[INFO] fetching crate periodicelements 0.1.2...
[INFO] testing periodicelements-0.1.2 against 1.91.0 for beta-1.92-2
[INFO] extracting crate periodicelements 0.1.2 into /workspace/builds/worker-5-tc1/source
[INFO] started tweaking crates.io crate periodicelements 0.1.2
[INFO] finished tweaking crates.io crate periodicelements 0.1.2
[INFO] tweaked toml for crates.io crate periodicelements 0.1.2 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate periodicelements 0.1.2 on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate periodicelements 0.1.2 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" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rle-decode-fast v1.0.3
[INFO] [stderr]   Downloaded include-flate-codegen v0.1.4
[INFO] [stderr]   Downloaded include-flate-codegen-exports v0.1.4
[INFO] [stderr]   Downloaded libflate_lz77 v1.1.0
[INFO] [stderr]   Downloaded ascii_table v4.0.2
[INFO] [stderr]   Downloaded libflate v1.2.0
[INFO] [stderr]   Downloaded serde_derive v1.0.147
[INFO] [stderr]   Downloaded serde v1.0.147
[INFO] [stderr]   Downloaded serde_json v1.0.88
[INFO] [stderr]   Downloaded include-flate v0.1.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b2550b79cae0355e99ddc4f404db32c3b806cab142692f59bff5988e6d24af15
[INFO] running `Command { std: "docker" "start" "-a" "b2550b79cae0355e99ddc4f404db32c3b806cab142692f59bff5988e6d24af15", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b2550b79cae0355e99ddc4f404db32c3b806cab142692f59bff5988e6d24af15", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2550b79cae0355e99ddc4f404db32c3b806cab142692f59bff5988e6d24af15", kill_on_drop: false }`
[INFO] [stdout] b2550b79cae0355e99ddc4f404db32c3b806cab142692f59bff5988e6d24af15
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 34257ca53b1f81b8f6986e8c1628345add89fef461ace032c6c3c580a0a90eec
[INFO] running `Command { std: "docker" "start" "-a" "34257ca53b1f81b8f6986e8c1628345add89fef461ace032c6c3c580a0a90eec", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.47
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling unicode-ident v1.0.5
[INFO] [stderr]    Compiling syn v1.0.103
[INFO] [stderr]    Compiling rle-decode-fast v1.0.3
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]    Compiling serde_derive v1.0.147
[INFO] [stderr]    Compiling serde v1.0.147
[INFO] [stderr]    Compiling serde_json v1.0.88
[INFO] [stderr]    Compiling itoa v1.0.4
[INFO] [stderr]    Compiling ryu v1.0.11
[INFO] [stderr]    Compiling ascii_table v4.0.2
[INFO] [stderr]    Compiling libflate_lz77 v1.1.0
[INFO] [stderr]    Compiling libflate v1.2.0
[INFO] [stderr]    Compiling include-flate-codegen v0.1.4
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/include-flate-codegen-0.1.4/src/lib.rs:16:38
[INFO] [stdout]    |
[INFO] [stdout] 16 | #![cfg_attr(not(feature = "stable"), feature(proc_macro_span))]
[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 `include-flate-codegen` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "34257ca53b1f81b8f6986e8c1628345add89fef461ace032c6c3c580a0a90eec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "34257ca53b1f81b8f6986e8c1628345add89fef461ace032c6c3c580a0a90eec", kill_on_drop: false }`
[INFO] [stdout] 34257ca53b1f81b8f6986e8c1628345add89fef461ace032c6c3c580a0a90eec