[INFO] crate zram-generator 0.1.1 is already in cache
[INFO] extracting crate zram-generator 0.1.1 into work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/reg/zram-generator/0.1.1
[INFO] extracting crate zram-generator 0.1.1 into work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/reg/zram-generator/0.1.1
[INFO] validating manifest of zram-generator-0.1.1 on toolchain master#d99a320cba42f661aebfa1293b7b2ec3603dda75
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of zram-generator-0.1.1 on toolchain try#e70472fc501b855c9080f3772432c10fe20b8866
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e70472fc501b855c9080f3772432c10fe20b8866-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing zram-generator-0.1.1
[INFO] finished frobbing zram-generator-0.1.1
[INFO] frobbed toml for zram-generator-0.1.1 written to work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/reg/zram-generator/0.1.1/Cargo.toml
[INFO] started frobbing zram-generator-0.1.1
[INFO] finished frobbing zram-generator-0.1.1
[INFO] frobbed toml for zram-generator-0.1.1 written to work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/reg/zram-generator/0.1.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr] error: failed to load source for a dependency on `failure`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update registry `https://github.com/rust-lang/crates.io-index`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to update replaced source registry `https://github.com/rust-lang/crates.io-index`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to read root of directory source: /usr/share/cargo/registry
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   No such file or directory (os error 2)
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` failed