[INFO] updating cached repository matklad/mandelbrot
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/matklad/mandelbrot
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/matklad/mandelbrot" "work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/matklad/mandelbrot"`
[INFO] [stderr] Cloning into 'work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/matklad/mandelbrot'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/matklad/mandelbrot" "work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/matklad/mandelbrot"`
[INFO] [stderr] Cloning into 'work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/matklad/mandelbrot'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b373a6009a4878ebdfc1e85b6a43e9150c40140e
[INFO] sha for GitHub repo matklad/mandelbrot: b373a6009a4878ebdfc1e85b6a43e9150c40140e
[INFO] validating manifest of matklad/mandelbrot on toolchain master#5f9c0448dde167128d668da4555879f64e56af1d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of matklad/mandelbrot on toolchain try#8ec8125bea94852768b56958f05da47666c21ab0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing matklad/mandelbrot
[INFO] finished frobbing matklad/mandelbrot
[INFO] frobbed toml for matklad/mandelbrot written to work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/matklad/mandelbrot/Cargo.toml
[INFO] started frobbing matklad/mandelbrot
[INFO] finished frobbing matklad/mandelbrot
[INFO] frobbed toml for matklad/mandelbrot written to work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/matklad/mandelbrot/Cargo.toml
[INFO] crate matklad/mandelbrot already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] error: no matching package named `imgui-sys` found
[INFO] [stderr] location searched: https://github.com/Gekkio/imgui-rs#c4a3605f
[INFO] [stderr] perhaps you meant: imgui-sys
[INFO] [stderr] required by package `imgui v0.0.5-pre (https://github.com/Gekkio/imgui-rs#c4a3605f)`
[INFO] [stderr]     ... which is depended on by `mandelbrot v0.1.0 (/mnt/big/crater/work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/matklad/mandelbrot)`
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed