[INFO] updating cached repository https://github.com/mthom/rusty-wam
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/mthom/rusty-wam
[INFO] [stderr]    be3cdcd..1d79e22  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1d79e2246815eed8e58bf0d6985891721046a7f6
[INFO] checking mthom/rusty-wam against try#e6563ac70cbfd3196492061900e9e9793e065e4d for pr-69410
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmthom%2Frusty-wam" "/workspace/builds/worker-0/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mthom/rusty-wam on toolchain e6563ac70cbfd3196492061900e9e9793e065e4d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e6563ac70cbfd3196492061900e9e9793e065e4d" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/mthom/rusty-wam
[INFO] finished tweaking git repo https://github.com/mthom/rusty-wam
[INFO] tweaked toml for git repo https://github.com/mthom/rusty-wam written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/mthom/rusty-wam already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e6563ac70cbfd3196492061900e9e9793e065e4d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded prolog_parser v0.8.41
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+e6563ac70cbfd3196492061900e9e9793e065e4d" "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] 5e98cc458f445d53f095722f42747c6a43f6130493eed6f0536c50b4ddb7ab05
[INFO] running `"docker" "start" "-a" "5e98cc458f445d53f095722f42747c6a43f6130493eed6f0536c50b4ddb7ab05"`
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking cfg-if v0.1.7
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]    Compiling ryu v0.2.7
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling nix v0.14.1
[INFO] [stderr]    Compiling rug v1.5.2
[INFO] [stderr]     Checking static_assertions v0.2.5
[INFO] [stderr]     Checking unicode-segmentation v1.3.0
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling indexmap v1.1.0
[INFO] [stderr]    Compiling nix v0.15.0
[INFO] [stderr]     Checking utf8parse v0.1.1
[INFO] [stderr]     Checking unicode-width v0.1.6
[INFO] [stderr]     Checking ref_thread_local v0.0.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking downcast v0.10.0
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]     Checking stackvector v1.0.2
[INFO] [stderr]    Compiling num-traits v0.2.9
[INFO] [stderr]     Checking smallvec v0.6.13
[INFO] [stderr]    Compiling scryer-prolog v0.8.118 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking lexical-core v0.4.0
[INFO] [stderr]     Checking unicode_reader v1.0.0
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking ordered-float v0.5.2
[INFO] [stderr]     Checking dirs-sys v0.3.4
[INFO] [stderr]     Checking termion v1.5.1
[INFO] [stderr]     Checking dirs v2.0.2
[INFO] [stderr]     Checking lexical v2.1.0
[INFO] [stderr]    Compiling gmp-mpfr-sys v1.1.14
[INFO] [stderr]     Checking rustyline v5.0.3
[INFO] [stderr]     Checking prolog_parser v0.8.41
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/prolog/heap_print.rs:409:13
[INFO] [stderr]     |
[INFO] [stderr] 409 |             (iter.next() == Some(']') && iter.next().is_none())
[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/prolog/heap_print.rs:411:13
[INFO] [stderr]     |
[INFO] [stderr] 411 |             (iter.next() == Some('}') && iter.next().is_none())
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/prolog/heap_print.rs:409:13
[INFO] [stderr]     |
[INFO] [stderr] 409 |             (iter.next() == Some(']') && iter.next().is_none())
[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/prolog/heap_print.rs:411:13
[INFO] [stderr]     |
[INFO] [stderr] 411 |             (iter.next() == Some('}') && iter.next().is_none())
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `reset`
[INFO] [stderr]    --> src/prolog/machine/mod.rs:295:5
[INFO] [stderr]     |
[INFO] [stderr] 295 |     pub fn reset(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5m 04s
[INFO] running `"docker" "inspect" "5e98cc458f445d53f095722f42747c6a43f6130493eed6f0536c50b4ddb7ab05"`
[INFO] running `"docker" "rm" "-f" "5e98cc458f445d53f095722f42747c6a43f6130493eed6f0536c50b4ddb7ab05"`
[INFO] [stdout] 5e98cc458f445d53f095722f42747c6a43f6130493eed6f0536c50b4ddb7ab05