[INFO] fetching crate cfg 0.5.0...
[INFO] checking cfg-0.5.0 against master#2ad5292aea6328113b55968b4322528d48261316 for pr-80243
[INFO] extracting crate cfg 0.5.0 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate cfg 0.5.0 on toolchain 2ad5292aea6328113b55968b4322528d48261316
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+2ad5292aea6328113b55968b4322528d48261316" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate cfg 0.5.0
[INFO] finished tweaking crates.io crate cfg 0.5.0
[INFO] tweaked toml for crates.io crate cfg 0.5.0 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+2ad5292aea6328113b55968b4322528d48261316" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+2ad5292aea6328113b55968b4322528d48261316" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+2ad5292aea6328113b55968b4322528d48261316" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4df03e6c55cfcc506c5d41f9c98701504e64e0a98b10d2a46d51b3cd266b993e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4df03e6c55cfcc506c5d41f9c98701504e64e0a98b10d2a46d51b3cd266b993e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4df03e6c55cfcc506c5d41f9c98701504e64e0a98b10d2a46d51b3cd266b993e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4df03e6c55cfcc506c5d41f9c98701504e64e0a98b10d2a46d51b3cd266b993e", kill_on_drop: false }`
[INFO] [stdout] 4df03e6c55cfcc506c5d41f9c98701504e64e0a98b10d2a46d51b3cd266b993e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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=forbid" "-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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+2ad5292aea6328113b55968b4322528d48261316" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 88a7d3657aa90773b2c961491146611a2d79ab74a9b81a93b6ad7b99f36f6942
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "88a7d3657aa90773b2c961491146611a2d79ab74a9b81a93b6ad7b99f36f6942", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.55
[INFO] [stderr]    Compiling serde v1.0.118
[INFO] [stderr]     Checking bit-vec v0.6.3
[INFO] [stderr]     Checking optional v0.5.0
[INFO] [stderr]     Checking bit-matrix v0.6.0
[INFO] [stderr]    Compiling serde_derive v1.0.118
[INFO] [stderr]     Checking cfg v0.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/symbol/source.rs:48:34
[INFO] [stdout]     |
[INFO] [stdout] 48  |           impl SymbolContainer for ( Symbol $(, $T)* ) {
[INFO] [stdout]     |                                    ^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] ...
[INFO] [stdout] 60  | / impl_generate!(
[INFO] [stdout] 61  | |     Symbol, next_sym, Symbol, next_sym, Symbol, next_sym, Symbol, next_sym,
[INFO] [stdout] 62  | |     Symbol, next_sym, Symbol, next_sym, Symbol, next_sym, Symbol, next_sym,
[INFO] [stdout] 63  | |     Symbol, next_sym, Symbol, next_sym, Symbol, next_sym, Symbol, next_sym,
[INFO] [stdout] ...   |
[INFO] [stdout] 106 | |     Symbol, next_sym, Symbol, next_sym, Symbol, next_sym, Symbol, next_sym,
[INFO] [stdout] 107 | | );
[INFO] [stdout]     | |__- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: unnecessary parentheses around type
[INFO] [stdout]    --> src/symbol/source.rs:48:34
[INFO] [stdout]     |
[INFO] [stdout] 48  |           impl SymbolContainer for ( Symbol $(, $T)* ) {
[INFO] [stdout]     |                                    ^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] ...
[INFO] [stdout] 60  | / impl_generate!(
[INFO] [stdout] 61  | |     Symbol, next_sym, Symbol, next_sym, Symbol, next_sym, Symbol, next_sym,
[INFO] [stdout] 62  | |     Symbol, next_sym, Symbol, next_sym, Symbol, next_sym, Symbol, next_sym,
[INFO] [stdout] 63  | |     Symbol, next_sym, Symbol, next_sym, Symbol, next_sym, Symbol, next_sym,
[INFO] [stdout] ...   |
[INFO] [stdout] 106 | |     Symbol, next_sym, Symbol, next_sym, Symbol, next_sym, Symbol, next_sym,
[INFO] [stdout] 107 | | );
[INFO] [stdout]     | |__- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]    --> src/lib.rs:13:24
[INFO] [stdout]     |
[INFO] [stdout] 13  | #![cfg_attr(test, deny(warnings))]
[INFO] [stdout]     |                        ^^^^^^^^
[INFO] [stdout]     = note: `#[deny(unused_parens)]` implied by `#[deny(warnings)]`
[INFO] [stdout]     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cfg`
[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] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/remap.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |         mem::replace(self.grammar.sym_source_mut(), intern.source);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "88a7d3657aa90773b2c961491146611a2d79ab74a9b81a93b6ad7b99f36f6942", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88a7d3657aa90773b2c961491146611a2d79ab74a9b81a93b6ad7b99f36f6942", kill_on_drop: false }`
[INFO] [stdout] 88a7d3657aa90773b2c961491146611a2d79ab74a9b81a93b6ad7b99f36f6942