[INFO] cloning repository https://github.com/Christophorus3/c_os
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Christophorus3/c_os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FChristophorus3%2Fc_os", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FChristophorus3%2Fc_os'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e0684c540f940dfc1c441315aaf30bb695c8a69c
[INFO] checking Christophorus3/c_os against master#2fcf1776b9ccef89993dfe40e9f5c4908e2d2d48 for pr-142723
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FChristophorus3%2Fc_os" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Christophorus3/c_os on toolchain 2fcf1776b9ccef89993dfe40e9f5c4908e2d2d48
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2fcf1776b9ccef89993dfe40e9f5c4908e2d2d48" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Christophorus3/c_os
[INFO] finished tweaking git repo https://github.com/Christophorus3/c_os
[INFO] tweaked toml for git repo https://github.com/Christophorus3/c_os written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/Christophorus3/c_os 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" "+2fcf1776b9ccef89993dfe40e9f5c4908e2d2d48" "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]  Downloading crates ...
[INFO] [stderr]   Downloaded ux v0.1.3
[INFO] [stderr]   Downloaded volatile v0.2.6
[INFO] [stderr]   Downloaded array-init v0.0.4
[INFO] [stderr]   Downloaded cc v1.0.34
[INFO] [stderr]   Downloaded bit_field v0.9.0
[INFO] [stderr]   Downloaded lazy_static v1.3.0
[INFO] [stderr]   Downloaded raw-cpuid v6.1.0
[INFO] [stderr]   Downloaded array-init v0.0.3
[INFO] [stderr]   Downloaded font8x8 v0.2.4
[INFO] [stderr]   Downloaded pulldown-cmark v0.0.3
[INFO] [stderr]   Downloaded spin v0.5.0
[INFO] [stderr]   Downloaded spin v0.4.10
[INFO] [stderr]   Downloaded x86_64 v0.3.6
[INFO] [stderr]   Downloaded x86_64 v0.2.14
[INFO] [stderr]   Downloaded libc v0.2.50
[INFO] [stderr]   Downloaded getopts v0.2.18
[INFO] [stderr]   Downloaded skeptic v0.5.0
[INFO] [stderr]   Downloaded fixedvec v0.2.3
[INFO] [stderr]   Downloaded zero v0.1.2
[INFO] [stderr]   Downloaded xmas-elf v0.6.2
[INFO] [stderr]   Downloaded os_bootinfo v0.2.1
[INFO] [stderr]   Downloaded usize_conversions v0.2.0
[INFO] [stderr]   Downloaded x86_64 v0.5.3
[INFO] [stderr]   Downloaded uart_16550 v0.1.0
[INFO] [stderr]   Downloaded bootloader v0.4.0
[INFO] [stderr] error: failed to parse manifest at `/workspace/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/bootloader-0.4.0/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.


command failed: exit status: 101

    Blocking waiting for file lock on package cache
    Updating crates.io index
    Blocking waiting for file lock on package cache
 Downloading crates ...
  Downloaded ux v0.1.3
  Downloaded volatile v0.2.6
  Downloaded array-init v0.0.4
  Downloaded cc v1.0.34
  Downloaded bit_field v0.9.0
  Downloaded lazy_static v1.3.0
  Downloaded raw-cpuid v6.1.0
  Downloaded array-init v0.0.3
  Downloaded font8x8 v0.2.4
  Downloaded pulldown-cmark v0.0.3
  Downloaded spin v0.5.0
  Downloaded spin v0.4.10
  Downloaded x86_64 v0.3.6
  Downloaded x86_64 v0.2.14
  Downloaded libc v0.2.50
  Downloaded getopts v0.2.18
  Downloaded skeptic v0.5.0
  Downloaded fixedvec v0.2.3
  Downloaded zero v0.1.2
  Downloaded xmas-elf v0.6.2
  Downloaded os_bootinfo v0.2.1
  Downloaded usize_conversions v0.2.0
  Downloaded x86_64 v0.5.3
  Downloaded uart_16550 v0.1.0
  Downloaded bootloader v0.4.0
error: failed to parse manifest at `/workspace/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/bootloader-0.4.0/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.