[INFO] cloning repository RustPython/RustPython
[INFO] running `"git" "clone" "--bare" "git://github.com/RustPython/RustPython.git" "work/cache/sources/gh/RustPython/RustPython"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/RustPython/RustPython'...
[INFO] running `"git" "clone" "work/cache/sources/gh/RustPython/RustPython" "work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/RustPython/RustPython"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/RustPython/RustPython'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/RustPython/RustPython" "work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/RustPython/RustPython"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/RustPython/RustPython'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b23b8e2904cd0dc5c03391974a0c0a27cc712561
[INFO] sha for GitHub repo RustPython/RustPython: b23b8e2904cd0dc5c03391974a0c0a27cc712561
[INFO] validating manifest of RustPython/RustPython 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 RustPython/RustPython 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 RustPython/RustPython
[INFO] removed workspace from RustPython/RustPython
[INFO] removed path dependency rustpython-compiler from RustPython/RustPython
[INFO] removed path dependency rustpython-parser from RustPython/RustPython
[INFO] removed path dependency rustpython-vm from RustPython/RustPython
[INFO] finished frobbing RustPython/RustPython
[INFO] frobbed toml for RustPython/RustPython written to work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/RustPython/RustPython/Cargo.toml
[INFO] started frobbing RustPython/RustPython
[INFO] removed workspace from RustPython/RustPython
[INFO] removed path dependency rustpython-compiler from RustPython/RustPython
[INFO] removed path dependency rustpython-parser from RustPython/RustPython
[INFO] removed path dependency rustpython-vm from RustPython/RustPython
[INFO] finished frobbing RustPython/RustPython
[INFO] frobbed toml for RustPython/RustPython written to work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/RustPython/RustPython/Cargo.toml
[INFO] crate RustPython/RustPython 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]     Updating crates.io index
[INFO] [stderr] error: failed to select a version for `rustpython-vm`.
[INFO] [stderr]     ... required by package `rustpython v0.1.0 (/mnt/big/ec2-user/crater/work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/RustPython/RustPython)`
[INFO] [stderr] versions that meet the requirements `^0.1.0` are: 0.1.0
[INFO] [stderr] 
[INFO] [stderr] the package `rustpython` depends on `rustpython-vm`, with features: `flame-it, use-proc-macro-hack` but `rustpython-vm` does not have these features.
[INFO] [stderr] 
[INFO] [stderr] 
[INFO] [stderr] failed to select a version for `rustpython-vm` which could resolve this conflict
[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