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[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ityy/rust_study" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fityy%2Frust_study", kill_on_drop: false }`
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[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e8756fd6eb7d1122c156c85e59aef75e8d4cbf3f
[INFO] checking ityy/rust_study against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fityy%2Frust_study" "/workspace/builds/worker-7/source", kill_on_drop: false }`
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[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ityy/rust_study on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ityy/rust_study
[INFO] finished tweaking git repo https://github.com/ityy/rust_study
[INFO] tweaked toml for git repo https://github.com/ityy/rust_study written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/ityy/rust_study already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v0.1.7
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[INFO] [stderr]     Checking rust_study v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking lock_api v0.3.3
[INFO] [stderr]     Checking try_from v0.3.2
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[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/dylib_study/t01_libloading_test/dylib_1/src/lib.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/dylib_study/t01_libloading_test/dylib_1/src/lib.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `str`, which is not FFI-safe
[INFO] [stdout]   --> src/dylib_study/t01_libloading_test/dylib_1/src/lib.rs:15:48
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub extern fn have_args_no_return(p1: u32, p2: &str) {
[INFO] [stdout]    |                                                ^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout]    = help: consider using `*const u8` and a length instead
[INFO] [stdout]    = note: string slices have no C equivalent
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `for<'r> fn(&'r str)`, which is not FFI-safe
[INFO] [stdout]   --> src/dylib_study/t01_libloading_test/dylib_1/src/lib.rs:21:35
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub extern fn callback_test(func: fn(&str)) -> u32 {
[INFO] [stdout]    |                                   ^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using an `extern fn(...) -> ...` function pointer instead
[INFO] [stdout]    = note: this function pointer has Rust-specific calling convention
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `str`, which is not FFI-safe
[INFO] [stdout]   --> src/dylib_study/t01_libloading_test/dylib_1/src/lib.rs:15:48
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub extern fn have_args_no_return(p1: u32, p2: &str) {
[INFO] [stdout]    |                                                ^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout]    = help: consider using `*const u8` and a length instead
[INFO] [stdout]    = note: string slices have no C equivalent
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `for<'r> fn(&'r str)`, which is not FFI-safe
[INFO] [stdout]   --> src/dylib_study/t01_libloading_test/dylib_1/src/lib.rs:21:35
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub extern fn callback_test(func: fn(&str)) -> u32 {
[INFO] [stdout]    |                                   ^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using an `extern fn(...) -> ...` function pointer instead
[INFO] [stdout]    = note: this function pointer has Rust-specific calling convention
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking foreign-types v0.3.2
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
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[INFO] [stderr]    Compiling memoffset v0.5.1
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[INFO] [stderr]    Compiling hyper v0.12.33
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[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_xorshift v0.1.1
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[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling crossbeam-utils v0.7.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.0
[INFO] [stderr]    Compiling indexmap v1.3.0
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]     Checking mio v0.6.21
[INFO] [stderr]     Checking want v0.2.0
