[INFO] crate futures-test-preview 0.3.0-alpha.13 is already in cache
[INFO] extracting crate futures-test-preview 0.3.0-alpha.13 into work/ex/pr-60932/sources/master#548add7f61bfcbe3bea3f5ccefb53c84da8fefe4/reg/futures-test-preview/0.3.0-alpha.13
[ERROR] this task or one of its parent failed!
[ERROR] unable to download futures-test-preview version 0.3.0-alpha.13
[ERROR] caused by: failed to unpack `futures-test-preview-0.3.0-alpha.13/src/lib.rs` into `work/ex/pr-60932/sources/master#548add7f61bfcbe3bea3f5ccefb53c84da8fefe4/reg/futures-test-preview/0.3.0-alpha.13/src/lib.rs`
[ERROR]