[INFO] crate const_fn 0.3.0 is already in cache
[INFO] checking const_fn-0.3.0 against master#30ca215b4e38b32aa7abdd635c5e2d56f5724494 for pr-66037
[INFO] extracting crate const_fn 0.3.0 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate const_fn 0.3.0 on toolchain 30ca215b4e38b32aa7abdd635c5e2d56f5724494
[INFO] running `"/workspace/cargo-home/bin/cargo" "+30ca215b4e38b32aa7abdd635c5e2d56f5724494" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate const_fn 0.3.0
[INFO] finished tweaking crates.io crate const_fn 0.3.0
[INFO] tweaked toml for crates.io crate const_fn 0.3.0 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+30ca215b4e38b32aa7abdd635c5e2d56f5724494" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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-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" "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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 0a36ac50415c96cd2b6239f81ca74b91f1e4b337f4a7fc92f52dbf72ee9e5442
[INFO] running `"docker" "start" "-a" "0a36ac50415c96cd2b6239f81ca74b91f1e4b337f4a7fc92f52dbf72ee9e5442"`
[INFO] [stderr]     Checking syn v1.0.13
[INFO] [stderr]     Checking syn-mid v0.4.0
[INFO] [stderr]     Checking const_fn v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused extern crate
[INFO] [stderr]   --> src/lib.rs:71:1
[INFO] [stderr]    |
[INFO] [stderr] 71 | extern crate proc_macro;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^ help: remove it
[INFO] [stderr]    |
[INFO] [stderr] note: lint level defined here
[INFO] [stderr]   --> src/lib.rs:68:9
[INFO] [stderr]    |
[INFO] [stderr] 68 | #![warn(rust_2018_idioms, single_use_lifetimes, unreachable_pub)]
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^
[INFO] [stderr]    = note: `#[warn(unused_extern_crates)]` implied by `#[warn(rust_2018_idioms)]`
[INFO] [stderr] 
[INFO] [stderr] warning: unused extern crate
[INFO] [stderr]   --> src/lib.rs:71:1
[INFO] [stderr]    |
[INFO] [stderr] 71 | extern crate proc_macro;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^ help: remove it
[INFO] [stderr]    |
[INFO] [stderr] note: lint level defined here
[INFO] [stderr]   --> src/lib.rs:68:9
[INFO] [stderr]    |
[INFO] [stderr] 68 | #![warn(rust_2018_idioms, single_use_lifetimes, unreachable_pub)]
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^
[INFO] [stderr]    = note: `#[warn(unused_extern_crates)]` implied by `#[warn(rust_2018_idioms)]`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.94s
[INFO] running `"docker" "inspect" "0a36ac50415c96cd2b6239f81ca74b91f1e4b337f4a7fc92f52dbf72ee9e5442"`
[INFO] running `"docker" "rm" "-f" "0a36ac50415c96cd2b6239f81ca74b91f1e4b337f4a7fc92f52dbf72ee9e5442"`
[INFO] [stdout] 0a36ac50415c96cd2b6239f81ca74b91f1e4b337f4a7fc92f52dbf72ee9e5442