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]     Checking kv-log-macro v1.0.4
[INFO] [stderr]     Checking parking_lot v0.10.0
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking url v1.7.2
[INFO] [stderr]     Checking t01_plugin_manage v0.1.0 (/opt/rustwide/workdir/src/dylib_study/t02_plugin_manage)
[INFO] [stderr]     Checking simple_main_project v0.1.0 (/opt/rustwide/workdir/src/dylib_study/t01_libloading_test/simple_main_project)
[INFO] [stderr]     Checking tokio-timer v0.2.11
[INFO] [stderr]     Checking tokio-current-thread v0.1.6
[INFO] [stderr]     Checking url v2.1.0
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/dylib_study/t01_libloading_test/simple_main_project/src/main.rs:68:5
[INFO] [stdout]    |
[INFO] [stdout] 68 |     call_no_args_no_return();
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/dylib_study/t01_libloading_test/simple_main_project/src/main.rs:69:5
[INFO] [stdout]    |
[INFO] [stdout] 69 |     call_have_args_no_return();
[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: function is never used: `call_no_args_no_return`
[INFO] [stdout]  --> src/dylib_study/t01_libloading_test/simple_main_project/src/main.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn call_no_args_no_return() -> Result<u32, Box<dyn Error>> {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `call_have_args_no_return`
[INFO] [stdout]   --> src/dylib_study/t01_libloading_test/simple_main_project/src/main.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn call_have_args_no_return() -> Result<u32, Box<dyn Error>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `call_callback_test`
[INFO] [stdout]   --> src/dylib_study/t01_libloading_test/simple_main_project/src/main.rs:36:4
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn call_callback_test() -> Result<u32, Box<dyn Error>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `callback_test`
[INFO] [stdout]   --> src/dylib_study/t01_libloading_test/simple_main_project/src/main.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn callback_test(message: &str) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `call_reqwest_test`
[INFO] [stdout]   --> src/dylib_study/t01_libloading_test/simple_main_project/src/main.rs:52:4
[INFO] [stdout]    |
[INFO] [stdout] 52 | fn call_reqwest_test() -> Result<u32, Box<dyn Error>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling unicase v2.4.0
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling unicase v1.4.2
[INFO] [stderr]    Compiling error-chain v0.12.1
[INFO] [stderr]     Checking unic-segment v0.7.0
[INFO] [stderr]     Checking mime v0.2.6
[INFO] [stderr]     Checking flate2 v1.0.13
[INFO] [stderr]     Checking rand v0.7.2
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking tokio-io v0.1.12
[INFO] [stderr]     Checking http v0.1.18
[INFO] [stderr]     Checking string v0.2.1
[INFO] [stderr]     Checking tokio-buf v0.1.1
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[INFO] [stderr]    Compiling phf_shared v0.7.24
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[INFO] [stderr]     Checking mime v0.3.13
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking phf v0.7.24
[INFO] [stderr]    Compiling mime_guess v2.0.1
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]     Checking tokio v0.2.6
[INFO] [stderr]    Compiling pest_meta v2.1.2
[INFO] [stderr]     Checking tokio-codec v0.1.1
[INFO] [stderr]     Checking crossbeam-deque v0.7.2
[INFO] [stderr]     Checking t01_env_logger v0.1.0 (/opt/rustwide/workdir/src/logging_framework_test/t01_env_logger)
[INFO] [stderr]    Compiling backtrace-sys v0.1.31
[INFO] [stderr]    Compiling openssl-sys v0.9.53
[INFO] [stderr]    Compiling brotli-sys v0.3.2
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]   --> src/logging_framework_test/t01_env_logger/src/main.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #[macro_use]
[INFO] [stdout]    | ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `fmt`
[INFO] [stdout]   --> src/logging_framework_test/t01_env_logger/src/main.rs:18:32
[INFO] [stdout]    |
[INFO] [stdout] 18 | use env_logger::{Builder, Env, fmt};
[INFO] [stdout]    |                                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `init_logger`
[INFO] [stdout]   --> src/logging_framework_test/t01_env_logger/src/main.rs:44:4
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn init_logger() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking async-std v1.4.0
