[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]    00b3854..1b5cf49  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1b5cf493d6a216039aac8acfed25b15a29e3831c
[INFO] checking mthom/rusty-wam against try#f149601db42efe10ece8b284ab681fd4a6fcb89c for pr-68766
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmthom%2Frusty-wam" "/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/mthom/rusty-wam on toolchain f149601db42efe10ece8b284ab681fd4a6fcb89c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+f149601db42efe10ece8b284ab681fd4a6fcb89c" "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-12/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" "+f149601db42efe10ece8b284ab681fd4a6fcb89c" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded prolog_parser v0.8.39
[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" "+f149601db42efe10ece8b284ab681fd4a6fcb89c" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 7a9ab650f0f14416bbe92ad3f58ba90f1e288dab1b25a09ef9e3cc8fb169c09b
[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" "7a9ab650f0f14416bbe92ad3f58ba90f1e288dab1b25a09ef9e3cc8fb169c09b"`
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]     Checking static_assertions v0.2.5
[INFO] [stderr]    Compiling rug v1.5.2
[INFO] [stderr]     Checking ref_thread_local v0.0.0
[INFO] [stderr]     Checking downcast v0.10.0
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]    Compiling scryer-prolog v0.8.117 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking log v0.4.8
[INFO] [stderr]     Checking unicode_reader v1.0.0
[INFO] [stderr]     Checking stackvector v1.0.2
[INFO] [stderr]     Checking ordered-float v0.5.2
[INFO] [stderr]     Checking lexical-core v0.4.0
[INFO] [stderr]     Checking dirs-sys v0.3.4
[INFO] [stderr]     Checking nix v0.14.1
[INFO] [stderr]     Checking termion v1.5.1
[INFO] [stderr]     Checking nix v0.15.0
[INFO] [stderr]     Checking lexical v2.1.0
[INFO] [stderr]     Checking dirs v2.0.2
[INFO] [stderr]    Compiling gmp-mpfr-sys v1.1.14
[INFO] [stderr]     Checking rustyline v5.0.3
[INFO] [stderr]     Checking prolog_parser v0.8.39
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/prolog/heap_print.rs:410:13
[INFO] [stderr]     |
[INFO] [stderr] 410 |             (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:412:13
[INFO] [stderr]     |
[INFO] [stderr] 412 |             (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:410:13
[INFO] [stderr]     |
[INFO] [stderr] 410 |             (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:412:13
[INFO] [stderr]     |
[INFO] [stderr] 412 |             (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:293:5
[INFO] [stderr]     |
[INFO] [stderr] 293 |     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 4m 56s
[INFO] running `"docker" "inspect" "7a9ab650f0f14416bbe92ad3f58ba90f1e288dab1b25a09ef9e3cc8fb169c09b"`
[INFO] running `"docker" "rm" "-f" "7a9ab650f0f14416bbe92ad3f58ba90f1e288dab1b25a09ef9e3cc8fb169c09b"`
[INFO] [stdout] 7a9ab650f0f14416bbe92ad3f58ba90f1e288dab1b25a09ef9e3cc8fb169c09b