PyO3 0.9.0 Alpha.1

There are some breaking changes...
But I believe in most cases, you just change this

impl MyClass {
    #[new] 
    fn new(init: &PyRawObject) { 
        init.init(MyClass {});
    }
}

to

impl MyClass {
    #[new]
    fn new() -> Self { 
        MyClass {}
    }
}

and everything works fine.

Please read the guide for detail.

CHANGELOG

Changed

• The blanket implementations for FromPyObject for &T and &mut T are no longer specializable. Implement PyTryFrom for your type to control the behavior of FromPyObject::extract() for your types.
• The implementation for IntoPy<U> for T where U: FromPy<T> is no longer specializable. Control the behavior of this via the implementation of FromPy.
• #[new] does not take PyRawObject and can reutrn Self #683
• Use parking_lot::Mutex instead of spin::Mutex #734

Added

• Implemented IntoIterator for PySet and PyFrozenSet. #716
• PyClass, PyClassShell, PyObjectLayout, PyClassInitializer #683

Fixed

• Clear error indicator when the exception is handled on the Rust side. #719
• Fixed unsoundness of subclassing. #683.

Removed

• PyRef, PyRefMut, PyRawObject #683