[INFO] cloning repository https://github.com/rmazza/rust-tutorial
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rmazza/rust-tutorial" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frmazza%2Frust-tutorial", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frmazza%2Frust-tutorial'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0f152feb4f3a39888eb79cfb99b8d758c50fdba6
[INFO] checking rmazza/rust-tutorial against try#07fecb9cf34c4979a772ba38c99d6d9144768413 for pr-87710
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frmazza%2Frust-tutorial" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rmazza/rust-tutorial on toolchain 07fecb9cf34c4979a772ba38c99d6d9144768413
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/rmazza/rust-tutorial
[INFO] finished tweaking git repo https://github.com/rmazza/rust-tutorial
[INFO] tweaked toml for git repo https://github.com/rmazza/rust-tutorial written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/rmazza/rust-tutorial already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 327694d68e952bc6456b7527509417fe9bd17433a4fa36005343e7bc3e5f5060
[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" "327694d68e952bc6456b7527509417fe9bd17433a4fa36005343e7bc3e5f5060", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "327694d68e952bc6456b7527509417fe9bd17433a4fa36005343e7bc3e5f5060", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "327694d68e952bc6456b7527509417fe9bd17433a4fa36005343e7bc3e5f5060", kill_on_drop: false }`
[INFO] [stdout] 327694d68e952bc6456b7527509417fe9bd17433a4fa36005343e7bc3e5f5060
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9ae30861cb486492bb31983c9075a01bec64d061225ba6f211582b907e963ee8
[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" "9ae30861cb486492bb31983c9075a01bec64d061225ba6f211582b907e963ee8", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-tutorial v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/main.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let s = "hello";
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/main.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let t = String::from("hello");
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `number`
[INFO] [stdout]    --> src/main.rs:137:13
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let mut number = 3;
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_number`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:137:9
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let mut number = 3;
[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 `heapString` should have a snake case name
[INFO] [stdout]   --> src/main.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let heapString = String::from("hello");  // s comes into scope
[INFO] [stdout]    |         ^^^^^^^^^^ help: convert the identifier to snake case: `heap_string`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `stackX` should have a snake case name
[INFO] [stdout]   --> src/main.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let stackX = 5;                      // x comes into scope
[INFO] [stdout]    |         ^^^^^^ help: convert the identifier to snake case: `stack_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/main.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let s = "hello";
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/main.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let t = String::from("hello");
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `number`
[INFO] [stdout]    --> src/main.rs:137:13
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let mut number = 3;
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_number`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:137:9
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let mut number = 3;
[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 `heapString` should have a snake case name
[INFO] [stdout]   --> src/main.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let heapString = String::from("hello");  // s comes into scope
[INFO] [stdout]    |         ^^^^^^^^^^ help: convert the identifier to snake case: `heap_string`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `stackX` should have a snake case name
[INFO] [stdout]   --> src/main.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let stackX = 5;                      // x comes into scope
[INFO] [stdout]    |         ^^^^^^ help: convert the identifier to snake case: `stack_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.59s
[INFO] running `Command { std: "docker" "inspect" "9ae30861cb486492bb31983c9075a01bec64d061225ba6f211582b907e963ee8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ae30861cb486492bb31983c9075a01bec64d061225ba6f211582b907e963ee8", kill_on_drop: false }`
[INFO] [stdout] 9ae30861cb486492bb31983c9075a01bec64d061225ba6f211582b907e963ee8