[INFO] updating cached repository Bert-Proesmans/syn-issue
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Bert-Proesmans/syn-issue
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Bert-Proesmans/syn-issue" "work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/Bert-Proesmans/syn-issue"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/Bert-Proesmans/syn-issue'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Bert-Proesmans/syn-issue" "work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/Bert-Proesmans/syn-issue"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/Bert-Proesmans/syn-issue'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e72b592c0128d8be110cafafa2aee637c056fea2
[INFO] sha for GitHub repo Bert-Proesmans/syn-issue: e72b592c0128d8be110cafafa2aee637c056fea2
[INFO] validating manifest of Bert-Proesmans/syn-issue on toolchain master#60960a260f7b5c695fd0717311d72ce62dd4eb43
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Bert-Proesmans/syn-issue on toolchain try#266783e4e09e4e9d5307c1c8e695659c58bbcac7
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing Bert-Proesmans/syn-issue
[INFO] removed path dependency proc_macro from Bert-Proesmans/syn-issue
[INFO] finished frobbing Bert-Proesmans/syn-issue
[INFO] frobbed toml for Bert-Proesmans/syn-issue written to work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/Bert-Proesmans/syn-issue/Cargo.toml
[INFO] started frobbing Bert-Proesmans/syn-issue
[INFO] removed path dependency proc_macro from Bert-Proesmans/syn-issue
[INFO] finished frobbing Bert-Proesmans/syn-issue
[INFO] frobbed toml for Bert-Proesmans/syn-issue written to work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/Bert-Proesmans/syn-issue/Cargo.toml
[INFO] crate Bert-Proesmans/syn-issue already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: no matching package named `proc_macro` found
[INFO] [stderr] location searched: registry `https://github.com/rust-lang/crates.io-index`
[INFO] [stderr] required by package `syn_issue v0.1.0 (/mnt/big/crater/work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/Bert-Proesmans/syn-issue)`
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed