[INFO] cloning repository https://github.com/laopo001/rust_playground
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/laopo001/rust_playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flaopo001%2Frust_playground"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flaopo001%2Frust_playground'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 081a79964199323072a1af2b97d8506cf8734735
[INFO] checking laopo001/rust_playground against master#914adf04af1c1a984707f778da3d04590c03d144 for pr-72331
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flaopo001%2Frust_playground" "/workspace/builds/worker-7/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/laopo001/rust_playground on toolchain 914adf04af1c1a984707f778da3d04590c03d144
[INFO] running `"/workspace/cargo-home/bin/cargo" "+914adf04af1c1a984707f778da3d04590c03d144" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/laopo001/rust_playground
[INFO] finished tweaking git repo https://github.com/laopo001/rust_playground
[INFO] tweaked toml for git repo https://github.com/laopo001/rust_playground written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/laopo001/rust_playground already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+914adf04af1c1a984707f778da3d04590c03d144" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+914adf04af1c1a984707f778da3d04590c03d144" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 3eeb0d6a0febf1a3bc6441d81e2355f7853991cd6bc6283f08560e77aa10019f
[INFO] running `"docker" "start" "-a" "3eeb0d6a0febf1a3bc6441d81e2355f7853991cd6bc6283f08560e77aa10019f"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling libc v0.2.70
[INFO] [stderr]     Checking regex-syntax v0.6.17
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking regex v1.3.7
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking rust_playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `std::collections::HashMap`
[INFO] [stderr]  --> src/bin/main.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::collections::HashMap;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]   --> src/bin/main.rs:15:8
[INFO] [stderr]    |
[INFO] [stderr] 15 | fn abc(a: &str) {}
[INFO] [stderr]    |        ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::HashMap`
[INFO] [stderr]  --> src/bin/main.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::collections::HashMap;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `T`
[INFO] [stderr]  --> src/bin/main2.rs:3:8
[INFO] [stderr]   |
[INFO] [stderr] 3 | struct T<'a> {
[INFO] [stderr]   |        ^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `A`
[INFO] [stderr]  --> src/bin/main2.rs:6:8
[INFO] [stderr]   |
[INFO] [stderr] 6 | struct A<'a> {
[INFO] [stderr]   |        ^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `set_t`
[INFO] [stderr]   --> src/bin/main2.rs:11:12
[INFO] [stderr]    |
[INFO] [stderr] 11 |     pub fn set_t(&mut self) {
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `z`
[INFO] [stderr]   --> src/bin/main4.rs:10:13
[INFO] [stderr]    |
[INFO] [stderr] 10 |         let z = x.borrow();     //编译时会通过，但运行时panic!
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `T`
[INFO] [stderr]  --> src/bin/main2.rs:3:8
[INFO] [stderr]   |
[INFO] [stderr] 3 | struct T<'a> {
[INFO] [stderr]   |        ^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `A`
[INFO] [stderr]  --> src/bin/main2.rs:6:8
[INFO] [stderr]   |
[INFO] [stderr] 6 | struct A<'a> {
[INFO] [stderr]   |        ^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `set_t`
[INFO] [stderr]   --> src/bin/main2.rs:11:12
[INFO] [stderr]    |
[INFO] [stderr] 11 |     pub fn set_t(&mut self) {
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `z`
[INFO] [stderr]   --> src/bin/main4.rs:10:13
[INFO] [stderr]    |
[INFO] [stderr] 10 |         let z = x.borrow();     //编译时会通过，但运行时panic!
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]   --> src/bin/main.rs:15:8
[INFO] [stderr]    |
[INFO] [stderr] 15 | fn abc(a: &str) {}
[INFO] [stderr]    |        ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/bin/main5.rs:10:8
[INFO] [stderr]    |
[INFO] [stderr] 10 |     fn new(mut a: A) -> B {
[INFO] [stderr]    |        ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/bin/main5.rs:10:8
[INFO] [stderr]    |
[INFO] [stderr] 10 |     fn new(mut a: A) -> B {
[INFO] [stderr]    |        ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.42s
[INFO] running `"docker" "inspect" "3eeb0d6a0febf1a3bc6441d81e2355f7853991cd6bc6283f08560e77aa10019f"`
[INFO] running `"docker" "rm" "-f" "3eeb0d6a0febf1a3bc6441d81e2355f7853991cd6bc6283f08560e77aa10019f"`
[INFO] [stdout] 3eeb0d6a0febf1a3bc6441d81e2355f7853991cd6bc6283f08560e77aa10019f