[INFO] fetching crate symmetric-shadowcasting 0.2.0...
[INFO] checking symmetric-shadowcasting-0.2.0 against try#23ffd2897cbb44320ca18dfe4d05dbacb37d55e0 for pr-115950
[INFO] extracting crate symmetric-shadowcasting 0.2.0 into /workspace/builds/worker-3-tc2/source
[INFO] validating manifest of crates.io crate symmetric-shadowcasting 0.2.0 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 symmetric-shadowcasting 0.2.0
[INFO] finished tweaking crates.io crate symmetric-shadowcasting 0.2.0
[INFO] tweaked toml for crates.io crate symmetric-shadowcasting 0.2.0 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+23ffd2897cbb44320ca18dfe4d05dbacb37d55e0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 699f533fbb430b83103d173d0df6a49bb6585dc0541ea65a0e750bf9a6741010
[INFO] running `Command { std: "docker" "start" "-a" "699f533fbb430b83103d173d0df6a49bb6585dc0541ea65a0e750bf9a6741010", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "699f533fbb430b83103d173d0df6a49bb6585dc0541ea65a0e750bf9a6741010", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "699f533fbb430b83103d173d0df6a49bb6585dc0541ea65a0e750bf9a6741010", kill_on_drop: false }`
[INFO] [stdout] 699f533fbb430b83103d173d0df6a49bb6585dc0541ea65a0e750bf9a6741010
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 93557b7cd882d265da23ebf77dab52de06f1139849db9cfee318927c5227ae0f
[INFO] running `Command { std: "docker" "start" "-a" "93557b7cd882d265da23ebf77dab52de06f1139849db9cfee318927c5227ae0f", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling num-traits v0.2.16
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]     Checking symmetric-shadowcasting v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0506]: cannot assign to `row.start_slope` because it is borrowed
[INFO] [stdout]   --> src/shadowcast.rs:58:13
[INFO] [stdout]    |
[INFO] [stdout] 44 |     for tile in row.tiles() {
[INFO] [stdout]    |                 -----------
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 `row.start_slope` is borrowed here
[INFO] [stdout]    |                 borrow later used here
[INFO] [stdout] ...
[INFO] [stdout] 58 |             row.start_slope = slope(tile);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `row.start_slope` is assigned to here but it was already borrowed
[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 E0506`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `symmetric-shadowcasting` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0506]: cannot assign to `row.start_slope` because it is borrowed
[INFO] [stdout]   --> src/shadowcast.rs:58:13
[INFO] [stdout]    |
[INFO] [stdout] 44 |     for tile in row.tiles() {
[INFO] [stdout]    |                 -----------
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 `row.start_slope` is borrowed here
[INFO] [stdout]    |                 borrow later used here
[INFO] [stdout] ...
[INFO] [stdout] 58 |             row.start_slope = slope(tile);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `row.start_slope` is assigned to here but it was already borrowed
[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 E0506`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `symmetric-shadowcasting` (lib test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "93557b7cd882d265da23ebf77dab52de06f1139849db9cfee318927c5227ae0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "93557b7cd882d265da23ebf77dab52de06f1139849db9cfee318927c5227ae0f", kill_on_drop: false }`
[INFO] [stdout] 93557b7cd882d265da23ebf77dab52de06f1139849db9cfee318927c5227ae0f