[INFO] cloning repository https://github.com/drbh/prepper
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/drbh/prepper" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdrbh%2Fprepper", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdrbh%2Fprepper'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d45bb0f8a1ddf8c67d48f51d437d5afb0095be15
[INFO] checking drbh/prepper against master#d9563937fa3b030c5845811113505070109414d2 for pr-151830
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdrbh%2Fprepper" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/drbh/prepper
[INFO] finished tweaking git repo https://github.com/drbh/prepper
[INFO] tweaked toml for git repo https://github.com/drbh/prepper written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/drbh/prepper on toolchain d9563937fa3b030c5845811113505070109414d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d9563937fa3b030c5845811113505070109414d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/drbh/prepper 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" "+d9563937fa3b030c5845811113505070109414d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: failed to select a version for `serde`.
[INFO] [stderr]     ... required by package `thread-rule-engine v0.1.0`
[INFO] [stderr]     ... which satisfies dependency `thread-rule-engine = "^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 `prepper v0.0.0 (/workspace/builds/worker-4-tc1/source)`
[INFO] [stderr] versions that meet the requirements `^1.0.228` are: 1.0.228
[INFO] [stderr] 
[INFO] [stderr] all possible versions conflict with previously selected packages.
[INFO] [stderr] 
[INFO] [stderr]   previously selected package `serde v1.0.130`
[INFO] [stderr]     ... which satisfies dependency `serde = "^1.0.130"` (locked to 1.0.130) of package `prepper v0.0.0 (/workspace/builds/worker-4-tc1/source)`
[INFO] [stderr] 
[INFO] [stderr] failed to select a version for `serde` which could resolve this conflict


command failed: exit status: 101

    Updating crates.io index
error: failed to select a version for `serde`.
    ... required by package `thread-rule-engine v0.1.0`
    ... which satisfies dependency `thread-rule-engine = "^0.1.0"` of package `thread v0.1.0`
    ... which satisfies dependency `thread = "^0.1.0"` (locked to 0.1.0) of package `prepper v0.0.0 (/workspace/builds/worker-4-tc1/source)`
versions that meet the requirements `^1.0.228` are: 1.0.228

all possible versions conflict with previously selected packages.

  previously selected package `serde v1.0.130`
    ... which satisfies dependency `serde = "^1.0.130"` (locked to 1.0.130) of package `prepper v0.0.0 (/workspace/builds/worker-4-tc1/source)`

failed to select a version for `serde` which could resolve this conflict