[dalley@localhost RustPython]$ cargo bench
   Compiling rustpython v0.1.2 (/home/dalley/Devel/rustpython-dev/RustPython)
error[E0425]: cannot find function, tuple struct or tuple variant `PyParser_ASTFromStringObject` in crate `python3_sys`
  --> benches/execution.rs:82:32
   |
82 |         let ret = python3_sys::PyParser_ASTFromStringObject(
   |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not found in `python3_sys`

For more information about this error, try `rustc --explain E0425`.
error: could not compile `rustpython` due to previous error