[INFO] fetching crate ft2 0.2.1...
[INFO] testing ft2-0.2.1 against 1.55.0 for beta-1.56-1
[INFO] extracting crate ft2 0.2.1 into /workspace/builds/worker-29/source
[INFO] validating manifest of crates.io crate ft2 0.2.1 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ft2 0.2.1
[INFO] finished tweaking crates.io crate ft2 0.2.1
[INFO] tweaked toml for crates.io crate ft2 0.2.1 written to /workspace/builds/worker-29/source/Cargo.toml
[INFO] crate crates.io crate ft2 0.2.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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 fallible v0.1.3
[INFO] [stderr]   Downloaded flags v0.1.5
[INFO] [stderr]   Downloaded null-terminated v0.3.15
[INFO] [stderr]   Downloaded freetype-sys v0.7.1
[INFO] [stderr]   Downloaded utf v0.1.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6e9f6cb7184f538d776f2d3d31bb7ddeb9c53b5c041e8e3225637d8ebf899313
[INFO] running `Command { std: "docker" "start" "-a" "6e9f6cb7184f538d776f2d3d31bb7ddeb9c53b5c041e8e3225637d8ebf899313", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6e9f6cb7184f538d776f2d3d31bb7ddeb9c53b5c041e8e3225637d8ebf899313", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6e9f6cb7184f538d776f2d3d31bb7ddeb9c53b5c041e8e3225637d8ebf899313", kill_on_drop: false }`
[INFO] [stdout] 6e9f6cb7184f538d776f2d3d31bb7ddeb9c53b5c041e8e3225637d8ebf899313
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 64a1d45e92a02e13a0b33a6259a30480843544ef0c5bd658e769fc291ab4eb42
[INFO] running `Command { std: "docker" "start" "-a" "64a1d45e92a02e13a0b33a6259a30480843544ef0c5bd658e769fc291ab4eb42", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.0.68
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling utf v0.1.6
[INFO] [stderr]    Compiling flags v0.1.5
[INFO] [stderr]    Compiling freetype-sys v0.7.1
[INFO] [stderr]    Compiling unreachable v1.0.0
[INFO] [stderr]    Compiling fallible v0.1.3
[INFO] [stderr]    Compiling null-terminated v0.3.15
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/null-terminated-0.3.15/src/lib.rs:25:1
[INFO] [stdout]    |
[INFO] [stdout] 25 | #![feature(const_raw_ptr_deref)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/null-terminated-0.3.15/src/lib.rs:26:1
[INFO] [stdout]    |
[INFO] [stdout] 26 | #![feature(extern_types)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `null-terminated` due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "64a1d45e92a02e13a0b33a6259a30480843544ef0c5bd658e769fc291ab4eb42", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "64a1d45e92a02e13a0b33a6259a30480843544ef0c5bd658e769fc291ab4eb42", kill_on_drop: false }`
[INFO] [stdout] 64a1d45e92a02e13a0b33a6259a30480843544ef0c5bd658e769fc291ab4eb42