[INFO] fetching crate rand 0.10.0-rc.5...
[INFO] checking rand-0.10.0-rc.5 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate rand 0.10.0-rc.5 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate rand 0.10.0-rc.5
[INFO] finished tweaking crates.io crate rand 0.10.0-rc.5
[INFO] tweaked toml for crates.io crate rand 0.10.0-rc.5 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate rand 0.10.0-rc.5 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate rand 0.10.0-rc.5 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] da6cc451017e2b6551fb18821d75a3bd6866fbaaee44c93b61cae23523b6e1cb
[INFO] running `Command { std: "docker" "start" "-a" "da6cc451017e2b6551fb18821d75a3bd6866fbaaee44c93b61cae23523b6e1cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "da6cc451017e2b6551fb18821d75a3bd6866fbaaee44c93b61cae23523b6e1cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "da6cc451017e2b6551fb18821d75a3bd6866fbaaee44c93b61cae23523b6e1cb", kill_on_drop: false }`
[INFO] [stdout] da6cc451017e2b6551fb18821d75a3bd6866fbaaee44c93b61cae23523b6e1cb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 02d02878346658eed0474302b19bba06c87875cea171d7a56da81f56ba431e64
[INFO] running `Command { std: "docker" "start" "-a" "02d02878346658eed0474302b19bba06c87875cea171d7a56da81f56ba431e64", kill_on_drop: false }`
[INFO] [stderr]     Checking rand_core v0.10.0-rc-2
[INFO] [stderr]     Checking getrandom v0.3.4
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking chacha20 v0.10.0-rc.5
[INFO] [stderr]     Checking rand_pcg v0.10.0-rc.1
[INFO] [stderr]     Checking rand v0.10.0-rc.5 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<ReseedingRng<ChaCha12Core, StepRng>, Infallible>
[INFO] [stdout]    --> src/rngs/reseeding.rs:235:29
[INFO] [stdout]     |
[INFO] [stdout] 235 |         let mut reseeding = ReseedingRng::<Core, _>::new(thresh, zero).unwrap();
[INFO] [stdout]     |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rand` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "02d02878346658eed0474302b19bba06c87875cea171d7a56da81f56ba431e64", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "02d02878346658eed0474302b19bba06c87875cea171d7a56da81f56ba431e64", kill_on_drop: false }`
[INFO] [stdout] 02d02878346658eed0474302b19bba06c87875cea171d7a56da81f56ba431e64