[INFO] fetching crate fast_log 1.2.3...
[INFO] testing fast_log-1.2.3 against beta-2020-10-09 for beta-1.48-1
[INFO] extracting crate fast_log 1.2.3 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate fast_log 1.2.3 on toolchain beta-2020-10-09
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate fast_log 1.2.3
[INFO] finished tweaking crates.io crate fast_log 1.2.3
[INFO] tweaked toml for crates.io crate fast_log 1.2.3 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f2c8974d3a38909f2745fcb423732bcc2e1df9b3fdd291221651a7952284a69e
[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" "f2c8974d3a38909f2745fcb423732bcc2e1df9b3fdd291221651a7952284a69e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f2c8974d3a38909f2745fcb423732bcc2e1df9b3fdd291221651a7952284a69e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f2c8974d3a38909f2745fcb423732bcc2e1df9b3fdd291221651a7952284a69e", kill_on_drop: false }`
[INFO] [stdout] f2c8974d3a38909f2745fcb423732bcc2e1df9b3fdd291221651a7952284a69e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] a408f02989c04d24cf0e1bbf6e3c53aa0081b1dbe2490b01dd447b1ad029b8cc
[INFO] running `Command { std: "docker" "start" "-a" "a408f02989c04d24cf0e1bbf6e3c53aa0081b1dbe2490b01dd447b1ad029b8cc", kill_on_drop: false }`
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling cache-padded v1.1.1
[INFO] [stderr]    Compiling waker-fn v1.1.0
[INFO] [stderr]    Compiling fastrand v1.4.0
[INFO] [stderr]    Compiling futures-io v0.3.6
[INFO] [stderr]    Compiling parking v2.0.0
[INFO] [stderr]    Compiling once_cell v1.4.1
[INFO] [stderr]    Compiling async-task v4.0.2
[INFO] [stderr]    Compiling event-listener v2.5.1
[INFO] [stderr]    Compiling vec-arena v1.0.0
[INFO] [stderr]    Compiling atomic-waker v1.0.0
[INFO] [stderr]    Compiling nb-connect v1.0.2
[INFO] [stderr]    Compiling signal-hook-registry v1.2.1
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]    Compiling concurrent-queue v1.2.2
[INFO] [stderr]    Compiling async-mutex v1.4.0
[INFO] [stderr]    Compiling futures-lite v1.11.1
[INFO] [stderr]    Compiling async-channel v1.5.1
[INFO] [stderr]    Compiling polling v2.0.1
[INFO] [stderr]    Compiling mio v0.6.22
[INFO] [stderr]    Compiling kv-log-macro v1.0.7
[INFO] [stderr]    Compiling async-io v1.1.10
[INFO] [stderr]    Compiling async-executor v1.3.0
[INFO] [stderr]    Compiling blocking v1.0.2
[INFO] [stderr]    Compiling async-global-executor v1.3.0
[INFO] [stderr]    Compiling mio-uds v0.6.8
[INFO] [stderr]    Compiling async-std v1.6.5
[INFO] [stderr]    Compiling tokio v0.2.22
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling serde_json v1.0.59
[INFO] [stderr]    Compiling fast_log v1.2.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Cell`, `RefCell`
[INFO] [stdout]  --> src/log.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cell::{Cell, RefCell};
[INFO] [stdout]   |                 ^^^^  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Arc`, `Mutex`
[INFO] [stdout]  --> src/log.rs:5:17
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::sync::{Arc, Mutex, RwLock};
[INFO] [stdout]   |                 ^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::sleep`
[INFO] [stdout]  --> src/log.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::thread::sleep;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Duration`, `SystemTime`
[INFO] [stdout]  --> src/log.rs:8:17
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::time::{Duration, SystemTime};
[INFO] [stdout]   |                 ^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `error`, `info`, `warn`
[INFO] [stdout]   --> src/log.rs:11:11
[INFO] [stdout]    |
[INFO] [stdout] 11 | use log::{error, info, warn};
[INFO] [stdout]    |           ^^^^^  ^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::time_util`
[INFO] [stdout]   --> src/log.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | use crate::time_util;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `error`
[INFO] [stdout]  --> src/error.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{error, fmt};
[INFO] [stdout]   |           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::prelude`
[INFO] [stdout]   --> src/log.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use tokio::prelude::*;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/time_util.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let mut time = SystemTime::now().duration_since(start).unwrap();
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/time_util.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let mut time = SystemTime::now().duration_since(start).unwrap();
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `e`
[INFO] [stdout]   --> src/error.rs:69:4
[INFO] [stdout]    |
[INFO] [stdout] 69 | fn e() -> Result<String, LogError> {
[INFO] [stdout]    |    ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/log.rs:61:17
[INFO] [stdout]    |
[INFO] [stdout] 61 |                 self.std_sender.as_ref().unwrap().send(arg);
[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 `std::result::Result` that must be used
[INFO] [stdout]    --> src/log.rs:145:17
[INFO] [stdout]     |
[INFO] [stdout] 145 |                 file.write(s.as_bytes());
[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: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 18.83s
[INFO] running `Command { std: "docker" "inspect" "a408f02989c04d24cf0e1bbf6e3c53aa0081b1dbe2490b01dd447b1ad029b8cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a408f02989c04d24cf0e1bbf6e3c53aa0081b1dbe2490b01dd447b1ad029b8cc", kill_on_drop: false }`
[INFO] [stdout] a408f02989c04d24cf0e1bbf6e3c53aa0081b1dbe2490b01dd447b1ad029b8cc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4f79140c7de181c2f8c80dd9578ba8ed9cb952b2dc2c21a3b6ada0e9087ad9d8
[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" "4f79140c7de181c2f8c80dd9578ba8ed9cb952b2dc2c21a3b6ada0e9087ad9d8", kill_on_drop: false }`
