[INFO] fetching crate gap_vec 0.1.0...
[INFO] testing gap_vec-0.1.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate gap_vec 0.1.0 into /workspace/builds/worker-112/source
[INFO] validating manifest of crates.io crate gap_vec 0.1.0 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 gap_vec 0.1.0
[INFO] finished tweaking crates.io crate gap_vec 0.1.0
[INFO] tweaked toml for crates.io crate gap_vec 0.1.0 written to /workspace/builds/worker-112/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-112/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-112/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] 18cea3c8c15adb0174d65e8838f1c3c7e1b392d40ddfa02aa8567e9ae878eedf
[INFO] running `Command { std: "docker" "start" "-a" "18cea3c8c15adb0174d65e8838f1c3c7e1b392d40ddfa02aa8567e9ae878eedf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "18cea3c8c15adb0174d65e8838f1c3c7e1b392d40ddfa02aa8567e9ae878eedf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18cea3c8c15adb0174d65e8838f1c3c7e1b392d40ddfa02aa8567e9ae878eedf", kill_on_drop: false }`
[INFO] [stdout] 18cea3c8c15adb0174d65e8838f1c3c7e1b392d40ddfa02aa8567e9ae878eedf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-112/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-112/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] bc342356e82dde0399f0a56c008c0ee1ba8132678c5beef5d62c37b31fa0576e
[INFO] running `Command { std: "docker" "start" "-a" "bc342356e82dde0399f0a56c008c0ee1ba8132678c5beef5d62c37b31fa0576e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling gap_vec 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:44:1
[INFO] [stdout]    |
[INFO] [stdout] 44 | #![feature(core_intrinsics, alloc, raw_vec_internals)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `cap` found for struct `RawVec` in the current scope
[INFO] [stdout]    --> src/lib.rs:147:18
[INFO] [stdout]     |
[INFO] [stdout] 147 |         self.buf.cap()
[INFO] [stdout]     |                  ^^^ private field, not a method
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `cap` found for struct `RawVec` in the current scope
[INFO] [stdout]    --> src/lib.rs:306:49
[INFO] [stdout]     |
[INFO] [stdout] 306 |         let new_gap = self.gap.start .. new_buf.cap() - after_gap;
[INFO] [stdout]     |                                                 ^^^ private field, not a method
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `gap_vec` due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "bc342356e82dde0399f0a56c008c0ee1ba8132678c5beef5d62c37b31fa0576e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bc342356e82dde0399f0a56c008c0ee1ba8132678c5beef5d62c37b31fa0576e", kill_on_drop: false }`
[INFO] [stdout] bc342356e82dde0399f0a56c008c0ee1ba8132678c5beef5d62c37b31fa0576e