[INFO] cloning repository https://github.com/RTK99/rust-beginners
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/RTK99/rust-beginners" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRTK99%2Frust-beginners", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRTK99%2Frust-beginners'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1a0528da4b179c687ab1b7d14662767504ca87db
[INFO] checking RTK99/rust-beginners against try#3bb2879ea9e58d65b875f9a98df44f4a43ce2597 for pr-85387
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRTK99%2Frust-beginners" "/workspace/builds/worker-15/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-15/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/RTK99/rust-beginners on toolchain 3bb2879ea9e58d65b875f9a98df44f4a43ce2597
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3bb2879ea9e58d65b875f9a98df44f4a43ce2597" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/RTK99/rust-beginners
[INFO] finished tweaking git repo https://github.com/RTK99/rust-beginners
[INFO] tweaked toml for git repo https://github.com/RTK99/rust-beginners written to /workspace/builds/worker-15/source/Cargo.toml
[INFO] crate git repo https://github.com/RTK99/rust-beginners already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3bb2879ea9e58d65b875f9a98df44f4a43ce2597" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rand_core v0.3.0
[INFO] [stderr]   Downloaded libc v0.2.47
[INFO] [stderr]   Downloaded rand v0.4.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+3bb2879ea9e58d65b875f9a98df44f4a43ce2597" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 327f8e8b4d30bcc737a3658d503b5454474f55cd919d0129e35ab028092ca56a
[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" "327f8e8b4d30bcc737a3658d503b5454474f55cd919d0129e35ab028092ca56a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "327f8e8b4d30bcc737a3658d503b5454474f55cd919d0129e35ab028092ca56a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "327f8e8b4d30bcc737a3658d503b5454474f55cd919d0129e35ab028092ca56a", kill_on_drop: false }`
[INFO] [stdout] 327f8e8b4d30bcc737a3658d503b5454474f55cd919d0129e35ab028092ca56a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+3bb2879ea9e58d65b875f9a98df44f4a43ce2597" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f0a4a4a8cc2cc83c5f340a417e8e7f78c72d00fe738f99790a9c18e70f0be56b
[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" "f0a4a4a8cc2cc83c5f340a417e8e7f78c72d00fe738f99790a9c18e70f0be56b", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.47
[INFO] [stderr]     Checking structs v0.1.0 (/opt/rustwide/workdir/structs)
[INFO] [stderr]     Checking variables v0.1.0 (/opt/rustwide/workdir/variables)
[INFO] [stderr]     Checking control-flow v0.1.0 (/opt/rustwide/workdir/control-flow)
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> variables/src/main.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let x: i32 = 1111; // With type annotation/
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> variables/src/main.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let x = 1111; // Type will be inferred.
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> variables/src/main.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let x: i32 = 1111; // With type annotation/
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> variables/src/main.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let x = 1111; // Type will be inferred.
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> variables/src/main.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let mut x = "I can be mutable!";
[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 does not need to be mutable
[INFO] [stdout]  --> variables/src/main.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let mut x = "I can be mutable!";
[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: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking rand v0.4.5
[INFO] [stderr]     Checking rand v0.3.22
[INFO] [stderr]     Checking guessing-game v0.1.0 (/opt/rustwide/workdir/guessing-game)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.74s
[INFO] running `Command { std: "docker" "inspect" "f0a4a4a8cc2cc83c5f340a417e8e7f78c72d00fe738f99790a9c18e70f0be56b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f0a4a4a8cc2cc83c5f340a417e8e7f78c72d00fe738f99790a9c18e70f0be56b", kill_on_drop: false }`
[INFO] [stdout] f0a4a4a8cc2cc83c5f340a417e8e7f78c72d00fe738f99790a9c18e70f0be56b