[INFO] fetching crate meow_forth 0.1.0...
[INFO] testing meow_forth-0.1.0 against try#8262275854dc0e5381c9d42d56257d94932c5a87 for pr-90799
[INFO] extracting crate meow_forth 0.1.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate meow_forth 0.1.0 on toolchain 8262275854dc0e5381c9d42d56257d94932c5a87
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate meow_forth 0.1.0
[INFO] finished tweaking crates.io crate meow_forth 0.1.0
[INFO] tweaked toml for crates.io crate meow_forth 0.1.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 65c5669be8b8e94469e73cbcfb81ee9fe78336cf753fc00de5c7aba0c2dcfebb
[INFO] running `Command { std: "docker" "start" "-a" "65c5669be8b8e94469e73cbcfb81ee9fe78336cf753fc00de5c7aba0c2dcfebb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "65c5669be8b8e94469e73cbcfb81ee9fe78336cf753fc00de5c7aba0c2dcfebb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "65c5669be8b8e94469e73cbcfb81ee9fe78336cf753fc00de5c7aba0c2dcfebb", kill_on_drop: false }`
[INFO] [stdout] 65c5669be8b8e94469e73cbcfb81ee9fe78336cf753fc00de5c7aba0c2dcfebb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2c8b4b29f52328f4f2162801e358d3c943a97200a7bc8b5b3fd589e0b0156bd9
[INFO] running `Command { std: "docker" "start" "-a" "2c8b4b29f52328f4f2162801e358d3c943a97200a7bc8b5b3fd589e0b0156bd9", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling meow_forth v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::prelude::v1 as alloc_prelude`
[INFO] [stdout]  --> src/lib.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::prelude::v1 as alloc_prelude;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `alloc_prelude`
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(alloc_prelude)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `meow_forth` due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "2c8b4b29f52328f4f2162801e358d3c943a97200a7bc8b5b3fd589e0b0156bd9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c8b4b29f52328f4f2162801e358d3c943a97200a7bc8b5b3fd589e0b0156bd9", kill_on_drop: false }`
[INFO] [stdout] 2c8b4b29f52328f4f2162801e358d3c943a97200a7bc8b5b3fd589e0b0156bd9