[INFO] fetching crate montage 0.1.0...
[INFO] checking montage-0.1.0 against master#b2f1ccf524a3a4cf9c34545167cc23b659cf1cbd for pr-155499
[INFO] extracting crate montage 0.1.0 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate montage 0.1.0
[INFO] finished tweaking crates.io crate montage 0.1.0
[INFO] tweaked toml for crates.io crate montage 0.1.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate montage 0.1.0 on toolchain b2f1ccf524a3a4cf9c34545167cc23b659cf1cbd
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b2f1ccf524a3a4cf9c34545167cc23b659cf1cbd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate montage 0.1.0 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" "+b2f1ccf524a3a4cf9c34545167cc23b659cf1cbd" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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 `montage v0.1.0 (/workspace/builds/worker-7-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"` (locked to 1.0.0) of package `crossbeam-deque v0.8.1`
[INFO] [stderr]     ... which satisfies dependency `crossbeam-deque = "^0.8.0"` (locked to 0.8.1) of package `rayon v1.5.1`
[INFO] [stderr]     ... which satisfies dependency `rayon = "^1.5.1"` (locked to 1.5.1) of package `montage v0.1.0 (/workspace/builds/worker-7-tc1/source)`
[INFO] [stderr] 
[INFO] [stderr] failed to select a version for `cfg-if` which could resolve this conflict


overridden task result to prepare-fail:unknown

Caused by:
    0: uncategorized prepare error
    1: command failed: exit status: 101
       
           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 `montage v0.1.0 (/workspace/builds/worker-7-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"` (locked to 1.0.0) of package `crossbeam-deque v0.8.1`
           ... which satisfies dependency `crossbeam-deque = "^0.8.0"` (locked to 0.8.1) of package `rayon v1.5.1`
           ... which satisfies dependency `rayon = "^1.5.1"` (locked to 1.5.1) of package `montage v0.1.0 (/workspace/builds/worker-7-tc1/source)`
       
       failed to select a version for `cfg-if` which could resolve this conflict