[INFO] cloning repository https://github.com/lforeverhao/rust_learn
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lforeverhao/rust_learn" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flforeverhao%2Frust_learn", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flforeverhao%2Frust_learn'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5c0fa028aa8343016f141e54ddace34b70347b38
[INFO] checking lforeverhao/rust_learn against master#3aedcf06b73fc36feeebca3d579e1d2a6c40acc5 for pr-65819
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flforeverhao%2Frust_learn" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lforeverhao/rust_learn 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/lforeverhao/rust_learn
[INFO] finished tweaking git repo https://github.com/lforeverhao/rust_learn
[INFO] tweaked toml for git repo https://github.com/lforeverhao/rust_learn written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/lforeverhao/rust_learn 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-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9f95850b994adab1952b4f4129c062e88ddfd63f748c0877c8b90b53f16f5823
[INFO] running `Command { std: "docker" "start" "-a" "9f95850b994adab1952b4f4129c062e88ddfd63f748c0877c8b90b53f16f5823", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9f95850b994adab1952b4f4129c062e88ddfd63f748c0877c8b90b53f16f5823", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f95850b994adab1952b4f4129c062e88ddfd63f748c0877c8b90b53f16f5823", kill_on_drop: false }`
[INFO] [stdout] 9f95850b994adab1952b4f4129c062e88ddfd63f748c0877c8b90b53f16f5823
[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-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] 27a581f381da454ba4b32cebfdf0114d2ad161e36fed0db8a4a2c1ac98533286
[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" "27a581f381da454ba4b32cebfdf0114d2ad161e36fed0db8a4a2c1ac98533286", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]     Checking scopeguard v1.0.0
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]     Checking fnv v1.0.6
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking itoa v0.4.4
[INFO] [stderr]    Compiling httparse v1.3.4
[INFO] [stderr]     Checking scoped-tls v0.1.2
[INFO] [stderr]     Checking test_mod v0.1.0 (/opt/rustwide/workdir/test_mod)
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> test_mod/src/main.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let a = my_mod::A::C {};
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]  --> test_mod/src/main.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let d = my_mod::B::D {};
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> test_mod/src/my_mod.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |         let c = A::C {};
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `side`
[INFO] [stdout]   --> test_mod/src/my_mod.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |         let side = mod_call::OutSide {};
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_side`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b1`
[INFO] [stdout]  --> test_mod/src/mod_call.rs:5:13
[INFO] [stdout]   |
[INFO] [stdout] 5 |         let b1 = B::B1 {};
[INFO] [stdout]   |             ^^ help: if this is intentional, prefix it with an underscore: `_b1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `getC`
[INFO] [stdout]  --> test_mod/src/my_mod.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 |     pub fn getC(){
[INFO] [stdout]   |            ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `getC`
[INFO] [stdout]   --> test_mod/src/my_mod.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn getC(){
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `A1`
[INFO] [stdout]  --> test_mod/src/mod_call.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 |     struct A1;
[INFO] [stdout]   |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fooA`
[INFO] [stdout]  --> test_mod/src/mod_call.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 |     fn fooA(){
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `B1`
[INFO] [stdout]   --> test_mod/src/mod_call.rs:10:16
[INFO] [stdout]    |
[INFO] [stdout] 10 |     pub struct B1;
[INFO] [stdout]    |                ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fooB`
[INFO] [stdout]   --> test_mod/src/mod_call.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn fooB(){}
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `OutSide`
[INFO] [stdout]   --> test_mod/src/mod_call.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub struct OutSide;
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `A` should have a snake case name
[INFO] [stdout]  --> test_mod/src/my_mod.rs:1:9
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub mod A {
[INFO] [stdout]   |         ^ help: convert the identifier to snake case: `a`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `B` should have a snake case name
[INFO] [stdout]  --> test_mod/src/my_mod.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub mod B {
[INFO] [stdout]   |         ^ help: convert the identifier to snake case: `b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `getC` should have a snake case name
[INFO] [stdout]  --> test_mod/src/my_mod.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 |     pub fn getC(){
[INFO] [stdout]   |            ^^^^ help: convert the identifier to snake case: `get_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `getC` should have a snake case name
[INFO] [stdout]   --> test_mod/src/my_mod.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn getC(){
[INFO] [stdout]    |            ^^^^ help: convert the identifier to snake case: `get_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `A` should have a snake case name
[INFO] [stdout]  --> test_mod/src/mod_call.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | mod A {
[INFO] [stdout]   |     ^ help: convert the identifier to snake case: `a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `B` should have a snake case name
[INFO] [stdout]  --> test_mod/src/mod_call.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | mod B{
[INFO] [stdout]   |     ^ help: convert the identifier to snake case: `b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fooA` should have a snake case name
[INFO] [stdout]  --> test_mod/src/mod_call.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 |     fn fooA(){
[INFO] [stdout]   |        ^^^^ help: convert the identifier to snake case: `foo_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fooB` should have a snake case name
[INFO] [stdout]   --> test_mod/src/mod_call.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn fooB(){}
[INFO] [stdout]    |        ^^^^ help: convert the identifier to snake case: `foo_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking test_lifetime v0.1.0 (/opt/rustwide/workdir/test_lifetime)
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> test_lifetime/src/lib.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {}
[INFO] [stdout]   |    ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest`
[INFO] [stdout]   --> test_lifetime/src/lib.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking test_concurrent v0.1.0 (/opt/rustwide/workdir/test_concurrent)
[INFO] [stdout] warning: unused import: `std::sync::mpsc`
[INFO] [stdout]  --> test_concurrent/src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::sync::mpsc;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::Arc`
[INFO] [stdout]  --> test_concurrent/src/thread_test.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::sync::Arc;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `BorrowMut`, `Borrow`
[INFO] [stdout]  --> test_concurrent/src/mutex.rs:1:19
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::borrow::{Borrow, BorrowMut};
[INFO] [stdout]   |                   ^^^^^^  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Cell`, `RefCell`