[INFO] [stderr]    Compiling fast_log v1.2.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Cell`, `RefCell`
[INFO] [stdout]  --> src/log.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cell::{Cell, RefCell};
[INFO] [stdout]   |                 ^^^^  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Arc`, `Mutex`
[INFO] [stdout]  --> src/log.rs:5:17
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::sync::{Arc, Mutex, RwLock};
[INFO] [stdout]   |                 ^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::sleep`
[INFO] [stdout]  --> src/log.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::thread::sleep;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Duration`, `SystemTime`
[INFO] [stdout]  --> src/log.rs:8:17
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::time::{Duration, SystemTime};
[INFO] [stdout]   |                 ^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `error`, `info`, `warn`
[INFO] [stdout]   --> src/log.rs:11:11
[INFO] [stdout]    |
[INFO] [stdout] 11 | use log::{error, info, warn};
[INFO] [stdout]    |           ^^^^^  ^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::time_util`
[INFO] [stdout]   --> src/log.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | use crate::time_util;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `error`
[INFO] [stdout]  --> src/error.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{error, fmt};
[INFO] [stdout]   |           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::prelude`
[INFO] [stdout]   --> src/log.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use tokio::prelude::*;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/time_util.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let mut time = SystemTime::now().duration_since(start).unwrap();
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/time_util.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let mut time = SystemTime::now().duration_since(start).unwrap();
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `e`
[INFO] [stdout]   --> src/error.rs:69:4
[INFO] [stdout]    |
[INFO] [stdout] 69 | fn e() -> Result<String, LogError> {
[INFO] [stdout]    |    ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/log.rs:61:17
[INFO] [stdout]    |
[INFO] [stdout] 61 |                 self.std_sender.as_ref().unwrap().send(arg);
[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 `std::result::Result` that must be used
[INFO] [stdout]    --> src/log.rs:145:17
[INFO] [stdout]     |
[INFO] [stdout] 145 |                 file.write(s.as_bytes());
[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: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Cell`, `RefCell`
[INFO] [stdout]  --> src/log.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cell::{Cell, RefCell};
[INFO] [stdout]   |                 ^^^^  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Arc`, `Mutex`
[INFO] [stdout]  --> src/log.rs:5:17
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::sync::{Arc, Mutex, RwLock};
[INFO] [stdout]   |                 ^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::sleep`
[INFO] [stdout]  --> src/log.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::thread::sleep;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Duration`
[INFO] [stdout]  --> src/log.rs:8:17
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::time::{Duration, SystemTime};
[INFO] [stdout]   |                 ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `error`, `warn`
[INFO] [stdout]   --> src/log.rs:11:11
[INFO] [stdout]    |
[INFO] [stdout] 11 | use log::{error, info, warn};
[INFO] [stdout]    |           ^^^^^        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `error`
[INFO] [stdout]  --> src/error.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{error, fmt};
[INFO] [stdout]   |           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::prelude`
[INFO] [stdout]   --> src/log.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use tokio::prelude::*;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/log.rs:166:9
[INFO] [stdout]     |
[INFO] [stdout] 166 |     for i in 0..total {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/time_util.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let mut time = SystemTime::now().duration_since(start).unwrap();
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/time_util.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let mut time = SystemTime::now().duration_since(start).unwrap();
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/log.rs:61:17
[INFO] [stdout]    |
[INFO] [stdout] 61 |                 self.std_sender.as_ref().unwrap().send(arg);
[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 `std::result::Result` that must be used
[INFO] [stdout]    --> src/log.rs:145:17
[INFO] [stdout]     |
[INFO] [stdout] 145 |                 file.write(s.as_bytes());
[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: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/log.rs:162:5
[INFO] [stdout]     |
[INFO] [stdout] 162 |     init_log("requests.log", &RuntimeType::Std);
[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: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.47s
[INFO] running `Command { std: "docker" "inspect" "4f79140c7de181c2f8c80dd9578ba8ed9cb952b2dc2c21a3b6ada0e9087ad9d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f79140c7de181c2f8c80dd9578ba8ed9cb952b2dc2c21a3b6ada0e9087ad9d8", kill_on_drop: false }`
[INFO] [stdout] 4f79140c7de181c2f8c80dd9578ba8ed9cb952b2dc2c21a3b6ada0e9087ad9d8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 4ead8dc136b7057d0be50941450ff4b922ca06a4bc9f036a709434298c0d86b7
[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" "4ead8dc136b7057d0be50941450ff4b922ca06a4bc9f036a709434298c0d86b7", kill_on_drop: false }`
