[INFO] cloning repository https://github.com/manuelmauro/rust-backend-stack
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/manuelmauro/rust-backend-stack" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmanuelmauro%2Frust-backend-stack", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmanuelmauro%2Frust-backend-stack'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 16bbd09fcc5ce6a282139addc70aea282d219c76
[INFO] testing manuelmauro/rust-backend-stack 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%2Fmanuelmauro%2Frust-backend-stack" "/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/manuelmauro/rust-backend-stack
[INFO] removed 0 missing tests
[INFO] finished tweaking git repo https://github.com/manuelmauro/rust-backend-stack
[INFO] tweaked toml for git repo https://github.com/manuelmauro/rust-backend-stack written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/manuelmauro/rust-backend-stack 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/manuelmauro/rust-backend-stack 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/an/yh/anyhow, error: No space left on device (os error 28)
[INFO] [stderr] error: failed to select a version for the requirement `serde = "^1.0.159"` (locked to 1.0.159)
[INFO] [stderr] candidate versions found which didn't match: 1.0.24, 1.0.23, 1.0.22, ...
[INFO] [stderr] location searched: crates.io index
[INFO] [stderr] required by package `rust-backend-stack v0.1.0 (/workspace/builds/worker-4-tc1/source)`
[INFO] [stderr] if you are looking for the prerelease package it needs to be specified explicitly
[INFO] [stderr]     serde = { version = "0.9.0-rc4" }


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/an/yh/anyhow, error: No space left on device (os error 28)
error: failed to select a version for the requirement `serde = "^1.0.159"` (locked to 1.0.159)
candidate versions found which didn't match: 1.0.24, 1.0.23, 1.0.22, ...
location searched: crates.io index
required by package `rust-backend-stack v0.1.0 (/workspace/builds/worker-4-tc1/source)`
if you are looking for the prerelease package it needs to be specified explicitly
    serde = { version = "0.9.0-rc4" }