[INFO] [stderr]     Checking tokio-threadpool v0.1.15
[INFO] [stderr]     Checking uuid v0.7.4
[INFO] [stderr]     Checking fake v1.3.0
[INFO] [stderr]     Checking chrono v0.4.10
[INFO] [stderr]     Checking parking_lot v0.7.1
[INFO] [stderr]    Compiling native-tls v0.2.3
[INFO] [stderr]     Checking tokio-reactor v0.1.9
[INFO] [stderr]     Checking tokio-uds v0.2.5
[INFO] [stderr]     Checking tokio-tcp v0.1.3
[INFO] [stderr]     Checking tokio-udp v0.1.3
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]     Checking backtrace v0.3.34
[INFO] [stderr]    Compiling mime_guess v1.8.7
[INFO] [stderr]     Checking tokio-fs v0.1.6
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stderr]     Checking publicsuffix v1.5.2
[INFO] [stderr]     Checking tokio-util v0.2.0
[INFO] [stderr]     Checking tokio-core v0.1.17
[INFO] [stderr]     Checking actix-codec v0.2.0
[INFO] [stderr]     Checking h2 v0.1.26
[INFO] [stderr]     Checking http-body v0.1.0
[INFO] [stderr]     Checking futures_study_v016 v0.1.0 (/opt/rustwide/workdir/src/b02_async_study/futures_study_v016)
[INFO] [stdout] warning: unused import: `ok`
[INFO] [stdout]  --> src/b02_async_study/futures_study_v016/src/future_012_chain_error.rs:5:28
[INFO] [stdout]   |
[INFO] [stdout] 5 | use futures::future::{err, ok};
[INFO] [stdout]   |                            ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ok`
[INFO] [stdout]  --> src/b02_async_study/futures_study_v016/src/future_012_chain_error.rs:5:28
[INFO] [stdout]   |
[INFO] [stdout] 5 | use futures::future::{err, ok};
[INFO] [stdout]   |                            ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ErrorA`, `ErrorB`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_011_chain.rs:10:37
[INFO] [stdout]    |
[INFO] [stdout] 10 | use crate::future_012_chain_error::{ErrorA, ErrorB};
[INFO] [stdout]    |                                     ^^^^^^  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_051_stream.rs:39:5
[INFO] [stdout]    |
[INFO] [stdout] 39 | use std::thread;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `DateTime`, `Utc`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_051_stream.rs:41:14
[INFO] [stdout]    |
[INFO] [stdout] 41 | use chrono::{DateTime, Utc};
[INFO] [stdout]    |              ^^^^^^^^  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Future`, `task`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_051_stream.rs:42:22
[INFO] [stdout]    |
[INFO] [stdout] 42 | use futures::{Async, Future, Poll, Stream, task};
[INFO] [stdout]    |                      ^^^^^^                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `time::Duration`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_051_stream.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 | use time::Duration;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio_core::reactor::Core`
[INFO] [stdout]  --> src/b02_async_study/futures_study_v016/src/future_011_chain.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use tokio_core::reactor::Core;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ErrorA`, `ErrorB`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_011_chain.rs:10:37
[INFO] [stdout]    |
[INFO] [stdout] 10 | use crate::future_012_chain_error::{ErrorA, ErrorB};
[INFO] [stdout]    |                                     ^^^^^^  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio_core::reactor::Core`
[INFO] [stdout]  --> src/b02_async_study/futures_study_v016/src/future_031_poll.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use tokio_core::reactor::Core;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio_core::reactor::Core`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_041_wait.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | use tokio_core::reactor::Core;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_051_stream.rs:39:5
[INFO] [stdout]    |
[INFO] [stdout] 39 | use std::thread;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `DateTime`, `Utc`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_051_stream.rs:41:14
[INFO] [stdout]    |
[INFO] [stdout] 41 | use chrono::{DateTime, Utc};
[INFO] [stdout]    |              ^^^^^^^^  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Future`, `task`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_051_stream.rs:42:22
[INFO] [stdout]    |
[INFO] [stdout] 42 | use futures::{Async, Future, Poll, Stream, task};
[INFO] [stdout]    |                      ^^^^^^                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `futures::future::ok`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_051_stream.rs:43:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | use futures::future::ok;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `time::Duration`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_051_stream.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 | use time::Duration;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio_core::reactor::Core`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_051_stream.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 45 | use tokio_core::reactor::Core;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ret`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_051_stream.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |     let ret = reactor.run(future);
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_ret`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `my_fn`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_011_chain.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn my_fn() -> Result<u32, Box<Error>> {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `my_fut`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_011_chain.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn my_fut() -> impl Future<Item=u32, Error=Box<Error>> {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `my_fn_squared`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_011_chain.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn my_fn_squared(i: u32) -> Result<u32, Box<Error>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `my_fut_squared`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_011_chain.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn my_fut_squared(i: u32) -> impl Future<Item=u32, Error=Box<Error>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_031_poll.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn new(message: String, delay: Duration) -> WaitForIt {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/b02_async_study/futures_study_v016/src/future_051_stream.rs:57:12
[INFO] [stdout]    |
[INFO] [stdout] 57 |     pub fn new(max: u32) -> MyStream {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 17 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking b03_book_async_rs v0.1.0 (/opt/rustwide/workdir/src/b02_async_study/b03_book_async_rs)
[INFO] [stdout] warning: unused import: `thread`
[INFO] [stdout]  --> src/b02_async_study/b03_book_async_rs/src/t2_1_futures_tasks.rs:7:24
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::{io as stdio, thread};
[INFO] [stdout]   |                        ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::prelude::*`
[INFO] [stdout]  --> src/b02_async_study/b03_book_async_rs/src/t2_1_futures_tasks.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::io::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::time::Duration`
[INFO] [stdout]   --> src/b02_async_study/b03_book_async_rs/src/t2_1_futures_tasks.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use std::time::Duration;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `task`
[INFO] [stdout]   --> src/b02_async_study/b03_book_async_rs/src/t2_1_futures_tasks.rs:14:43
[INFO] [stdout]    |
[INFO] [stdout] 14 | use async_std::{fs::File, io, prelude::*, task};
[INFO] [stdout]    |                                           ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::prelude::*`
[INFO] [stdout]  --> src/b02_async_study/b03_book_async_rs/src/t2_1_futures_tasks.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::io::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_file`
[INFO] [stdout]   --> src/b02_async_study/b03_book_async_rs/src/t2_1_futures_tasks.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn read_file(path: &str) -> stdio::Result<String> {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_file_async`
[INFO] [stdout]   --> src/b02_async_study/b03_book_async_rs/src/t2_1_futures_tasks.rs:54:10
[INFO] [stdout]    |
[INFO] [stdout] 54 | async fn read_file_async(path: &str) -> io::Result<String> {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `nothing2`
[INFO] [stdout]    --> src/b02_async_study/b03_book_async_rs/src/t2_1_futures_tasks.rs:111:4
