[INFO] cloning repository https://github.com/CraigHarley/MinimalRustKernel
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/CraigHarley/MinimalRustKernel" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCraigHarley%2FMinimalRustKernel", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCraigHarley%2FMinimalRustKernel'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ab128cda5cf19b96c3a7b7e61728477b6f861df3
[INFO] checking CraigHarley/MinimalRustKernel against master#91775dbec9771aa0c1b9ebe268eb5bd271e79a7a for pr-139087-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCraigHarley%2FMinimalRustKernel" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/CraigHarley/MinimalRustKernel
[INFO] finished tweaking git repo https://github.com/CraigHarley/MinimalRustKernel
[INFO] tweaked toml for git repo https://github.com/CraigHarley/MinimalRustKernel written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/CraigHarley/MinimalRustKernel on toolchain 91775dbec9771aa0c1b9ebe268eb5bd271e79a7a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+91775dbec9771aa0c1b9ebe268eb5bd271e79a7a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/CraigHarley/MinimalRustKernel already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+91775dbec9771aa0c1b9ebe268eb5bd271e79a7a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[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 x86_64 v0.2.14
[INFO] [stderr]   Downloaded array-init v0.0.3
[INFO] [stderr]   Downloaded spin v0.4.10
[INFO] [stderr]   Downloaded os_bootinfo v0.2.1
[INFO] [stderr]   Downloaded ux v0.1.3
[INFO] [stderr]   Downloaded bit_field v0.9.0
[INFO] [stderr]   Downloaded fixedvec v0.2.3
[INFO] [stderr]   Downloaded bitflags v1.0.4
[INFO] [stderr]   Downloaded nodrop v0.1.13
[INFO] [stderr]   Downloaded xmas-elf v0.6.2
[INFO] [stderr]   Downloaded unicode-width v0.1.5
[INFO] [stderr]   Downloaded lazy_static v1.2.0
[INFO] [stderr]   Downloaded usize_conversions v0.2.0
[INFO] [stderr]   Downloaded remove_dir_all v0.5.1
[INFO] [stderr]   Downloaded font8x8 v0.2.4
[INFO] [stderr]   Downloaded rand v0.4.3
[INFO] [stderr]   Downloaded getopts v0.2.18
[INFO] [stderr]   Downloaded skeptic v0.5.0
[INFO] [stderr]   Downloaded uart_16550 v0.1.0
[INFO] [stderr]   Downloaded volatile v0.2.5
[INFO] [stderr]   Downloaded pulldown-cmark v0.0.3
[INFO] [stderr]   Downloaded tempdir v0.3.7
[INFO] [stderr]   Downloaded zero v0.1.2
[INFO] [stderr]   Downloaded bootloader v0.3.11
[INFO] [stderr] error: failed to parse manifest at `/workspace/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/bootloader-0.3.11/Cargo.toml`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   the cargo feature `publish-lockfile` has been removed in the 1.37 release
[INFO] [stderr] 
[INFO] [stderr]   This package cannot be used with this version of Cargo, as the unstable feature `publish-lockfile` is no longer supported.
[INFO] [stderr]   See https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#publish-lockfile for more information about using this feature.


overridden task result to prepare-fail:unknown

Caused by:
    broken dependencies: 
    
        Blocking waiting for file lock on package cache
        Updating crates.io index
        Blocking waiting for file lock on package cache
        Blocking waiting for file lock on package cache
     Downloading crates ...
      Downloaded x86_64 v0.2.14
      Downloaded array-init v0.0.3
      Downloaded spin v0.4.10
      Downloaded os_bootinfo v0.2.1
      Downloaded ux v0.1.3
      Downloaded bit_field v0.9.0
      Downloaded fixedvec v0.2.3
      Downloaded bitflags v1.0.4
      Downloaded nodrop v0.1.13
      Downloaded xmas-elf v0.6.2
      Downloaded unicode-width v0.1.5
      Downloaded lazy_static v1.2.0
      Downloaded usize_conversions v0.2.0
      Downloaded remove_dir_all v0.5.1
      Downloaded font8x8 v0.2.4
      Downloaded rand v0.4.3
      Downloaded getopts v0.2.18
      Downloaded skeptic v0.5.0
      Downloaded uart_16550 v0.1.0
      Downloaded volatile v0.2.5
      Downloaded pulldown-cmark v0.0.3
      Downloaded tempdir v0.3.7
      Downloaded zero v0.1.2
      Downloaded bootloader v0.3.11
    error: failed to parse manifest at `/workspace/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/bootloader-0.3.11/Cargo.toml`
    
    Caused by:
      the cargo feature `publish-lockfile` has been removed in the 1.37 release
    
      This package cannot be used with this version of Cargo, as the unstable feature `publish-lockfile` is no longer supported.
      See https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#publish-lockfile for more information about using this feature.