[INFO] crate chomp 0.3.1 is already in cache
[INFO] extracting crate chomp 0.3.1 into work/ex/pr-60620-1/sources/master#ef01f29964df207f181bd5bcf236e41372a17273/reg/chomp/0.3.1
[INFO] extracting crate chomp 0.3.1 into work/ex/pr-60620-1/sources/try#a7cff45e655f886da150e206c7acbe984df4ab71/reg/chomp/0.3.1
[INFO] validating manifest of chomp-0.3.1 on toolchain master#ef01f29964df207f181bd5bcf236e41372a17273
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+ef01f29964df207f181bd5bcf236e41372a17273-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of chomp-0.3.1 on toolchain try#a7cff45e655f886da150e206c7acbe984df4ab71
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a7cff45e655f886da150e206c7acbe984df4ab71-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing chomp-0.3.1
[INFO] finished frobbing chomp-0.3.1
[INFO] frobbed toml for chomp-0.3.1 written to work/ex/pr-60620-1/sources/master#ef01f29964df207f181bd5bcf236e41372a17273/reg/chomp/0.3.1/Cargo.toml
[INFO] started frobbing chomp-0.3.1
[INFO] finished frobbing chomp-0.3.1
[INFO] frobbed toml for chomp-0.3.1 written to work/ex/pr-60620-1/sources/try#a7cff45e655f886da150e206c7acbe984df4ab71/reg/chomp/0.3.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+ef01f29964df207f181bd5bcf236e41372a17273-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr] error: failed to select a version for `debugtrace`.
[INFO] [stderr]     ... required by package `chomp v0.3.1 (/mnt/big/crater/work/ex/pr-60620-1/sources/master#ef01f29964df207f181bd5bcf236e41372a17273/reg/chomp/0.3.1)`
[INFO] [stderr] versions that meet the requirements `^0.1.0` are: 0.1.0
[INFO] [stderr] 
[INFO] [stderr] the package `chomp` depends on `debugtrace`, with features: `backtrace` but `debugtrace` does not have these features.
[INFO] [stderr]  It has a required dependency with that name, but only optional dependencies can be used as features.
[INFO] [stderr] 
[INFO] [stderr] 
[INFO] [stderr] failed to select a version for `debugtrace` which could resolve this conflict
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+ef01f29964df207f181bd5bcf236e41372a17273-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` failed