[INFO] [stdout]  --> test_concurrent/src/arc.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cell::{Cell, RefCell};
[INFO] [stdout]   |                 ^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::time::Duration`
[INFO] [stdout]  --> test_concurrent/src/atomic.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::time::Duration;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> test_concurrent/src/channel.rs:63:9
[INFO] [stdout]    |
[INFO] [stdout] 63 |     for i in 0..10 {
[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: unused variable: `handle`
[INFO] [stdout]   --> test_concurrent/src/channel.rs:65:13
[INFO] [stdout]    |
[INFO] [stdout] 65 |         let handle = thread::spawn(move || {
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_handle`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> test_concurrent/src/channel.rs:72:9
[INFO] [stdout]    |
[INFO] [stdout] 72 |     for x in receiver {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> test_concurrent/src/mutex.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |         for i in 0..COUNT {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> test_concurrent/src/mutex.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |         for i in 0..COUNT {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> test_concurrent/src/mutex.rs:26:13
[INFO] [stdout]    |
[INFO] [stdout] 26 |         for i in 0..COUNT {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]  --> test_concurrent/src/arc.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     for index in 0..10 {
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> test_concurrent/src/atomic.rs:12:13
[INFO] [stdout]    |
[INFO] [stdout] 12 |         for x in 0..COUNT {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> test_concurrent/src/atomic.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |         for x in 0..COUNT {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> test_concurrent/src/atomic.rs:26:13
[INFO] [stdout]    |
[INFO] [stdout] 26 |         for x in 0..COUNT {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> test_concurrent/src/thread_test.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     handle.join();
[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]   --> test_concurrent/src/thread_test.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     handle.join();
[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: variable `arcClone` should have a snake case name
[INFO] [stdout]  --> test_concurrent/src/mutex.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let arcClone = arc.clone();
[INFO] [stdout]   |         ^^^^^^^^ help: convert the identifier to snake case: `arc_clone`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `arcClone1` should have a snake case name
[INFO] [stdout]   --> test_concurrent/src/mutex.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let arcClone1 = arc.clone();
[INFO] [stdout]    |         ^^^^^^^^^ help: convert the identifier to snake case: `arc_clone1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `arcClone2` should have a snake case name
[INFO] [stdout]   --> test_concurrent/src/mutex.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let arcClone2 = arc.clone();
[INFO] [stdout]    |         ^^^^^^^^^ help: convert the identifier to snake case: `arc_clone2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> test_concurrent/src/mutex.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     handle.join();
[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 `Result` that must be used
[INFO] [stdout]   --> test_concurrent/src/mutex.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     handle1.join();
[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 `Result` that must be used
[INFO] [stdout]   --> test_concurrent/src/mutex.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     handle2.join();
[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 `Result` that must be used
[INFO] [stdout]   --> test_concurrent/src/atomic.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     thread.join();
[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 `Result` that must be used
[INFO] [stdout]   --> test_concurrent/src/atomic.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     thread1.join();
[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 `Result` that must be used
[INFO] [stdout]   --> test_concurrent/src/atomic.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     thread2.join();
[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: 26 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking test_api v0.1.0 (/opt/rustwide/workdir/test_api)
[INFO] [stdout] warning: unused import: `Metadata`
[INFO] [stdout]  --> test_api/src/main.rs:1:21
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fs::{File, Metadata, read_to_string};
[INFO] [stdout]   |                     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Error`
[INFO] [stdout]  --> test_api/src/main.rs:2:15
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{Error, Read};
[INFO] [stdout]   |               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]   --> test_api/src/main.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let mut result =
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `file`
[INFO] [stdout]   --> test_api/src/main.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let file = File::open("Cargo.toml1").expect("some thing wrong");
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_file`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]   --> test_api/src/main.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let result = chain.read_to_string(&mut buffer);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]   --> test_api/src/main.rs:63:9
[INFO] [stdout]    |
[INFO] [stdout] 63 |     let result = read_to_string("Cargo.toml");
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> test_api/src/main.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let mut result =
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> test_api/src/main.rs:23:17
[INFO] [stdout]    |
[INFO] [stdout] 23 |                 f.read_to_string(&mut s);
[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: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Metadata`, `read_to_string`
[INFO] [stdout]  --> test_api/src/main.rs:1:21
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fs::{File, Metadata, read_to_string};
[INFO] [stdout]   |                     ^^^^^^^^  ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Error`
[INFO] [stdout]  --> test_api/src/main.rs:2:15
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{Error, Read};
[INFO] [stdout]   |               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `process_err`
[INFO] [stdout]   --> test_api/src/main.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn process_err(s: String) -> io::Result<String> {
[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] [stdout] error[E0425]: cannot find function `longest1` in this scope
[INFO] [stdout]   --> test_lifetime/src/lib.rs:34:20
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]    | ------------------------------------------------- similarly named function `longest` defined here
[INFO] [stdout] ...
[INFO] [stdout] 34 |     let longest1 = longest1("1", "2");
[INFO] [stdout]    |                    ^^^^^^^^ help: a function with a similar name exists: `longest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0425`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `test_lifetime`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "27a581f381da454ba4b32cebfdf0114d2ad161e36fed0db8a4a2c1ac98533286", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "27a581f381da454ba4b32cebfdf0114d2ad161e36fed0db8a4a2c1ac98533286", kill_on_drop: false }`
[INFO] [stdout] 27a581f381da454ba4b32cebfdf0114d2ad161e36fed0db8a4a2c1ac98533286