[INFO] crate cfg 0.4.0 is already in cache
[INFO] checking cfg-0.4.0 against master#30ca215b4e38b32aa7abdd635c5e2d56f5724494 for pr-66037
[INFO] extracting crate cfg 0.4.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate cfg 0.4.0 on toolchain 30ca215b4e38b32aa7abdd635c5e2d56f5724494
[INFO] running `"/workspace/cargo-home/bin/cargo" "+30ca215b4e38b32aa7abdd635c5e2d56f5724494" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate cfg 0.4.0
[INFO] finished tweaking crates.io crate cfg 0.4.0
[INFO] tweaked toml for crates.io crate cfg 0.4.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+30ca215b4e38b32aa7abdd635c5e2d56f5724494" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/workspace/cargo-home/bin/cargo" "+30ca215b4e38b32aa7abdd635c5e2d56f5724494" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+30ca215b4e38b32aa7abdd635c5e2d56f5724494" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 0255777b0472b900fb4cffe7d5e795ea59793e9038a7b00365b45d12d319ec83
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "0255777b0472b900fb4cffe7d5e795ea59793e9038a7b00365b45d12d319ec83"`
[INFO] [stderr]     Checking bit-vec v0.6.1
[INFO] [stderr]     Checking optional v0.5.0
[INFO] [stderr]     Checking bit-matrix v0.4.0
[INFO] [stderr]     Checking cfg v0.4.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]   --> src/symbol/source.rs:48:34
[INFO] [stderr]    |
[INFO] [stderr] 48 |           impl SymbolContainer for ( Symbol $(, $T)* ) {
[INFO] [stderr]    |                                    ^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 60 | / impl_generate!(
[INFO] [stderr] 61 | |     Symbol, next_sym, Symbol, next_sym, Symbol, next_sym, Symbol, next_sym,
[INFO] [stderr] 62 | |     Symbol, next_sym, Symbol, next_sym, Symbol, next_sym, Symbol, next_sym,
[INFO] [stderr] 63 | |     Symbol, next_sym, Symbol, next_sym, Symbol, next_sym, Symbol, next_sym,
[INFO] [stderr] ...  |
[INFO] [stderr] 68 | |     Symbol, next_sym, Symbol, next_sym, Symbol, next_sym, Symbol, next_sym,
[INFO] [stderr] 69 | | );
[INFO] [stderr]    | |__- in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: unnecessary parentheses around type
[INFO] [stderr]   --> src/symbol/source.rs:48:34
[INFO] [stderr]    |
[INFO] [stderr] 48 |           impl SymbolContainer for ( Symbol $(, $T)* ) {
[INFO] [stderr]    |                                    ^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 60 | / impl_generate!(
[INFO] [stderr] 61 | |     Symbol, next_sym, Symbol, next_sym, Symbol, next_sym, Symbol, next_sym,
[INFO] [stderr] 62 | |     Symbol, next_sym, Symbol, next_sym, Symbol, next_sym, Symbol, next_sym,
[INFO] [stderr] 63 | |     Symbol, next_sym, Symbol, next_sym, Symbol, next_sym, Symbol, next_sym,
[INFO] [stderr] ...  |
[INFO] [stderr] 68 | |     Symbol, next_sym, Symbol, next_sym, Symbol, next_sym, Symbol, next_sym,
[INFO] [stderr] 69 | | );
[INFO] [stderr]    | |__- in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr] note: lint level defined here
[INFO] [stderr]   --> src/lib.rs:11:24
[INFO] [stderr]    |
[INFO] [stderr] 11 | #![cfg_attr(test, deny(warnings))]
[INFO] [stderr]    |                        ^^^^^^^^
[INFO] [stderr]    = note: `#[deny(unused_parens)]` implied by `#[deny(warnings)]`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `cfg`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "0255777b0472b900fb4cffe7d5e795ea59793e9038a7b00365b45d12d319ec83"`
[INFO] running `"docker" "rm" "-f" "0255777b0472b900fb4cffe7d5e795ea59793e9038a7b00365b45d12d319ec83"`
[INFO] [stdout] 0255777b0472b900fb4cffe7d5e795ea59793e9038a7b00365b45d12d319ec83