[INFO] fetching crate possibly_uninit 0.1.0-preview...
[INFO] checking possibly_uninit-0.1.0-preview against master#7f5a42b073dc2bee2aa625052eb066ee07072048 for pr-78991
[INFO] extracting crate possibly_uninit 0.1.0-preview into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate possibly_uninit 0.1.0-preview on toolchain 7f5a42b073dc2bee2aa625052eb066ee07072048
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate possibly_uninit 0.1.0-preview
[INFO] finished tweaking crates.io crate possibly_uninit 0.1.0-preview
[INFO] tweaked toml for crates.io crate possibly_uninit 0.1.0-preview written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] a11685a9534f22f39c58c1766b4d760a6e3d26c8e3f1f976f09dfb4f83df82e2
[INFO] running `Command { std: "docker" "start" "-a" "a11685a9534f22f39c58c1766b4d760a6e3d26c8e3f1f976f09dfb4f83df82e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a11685a9534f22f39c58c1766b4d760a6e3d26c8e3f1f976f09dfb4f83df82e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a11685a9534f22f39c58c1766b4d760a6e3d26c8e3f1f976f09dfb4f83df82e2", kill_on_drop: false }`
[INFO] [stdout] a11685a9534f22f39c58c1766b4d760a6e3d26c8e3f1f976f09dfb4f83df82e2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f95c5746a989f0094718040c879061b46ff8e378b0c548470369c6328596eca7
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "f95c5746a989f0094718040c879061b46ff8e378b0c548470369c6328596eca7", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking possibly_uninit v0.1.0-preview (/opt/rustwide/workdir)
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]    --> src/lib.rs:126:20
[INFO] [stdout]     |
[INFO] [stdout] 126 |             self.0.assume_init_mut()
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unstable_name_collisions)]` on by default
[INFO] [stdout]     = warning: once this method is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]     = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]     = help: call with fully qualified syntax `BorrowUninitMut::assume_init_mut(...)` to keep using the current method
[INFO] [stdout]     = help: add `#![feature(maybe_uninit_ref)]` to the crate attributes to enable `MaybeUninit::<T>::assume_init_mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]    --> src/lib.rs:138:20
[INFO] [stdout]     |
[INFO] [stdout] 138 |             self.0.assume_init_mut()
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: once this method is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]     = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]     = help: call with fully qualified syntax `BorrowUninitMut::assume_init_mut(...)` to keep using the current method
[INFO] [stdout]     = help: add `#![feature(maybe_uninit_ref)]` to the crate attributes to enable `MaybeUninit::<T>::assume_init_mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]    --> src/lib.rs:126:20
[INFO] [stdout]     |
[INFO] [stdout] 126 |             self.0.assume_init_mut()
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unstable_name_collisions)]` on by default
[INFO] [stdout]     = warning: once this method is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]     = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]     = help: call with fully qualified syntax `BorrowUninitMut::assume_init_mut(...)` to keep using the current method
[INFO] [stdout]     = help: add `#![feature(maybe_uninit_ref)]` to the crate attributes to enable `MaybeUninit::<T>::assume_init_mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]    --> src/lib.rs:138:20
[INFO] [stdout]     |
[INFO] [stdout] 138 |             self.0.assume_init_mut()
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: once this method is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]     = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]     = help: call with fully qualified syntax `BorrowUninitMut::assume_init_mut(...)` to keep using the current method
[INFO] [stdout]     = help: add `#![feature(maybe_uninit_ref)]` to the crate attributes to enable `MaybeUninit::<T>::assume_init_mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.51s
[INFO] running `Command { std: "docker" "inspect" "f95c5746a989f0094718040c879061b46ff8e378b0c548470369c6328596eca7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f95c5746a989f0094718040c879061b46ff8e378b0c548470369c6328596eca7", kill_on_drop: false }`
[INFO] [stdout] f95c5746a989f0094718040c879061b46ff8e378b0c548470369c6328596eca7