[INFO] cloning repository https://github.com/jduimovich/rustgc
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jduimovich/rustgc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjduimovich%2Frustgc"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjduimovich%2Frustgc'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8b468e3e2d90393f96f0583e4878613c88541c5a
[INFO] checking jduimovich/rustgc against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjduimovich%2Frustgc" "/workspace/builds/worker-12/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jduimovich/rustgc on toolchain e4dba30b9b475d8750370c4dfb49b6541990904d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/jduimovich/rustgc
[INFO] finished tweaking git repo https://github.com/jduimovich/rustgc
[INFO] tweaked toml for git repo https://github.com/jduimovich/rustgc written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/jduimovich/rustgc already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "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] b62ede5be826893643e8f308f76e79666723a9d66aa971d7d783a3a646d70cda
[INFO] running `"docker" "start" "-a" "b62ede5be826893643e8f308f76e79666723a9d66aa971d7d783a3a646d70cda"`
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking rustgc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/gc/mod.rs:109:5
[INFO] [stderr]     |
[INFO] [stderr] 109 |     (mem)
[INFO] [stderr]     |     ^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/gc/mod.rs:131:5
[INFO] [stderr]     |
[INFO] [stderr] 131 |     (result)
[INFO] [stderr]     |     ^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/gc/mod.rs:203:4
[INFO] [stderr]     |
[INFO] [stderr] 203 |    ((self.mark_bits[obj / MARK_BITS_PER_SLOT] & (1 << (obj % MARK_BITS_PER_SLOT))) != 0 )
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/gc/mod.rs:245:5
[INFO] [stderr]     |
[INFO] [stderr] 245 |     (0)
[INFO] [stderr]     |     ^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]  --> src/rnd/mod.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 |     (rng.gen::<usize>() % range)
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/gc/mod.rs:109:5
[INFO] [stderr]     |
[INFO] [stderr] 109 |     (mem)
[INFO] [stderr]     |     ^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/gc/mod.rs:131:5
[INFO] [stderr]     |
[INFO] [stderr] 131 |     (result)
[INFO] [stderr]     |     ^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/gc/mod.rs:203:4
[INFO] [stderr]     |
[INFO] [stderr] 203 |    ((self.mark_bits[obj / MARK_BITS_PER_SLOT] & (1 << (obj % MARK_BITS_PER_SLOT))) != 0 )
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/gc/mod.rs:245:5
[INFO] [stderr]     |
[INFO] [stderr] 245 |     (0)
[INFO] [stderr]     |     ^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]  --> src/rnd/mod.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 |     (rng.gen::<usize>() % range)
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: 5 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 5 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.82s
[INFO] running `"docker" "inspect" "b62ede5be826893643e8f308f76e79666723a9d66aa971d7d783a3a646d70cda"`
[INFO] running `"docker" "rm" "-f" "b62ede5be826893643e8f308f76e79666723a9d66aa971d7d783a3a646d70cda"`
[INFO] [stdout] b62ede5be826893643e8f308f76e79666723a9d66aa971d7d783a3a646d70cda