[INFO] cloning repository https://github.com/meganomic/megamonic
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/meganomic/megamonic" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmeganomic%2Fmegamonic", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmeganomic%2Fmegamonic'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 51e9f991558ef538e7b66ebc33f0859daea9c358
[INFO] testing meganomic/megamonic against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmeganomic%2Fmegamonic" "/workspace/builds/worker-55/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-55/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/meganomic/megamonic on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/meganomic/megamonic
[INFO] finished tweaking git repo https://github.com/meganomic/megamonic
[INFO] tweaked toml for git repo https://github.com/meganomic/megamonic written to /workspace/builds/worker-55/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-55/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-55/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f9e464ed7eea57b09da84b89bb2d390170dc20c5256766dfd7a69c5751fef213
[INFO] running `Command { std: "docker" "start" "-a" "f9e464ed7eea57b09da84b89bb2d390170dc20c5256766dfd7a69c5751fef213", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f9e464ed7eea57b09da84b89bb2d390170dc20c5256766dfd7a69c5751fef213", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9e464ed7eea57b09da84b89bb2d390170dc20c5256766dfd7a69c5751fef213", kill_on_drop: false }`
[INFO] [stdout] f9e464ed7eea57b09da84b89bb2d390170dc20c5256766dfd7a69c5751fef213
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-55/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-55/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 29aedc393aefa893c3e893c9ea74bd9a173a92f03e44acbfb30c33f44222657f
[INFO] running `Command { std: "docker" "start" "-a" "29aedc393aefa893c3e893c9ea74bd9a173a92f03e44acbfb30c33f44222657f", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.81
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]    Compiling strsim v0.9.3
[INFO] [stderr]    Compiling ident_case v1.0.1
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling version_check v0.9.3
[INFO] [stderr]    Compiling libsensors-sys v0.2.0
[INFO] [stderr]    Compiling unicode-width v0.1.9
[INFO] [stderr]    Compiling anyhow v1.0.48
[INFO] [stderr]    Compiling bitflags v1.3.2
[INFO] [stderr]    Compiling once_cell v1.8.0
[INFO] [stderr]    Compiling megamonic v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling static_assertions v1.1.0
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]    Compiling ansi_term v0.11.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling libloading v0.6.7
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling nvml-wrapper-sys v0.5.0
[INFO] [stderr]    Compiling ahash v0.7.6
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling libc-strftime v0.2.0
[INFO] [stderr]    Compiling sensors v0.2.1
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling btoi v0.4.2
[INFO] [stderr]    Compiling darling_core v0.10.2
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]    Compiling darling_macro v0.10.2
[INFO] [stderr]    Compiling thiserror v1.0.30
[INFO] [stderr]    Compiling darling v0.10.2
[INFO] [stderr]    Compiling wrapcenum-derive v0.4.0
[INFO] [stderr]    Compiling nvml-wrapper v0.7.0
[INFO] [stdout] error[E0658]: use of unstable library feature 'iter_intersperse': recently added
[INFO] [stdout]    --> src/system/processes.rs:207:61
[INFO] [stdout]     |
[INFO] [stdout] 207 | ...                   let cmdline: String = split.intersperse(" ").collect();
[INFO] [stdout]     |                                                   ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #79524 <https://github.com/rust-lang/rust/issues/79524> for more information
[INFO] [stdout]     = help: add `#![feature(iter_intersperse)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0658`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `megamonic` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "29aedc393aefa893c3e893c9ea74bd9a173a92f03e44acbfb30c33f44222657f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "29aedc393aefa893c3e893c9ea74bd9a173a92f03e44acbfb30c33f44222657f", kill_on_drop: false }`
[INFO] [stdout] 29aedc393aefa893c3e893c9ea74bd9a173a92f03e44acbfb30c33f44222657f