[INFO] cloning repository https://github.com/Xedon/rust_workshop
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Xedon/rust_workshop" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FXedon%2Frust_workshop", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FXedon%2Frust_workshop'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5df7f56137bbc5afc828b4378f016ad869cf7760
[INFO] checking Xedon/rust_workshop against master#33fdb797f59421c7bbecaa4588ed5d7a31a9494a for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FXedon%2Frust_workshop" "/workspace/builds/worker-67/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-67/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Xedon/rust_workshop on toolchain 33fdb797f59421c7bbecaa4588ed5d7a31a9494a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Xedon/rust_workshop
[INFO] finished tweaking git repo https://github.com/Xedon/rust_workshop
[INFO] tweaked toml for git repo https://github.com/Xedon/rust_workshop written to /workspace/builds/worker-67/source/Cargo.toml
[INFO] crate git repo https://github.com/Xedon/rust_workshop already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1f99bda23548d14b18d2b5d0d06630acc8e29fc178e866d46195477f50218c6a
[INFO] running `Command { std: "docker" "start" "-a" "1f99bda23548d14b18d2b5d0d06630acc8e29fc178e866d46195477f50218c6a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1f99bda23548d14b18d2b5d0d06630acc8e29fc178e866d46195477f50218c6a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f99bda23548d14b18d2b5d0d06630acc8e29fc178e866d46195477f50218c6a", kill_on_drop: false }`
[INFO] [stdout] 1f99bda23548d14b18d2b5d0d06630acc8e29fc178e866d46195477f50218c6a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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" "-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 16c87b2666b3f95d4d91269c2abcd3f787f86bd73df4be57d09c1c0ae5669b14
[INFO] running `Command { std: "docker" "start" "-a" "16c87b2666b3f95d4d91269c2abcd3f787f86bd73df4be57d09c1c0ae5669b14", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking rust-starter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `str`
[INFO] [stdout]  --> examples/1_primitves.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let str = "str";
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_str`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string`
[INFO] [stdout]  --> examples/1_primitves.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let string = String::from("string");
[INFO] [stdout]   |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> examples/1_primitves.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let x = 1;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> examples/1_primitves.rs:42:13
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let mut x = "a";
[INFO] [stdout]    |             ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> examples/1_primitves.rs:49:13
[INFO] [stdout]    |
[INFO] [stdout] 49 |         let x = x;
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Error`
[INFO] [stdout]   --> examples/3_flow_control.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |         Error(String),
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.47s
[INFO] running `Command { std: "docker" "inspect" "16c87b2666b3f95d4d91269c2abcd3f787f86bd73df4be57d09c1c0ae5669b14", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "16c87b2666b3f95d4d91269c2abcd3f787f86bd73df4be57d09c1c0ae5669b14", kill_on_drop: false }`
[INFO] [stdout] 16c87b2666b3f95d4d91269c2abcd3f787f86bd73df4be57d09c1c0ae5669b14