[INFO] fetching crate ruvolt 0.5.0...
[INFO] testing ruvolt-0.5.0 against master#2fd6efc32704647e64d3d646d21c4c68eae100e4 for pr-149852-1
[INFO] extracting crate ruvolt 0.5.0 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate ruvolt 0.5.0
[INFO] finished tweaking crates.io crate ruvolt 0.5.0
[INFO] tweaked toml for crates.io crate ruvolt 0.5.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate ruvolt 0.5.0 on toolchain 2fd6efc32704647e64d3d646d21c4c68eae100e4
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2fd6efc32704647e64d3d646d21c4c68eae100e4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate ruvolt 0.5.0 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" "+2fd6efc32704647e64d3d646d21c4c68eae100e4" "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] warning: failed to write cache, path: /workspace/cargo-home/registry/index/index.crates.io-1949cf8c6b5b557f/.cache/as/yn/async-trait, error: No space left on device (os error 28)
[INFO] [stderr] error: failed to select a version for the requirement `tokio = "^1.17"` (locked to 1.17.0)
[INFO] [stderr] candidate versions found which didn't match: 0.3.3, 0.3.2, 0.3.1, ...
[INFO] [stderr] location searched: crates.io index
[INFO] [stderr] required by package `ruvolt v0.5.0 (/workspace/builds/worker-6-tc1/source)`
[INFO] [stderr] if you are looking for the prerelease package it needs to be specified explicitly
[INFO] [stderr]     tokio = { version = "0.2.0-alpha.6" }


command failed: exit status: 101

    Blocking waiting for file lock on package cache
    Updating crates.io index
warning: failed to write cache, path: /workspace/cargo-home/registry/index/index.crates.io-1949cf8c6b5b557f/.cache/as/yn/async-trait, error: No space left on device (os error 28)
error: failed to select a version for the requirement `tokio = "^1.17"` (locked to 1.17.0)
candidate versions found which didn't match: 0.3.3, 0.3.2, 0.3.1, ...
location searched: crates.io index
required by package `ruvolt v0.5.0 (/workspace/builds/worker-6-tc1/source)`
if you are looking for the prerelease package it needs to be specified explicitly
    tokio = { version = "0.2.0-alpha.6" }