[INFO] fetching crate mcl_rust 1.0.4...
[INFO] checking mcl_rust-1.0.4 against try#dcc22e5232dd0dbe95a4b3ab84c8d24a0880771e for pr-153721
[INFO] extracting crate mcl_rust 1.0.4 into /workspace/builds/worker-3-tc2/source
[INFO] started tweaking crates.io crate mcl_rust 1.0.4
[INFO] removed 0 missing examples
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate mcl_rust 1.0.4
[INFO] tweaked toml for crates.io crate mcl_rust 1.0.4 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate mcl_rust 1.0.4 on toolchain dcc22e5232dd0dbe95a4b3ab84c8d24a0880771e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dcc22e5232dd0dbe95a4b3ab84c8d24a0880771e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate mcl_rust 1.0.4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dcc22e5232dd0dbe95a4b3ab84c8d24a0880771e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3e793bdf10248eb2ddbd6b0faebed8155c11b4589982e2893733958d93e8d540" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 46b7aa56d7d4f9f6871b0645c5cfdd2407c7fd540c9256218a59af1b679888df
[INFO] running `Command { std: "docker" "start" "46b7aa56d7d4f9f6871b0645c5cfdd2407c7fd540c9256218a59af1b679888df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "46b7aa56d7d4f9f6871b0645c5cfdd2407c7fd540c9256218a59af1b679888df" "/opt/rustwide/cargo-home/bin/cargo" "+dcc22e5232dd0dbe95a4b3ab84c8d24a0880771e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "46b7aa56d7d4f9f6871b0645c5cfdd2407c7fd540c9256218a59af1b679888df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "46b7aa56d7d4f9f6871b0645c5cfdd2407c7fd540c9256218a59af1b679888df" "/opt/rustwide/cargo-home/bin/cargo" "+dcc22e5232dd0dbe95a4b3ab84c8d24a0880771e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.2.62
[INFO] [stderr]    Compiling cmake v0.1.58
[INFO] [stderr]    Compiling mcl_rust v1.0.4 (/opt/rustwide/workdir)
[INFO] [stdout] error: target-based cfg should be avoided in build scripts
[INFO] [stdout]   --> build.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 |     if cfg!(target_arch = "x86_64") {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use cargo environment variables if possible: `std::env::var("CARGO_CFG_TARGET_ARCH").unwrap_or_default() == "x86_64"`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(misleading_cfg_in_build_script)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mcl_rust` (build script) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "46b7aa56d7d4f9f6871b0645c5cfdd2407c7fd540c9256218a59af1b679888df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46b7aa56d7d4f9f6871b0645c5cfdd2407c7fd540c9256218a59af1b679888df", kill_on_drop: false }`
[INFO] [stdout] 46b7aa56d7d4f9f6871b0645c5cfdd2407c7fd540c9256218a59af1b679888df