[INFO] fetching crate fanova 0.2.0...
[INFO] checking fanova-0.2.0 against try#23ffd2897cbb44320ca18dfe4d05dbacb37d55e0 for pr-115950
[INFO] extracting crate fanova 0.2.0 into /workspace/builds/worker-2-tc2/source
[INFO] validating manifest of crates.io crate fanova 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 fanova 0.2.0
[INFO] finished tweaking crates.io crate fanova 0.2.0
[INFO] tweaked toml for crates.io crate fanova 0.2.0 written to /workspace/builds/worker-2-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-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] d8c444f3f8c0b3f03cddfe56b60d200b58f58ef51c69293448c91b35588bf41d
[INFO] running `Command { std: "docker" "start" "-a" "d8c444f3f8c0b3f03cddfe56b60d200b58f58ef51c69293448c91b35588bf41d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d8c444f3f8c0b3f03cddfe56b60d200b58f58ef51c69293448c91b35588bf41d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d8c444f3f8c0b3f03cddfe56b60d200b58f58ef51c69293448c91b35588bf41d", kill_on_drop: false }`
[INFO] [stdout] d8c444f3f8c0b3f03cddfe56b60d200b58f58ef51c69293448c91b35588bf41d
[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] 54caa043c61823c438277ca6812845f79ba153c039c4e82236fa8e9cdafa747b
[INFO] running `Command { std: "docker" "start" "-a" "54caa043c61823c438277ca6812845f79ba153c039c4e82236fa8e9cdafa747b", kill_on_drop: false }`
[INFO] [stderr]     Checking memchr v2.6.3
[INFO] [stderr]     Checking num-traits v0.2.16
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stderr]     Checking criterion-plot v0.4.5
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking csv v1.2.2
[INFO] [stderr]     Checking ordered-float v3.9.1
[INFO] [stderr]     Checking plotters v0.3.5
[INFO] [stderr]     Checking fanova v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking criterion v0.3.6
[INFO] [stdout] error[E0502]: cannot borrow `fanova` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/fanova.rs:409:18
[INFO] [stdout]     |
[INFO] [stdout] 407 |         let importances = fanova
[INFO] [stdout]     |                           ------ immutable borrow occurs here
[INFO] [stdout] 408 |             .feature_combinations(2)
[INFO] [stdout] 409 |             .map(|i| fanova.quantify_importance(&i).mean)
[INFO] [stdout]     |              --- ^^^ ------ second borrow occurs due to use of `fanova` in closure
[INFO] [stdout]     |              |   |
[INFO] [stdout]     |              |   mutable borrow occurs here
[INFO] [stdout]     |              immutable borrow later used by call
[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 E0502`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `fanova` (lib test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "54caa043c61823c438277ca6812845f79ba153c039c4e82236fa8e9cdafa747b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54caa043c61823c438277ca6812845f79ba153c039c4e82236fa8e9cdafa747b", kill_on_drop: false }`
[INFO] [stdout] 54caa043c61823c438277ca6812845f79ba153c039c4e82236fa8e9cdafa747b