[INFO] fetching crate front-vec 0.0.8...
[INFO] testing front-vec-0.0.8 against master#350d0ef0ec0493e6d21cfb265cb8211a0e74d766 for pr-145330-1
[INFO] extracting crate front-vec 0.0.8 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate front-vec 0.0.8
[INFO] finished tweaking crates.io crate front-vec 0.0.8
[INFO] tweaked toml for crates.io crate front-vec 0.0.8 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate front-vec 0.0.8 on toolchain 350d0ef0ec0493e6d21cfb265cb8211a0e74d766
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "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" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 10 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded assert2-macros v0.3.16
[INFO] [stderr]   Downloaded assert2 v0.3.16
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a82e4fafb50091b1f25b5e2f58f27c26ad1a7f9d780fef78cf258c33603eb862
[INFO] running `Command { std: "docker" "start" "-a" "a82e4fafb50091b1f25b5e2f58f27c26ad1a7f9d780fef78cf258c33603eb862", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a82e4fafb50091b1f25b5e2f58f27c26ad1a7f9d780fef78cf258c33603eb862", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a82e4fafb50091b1f25b5e2f58f27c26ad1a7f9d780fef78cf258c33603eb862", kill_on_drop: false }`
[INFO] [stdout] a82e4fafb50091b1f25b5e2f58f27c26ad1a7f9d780fef78cf258c33603eb862
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f364b9909453593fd8cc99b93a8385b4e2cdee1316d2b28e3b0eff42ed607e0e
[INFO] running `Command { std: "docker" "start" "-a" "f364b9909453593fd8cc99b93a8385b4e2cdee1316d2b28e3b0eff42ed607e0e", kill_on_drop: false }`
[INFO] [stderr]    Compiling front-vec v0.0.8 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the feature `ptr_internals` is internal to the compiler or standard library
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(ptr_internals, maybe_uninit_slice)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: using it is strongly discouraged
[INFO] [stdout]   = note: `#[warn(internal_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no function or associated item named `slice_assume_init_ref` found for union `MaybeUninit<T>` in the current scope
[INFO] [stdout]    --> src/front_vec/front_vec.rs:305:31
[INFO] [stdout]     |
[INFO] [stdout] 305 |         unsafe { MaybeUninit::slice_assume_init_ref(slice) }
[INFO] [stdout]     |                               ^^^^^^^^^^^^^^^^^^^^^ function or associated item not found in `MaybeUninit<_>`
[INFO] [stdout]     |
[INFO] [stdout] note: if you're trying to build a new `MaybeUninit<_>` consider using one of the following associated functions:
[INFO] [stdout]       MaybeUninit::<T>::new
[INFO] [stdout]       MaybeUninit::<T>::uninit
[INFO] [stdout]       MaybeUninit::<T>::zeroed
[INFO] [stdout]    --> /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/core/src/mem/maybe_uninit.rs:307:5
[INFO] [stdout] help: there is a method `assume_init_ref` with a similar name, but with different arguments
[INFO] [stdout]    --> /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/core/src/mem/maybe_uninit.rs:782:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `front-vec` (lib) due to 1 previous error; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "f364b9909453593fd8cc99b93a8385b4e2cdee1316d2b28e3b0eff42ed607e0e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f364b9909453593fd8cc99b93a8385b4e2cdee1316d2b28e3b0eff42ed607e0e", kill_on_drop: false }`
[INFO] [stdout] f364b9909453593fd8cc99b93a8385b4e2cdee1316d2b28e3b0eff42ed607e0e