[INFO] cloning repository Linesmerrill/hero-api
[INFO] running `"git" "clone" "--bare" "git://github.com/Linesmerrill/hero-api.git" "work/cache/sources/gh/Linesmerrill/hero-api"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/Linesmerrill/hero-api'...
[INFO] running `"git" "clone" "work/cache/sources/gh/Linesmerrill/hero-api" "work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/Linesmerrill/hero-api"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/Linesmerrill/hero-api'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Linesmerrill/hero-api" "work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/Linesmerrill/hero-api"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/Linesmerrill/hero-api'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6212c524a55deafec658e3d83c70b3ba6fc36cac
[INFO] sha for GitHub repo Linesmerrill/hero-api: 6212c524a55deafec658e3d83c70b3ba6fc36cac
[INFO] validating manifest of Linesmerrill/hero-api on toolchain master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Linesmerrill/hero-api on toolchain try#8f81d0bf6baf07b92f1246696722485c4ca0b049
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing Linesmerrill/hero-api
[INFO] finished frobbing Linesmerrill/hero-api
[INFO] frobbed toml for Linesmerrill/hero-api written to work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/Linesmerrill/hero-api/Cargo.toml
[INFO] started frobbing Linesmerrill/hero-api
[INFO] finished frobbing Linesmerrill/hero-api
[INFO] frobbed toml for Linesmerrill/hero-api written to work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/Linesmerrill/hero-api/Cargo.toml
[INFO] crate Linesmerrill/hero-api already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: failed to parse lock file at: /mnt/big/ec2-user/crater/work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/Linesmerrill/hero-api/Cargo.lock
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   package `serde_derive` is specified twice in the lockfile
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed