[INFO] fetching crate ffi-string 1.0.4...
[INFO] testing ffi-string-1.0.4 against 1.90.0 for beta-1.91-3
[INFO] extracting crate ffi-string 1.0.4 into /workspace/builds/worker-3-tc1/source
[INFO] started tweaking crates.io crate ffi-string 1.0.4
[INFO] finished tweaking crates.io crate ffi-string 1.0.4
[INFO] tweaked toml for crates.io crate ffi-string 1.0.4 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate ffi-string 1.0.4 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 ffi-string 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" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] ac3b28f7998a85eb8d862262ccc1d2b9570be7e247a3c8c9d4e43e18af507d96
[INFO] running `Command { std: "docker" "start" "-a" "ac3b28f7998a85eb8d862262ccc1d2b9570be7e247a3c8c9d4e43e18af507d96", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ac3b28f7998a85eb8d862262ccc1d2b9570be7e247a3c8c9d4e43e18af507d96", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac3b28f7998a85eb8d862262ccc1d2b9570be7e247a3c8c9d4e43e18af507d96", kill_on_drop: false }`
[INFO] [stdout] ac3b28f7998a85eb8d862262ccc1d2b9570be7e247a3c8c9d4e43e18af507d96
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 82e7ca0a8771857da80829f2ded02dc9efb981f0e00383155f2ecc8a8c446c1c
[INFO] running `Command { std: "docker" "start" "-a" "82e7ca0a8771857da80829f2ded02dc9efb981f0e00383155f2ecc8a8c446c1c", kill_on_drop: false }`
[INFO] [stderr]    Compiling ffi-string v1.0.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![feature(str_from_raw_parts)]
[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 `ffi-string` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "82e7ca0a8771857da80829f2ded02dc9efb981f0e00383155f2ecc8a8c446c1c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "82e7ca0a8771857da80829f2ded02dc9efb981f0e00383155f2ecc8a8c446c1c", kill_on_drop: false }`
[INFO] [stdout] 82e7ca0a8771857da80829f2ded02dc9efb981f0e00383155f2ecc8a8c446c1c