[INFO] fetching crate racer-testutils 0.1.0...
[INFO] testing racer-testutils-0.1.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate racer-testutils 0.1.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate racer-testutils 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 racer-testutils 0.1.0
[INFO] finished tweaking crates.io crate racer-testutils 0.1.0
[INFO] tweaked toml for crates.io crate racer-testutils 0.1.0 written to /workspace/builds/worker-1/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]  Downloading crates ...
[INFO] [stderr]   Downloaded memmap2 v0.2.3
[INFO] [stderr]   Downloaded racer-cargo-metadata v0.1.2
[INFO] [stderr]   Downloaded rustc-ap-rustc_index v722.0.0
[INFO] [stderr]   Downloaded racer-interner v0.1.0
[INFO] [stderr]   Downloaded termize v0.1.1
[INFO] [stderr]   Downloaded annotate-snippets v0.8.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_data_structures v722.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_target v722.0.0
[INFO] [stderr]   Downloaded md-5 v0.9.1
[INFO] [stderr]   Downloaded rustc-rayon-core v0.3.1
[INFO] [stderr]   Downloaded rustc-ap-rustc_fs_util v722.0.0
[INFO] [stderr]   Downloaded rustc-rayon v0.3.1
[INFO] [stderr]   Downloaded rustc-ap-rustc_ast v722.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_errors v722.0.0
[INFO] [stderr]   Downloaded rls-span v0.5.4
[INFO] [stderr]   Downloaded rustc-ap-rustc_parse v722.0.0
[INFO] [stderr]   Downloaded measureme v9.1.2
[INFO] [stderr]   Downloaded racer v2.1.48
[INFO] [stderr]   Downloaded rustc-ap-rustc_ast_pretty v722.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_lexer v722.0.0
[INFO] [stderr]   Downloaded perf-event-open-sys v1.0.1
[INFO] [stderr]   Downloaded rustc-ap-rustc_lint_defs v722.0.0
[INFO] [stderr]   Downloaded stacker v0.1.14
[INFO] [stderr]   Downloaded rustc-ap-rustc_serialize v722.0.0
[INFO] [stderr]   Downloaded psm v0.1.16
[INFO] [stderr]   Downloaded rustc-ap-rustc_session v722.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_graphviz v722.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_macros v722.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_arena v722.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_feature v722.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_span v722.0.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] 152460631b6f43fe3016fea52d89e1cff0e66055662d941fcb48801e027f8f57
[INFO] running `Command { std: "docker" "start" "-a" "152460631b6f43fe3016fea52d89e1cff0e66055662d941fcb48801e027f8f57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "152460631b6f43fe3016fea52d89e1cff0e66055662d941fcb48801e027f8f57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "152460631b6f43fe3016fea52d89e1cff0e66055662d941fcb48801e027f8f57", kill_on_drop: false }`
[INFO] [stdout] 152460631b6f43fe3016fea52d89e1cff0e66055662d941fcb48801e027f8f57
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] 42eb77062f146784b04c49f6aed652375b6fc2904d8db2670bd721350d885c0b
[INFO] running `Command { std: "docker" "start" "-a" "42eb77062f146784b04c49f6aed652375b6fc2904d8db2670bd721350d885c0b", kill_on_drop: false }`
[INFO] [stderr]    Compiling smallvec v1.6.1
[INFO] [stderr]    Compiling rustc-rayon-core v0.3.1
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling rustc-ap-rustc_graphviz v722.0.0
[INFO] [stderr]    Compiling annotate-snippets v0.8.0
[INFO] [stderr]    Compiling rustc-ap-rustc_fs_util v722.0.0
[INFO] [stderr]    Compiling psm v0.1.16
[INFO] [stderr]    Compiling stacker v0.1.14
[INFO] [stderr]    Compiling rustc-ap-rustc_lexer v722.0.0
[INFO] [stderr]    Compiling perf-event-open-sys v1.0.1
[INFO] [stderr]    Compiling memmap2 v0.2.3
[INFO] [stderr]    Compiling ena v0.14.0
[INFO] [stderr]    Compiling termize v0.1.1
[INFO] [stderr]    Compiling synstructure v0.12.5
[INFO] [stderr]    Compiling sha-1 v0.9.8
[INFO] [stderr]    Compiling md-5 v0.9.1
[INFO] [stderr]    Compiling tracing v0.1.26
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling env_logger v0.7.1
[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/rustc-ap-rustc_graphviz-722.0.0/src/lib.rs:278:1
[INFO] [stdout]     |
[INFO] [stdout] 278 | #![feature(nll)]
[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/smallvec-1.6.1/src/lib.rs:76:37
[INFO] [stdout]    |
[INFO] [stdout] 76 | #![cfg_attr(feature = "may_dangle", feature(dropck_eyepatch))]
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rustc-ap-rustc_graphviz` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "42eb77062f146784b04c49f6aed652375b6fc2904d8db2670bd721350d885c0b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "42eb77062f146784b04c49f6aed652375b6fc2904d8db2670bd721350d885c0b", kill_on_drop: false }`
[INFO] [stdout] 42eb77062f146784b04c49f6aed652375b6fc2904d8db2670bd721350d885c0b