Compilation fails when using PyO3's `multiple-pymethods` feature

[prehner]

The current version of numpy (0.16.0) does not compile any more if the multiple-pymethods feature of PyO3 is active.

Running

cargo build --release --features "pyo3/multiple-pymethods"

results in

error[E0046]: not all trait items implemented, missing: `Inventory`
  --> src/slice_container.rs:94:1
   |
94 | impl PyClassImpl for PySliceContainer {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `Inventory` in implementation
   |
   = help: implement the missing item: `type Inventory = Type;`

[davidhewitt]

See also PyO3/pyo3#2210 - would welcome your opinion as an active user of this feature.

[adamreichold]

0.16.1 should be available on crates.io now containing the fix for this.