GNU integer `_Complex` panics in `build_builtin_ty` (`Non floating-type complex`)

Input C/C++ Header

int _Complex add(int _Complex a, int t);

Bindgen Invocation

$ bindgen input.h -- -std=gnu11

Actual Results

bindgen aborts. Clang accepts GNU integer _Complex (extension, not ISO C). The panic is in build_builtin_ty: CXType_Complex is handled, but the element type match only allows floating kinds.

panicked at bindgen/ir/context.rs:2047:26:
Non floating-type complex? Type(_Complex int, kind: Complex, ...), Type(int, kind: Int, ...)
panic in a function that cannot unwind
thread caused non-unwinding panic. aborting.

The same abort happens for short / unsigned / long _Complex, for a global extern int _Complex G, and for a struct field. _Float16 _Complex no longer panics (that was #2500).

Expected Results

Do not abort. Skip the declaration, emit an opaque blob, or diagnose that integer _Complex is unsupported.

Environment

bindgen: 0.72.1 and 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 at bindgen/ir/context.rs:2047 and reproduce the issue with the shown input.h and bindgen invocation. Inspect the CXType_Complex handling and its element-type match, then verify that integer _Complex declarations no longer abort and instead receive an explicit supported or diagnostic outcome.