[INFO] crate rustfmt-nightly 1.4.14 is already in cache
[INFO] checking rustfmt-nightly-1.4.14 against master#6d69caba110c0c2fb90180df1cbc8be5033b91d4 for pr-69530
[INFO] extracting crate rustfmt-nightly 1.4.14 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate rustfmt-nightly 1.4.14 on toolchain 6d69caba110c0c2fb90180df1cbc8be5033b91d4
[INFO] running `"/workspace/cargo-home/bin/cargo" "+6d69caba110c0c2fb90180df1cbc8be5033b91d4" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate rustfmt-nightly 1.4.14
[INFO] finished tweaking crates.io crate rustfmt-nightly 1.4.14
[INFO] tweaked toml for crates.io crate rustfmt-nightly 1.4.14 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate rustfmt-nightly 1.4.14 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+6d69caba110c0c2fb90180df1cbc8be5033b91d4" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+6d69caba110c0c2fb90180df1cbc8be5033b91d4" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2b256dd4c07018adc66b65049c49a8d504089236634b3c693a7cfbaed24e8c60
[INFO] running `"docker" "start" "-a" "2b256dd4c07018adc66b65049c49a8d504089236634b3c693a7cfbaed24e8c60"`
[INFO] [stderr]     Checking smallvec v1.2.0
[INFO] [stderr]    Compiling rustc-rayon-core v0.3.0
[INFO] [stderr]     Checking rustc-ap-graphviz v654.0.0
[INFO] [stderr]    Compiling rustc-ap-rustc_ast v654.0.0
[INFO] [stderr]    Compiling rustc-ap-rustc_target v654.0.0
[INFO] [stderr]     Checking rustc-ap-rustc_fs_util v654.0.0
[INFO] [stderr]    Compiling rustfmt-nightly v1.4.14 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking diff v0.1.11
[INFO] [stderr]     Checking unicode_categories v0.1.1
[INFO] [stderr]     Checking bytecount v0.6.0
[INFO] [stderr]     Checking rustc-workspace-hack v1.0.0
[INFO] [stderr]     Checking crossbeam-utils v0.6.5
[INFO] [stderr]    Compiling crossbeam-utils v0.7.0
[INFO] [stderr]     Checking lock_api v0.3.1
[INFO] [stderr]     Checking itertools v0.8.0
[INFO] [stderr]     Checking annotate-snippets v0.6.1
[INFO] [stderr]     Checking rustc-ap-rustc_lexer v654.0.0
[INFO] [stderr]     Checking unicode-normalization v0.1.12
[INFO] [stderr]     Checking num_cpus v1.10.1
[INFO] [stderr]     Checking parking_lot_core v0.7.0
[INFO] [stderr]     Checking termize v0.1.1
[INFO] [stderr]     Checking ena v0.13.1
[INFO] [stderr]     Checking jobserver v0.1.17
[INFO] [stderr]     Checking backtrace-sys v0.1.32
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking crossbeam-queue v0.1.2
[INFO] [stderr]     Checking rustc-ap-serialize v654.0.0
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking backtrace v0.3.40
[INFO] [stderr]     Checking parking_lot v0.10.0
[INFO] [stderr]     Checking md-5 v0.8.0
[INFO] [stderr]     Checking sha-1 v0.8.2
[INFO] [stderr]     Checking globset v0.4.4
[INFO] [stderr]     Checking env_logger v0.6.2
[INFO] [stderr]     Checking crossbeam-channel v0.4.0
[INFO] [stderr] error[E0658]: use of unstable library feature 'assoc_int_consts': recently added
[INFO] [stderr]     --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rustc-ap-serialize-654.0.0/json.rs:2348:30
[INFO] [stderr]      |
[INFO] [stderr] 2348 |             Json::Null => Ok(f64::NAN),
[INFO] [stderr]      |                              ^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: see issue #68490 <https://github.com/rust-lang/rust/issues/68490> for more information
[INFO] [stderr]      = help: add `#![feature(assoc_int_consts)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0658`.
[INFO] [stderr] error: could not compile `rustc-ap-serialize`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "2b256dd4c07018adc66b65049c49a8d504089236634b3c693a7cfbaed24e8c60"`
[INFO] running `"docker" "rm" "-f" "2b256dd4c07018adc66b65049c49a8d504089236634b3c693a7cfbaed24e8c60"`
[INFO] [stdout] 2b256dd4c07018adc66b65049c49a8d504089236634b3c693a7cfbaed24e8c60