rust-bindgen: "invalid identifier" when clang targets obj-c

Input Obj-C Header

//
//  HapticIFace.h
//  rusttest
//
//  Created by user on 4/6/23.
//

#ifndef HapticIFace_h
#define HapticIFace_h

#import <CoreHaptics/CoreHaptics.h>

@interface HapticIFace : NSObject       {
}

@property (nonatomic, strong) CHHapticEngine* engine;

@end

#endif /* HapticIFace_h */

This is here as a placeholder since it was the last file I tried. Any file causes this error.

Bindgen Invocation

bindgen ./HapticIFace.h -- -target arm64-apple-ios -x objective-c -isysroot /Users/user/Downloads/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk

Actual Results

panicked at 'Invalid identifier: Error("expected identifier")', /Users/user/.cargo/registry/src/github.com-x/bindgen-0.64.0/ir/objc.rs:272:30

Expected Results

Unknown

===

This error happens on all files I use w/ objective-c.

I mistakenly attached this onto issue #2029. There, I’d used a premade command courtesy of @.simlay: https://simlay.net/posts/rust-bindgen-objc-support/#adding-a-build-rs . I modified it to the correct paths for my usecase and ran that build.rs using cargo and had the same issue.

Importantly, if I put a random file in, it goes through that file and obviously detects syntax errors. Perhaps the issue happening here comes after the file is processed? I ran with RUST_BACKTRACE=1 and there was no difference in the error message, and I also am currently running with RUST_LOG=bindgen. It’s been going for about fifteen minutes but it’s getting slower as more stuff gets printed. It’s definitely working with the code given, so I think whatever the issue is is happening after the ir is generated.