[INFO] cloning repository https://github.com/kodingbarengpetra/imrefs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kodingbarengpetra/imrefs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkodingbarengpetra%2Fimrefs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkodingbarengpetra%2Fimrefs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1be954befb481713a88fea6a5c88857585582469
[INFO] checking kodingbarengpetra/imrefs against master#64b72a1fa5449d928d5f553b01a596b78ee255d2 for pr-153457
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkodingbarengpetra%2Fimrefs" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/kodingbarengpetra/imrefs
[INFO] finished tweaking git repo https://github.com/kodingbarengpetra/imrefs
[INFO] tweaked toml for git repo https://github.com/kodingbarengpetra/imrefs written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/kodingbarengpetra/imrefs on toolchain 64b72a1fa5449d928d5f553b01a596b78ee255d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+64b72a1fa5449d928d5f553b01a596b78ee255d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/kodingbarengpetra/imrefs 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" "+64b72a1fa5449d928d5f553b01a596b78ee255d2" "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] error: failed to select a version for `cfg-if`.
[INFO] [stderr]     ... required by package `thread-services v0.1.0`
[INFO] [stderr]     ... which satisfies dependency `thread-services = "^0.1.0"` of package `thread v0.1.0`
[INFO] [stderr]     ... which satisfies dependency `thread = "^0.1.0"` (locked to 0.1.0) of package `imrefs v0.1.0 (/workspace/builds/worker-6-tc1/source)`
[INFO] [stderr] versions that meet the requirements `^1.0.4` are: 1.0.4
[INFO] [stderr] 
[INFO] [stderr] all possible versions conflict with previously selected packages.
[INFO] [stderr] 
[INFO] [stderr]   previously selected package `cfg-if v1.0.0`
[INFO] [stderr]     ... which satisfies dependency `cfg-if = "^1.0"` (locked to 1.0.0) of package `nix v0.26.1`
[INFO] [stderr]     ... which satisfies dependency `nix = "^0.26.1"` (locked to 0.26.1) of package `imrefs v0.1.0 (/workspace/builds/worker-6-tc1/source)`
[INFO] [stderr] 
[INFO] [stderr] failed to select a version for `cfg-if` which could resolve this conflict


command failed: exit status: 101

    Blocking waiting for file lock on package cache
    Updating crates.io index
error: failed to select a version for `cfg-if`.
    ... required by package `thread-services v0.1.0`
    ... which satisfies dependency `thread-services = "^0.1.0"` of package `thread v0.1.0`
    ... which satisfies dependency `thread = "^0.1.0"` (locked to 0.1.0) of package `imrefs v0.1.0 (/workspace/builds/worker-6-tc1/source)`
versions that meet the requirements `^1.0.4` are: 1.0.4

all possible versions conflict with previously selected packages.

  previously selected package `cfg-if v1.0.0`
    ... which satisfies dependency `cfg-if = "^1.0"` (locked to 1.0.0) of package `nix v0.26.1`
    ... which satisfies dependency `nix = "^0.26.1"` (locked to 0.26.1) of package `imrefs v0.1.0 (/workspace/builds/worker-6-tc1/source)`

failed to select a version for `cfg-if` which could resolve this conflict