[INFO] fetching crate rsfk 0.1.0...
[INFO] testing rsfk-0.1.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate rsfk 0.1.0 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate rsfk 0.1.0
[INFO] finished tweaking crates.io crate rsfk 0.1.0
[INFO] tweaked toml for crates.io crate rsfk 0.1.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate rsfk 0.1.0 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate rsfk 0.1.0 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" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded autocfg v1.2.0
[INFO] [stderr]   Downloaded num-iter v0.1.44
[INFO] [stderr]   Downloaded num v0.4.1
[INFO] [stderr]   Downloaded input-macro v0.2.0
[INFO] [stderr]   Downloaded rsfk-core v0.1.0
[INFO] [stderr]   Downloaded num-complex v0.4.5
[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" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7f9d480500206cbd3a00a748c9daca307d0f9c0a839f38c00715ff186aa258ab
[INFO] running `Command { std: "docker" "start" "-a" "7f9d480500206cbd3a00a748c9daca307d0f9c0a839f38c00715ff186aa258ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7f9d480500206cbd3a00a748c9daca307d0f9c0a839f38c00715ff186aa258ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7f9d480500206cbd3a00a748c9daca307d0f9c0a839f38c00715ff186aa258ab", kill_on_drop: false }`
[INFO] [stdout] 7f9d480500206cbd3a00a748c9daca307d0f9c0a839f38c00715ff186aa258ab
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b65e82069c22607cf6c1a5e60733927cd17e2ec72e71352dcea9120cbc8c07b5
[INFO] running `Command { std: "docker" "start" "-a" "b65e82069c22607cf6c1a5e60733927cd17e2ec72e71352dcea9120cbc8c07b5", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.2.0
[INFO] [stderr]    Compiling input-macro v0.2.0
[INFO] [stderr]    Compiling num-traits v0.2.18
[INFO] [stderr]    Compiling num-bigint v0.4.4
[INFO] [stderr]    Compiling num-rational v0.4.1
[INFO] [stderr]    Compiling num-integer v0.1.46
[INFO] [stderr]    Compiling num-complex v0.4.5
[INFO] [stderr]    Compiling num-iter v0.1.44
[INFO] [stderr]    Compiling num v0.4.1
[INFO] [stderr]    Compiling rsfk-core v0.1.0
[INFO] [stderr]    Compiling rsfk v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(iter_map_windows)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(proc_macro_quote)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rsfk` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "b65e82069c22607cf6c1a5e60733927cd17e2ec72e71352dcea9120cbc8c07b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b65e82069c22607cf6c1a5e60733927cd17e2ec72e71352dcea9120cbc8c07b5", kill_on_drop: false }`
[INFO] [stdout] b65e82069c22607cf6c1a5e60733927cd17e2ec72e71352dcea9120cbc8c07b5