[INFO] cloning repository https://github.com/max-block/demo-rust-mongodb
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/max-block/demo-rust-mongodb" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmax-block%2Fdemo-rust-mongodb", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmax-block%2Fdemo-rust-mongodb'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1aae5f89c752d56e98ef2d3217cc6e936b6b4af6
[INFO] testing max-block/demo-rust-mongodb against master#d98a5da813da67eb189387b8ccfb73cf481275d8+rustflags=-Copt-level=3 for pr-138759
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmax-block%2Fdemo-rust-mongodb" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/max-block/demo-rust-mongodb
[INFO] finished tweaking git repo https://github.com/max-block/demo-rust-mongodb
[INFO] tweaked toml for git repo https://github.com/max-block/demo-rust-mongodb written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/max-block/demo-rust-mongodb on toolchain d98a5da813da67eb189387b8ccfb73cf481275d8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/max-block/demo-rust-mongodb 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" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "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/ch/ro/chrono, error: No space left on device (os error 28)
[INFO] [stderr] error: failed to select a version for the requirement `rand = "^0.7.2"` (locked to 0.7.3)
[INFO] [stderr] candidate versions found which didn't match: 0.5.0-pre.1, 0.5.0-pre.0, 0.4.2, ...
[INFO] [stderr] location searched: crates.io index
[INFO] [stderr] required by package `mongodb v1.1.1`
[INFO] [stderr]     ... which satisfies dependency `mongodb = "^1.1.1"` (locked to 1.1.1) of package `demo-rust-mongodb v0.1.0 (/workspace/builds/worker-2-tc1/source)`
[INFO] [stderr] if you are looking for the prerelease package it needs to be specified explicitly
[INFO] [stderr]     rand = { version = "0.5.0-pre.1" }


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/ch/ro/chrono, error: No space left on device (os error 28)
error: failed to select a version for the requirement `rand = "^0.7.2"` (locked to 0.7.3)
candidate versions found which didn't match: 0.5.0-pre.1, 0.5.0-pre.0, 0.4.2, ...
location searched: crates.io index
required by package `mongodb v1.1.1`
    ... which satisfies dependency `mongodb = "^1.1.1"` (locked to 1.1.1) of package `demo-rust-mongodb v0.1.0 (/workspace/builds/worker-2-tc1/source)`
if you are looking for the prerelease package it needs to be specified explicitly
    rand = { version = "0.5.0-pre.1" }