ObjectiveC generics are not type erased properly

[jrmuizel]

Input C/C++ Header

@interface Base
@end

@interface NSArray<ObjectType> : Base
-(ObjectType)getit;
@end

Bindgen Invocation

bindgen --objc-extern-crate generics.m -- -x objective-c

Actual Results

/* automatically generated by rust-bindgen */

#[macro_use]
extern crate objc;
#[allow(non_camel_case_types)]
pub type id = *mut objc::runtime::Object;
pub trait Base {}
impl Base for id {}
pub trait Bar {
    unsafe fn getit(self) -> *mut ObjectType;
}
impl Bar for id {
    unsafe fn getit(self) -> *mut ObjectType {
        msg_send!(self, getit)
    }
}

Expected Results

At a minimum we should erase the generics. Even better we could convert them to rust generics.

Proper support for this is needed for running bindgen on the mac system headers.

[emilio]

Objc support is known-WIP. But type-erasing this or generating the generics should be easy, it'd be just a matter of figuring out how clang exposes them on the AST and hooking them up to the rest of template parameter infrastructure we have in src/ir/analysis.