[INFO] [stdout]     |
[INFO] [stdout] 111 | fn nothing2() {}
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `nothing3`
[INFO] [stdout]    --> src/b02_async_study/b03_book_async_rs/src/t2_1_futures_tasks.rs:128:4
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn nothing3() {}
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `nothing4`
[INFO] [stdout]    --> src/b02_async_study/b03_book_async_rs/src/t2_1_futures_tasks.rs:160:4
[INFO] [stdout]     |
[INFO] [stdout] 160 | fn nothing4() {}
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `nothing5`
[INFO] [stdout]    --> src/b02_async_study/b03_book_async_rs/src/t2_1_futures_tasks.rs:165:4
[INFO] [stdout]     |
[INFO] [stdout] 165 | fn nothing5() {}
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `nothing1`
[INFO] [stdout]   --> src/b02_async_study/b03_book_async_rs/src/t3_1_chatroom.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn nothing1() {}
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `nothing2`
[INFO] [stdout]   --> src/b02_async_study/b03_book_async_rs/src/t3_1_chatroom.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn nothing2() {}
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `nothing2`
[INFO] [stdout]    --> src/b02_async_study/b03_book_async_rs/src/t2_1_futures_tasks.rs:111:4
[INFO] [stdout]     |
[INFO] [stdout] 111 | fn nothing2() {}
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `nothing3`
[INFO] [stdout]    --> src/b02_async_study/b03_book_async_rs/src/t2_1_futures_tasks.rs:128:4
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn nothing3() {}
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `nothing4`
[INFO] [stdout]    --> src/b02_async_study/b03_book_async_rs/src/t2_1_futures_tasks.rs:160:4
[INFO] [stdout]     |
[INFO] [stdout] 160 | fn nothing4() {}
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `nothing5`
[INFO] [stdout]    --> src/b02_async_study/b03_book_async_rs/src/t2_1_futures_tasks.rs:165:4
[INFO] [stdout]     |
[INFO] [stdout] 165 | fn nothing5() {}
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `nothing1`
[INFO] [stdout]   --> src/b02_async_study/b03_book_async_rs/src/t3_1_chatroom.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn nothing1() {}
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `nothing2`
[INFO] [stdout]   --> src/b02_async_study/b03_book_async_rs/src/t3_1_chatroom.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn nothing2() {}
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking iron v0.6.1
[INFO] [stderr]     Checking objectid v0.2.0
[INFO] [stderr]     Checking router v0.6.0
[INFO] [stderr]     Checking http_req v0.5.3
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling pest_generator v2.1.1
[INFO] [stderr]     Checking brotli2 v0.3.2
[INFO] [stderr]     Checking hyper-tls v0.3.2
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling derive_more v0.99.2
[INFO] [stderr]    Compiling pin-project-internal v0.4.6
[INFO] [stderr]    Compiling structopt-derive v0.4.9
[INFO] [stderr]    Compiling actix-macros v0.1.1
[INFO] [stderr]    Compiling async-trait v0.1.22
[INFO] [stderr]    Compiling enum-as-inner v0.3.0
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]    Compiling actix-web-codegen v0.2.0
[INFO] [stderr]    Compiling futures-macro v0.3.1
[INFO] [stderr]     Checking failure v0.1.6
[INFO] [stderr]     Checking futures-util v0.3.1
[INFO] [stderr]     Checking structopt v0.3.16
[INFO] [stderr]     Checking t10_3_0_csv_challenge v0.1.0 (/opt/rustwide/workdir/src/book_study_notes/book01_the_tao_of_programming/src/c10_modularization_programming/t10_3_0_csv_challenge)
[INFO] [stderr]     Checking yangtool v0.1.0 (/opt/rustwide/workdir/src/command_project/yangtool)
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/command_project/yangtool/src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Command`
[INFO] [stdout]  --> src/command_project/yangtool/src/main.rs:6:20
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::process::{Command, Output};
[INFO] [stdout]   |                    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: derive helper attribute is used before it is introduced
[INFO] [stdout]   --> src/book_study_notes/book01_the_tao_of_programming/src/c10_modularization_programming/t10_3_0_csv_challenge/src/opt.rs:13:3
[INFO] [stdout]    |
[INFO] [stdout] 13 | #[structopt(name = "csv_challenge", about = "An example of StructOpt usage.")]
