[INFO] fetching crate b3-rs 0.1.0...
[INFO] testing b3-rs-0.1.0 against try#8262275854dc0e5381c9d42d56257d94932c5a87 for pr-90799
[INFO] extracting crate b3-rs 0.1.0 into /workspace/builds/worker-73/source
[INFO] validating manifest of crates.io crate b3-rs 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 b3-rs 0.1.0
[INFO] finished tweaking crates.io crate b3-rs 0.1.0
[INFO] tweaked toml for crates.io crate b3-rs 0.1.0 written to /workspace/builds/worker-73/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded byteio v0.2.3
[INFO] [stderr]   Downloaded nano-leb128 v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 07e4692d06a2e8fc69b7b53b908a30b181ae0f198051d00080a7b26d7c5a4b42
[INFO] running `Command { std: "docker" "start" "-a" "07e4692d06a2e8fc69b7b53b908a30b181ae0f198051d00080a7b26d7c5a4b42", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "07e4692d06a2e8fc69b7b53b908a30b181ae0f198051d00080a7b26d7c5a4b42", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "07e4692d06a2e8fc69b7b53b908a30b181ae0f198051d00080a7b26d7c5a4b42", kill_on_drop: false }`
[INFO] [stdout] 07e4692d06a2e8fc69b7b53b908a30b181ae0f198051d00080a7b26d7c5a4b42
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 27e8f560f3ef8b4c128a536b018743e544ec244b441d68d37921f19b30495751
[INFO] running `Command { std: "docker" "start" "-a" "27e8f560f3ef8b4c128a536b018743e544ec244b441d68d37921f19b30495751", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling byteio v0.2.3
[INFO] [stderr]    Compiling nano-leb128 v0.1.0
[INFO] [stderr]    Compiling b3-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0635]: unknown feature `alloc_prelude`
[INFO] [stdout]   --> src/lib.rs:51:12
[INFO] [stdout]    |
[INFO] [stdout] 51 | #![feature(alloc_prelude)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `b3-rs` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "27e8f560f3ef8b4c128a536b018743e544ec244b441d68d37921f19b30495751", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "27e8f560f3ef8b4c128a536b018743e544ec244b441d68d37921f19b30495751", kill_on_drop: false }`
[INFO] [stdout] 27e8f560f3ef8b4c128a536b018743e544ec244b441d68d37921f19b30495751