[INFO] cloning repository https://github.com/Sheyne/metaballs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Sheyne/metaballs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSheyne%2Fmetaballs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSheyne%2Fmetaballs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9331d4a41d954e1bbf2f5cf02c1ec79bc4f8e5c1
[INFO] checking Sheyne/metaballs against try#23ffd2897cbb44320ca18dfe4d05dbacb37d55e0 for pr-115950
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSheyne%2Fmetaballs" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Sheyne/metaballs 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 git repo https://github.com/Sheyne/metaballs
[INFO] finished tweaking git repo https://github.com/Sheyne/metaballs
[INFO] tweaked toml for git repo https://github.com/Sheyne/metaballs written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Sheyne/metaballs 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] a29cee31689b84155c740e42a44d4d73c8c8d62ab3a7840d0ceb0b2cbc3e2efb
[INFO] running `Command { std: "docker" "start" "-a" "a29cee31689b84155c740e42a44d4d73c8c8d62ab3a7840d0ceb0b2cbc3e2efb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a29cee31689b84155c740e42a44d4d73c8c8d62ab3a7840d0ceb0b2cbc3e2efb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a29cee31689b84155c740e42a44d4d73c8c8d62ab3a7840d0ceb0b2cbc3e2efb", kill_on_drop: false }`
[INFO] [stdout] a29cee31689b84155c740e42a44d4d73c8c8d62ab3a7840d0ceb0b2cbc3e2efb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 43069c55c03299c63db938f134c2991edeabd6ad506c6b1c886835d9365b8a56
[INFO] running `Command { std: "docker" "start" "-a" "43069c55c03299c63db938f134c2991edeabd6ad506c6b1c886835d9365b8a56", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]     Checking encoding_index_tests v0.1.4
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.5
[INFO] [stderr]    Compiling libc v0.2.107
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]     Checking encoding-index-simpchinese v1.20141219.5
[INFO] [stderr]     Checking encoding-index-singlebyte v1.20141219.5
[INFO] [stderr]     Checking encoding-index-tradchinese v1.20141219.5
[INFO] [stderr]     Checking encoding-index-japanese v1.20141219.5
[INFO] [stderr]     Checking encoding-index-korean v1.20141219.5
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-bigint v0.4.3
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]     Checking crossbeam-channel v0.5.1
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]     Checking adler32 v1.2.0
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking encoding v0.2.33
[INFO] [stderr]     Checking deflate v0.9.1
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking png v0.17.2
[INFO] [stderr]     Checking num-complex v0.4.0
[INFO] [stderr]     Checking num v0.4.0
[INFO] [stderr]     Checking metaballs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]    --> src/main.rs:203:21
[INFO] [stdout]     |
[INFO] [stdout] 203 | //                     find_contour(
[INFO] [stdout] 204 | ||                         threshold,
[INFO] [stdout] 205 | ||                         result[y][x],
[INFO] [stdout] 206 | ||                         result[y][x + 1],
[INFO] [stdout] 207 | ||                         result[y + 1][x],
[INFO] [stdout] 208 | ||                         result[y + 1][x + 1],
[INFO] [stdout] 209 | ||                     )
[INFO] [stdout]     | ||_____________________- temporary value created here
[INFO] [stdout] ...   |
[INFO] [stdout] 219 | |                          },
[INFO] [stdout] 220 | |                      )
[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] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]    --> src/main.rs:203:21
[INFO] [stdout]     |
[INFO] [stdout] 203 | //                     find_contour(
[INFO] [stdout] 204 | ||                         threshold,
[INFO] [stdout] 205 | ||                         result[y][x],
[INFO] [stdout] 206 | ||                         result[y][x + 1],
[INFO] [stdout] 207 | ||                         result[y + 1][x],
[INFO] [stdout] 208 | ||                         result[y + 1][x + 1],
[INFO] [stdout] 209 | ||                     )
[INFO] [stdout]     | ||_____________________- temporary value created here
[INFO] [stdout] ...   |
[INFO] [stdout] 219 | |                          },
[INFO] [stdout] 220 | |                      )
[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] [stderr] error: could not compile `metaballs` (bin "metaballs") due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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 `metaballs` (bin "metaballs" test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "43069c55c03299c63db938f134c2991edeabd6ad506c6b1c886835d9365b8a56", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "43069c55c03299c63db938f134c2991edeabd6ad506c6b1c886835d9365b8a56", kill_on_drop: false }`
[INFO] [stdout] 43069c55c03299c63db938f134c2991edeabd6ad506c6b1c886835d9365b8a56