[INFO] [stdout]    |   ^^^^^^^^^
[INFO] [stdout] 14 | #[derive(Debug, StructOpt)]
[INFO] [stdout]    |                 --------- the attribute is introduced here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(legacy_derive_helpers)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #79202 <https://github.com/rust-lang/rust/issues/79202>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::path::PathBuf`
[INFO] [stdout]   --> src/book_study_notes/book01_the_tao_of_programming/src/c10_modularization_programming/t10_3_0_csv_challenge/src/csv_operation/write.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 62 |     use std::path::PathBuf;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `replace_column`, `write_csv`
[INFO] [stdout]   --> src/book_study_notes/book01_the_tao_of_programming/src/c10_modularization_programming/t10_3_0_csv_challenge/src/csv_operation/write.rs:64:17
[INFO] [stdout]    |
[INFO] [stdout] 64 |     use super::{replace_column, write_csv};
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::read::load_csv`
[INFO] [stdout]   --> src/book_study_notes/book01_the_tao_of_programming/src/c10_modularization_programming/t10_3_0_csv_challenge/src/csv_operation/write.rs:65:9
[INFO] [stdout]    |
[INFO] [stdout] 65 |     use super::read::load_csv;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/command_project/yangtool/src/main.rs:55:13
[INFO] [stdout]    |
[INFO] [stdout] 55 |         Err(e) => error!("{}", message),
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `start`
[INFO] [stdout]  --> src/command_project/yangtool/src/api.rs:7:42
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn or_exec(reload: bool, quit: bool, start: bool) -> io::Result<Output> {
[INFO] [stdout]   |                                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_start`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/command_project/yangtool/src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Command`
[INFO] [stdout]  --> src/command_project/yangtool/src/main.rs:6:20
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::process::{Command, Output};
[INFO] [stdout]   |                    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: derive helper attribute is used before it is introduced
[INFO] [stdout]   --> src/book_study_notes/book01_the_tao_of_programming/src/c10_modularization_programming/t10_3_0_csv_challenge/src/opt.rs:13:3
[INFO] [stdout]    |
[INFO] [stdout] 13 | #[structopt(name = "csv_challenge", about = "An example of StructOpt usage.")]
[INFO] [stdout]    |   ^^^^^^^^^
[INFO] [stdout] 14 | #[derive(Debug, StructOpt)]
[INFO] [stdout]    |                 --------- the attribute is introduced here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(legacy_derive_helpers)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #79202 <https://github.com/rust-lang/rust/issues/79202>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/command_project/yangtool/src/main.rs:55:13
[INFO] [stdout]    |
[INFO] [stdout] 55 |         Err(e) => error!("{}", message),
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `start`
[INFO] [stdout]  --> src/command_project/yangtool/src/api.rs:7:42
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn or_exec(reload: bool, quit: bool, start: bool) -> io::Result<Output> {
[INFO] [stdout]   |                                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_start`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: an inner attribute is not permitted following an outer doc comment
[INFO] [stdout]  --> src/book_study_notes/book01_the_tao_of_programming/src/c10_modularization_programming/t10_3_0_csv_challenge/benches/file_op_bench.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | /// 基准测试需要使用#![feature(test)]，而feature功能必须在夜版Rust环境下。
[INFO] [stdout]   | -------------------------------------------------------------------------- previous doc comment
[INFO] [stdout] 8 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^ not permitted following an outer attribute
[INFO] [stdout]   |
[INFO] [stdout]   = note: inner attributes, like `#![no_std]`, annotate the item enclosing them, and are usually found at the beginning of source files. Outer attributes, like `#[test]`, annotate the item following them.
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: use of unstable library feature 'test': `bench` is a part of custom test frameworks which are unstable
[INFO] [stdout]   --> src/book_study_notes/book01_the_tao_of_programming/src/c10_modularization_programming/t10_3_0_csv_challenge/benches/file_op_bench.rs:20:3
[INFO] [stdout]    |
[INFO] [stdout] 20 | #[bench]
[INFO] [stdout]    |   ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(soft_unstable)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #64266 <https://github.com/rust-lang/rust/issues/64266>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: use of unstable library feature 'test': `bench` is a part of custom test frameworks which are unstable
[INFO] [stdout]   --> src/book_study_notes/book01_the_tao_of_programming/src/c10_modularization_programming/t10_3_0_csv_challenge/benches/file_op_bench.rs:36:3
[INFO] [stdout]    |
[INFO] [stdout] 36 | #[bench]
