[INFO] cloning repository https://github.com/ejlangev/rust_os
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ejlangev/rust_os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fejlangev%2Frust_os", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fejlangev%2Frust_os'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c103789ef4f17e09976108402bc57b5fe09534b6
[INFO] checking ejlangev/rust_os against master#c8a31b780d5415358566a20b94912620a3f27067 for pr-139493-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fejlangev%2Frust_os" "/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/ejlangev/rust_os
[INFO] finished tweaking git repo https://github.com/ejlangev/rust_os
[INFO] tweaked toml for git repo https://github.com/ejlangev/rust_os written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ejlangev/rust_os on toolchain c8a31b780d5415358566a20b94912620a3f27067
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c8a31b780d5415358566a20b94912620a3f27067" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/ejlangev/rust_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" "+c8a31b780d5415358566a20b94912620a3f27067" "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 xmas-elf v0.6.2
[INFO] [stderr]   Downloaded volatile v0.2.5
[INFO] [stderr]   Downloaded font8x8 v0.2.4
[INFO] [stderr]   Downloaded fixedvec v0.2.3
[INFO] [stderr]   Downloaded x86_64 v0.2.14
[INFO] [stderr]   Downloaded lazy_static v1.2.0
[INFO] [stderr]   Downloaded array-init v0.0.3
[INFO] [stderr]   Downloaded skeptic v0.5.0
[INFO] [stderr]   Downloaded spin v0.4.10
[INFO] [stderr]   Downloaded getopts v0.2.18
[INFO] [stderr]   Downloaded libc v0.2.44
[INFO] [stderr]   Downloaded winapi v0.3.6
[INFO] [stderr]   Downloaded zero v0.1.2
[INFO] [stderr]   Downloaded bootloader v0.3.7
[INFO] [stderr] error: failed to parse manifest at `/workspace/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/bootloader-0.3.7/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
    Blocking waiting for file lock on package cache
 Downloading crates ...
  Downloaded xmas-elf v0.6.2
  Downloaded volatile v0.2.5
  Downloaded font8x8 v0.2.4
  Downloaded fixedvec v0.2.3
  Downloaded x86_64 v0.2.14
  Downloaded lazy_static v1.2.0
  Downloaded array-init v0.0.3
  Downloaded skeptic v0.5.0
  Downloaded spin v0.4.10
  Downloaded getopts v0.2.18
  Downloaded libc v0.2.44
  Downloaded winapi v0.3.6
  Downloaded zero v0.1.2
  Downloaded bootloader v0.3.7
error: failed to parse manifest at `/workspace/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/bootloader-0.3.7/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.