[INFO] fetching crate generic_once_cell 0.1.1...
[INFO] checking generic_once_cell-0.1.1 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate generic_once_cell 0.1.1 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate generic_once_cell 0.1.1
[INFO] finished tweaking crates.io crate generic_once_cell 0.1.1
[INFO] tweaked toml for crates.io crate generic_once_cell 0.1.1 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate generic_once_cell 0.1.1 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 11 packages to latest compatible versions
[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] 286f7270fd706db830a5e19d8844e3ee030c3acf2e8934475e1a275a24ea0fa4
[INFO] running `Command { std: "docker" "start" "-a" "286f7270fd706db830a5e19d8844e3ee030c3acf2e8934475e1a275a24ea0fa4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "286f7270fd706db830a5e19d8844e3ee030c3acf2e8934475e1a275a24ea0fa4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "286f7270fd706db830a5e19d8844e3ee030c3acf2e8934475e1a275a24ea0fa4", kill_on_drop: false }`
[INFO] [stdout] 286f7270fd706db830a5e19d8844e3ee030c3acf2e8934475e1a275a24ea0fa4
[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] 4563dce3ca8c2e9697fbe14c1160b8c2672d5d86658e939ab89e02d1aa741941
[INFO] running `Command { std: "docker" "start" "-a" "4563dce3ca8c2e9697fbe14c1160b8c2672d5d86658e939ab89e02d1aa741941", kill_on_drop: false }`
[INFO] [stderr]     Checking generic_once_cell v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<&T, Void>
[INFO] [stdout]    --> src/lib.rs:283:15
[INFO] [stdout]     |
[INFO] [stdout] 283 |         match self.get_or_try_init(|| Ok::<T, Void>(f())) {
[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 `generic_once_cell` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<&T, Void>
[INFO] [stdout]    --> src/lib.rs:283:15
[INFO] [stdout]     |
[INFO] [stdout] 283 |         match self.get_or_try_init(|| Ok::<T, Void>(f())) {
[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 `generic_once_cell` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "4563dce3ca8c2e9697fbe14c1160b8c2672d5d86658e939ab89e02d1aa741941", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4563dce3ca8c2e9697fbe14c1160b8c2672d5d86658e939ab89e02d1aa741941", kill_on_drop: false }`
[INFO] [stdout] 4563dce3ca8c2e9697fbe14c1160b8c2672d5d86658e939ab89e02d1aa741941