[INFO] fetching crate serde_cow 0.1.2...
[INFO] testing serde_cow-0.1.2 against master#ebf0cf75d368c035f4c7e7246d203bd469ee4a51 for pr-137940
[INFO] extracting crate serde_cow 0.1.2 into /workspace/builds/worker-6-tc1/source


unable to download serde_cow version 0.1.2

Caused by:
    0: failed to unpack `serde_cow-0.1.2/src/lib.rs` into `/workspace/builds/worker-6-tc1/source/src/lib.rs`
    1: No space left on device (os error 28)