[INFO] [stdout]    |   ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #64266 <https://github.com/rust-lang/rust/issues/64266>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Opt`
[INFO] [stdout]   --> src/book_study_notes/book01_the_tao_of_programming/src/c10_modularization_programming/t10_3_0_csv_challenge/benches/file_op_bench.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     Opt,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'test'
[INFO] [stdout]  --> src/book_study_notes/book01_the_tao_of_programming/src/c10_modularization_programming/t10_3_0_csv_challenge/benches/file_op_bench.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | extern crate test;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #50297 <https://github.com/rust-lang/rust/issues/50297> for more information
[INFO] [stdout]   = help: add `#![feature(test)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'test'
[INFO] [stdout]   --> src/book_study_notes/book01_the_tao_of_programming/src/c10_modularization_programming/t10_3_0_csv_challenge/benches/file_op_bench.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use test::Bencher;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #50297 <https://github.com/rust-lang/rust/issues/50297> for more information
[INFO] [stdout]    = help: add `#![feature(test)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'test'
[INFO] [stdout]   --> src/book_study_notes/book01_the_tao_of_programming/src/c10_modularization_programming/t10_3_0_csv_challenge/benches/file_op_bench.rs:21:32
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn bench_read_100times(b: &mut Bencher) {
[INFO] [stdout]    |                                ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #50297 <https://github.com/rust-lang/rust/issues/50297> for more information
[INFO] [stdout]    = help: add `#![feature(test)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'test'
[INFO] [stdout]   --> src/book_study_notes/book01_the_tao_of_programming/src/c10_modularization_programming/t10_3_0_csv_challenge/benches/file_op_bench.rs:23:17
[INFO] [stdout]    |
[INFO] [stdout] 23 |         let n = test::black_box(100);
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #50297 <https://github.com/rust-lang/rust/issues/50297> for more information
[INFO] [stdout]    = help: add `#![feature(test)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'test'
[INFO] [stdout]   --> src/book_study_notes/book01_the_tao_of_programming/src/c10_modularization_programming/t10_3_0_csv_challenge/benches/file_op_bench.rs:37:30
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn bench_rw_100times(b: &mut Bencher) {
[INFO] [stdout]    |                              ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #50297 <https://github.com/rust-lang/rust/issues/50297> for more information
[INFO] [stdout]    = help: add `#![feature(test)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'test'
[INFO] [stdout]   --> src/book_study_notes/book01_the_tao_of_programming/src/c10_modularization_programming/t10_3_0_csv_challenge/benches/file_op_bench.rs:39:17
[INFO] [stdout]    |
[INFO] [stdout] 39 |         let n = test::black_box(100);
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #50297 <https://github.com/rust-lang/rust/issues/50297> for more information
[INFO] [stdout]    = help: add `#![feature(test)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'test'
[INFO] [stdout]   --> src/book_study_notes/book01_the_tao_of_programming/src/c10_modularization_programming/t10_3_0_csv_challenge/benches/file_op_bench.rs:22:7
[INFO] [stdout]    |
[INFO] [stdout] 22 |     b.iter(|| {
[INFO] [stdout]    |       ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #50297 <https://github.com/rust-lang/rust/issues/50297> for more information
[INFO] [stdout]    = help: add `#![feature(test)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'test'
[INFO] [stdout]   --> src/book_study_notes/book01_the_tao_of_programming/src/c10_modularization_programming/t10_3_0_csv_challenge/benches/file_op_bench.rs:38:7
[INFO] [stdout]    |
[INFO] [stdout] 38 |     b.iter(|| {
[INFO] [stdout]    |       ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #50297 <https://github.com/rust-lang/rust/issues/50297> for more information
[INFO] [stdout]    = help: add `#![feature(test)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 11 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0658`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `t10_3_0_csv_challenge` due to 12 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused import: `Opt`
[INFO] [stdout]   --> src/book_study_notes/book01_the_tao_of_programming/src/c10_modularization_programming/t10_3_0_csv_challenge/tests/integration_test.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |         Opt,
[INFO] [stdout]    |         ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "8ffa5e098c967723e6dee413c647d58d759fc409c926d270aada10a7c976e664", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8ffa5e098c967723e6dee413c647d58d759fc409c926d270aada10a7c976e664", kill_on_drop: false }`
[INFO] [stdout] 8ffa5e098c967723e6dee413c647d58d759fc409c926d270aada10a7c976e664