[INFO] fetching crate tapestry 0.1.0...
[INFO] checking tapestry-0.1.0 against try#23ffd2897cbb44320ca18dfe4d05dbacb37d55e0 for pr-115950
[INFO] extracting crate tapestry 0.1.0 into /workspace/builds/worker-7-tc2/source
[INFO] validating manifest of crates.io crate tapestry 0.1.0 on toolchain 23ffd2897cbb44320ca18dfe4d05dbacb37d55e0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+23ffd2897cbb44320ca18dfe4d05dbacb37d55e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate tapestry 0.1.0
[INFO] finished tweaking crates.io crate tapestry 0.1.0
[INFO] tweaked toml for crates.io crate tapestry 0.1.0 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate crates.io crate tapestry 0.1.0 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" "+23ffd2897cbb44320ca18dfe4d05dbacb37d55e0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:4f8da3c744d2da974e54ce020a79f4ad54313e914ebeaab8fc086f07e8d8b066" "/opt/rustwide/cargo-home/bin/cargo" "+23ffd2897cbb44320ca18dfe4d05dbacb37d55e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6e7a9810cc7767c80e90ad0e2c0cde48ac8aec4b5ec62b929c4bda14adacd4ca
[INFO] running `Command { std: "docker" "start" "-a" "6e7a9810cc7767c80e90ad0e2c0cde48ac8aec4b5ec62b929c4bda14adacd4ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6e7a9810cc7767c80e90ad0e2c0cde48ac8aec4b5ec62b929c4bda14adacd4ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6e7a9810cc7767c80e90ad0e2c0cde48ac8aec4b5ec62b929c4bda14adacd4ca", kill_on_drop: false }`
[INFO] [stdout] 6e7a9810cc7767c80e90ad0e2c0cde48ac8aec4b5ec62b929c4bda14adacd4ca
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:4f8da3c744d2da974e54ce020a79f4ad54313e914ebeaab8fc086f07e8d8b066" "/opt/rustwide/cargo-home/bin/cargo" "+23ffd2897cbb44320ca18dfe4d05dbacb37d55e0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0254db77b402bf3b04f02da79f15660b8e55295bf536b4bf7396d0af493069bc
[INFO] running `Command { std: "docker" "start" "-a" "0254db77b402bf3b04f02da79f15660b8e55295bf536b4bf7396d0af493069bc", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.80
[INFO] [stderr]    Compiling getrandom v0.2.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking rand_core v0.6.0
[INFO] [stderr]     Checking rand_chacha v0.3.0
[INFO] [stderr]     Checking rand v0.8.3
[INFO] [stderr]     Checking tapestry v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]   --> examples/dungeon.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 | //         shrink_randomly(
[INFO] [stdout] 33 | ||             Rect {
[INFO] [stdout] 34 | ||                 bottom: room.bottom + 1,
[INFO] [stdout] 35 | ||                 left: room.left + 1,
[INFO] [stdout] ...  ||
[INFO] [stdout] 39 | ||             4,
[INFO] [stdout] 40 | ||         )
[INFO] [stdout]    | ||_________- temporary value created here
[INFO] [stdout] 41 | |          .iter()
[INFO] [stdout]    | |________________^ returns a value referencing data owned by the current function
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `.collect()` to allocate the iterator
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0515`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tapestry` (example "dungeon") due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "0254db77b402bf3b04f02da79f15660b8e55295bf536b4bf7396d0af493069bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0254db77b402bf3b04f02da79f15660b8e55295bf536b4bf7396d0af493069bc", kill_on_drop: false }`
[INFO] [stdout] 0254db77b402bf3b04f02da79f15660b8e55295bf536b4bf7396d0af493069bc