INFO] [stdout] 160 |             fn $func<T: $bound<T, Output = T> + Copy>(xs: &mut Vec<T>, ys: &Vec<T>) {
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 172 |     op!(add_assign, Add, +=, add);
[INFO] [stdout]     |     ------------------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `mul_assign`
[INFO] [stdout]    --> src/clMacro.rs:160:13
[INFO] [stdout]     |
[INFO] [stdout] 160 |             fn $func<T: $bound<T, Output = T> + Copy>(xs: &mut Vec<T>, ys: &Vec<T>) {
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 173 |     op!(mul_assign, Mul, *=, mul);
[INFO] [stdout]     |     ------------------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sub_assign`
[INFO] [stdout]    --> src/clMacro.rs:160:13
[INFO] [stdout]     |
[INFO] [stdout] 160 |             fn $func<T: $bound<T, Output = T> + Copy>(xs: &mut Vec<T>, ys: &Vec<T>) {
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 174 |     op!(sub_assign, Sub, -=, sub);
[INFO] [stdout]     |     ------------------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `haha`
[INFO] [stdout]  --> src/useFolder/mod.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn haha() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/abPrint.rs:124:17
[INFO] [stdout]     |
[INFO] [stdout] 124 |                 write!(f, "[");
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/abPrint.rs:130:25
[INFO] [stdout]     |
[INFO] [stdout] 130 |                         write!(f, ",");
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/abPrint.rs:132:21
[INFO] [stdout]     |
[INFO] [stdout] 132 |                     write!(f, "{}", self.0[i]);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `x` should have an upper case name
[INFO] [stdout]   --> src/aeArray.rs:12:11
[INFO] [stdout]    |
[INFO] [stdout] 12 |     const x: i32 = 3;
[INFO] [stdout]    |           ^ help: convert the identifier to upper case (notice the capitalization): `X`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]   --> src/aoExpression.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |             2 * x;
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static variable `x` should have an upper case name
[INFO] [stdout]   --> src/bhSingleton.rs:75:20
[INFO] [stdout]    |
[INFO] [stdout] 75 |         static mut x: i32 = 0;
[INFO] [stdout]    |                    ^ help: convert the identifier to upper case (notice the capitalization): `X`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: path statement with no effect
[INFO] [stdout]    --> src/ckClosure.rs:195:13
[INFO] [stdout]     |
[INFO] [stdout] 195 |             s;
[INFO] [stdout]     |             ^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(path_statements)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/mcFile.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         file.read_to_string(&mut content);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `n` should have an upper case name
[INFO] [stdout]    --> src/mhVec.rs:138:11
[INFO] [stdout]     |
[INFO] [stdout] 138 |     const n: usize = 10;
[INFO] [stdout]     |           ^ help: convert the identifier to upper case: `N`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 49 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `learnRust`
[INFO] [stdout] error[E0594]: cannot assign to `a[_][_]`, as `Fn` closures cannot mutate their captured variables
[INFO] [stdout]   --> src/bin/13-闭包递归八皇后.rs:56:17
[INFO] [stdout]    |
[INFO] [stdout] 56 |                 a[x][y] = 1;
[INFO] [stdout]    |                 ^^^^^^^^^^^ cannot assign
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] error[E0594]: cannot assign to `a[_][_]`, as `Fn` closures cannot mutate their captured variables
[INFO] [stdout]   --> src/bin/13-闭包递归八皇后.rs:58:17
[INFO] [stdout]    |
[INFO] [stdout] 58 |                 a[x][y] = 0;
[INFO] [stdout]    |                 ^^^^^^^^^^^ cannot assign
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stdout] error[E0502]: cannot borrow `a` as mutable because it is also borrowed as immutable
[INFO] [stdout]   --> src/bin/13-闭包递归八皇后.rs:46:14
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let canput = |x: &usize, y: &usize| {
[INFO] [stdout]    |                  ---------------------- immutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 21 |                         if a[xx as usize][yy as usize] != 0 {
[INFO] [stdout]    |                            - first borrow occurs due to use of `a` in closure
[INFO] [stdout] ...
[INFO] [stdout] 46 |         go: &|g, x, y| {
[INFO] [stdout]    |              ^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 55 |             if canput(&x, &y) {
[INFO] [stdout]    |                ------ immutable borrow later captured here by closure
[INFO] [stdout] 56 |                 a[x][y] = 1;
[INFO] [stdout]    |                 - second borrow occurs due to use of `a` in closure
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0502, E0594.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0502`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f03c71a0285517aed8ec369135093d1483635738c79b1d98f6966bbeaf9cee97", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f03c71a0285517aed8ec369135093d1483635738c79b1d98f6966bbeaf9cee97", kill_on_drop: false }`
[INFO] [stdout] f03c71a0285517aed8ec369135093d1483635738c79b1d98f6966bbeaf9cee97