[INFO] cloning repository https://github.com/caoyx1990/LearnRustProject
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/caoyx1990/LearnRustProject" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcaoyx1990%2FLearnRustProject", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcaoyx1990%2FLearnRustProject'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d8766f700769d3d79b77e9fb370a4e83d7935224
[INFO] checking caoyx1990/LearnRustProject against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcaoyx1990%2FLearnRustProject" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/caoyx1990/LearnRustProject on toolchain 1f12b9b0fdbe735968ac002792a720f0ba4faca6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/caoyx1990/LearnRustProject
[INFO] finished tweaking git repo https://github.com/caoyx1990/LearnRustProject
[INFO] tweaked toml for git repo https://github.com/caoyx1990/LearnRustProject written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/caoyx1990/LearnRustProject already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking caoyx1990/LearnRustProject against try#f9935d29d867449445ee008640ccca1bf1ae0889+rustflags=-Dtail_expr_drop_order for crater-rollup-uwu
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcaoyx1990%2FLearnRustProject" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/caoyx1990/LearnRustProject on toolchain f9935d29d867449445ee008640ccca1bf1ae0889
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f9935d29d867449445ee008640ccca1bf1ae0889" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/caoyx1990/LearnRustProject
[INFO] finished tweaking git repo https://github.com/caoyx1990/LearnRustProject
[INFO] tweaked toml for git repo https://github.com/caoyx1990/LearnRustProject written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/caoyx1990/LearnRustProject already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f9935d29d867449445ee008640ccca1bf1ae0889" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+f9935d29d867449445ee008640ccca1bf1ae0889" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a370b892945384af325f8de43fd4c4c43607ead93b6da39eb6a91187c81200ad
[INFO] running `Command { std: "docker" "start" "-a" "a370b892945384af325f8de43fd4c4c43607ead93b6da39eb6a91187c81200ad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a370b892945384af325f8de43fd4c4c43607ead93b6da39eb6a91187c81200ad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a370b892945384af325f8de43fd4c4c43607ead93b6da39eb6a91187c81200ad", kill_on_drop: false }`
[INFO] [stdout] a370b892945384af325f8de43fd4c4c43607ead93b6da39eb6a91187c81200ad
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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=forbid -Dtail_expr_drop_order" "-e" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+f9935d29d867449445ee008640ccca1bf1ae0889" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bf74d060b017a11a610ed7ba5d7c7529c7e871a22a35a173e2ed7b127dd63cb4
[INFO] running `Command { std: "docker" "start" "-a" "bf74d060b017a11a610ed7ba5d7c7529c7e871a22a35a173e2ed7b127dd63cb4", kill_on_drop: false }`
[INFO] [stderr]     Checking LearnRustProject v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::net::IpAddr`
[INFO] [stdout]  --> src/001.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::net::IpAddr;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::print_a_b`
[INFO] [stdout]    --> src/001.rs:247:9
[INFO] [stdout]     |
[INFO] [stdout] 247 |     use crate::print_a_b;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: if this is a test module, consider adding a `#[cfg(test)]` to the containing module
[INFO] [stdout]    --> src/001.rs:246:1
[INFO] [stdout]     |
[INFO] [stdout] 246 | mod tests {
[INFO] [stdout]     | ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::net::IpAddr`
[INFO] [stdout]  --> src/001.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::net::IpAddr;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/001.rs:263:34
[INFO] [stdout]     |
[INFO] [stdout] 263 | fn print_a_b(a: i32, b: char) -> (i32) {
[INFO] [stdout]     |                                  ^   ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 263 - fn print_a_b(a: i32, b: char) -> (i32) {
[INFO] [stdout] 263 + fn print_a_b(a: i32, b: char) -> i32 {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/001.rs:263:34
[INFO] [stdout]     |
[INFO] [stdout] 263 | fn print_a_b(a: i32, b: char) -> (i32) {
[INFO] [stdout]     |                                  ^   ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 263 - fn print_a_b(a: i32, b: char) -> (i32) {
[INFO] [stdout] 263 + fn print_a_b(a: i32, b: char) -> i32 {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/001.rs:48:9
[INFO] [stdout]    |
[INFO] [stdout] 48 |     let hello = String::from("你好");
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/001.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |     let a: [i32; 5] = [1,2,3,4,5];
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]    --> src/001.rs:105:9
[INFO] [stdout]     |
[INFO] [stdout] 105 |     let v: Vec<i32> = Vec::new();
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]    --> src/001.rs:106:9
[INFO] [stdout]     |
[INFO] [stdout] 106 |     let v = vec![1,2,3];
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/001.rs:48:9
[INFO] [stdout]    |
[INFO] [stdout] 48 |     let hello = String::from("你好");
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/001.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |     let a: [i32; 5] = [1,2,3,4,5];
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]    --> src/001.rs:105:9
[INFO] [stdout]     |
[INFO] [stdout] 105 |     let v: Vec<i32> = Vec::new();
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]    --> src/001.rs:106:9
[INFO] [stdout]     |
[INFO] [stdout] 106 |     let v = vec![1,2,3];
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `active`, `username`, `email`, and `age` are never read
[INFO] [stdout]    --> src/001.rs:272:5
[INFO] [stdout]     |
[INFO] [stdout] 271 | struct User {
[INFO] [stdout]     |        ---- fields in this struct
[INFO] [stdout] 272 |     active: bool,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 273 |     username: String,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 274 |     email: String,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 275 |     age: u64
[INFO] [stdout]     |     ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `User` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `active`, `username`, `email`, and `age` are never read
[INFO] [stdout]    --> src/001.rs:272:5
[INFO] [stdout]     |
[INFO] [stdout] 271 | struct User {
[INFO] [stdout]     |        ---- fields in this struct
[INFO] [stdout] 272 |     active: bool,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 273 |     username: String,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 274 |     email: String,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 275 |     age: u64
[INFO] [stdout]     |     ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `User` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.07s
[INFO] running `Command { std: "docker" "inspect" "bf74d060b017a11a610ed7ba5d7c7529c7e871a22a35a173e2ed7b127dd63cb4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bf74d060b017a11a610ed7ba5d7c7529c7e871a22a35a173e2ed7b127dd63cb4", kill_on_drop: false }`
[INFO] [stdout] bf74d060b017a11a610ed7ba5d7c7529c7e871a22a35a173e2ed7b127dd63cb4