[INFO] cloning repository https://github.com/guildenstern70/RustLearn
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/guildenstern70/RustLearn" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguildenstern70%2FRustLearn", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguildenstern70%2FRustLearn'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a3fe617b19b37f88de9c906e26f25c4398c6ca1f
[INFO] checking guildenstern70/RustLearn against try#012cd62c9add58ab3910e44c137d87db3ab70f61 for pr-155915
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguildenstern70%2FRustLearn" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/guildenstern70/RustLearn
[INFO] finished tweaking git repo https://github.com/guildenstern70/RustLearn
[INFO] tweaked toml for git repo https://github.com/guildenstern70/RustLearn written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/guildenstern70/RustLearn on toolchain 012cd62c9add58ab3910e44c137d87db3ab70f61
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+012cd62c9add58ab3910e44c137d87db3ab70f61" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/guildenstern70/RustLearn 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" "+012cd62c9add58ab3910e44c137d87db3ab70f61" "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-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+012cd62c9add58ab3910e44c137d87db3ab70f61" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2f59a3eb39a8c17623f4e54bb84ad4df4992c5d0a5482aea15d8a0c531aaf6bf
[INFO] running `Command { std: "docker" "start" "-a" "2f59a3eb39a8c17623f4e54bb84ad4df4992c5d0a5482aea15d8a0c531aaf6bf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2f59a3eb39a8c17623f4e54bb84ad4df4992c5d0a5482aea15d8a0c531aaf6bf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f59a3eb39a8c17623f4e54bb84ad4df4992c5d0a5482aea15d8a0c531aaf6bf", kill_on_drop: false }`
[INFO] [stdout] 2f59a3eb39a8c17623f4e54bb84ad4df4992c5d0a5482aea15d8a0c531aaf6bf
[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" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+012cd62c9add58ab3910e44c137d87db3ab70f61" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 85c49bf4547cd668910ac8f66c00f960bde0f7389b34603a355f0f664c7234b5
[INFO] running `Command { std: "docker" "start" "-a" "85c49bf4547cd668910ac8f66c00f960bde0f7389b34603a355f0f664c7234b5", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_learn v0.1.7 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `counter` is never read
[INFO] [stdout]   --> src/loops.rs:8:23
[INFO] [stdout]    |
[INFO] [stdout]  8 |     let mut counter = 0;
[INFO] [stdout]    |                       ^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 15 |     counter = 0;
[INFO] [stdout]    |     ----------- `counter` is overwritten here before the previous value is read
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `counter` is never read
[INFO] [stdout]   --> src/loops.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |         counter += x;
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `counter` is never read
[INFO] [stdout]   --> src/loops.rs:8:23
[INFO] [stdout]    |
[INFO] [stdout]  8 |     let mut counter = 0;
[INFO] [stdout]    |                       ^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 15 |     counter = 0;
[INFO] [stdout]    |     ----------- `counter` is overwritten here before the previous value is read
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `counter` is never read
[INFO] [stdout]   --> src/loops.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |         counter += x;
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.08s
[INFO] running `Command { std: "docker" "inspect" "85c49bf4547cd668910ac8f66c00f960bde0f7389b34603a355f0f664c7234b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "85c49bf4547cd668910ac8f66c00f960bde0f7389b34603a355f0f664c7234b5", kill_on_drop: false }`
[INFO] [stdout] 85c49bf4547cd668910ac8f66c00f960bde0f7389b34603a355f0f664c7234b5
