[INFO] cloning repository https://github.com/bugabinga/buga_os
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bugabinga/buga_os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbugabinga%2Fbuga_os", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbugabinga%2Fbuga_os'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6d9e8077a9e8b10b0990482d6ac8174a609d4234
[INFO] checking bugabinga/buga_os against master#dfd7b8d03fb93d0e03147d28b3be6d93260fa94d for pr-87050
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbugabinga%2Fbuga_os" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bugabinga/buga_os on toolchain dfd7b8d03fb93d0e03147d28b3be6d93260fa94d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/bugabinga/buga_os
[INFO] finished tweaking git repo https://github.com/bugabinga/buga_os
[INFO] tweaked toml for git repo https://github.com/bugabinga/buga_os written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/bugabinga/buga_os already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 549d3afa5309e959fe88e2f8de4faf559f12d8710b1e7870c9df375d00ee6fe7
[INFO] running `Command { std: "docker" "start" "-a" "549d3afa5309e959fe88e2f8de4faf559f12d8710b1e7870c9df375d00ee6fe7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "549d3afa5309e959fe88e2f8de4faf559f12d8710b1e7870c9df375d00ee6fe7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "549d3afa5309e959fe88e2f8de4faf559f12d8710b1e7870c9df375d00ee6fe7", kill_on_drop: false }`
[INFO] [stdout] 549d3afa5309e959fe88e2f8de4faf559f12d8710b1e7870c9df375d00ee6fe7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9447df23dc74f08523da510fde92d2b19230136f2a2489fc5b03e4096432f96c
[INFO] running `Command { std: "docker" "start" "-a" "9447df23dc74f08523da510fde92d2b19230136f2a2489fc5b03e4096432f96c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.40
[INFO] [stderr]    Compiling cc v1.0.15
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling serde v1.0.52
[INFO] [stderr]    Compiling rustc-demangle v0.1.8
[INFO] [stderr]    Compiling spin v0.4.8
[INFO] [stderr]    Compiling cfg-if v0.1.3
[INFO] [stderr]    Compiling ucd-util v0.1.1
[INFO] [stderr]    Compiling dtoa v0.4.2
[INFO] [stderr]    Compiling itoa v0.4.1
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling pulldown-cmark v0.1.2
[INFO] [stderr]    Compiling getopts v0.2.17
[INFO] [stderr]    Compiling either v1.5.0
[INFO] [stderr]    Compiling bitflags v0.9.1
[INFO] [stderr]    Compiling clippy v0.0.197
[INFO] [stderr]    Compiling quine-mc_cluskey v0.2.4
[INFO] [stderr]     Checking volatile v0.2.4
[INFO] [stderr]    Compiling unicode-bidi v0.3.4
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/spin-0.4.8/src/lib.rs:8:43
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![cfg_attr(feature = "const_fn", feature(const_fn, const_unsafe_cell_new, const_atomic_usize_new))]
[INFO] [stdout]   |                                           ^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: split into finer-grained feature gates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the legacy LLVM-style asm! syntax is no longer supported
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/spin-0.4.8/src/util.rs:8:14
[INFO] [stdout]   |
[INFO] [stdout] 8 |     unsafe { asm!("pause" :::: "volatile"); }
[INFO] [stdout]   |              ----^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |              |
[INFO] [stdout]   |              help: replace with: `llvm_asm!`
[INFO] [stdout]   |
[INFO] [stdout]   = note: consider migrating to the new asm! syntax specified in RFC 2873
[INFO] [stdout]   = note: alternatively, switch to llvm_asm! to keep your code working as it is
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/spin-0.4.8/src/lib.rs:8:43
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![cfg_attr(feature = "const_fn", feature(const_fn, const_unsafe_cell_new, const_atomic_usize_new))]
[INFO] [stdout]   |                                           ^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: split into finer-grained feature gates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling unreachable v1.0.0
[INFO] [stdout] error: the legacy LLVM-style asm! syntax is no longer supported
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/spin-0.4.8/src/util.rs:8:14
[INFO] [stdout]   |
[INFO] [stdout] 8 |     unsafe { asm!("pause" :::: "volatile"); }
[INFO] [stdout]   |              ----^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |              |
[INFO] [stdout]   |              help: replace with: `llvm_asm!`
[INFO] [stdout]   |
[INFO] [stdout]   = note: consider migrating to the new asm! syntax specified in RFC 2873
[INFO] [stdout]   = note: alternatively, switch to llvm_asm! to keep your code working as it is
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling proc-macro2 v0.3.8
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0557`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `spin`
[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 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0557`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "9447df23dc74f08523da510fde92d2b19230136f2a2489fc5b03e4096432f96c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9447df23dc74f08523da510fde92d2b19230136f2a2489fc5b03e4096432f96c", kill_on_drop: false }`
[INFO] [stdout] 9447df23dc74f08523da510fde92d2b19230136f2a2489fc5b03e4096432f96c