[INFO] cloning repository https://github.com/Johan-Liebert1/crust_of_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Johan-Liebert1/crust_of_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJohan-Liebert1%2Fcrust_of_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJohan-Liebert1%2Fcrust_of_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 954ea8fa2dd37a71868492fe1428e1308ba33bf2
[INFO] checking Johan-Liebert1/crust_of_rust against master#22572d0994593197593e2a1b7b18d720a9a349a7 for pr-126452-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJohan-Liebert1%2Fcrust_of_rust" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Johan-Liebert1/crust_of_rust on toolchain 22572d0994593197593e2a1b7b18d720a9a349a7
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Johan-Liebert1/crust_of_rust
[INFO] finished tweaking git repo https://github.com/Johan-Liebert1/crust_of_rust
[INFO] tweaked toml for git repo https://github.com/Johan-Liebert1/crust_of_rust written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/Johan-Liebert1/crust_of_rust 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" "+22572d0994593197593e2a1b7b18d720a9a349a7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f4bbaedc368345ee8377243182ae5fa3c5daf9f8d17b6187966948cbc8cf0659
[INFO] running `Command { std: "docker" "start" "-a" "f4bbaedc368345ee8377243182ae5fa3c5daf9f8d17b6187966948cbc8cf0659", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f4bbaedc368345ee8377243182ae5fa3c5daf9f8d17b6187966948cbc8cf0659", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f4bbaedc368345ee8377243182ae5fa3c5daf9f8d17b6187966948cbc8cf0659", kill_on_drop: false }`
[INFO] [stdout] f4bbaedc368345ee8377243182ae5fa3c5daf9f8d17b6187966948cbc8cf0659
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eef0fe6172a73605cd3c811a8e1d072ad73b68a8d2fbd9759bf2032d37b8a412
[INFO] running `Command { std: "docker" "start" "-a" "eef0fe6172a73605cd3c811a8e1d072ad73b68a8d2fbd9759bf2032d37b8a412", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]     Checking getrandom v0.2.7
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking crust_of_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/s4_smart_pointers_interior_mutability/rc.rs:101:17
[INFO] [stdout]     |
[INFO] [stdout] 101 |                 drop(inner);
[INFO] [stdout]     |                 ^^^^^-----^
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      argument has type `&RcInner<T>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 101 -                 drop(inner);
[INFO] [stdout] 101 +                 let _ = inner;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/s4_smart_pointers_interior_mutability/rc.rs:101:17
[INFO] [stdout]     |
[INFO] [stdout] 101 |                 drop(inner);
[INFO] [stdout]     |                 ^^^^^-----^
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      argument has type `&RcInner<T>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 101 -                 drop(inner);
[INFO] [stdout] 101 +                 let _ = inner;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Box::<T>::from_raw` that must be used
[INFO] [stdout]   --> src/s7_drop_check/drop_check.rs:16:18
[INFO] [stdout]    |
[INFO] [stdout] 16 |         unsafe { Box::from_raw(self.p.as_mut()) };
[INFO] [stdout]    |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: call `drop(Box::from_raw(ptr))` if you intend to drop the `Box`
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 16 |         unsafe { let _ = Box::from_raw(self.p.as_mut()); };
[INFO] [stdout]    |                  +++++++                               +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Box::<T>::from_raw` that must be used
[INFO] [stdout]   --> src/s7_drop_check/drop_check.rs:16:18
[INFO] [stdout]    |
[INFO] [stdout] 16 |         unsafe { Box::from_raw(self.p.as_mut()) };
[INFO] [stdout]    |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: call `drop(Box::from_raw(ptr))` if you intend to drop the `Box`
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 16 |         unsafe { let _ = Box::from_raw(self.p.as_mut()); };
[INFO] [stdout]    |                  +++++++                               +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.39s
[INFO] running `Command { std: "docker" "inspect" "eef0fe6172a73605cd3c811a8e1d072ad73b68a8d2fbd9759bf2032d37b8a412", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eef0fe6172a73605cd3c811a8e1d072ad73b68a8d2fbd9759bf2032d37b8a412", kill_on_drop: false }`
[INFO] [stdout] eef0fe6172a73605cd3c811a8e1d072ad73b68a8d2fbd9759bf2032d37b8a412