[INFO] [stderr] warning: unused imports: `Cell`, `RefCell`
[INFO] [stderr]  --> src/log.rs:1:17
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::cell::{Cell, RefCell};
[INFO] [stderr]   |                 ^^^^  ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Arc`, `Mutex`
[INFO] [stderr]  --> src/log.rs:5:17
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::sync::{Arc, Mutex, RwLock};
[INFO] [stderr]   |                 ^^^  ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::thread::sleep`
[INFO] [stderr]  --> src/log.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::thread::sleep;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Duration`, `SystemTime`
[INFO] [stderr]  --> src/log.rs:8:17
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::time::{Duration, SystemTime};
[INFO] [stderr]   |                 ^^^^^^^^  ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `error`, `info`, `warn`
[INFO] [stderr]   --> src/log.rs:11:11
[INFO] [stderr]    |
[INFO] [stderr] 11 | use log::{error, info, warn};
[INFO] [stderr]    |           ^^^^^  ^^^^  ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::time_util`
[INFO] [stderr]   --> src/log.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 | use crate::time_util;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `error`
[INFO] [stderr]  --> src/error.rs:1:11
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::{error, fmt};
[INFO] [stderr]   |           ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `tokio::prelude`
[INFO] [stderr]   --> src/log.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 | use tokio::prelude::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/time_util.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |     let mut time = SystemTime::now().duration_since(start).unwrap();
[INFO] [stderr]    |         ----^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/time_util.rs:22:9
[INFO] [stderr]    |
[INFO] [stderr] 22 |     let mut time = SystemTime::now().duration_since(start).unwrap();
[INFO] [stderr]    |         ----^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `e`
[INFO] [stderr]   --> src/error.rs:69:4
[INFO] [stderr]    |
[INFO] [stderr] 69 | fn e() -> Result<String, LogError> {
[INFO] [stderr]    |    ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/log.rs:61:17
[INFO] [stderr]    |
[INFO] [stderr] 61 |                 self.std_sender.as_ref().unwrap().send(arg);
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/log.rs:145:17
[INFO] [stderr]     |
[INFO] [stderr] 145 |                 file.write(s.as_bytes());
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 13 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Cell`, `RefCell`
[INFO] [stderr]  --> src/log.rs:1:17
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::cell::{Cell, RefCell};
[INFO] [stderr]   |                 ^^^^  ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Arc`, `Mutex`
[INFO] [stderr]  --> src/log.rs:5:17
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::sync::{Arc, Mutex, RwLock};
[INFO] [stderr]   |                 ^^^  ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::thread::sleep`
[INFO] [stderr]  --> src/log.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::thread::sleep;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Duration`
[INFO] [stderr]  --> src/log.rs:8:17
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::time::{Duration, SystemTime};
[INFO] [stderr]   |                 ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `error`, `warn`
[INFO] [stderr]   --> src/log.rs:11:11
[INFO] [stderr]    |
[INFO] [stderr] 11 | use log::{error, info, warn};
[INFO] [stderr]    |           ^^^^^        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `error`
[INFO] [stderr]  --> src/error.rs:1:11
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::{error, fmt};
[INFO] [stderr]   |           ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `tokio::prelude`
[INFO] [stderr]   --> src/log.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 | use tokio::prelude::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/log.rs:166:9
[INFO] [stderr]     |
[INFO] [stderr] 166 |     for i in 0..total {
[INFO] [stderr]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/time_util.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |     let mut time = SystemTime::now().duration_since(start).unwrap();
[INFO] [stderr]    |         ----^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/time_util.rs:22:9
[INFO] [stderr]    |
[INFO] [stderr] 22 |     let mut time = SystemTime::now().duration_since(start).unwrap();
[INFO] [stderr]    |         ----^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/log.rs:61:17
[INFO] [stderr]    |
[INFO] [stderr] 61 |                 self.std_sender.as_ref().unwrap().send(arg);
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/log.rs:145:17
[INFO] [stderr]     |
[INFO] [stderr] 145 |                 file.write(s.as_bytes());
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/log.rs:162:5
[INFO] [stderr]     |
[INFO] [stderr] 162 |     init_log("requests.log", &RuntimeType::Std);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 13 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.11s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/fast_log-28fe23a6365ea13c
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test error::test_error ... ok
[INFO] [stdout] test time_util::test_count ... ok
[INFO] [stdout] test log::bench_log ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests fast_log
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "4ead8dc136b7057d0be50941450ff4b922ca06a4bc9f036a709434298c0d86b7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4ead8dc136b7057d0be50941450ff4b922ca06a4bc9f036a709434298c0d86b7", kill_on_drop: false }`
[INFO] [stdout] 4ead8dc136b7057d0be50941450ff4b922ca06a4bc9f036a709434298c0d86b7
