[INFO] cloning repository https://github.com/Xiulf/lowlang
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Xiulf/lowlang" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FXiulf%2Flowlang", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FXiulf%2Flowlang'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 632f747baf681d037c5d731b6b6e68967a83f207
[INFO] checking Xiulf/lowlang against master#36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923 for pr-81863
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FXiulf%2Flowlang" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Xiulf/lowlang on toolchain 36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Xiulf/lowlang
[INFO] finished tweaking git repo https://github.com/Xiulf/lowlang
[INFO] tweaked toml for git repo https://github.com/Xiulf/lowlang written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/Xiulf/lowlang already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] c29806db6376578ccf532fcf19d63683038f42954272b1f573dea8a4614f99d1
[INFO] running `Command { std: "docker" "start" "-a" "c29806db6376578ccf532fcf19d63683038f42954272b1f573dea8a4614f99d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c29806db6376578ccf532fcf19d63683038f42954272b1f573dea8a4614f99d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c29806db6376578ccf532fcf19d63683038f42954272b1f573dea8a4614f99d1", kill_on_drop: false }`
[INFO] [stdout] c29806db6376578ccf532fcf19d63683038f42954272b1f573dea8a4614f99d1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 62608c35f45c7fecff3d2457fea3fcba30362777b32ef03e936ccaeb6c4340c2
[INFO] running `Command { std: "docker" "start" "-a" "62608c35f45c7fecff3d2457fea3fcba30362777b32ef03e936ccaeb6c4340c2", kill_on_drop: false }`
[INFO] [stderr]    Compiling target-lexicon v0.11.1
[INFO] [stderr]     Checking linked-hash-map v0.5.4
[INFO] [stderr]     Checking index_vec v0.1.2
[INFO] [stderr]    Compiling syn v1.0.54
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]    Compiling getrandom v0.1.15
[INFO] [stderr]    Compiling cranelift-entity v0.68.0
[INFO] [stderr]    Compiling cranelift-codegen-shared v0.68.0
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]     Checking smallvec v1.5.1
[INFO] [stderr]     Checking rustc-hash v1.1.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking hashbrown v0.9.1
[INFO] [stderr]    Compiling anyhow v1.0.35
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]    Compiling indexmap v1.6.0
[INFO] [stderr]     Checking linked_hash_set v0.1.4
[INFO] [stderr]     Checking cranelift-bforest v0.68.0
[INFO] [stderr]    Compiling cranelift-codegen-meta v0.68.0
[INFO] [stderr]     Checking regalloc v0.0.31
[INFO] [stderr]     Checking object v0.21.1
[INFO] [stderr]     Checking ir v0.1.0 (/opt/rustwide/workdir/ir)
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stdout] error[E0599]: no method named `fold_first` found for struct `Map<std::vec::IntoIter<Block>, [closure@ir/src/graph.rs:85:22: 85:68]>` in the current scope
[INFO] [stdout]   --> ir/src/graph.rs:86:18
[INFO] [stdout]    |
[INFO] [stdout] 86 |                 .fold_first(|a, b| a.intersection(&b).copied().collect())
[INFO] [stdout]    |                  ^^^^^^^^^^ method not found in `Map<std::vec::IntoIter<Block>, [closure@ir/src/graph.rs:85:22: 85:68]>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `fold_first` found for struct `Map<std::vec::IntoIter<Block>, [closure@ir/src/graph.rs:85:22: 85:68]>` in the current scope
[INFO] [stdout]   --> ir/src/graph.rs:86:18
[INFO] [stdout]    |
[INFO] [stdout] 86 |                 .fold_first(|a, b| a.intersection(&b).copied().collect())
[INFO] [stdout]    |                  ^^^^^^^^^^ method not found in `Map<std::vec::IntoIter<Block>, [closure@ir/src/graph.rs:85:22: 85:68]>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ir`
[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] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "62608c35f45c7fecff3d2457fea3fcba30362777b32ef03e936ccaeb6c4340c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "62608c35f45c7fecff3d2457fea3fcba30362777b32ef03e936ccaeb6c4340c2", kill_on_drop: false }`
[INFO] [stdout] 62608c35f45c7fecff3d2457fea3fcba30362777b32ef03e936ccaeb6c4340c2