[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] testing Xiulf/lowlang against master#62efba8a050c64249dab942951bb28f710208bc8 for pr-90799
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FXiulf%2Flowlang" "/workspace/builds/worker-18/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-18/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Xiulf/lowlang on toolchain 62efba8a050c64249dab942951bb28f710208bc8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "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-18/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" "+62efba8a050c64249dab942951bb28f710208bc8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded anyhow v1.0.35
[INFO] [stderr]   Downloaded cranelift v0.68.0
[INFO] [stderr]   Downloaded cranelift-module v0.68.0
[INFO] [stderr]   Downloaded index_vec v0.1.2
[INFO] [stderr]   Downloaded cranelift-object v0.68.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 575898738fbe12c43aac34e272a1a23bba8782b6b32957c6c5d0f9ecdd5f9060
[INFO] running `Command { std: "docker" "start" "-a" "575898738fbe12c43aac34e272a1a23bba8782b6b32957c6c5d0f9ecdd5f9060", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "575898738fbe12c43aac34e272a1a23bba8782b6b32957c6c5d0f9ecdd5f9060", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "575898738fbe12c43aac34e272a1a23bba8782b6b32957c6c5d0f9ecdd5f9060", kill_on_drop: false }`
[INFO] [stdout] 575898738fbe12c43aac34e272a1a23bba8782b6b32957c6c5d0f9ecdd5f9060
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 452783a50abde2969cc99d9ebfe61d0cd100975ee86203cd8cf73073131ae706
[INFO] running `Command { std: "docker" "start" "-a" "452783a50abde2969cc99d9ebfe61d0cd100975ee86203cd8cf73073131ae706", kill_on_drop: false }`
[INFO] [stderr]    Compiling target-lexicon v0.11.1
[INFO] [stderr]    Compiling cranelift-entity v0.68.0
[INFO] [stderr]    Compiling syn v1.0.54
[INFO] [stderr]    Compiling cranelift-codegen-shared v0.68.0
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling linked-hash-map v0.5.4
[INFO] [stderr]    Compiling rustc-hash v1.1.0
[INFO] [stderr]    Compiling index_vec v0.1.2
[INFO] [stderr]    Compiling anyhow v1.0.35
[INFO] [stderr]    Compiling remove_dir_all v0.5.3
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling getrandom v0.1.15
[INFO] [stderr]    Compiling indexmap v1.6.0
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]    Compiling regalloc v0.0.31
[INFO] [stderr]    Compiling linked_hash_set v0.1.4
[INFO] [stderr]    Compiling cranelift-codegen-meta v0.68.0
[INFO] [stderr]    Compiling cranelift-bforest v0.68.0
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling object v0.21.1
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling ir v0.1.0 (/opt/rustwide/workdir/ir)
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stdout] error[E0599]: no method named `fold_first` found for struct `Map` 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]    Compiling rand v0.7.3
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ir` due to 2 previous errors
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "452783a50abde2969cc99d9ebfe61d0cd100975ee86203cd8cf73073131ae706", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "452783a50abde2969cc99d9ebfe61d0cd100975ee86203cd8cf73073131ae706", kill_on_drop: false }`
[INFO] [stdout] 452783a50abde2969cc99d9ebfe61d0cd100975ee86203cd8cf73073131ae706