[INFO] fetching crate cpclib-tokens 0.4.4...
[INFO] testing cpclib-tokens-0.4.4 against 1.55.0 for beta-1.56-1
[INFO] extracting crate cpclib-tokens 0.4.4 into /workspace/builds/worker-104/source
[INFO] validating manifest of crates.io crate cpclib-tokens 0.4.4 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 cpclib-tokens 0.4.4
[INFO] finished tweaking crates.io crate cpclib-tokens 0.4.4
[INFO] tweaked toml for crates.io crate cpclib-tokens 0.4.4 written to /workspace/builds/worker-104/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-104/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-104/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] 30416385b1358aecc84bffecbd82ddbee7f70fae213d2041256ae110b069cc37
[INFO] running `Command { std: "docker" "start" "-a" "30416385b1358aecc84bffecbd82ddbee7f70fae213d2041256ae110b069cc37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "30416385b1358aecc84bffecbd82ddbee7f70fae213d2041256ae110b069cc37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "30416385b1358aecc84bffecbd82ddbee7f70fae213d2041256ae110b069cc37", kill_on_drop: false }`
[INFO] [stdout] 30416385b1358aecc84bffecbd82ddbee7f70fae213d2041256ae110b069cc37
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-104/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-104/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] e4dd35d1561a2f4c93b2f91cec0228ae29be1a2914911aa6065b00192e1691e4
[INFO] running `Command { std: "docker" "start" "-a" "e4dd35d1561a2f4c93b2f91cec0228ae29be1a2914911aa6065b00192e1691e4", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling tinyvec_macros v0.1.0
[INFO] [stderr]    Compiling matches v0.1.9
[INFO] [stderr]    Compiling unicode-bidi v0.3.6
[INFO] [stderr]    Compiling percent-encoding v2.1.0
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling radium v0.5.3
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling lexical-core v0.7.6
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling arrayvec v0.5.2
[INFO] [stderr]    Compiling funty v1.1.0
[INFO] [stderr]    Compiling tap v1.0.1
[INFO] [stderr]    Compiling wyz v0.2.0
[INFO] [stderr]    Compiling static_assertions v1.1.0
[INFO] [stderr]    Compiling bitflags v1.3.2
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling bitsets v0.1.1
[INFO] [stderr]    Compiling smallvec v1.6.1
[INFO] [stderr]    Compiling strsim v0.10.0
[INFO] [stderr]    Compiling paste v1.0.5
[INFO] [stderr]    Compiling nom v6.2.1
[INFO] [stderr]    Compiling time v0.1.44
[INFO] [stderr]    Compiling tinyvec v1.3.1
[INFO] [stderr]    Compiling itertools v0.9.0
[INFO] [stderr]    Compiling form_urlencoded v1.0.1
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling unicode-normalization v0.1.19
[INFO] [stderr]    Compiling bitvec v0.19.5
[INFO] [stderr]    Compiling idna v0.2.3
[INFO] [stderr]    Compiling thiserror-impl v1.0.29
[INFO] [stderr]    Compiling derivative v2.2.0
[INFO] [stderr]    Compiling delegate v0.5.2
[INFO] [stderr]    Compiling remain v0.2.2
[INFO] [stderr]    Compiling url v2.2.2
[INFO] [stderr]    Compiling thiserror v1.0.29
[INFO] [stderr]    Compiling toml v0.5.8
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling cargo-lock v4.0.1
[INFO] [stderr]    Compiling proc-macro-crate v1.0.0
[INFO] [stderr]    Compiling num_enum_derive v0.5.4
[INFO] [stderr]    Compiling built v0.4.4
[INFO] [stderr]    Compiling cpclib-sna v0.4.4
[INFO] [stderr]    Compiling cpclib-tokens v0.4.4 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling num_enum v0.5.4
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(stmt_expr_attributes)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(proc_macro_hygiene)]
[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 `cpclib-tokens` due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "e4dd35d1561a2f4c93b2f91cec0228ae29be1a2914911aa6065b00192e1691e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e4dd35d1561a2f4c93b2f91cec0228ae29be1a2914911aa6065b00192e1691e4", kill_on_drop: false }`
[INFO] [stdout] e4dd35d1561a2f4c93b2f91cec0228ae29be1a2914911aa6065b00192e1691e4