ObjC C-style extra parameters panic (assert_eq on selector arity)

Input C/C++ Header

__attribute__((objc_root_class))
@interface Foo
- (int)take:(int)t, int extra;
@end

Bindgen Invocation

$ bindgen input.h -- -x objective-c

Actual Results

clang accepts the header with -Wdeprecated-declarations ("use of C-style parameters in Objective-C method declarations is deprecated"). The selector is still take:; libclang reports two ParmDecls.

bindgen aborts:

panicked at bindgen/ir/objc.rs:297:9:
assertion `left == right` failed: Incorrect method name or arguments for objc method
  left: 2
 right: 1

format_method_call assumes args.len() == selector.split(':').len() - 1. Extra C-style parameters after a comma are in the clang parameter list but not in the selector.

- (int)take:(int)t; does not panic. The #1703 empty-keyword form - (int)take:(int)a :(int)b; also does not panic anymore.

Expected Results

Do not abort. Either emit the extra parameter on the generated method or skip the method.

Environment

bindgen: 0.73.1 (rust-lang/rust-bindgen 77cbc723)
clang/libclang: Homebrew clang 21.1.8
rustc: 1.97.1
target: aarch64-apple-darwin
OS: macOS

Start by reproducing the supplied Objective-C header and bindgen invocation, then read bindgen/ir/objc.rs around format_method_call and the assertion at line 297. Confirm that C-style parameters can outnumber selector components; done means the invocation no longer panics and either emits the extra parameter or skips the method.