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libclang's API does not provide a straightforward way to check for
this, and calling clang_getFieldDeclBitWidth is actively unsafe in
this case. See https://github.com/llvm/llvm-project/issues/56644
We probably can't generate reasonable bindings for such a type, so
make the binding opaque.
Ideally libclang would report if the bit width could not be
evaluated. Unfortunately making such a change would mean bumping the
minimum libclang version from 6.0 to 15.0.
Instead, add logic to traverse the AST subtree starting from the
field's bit width specifier looking for template parameters. If we
find one, we make the resulting type opaque.
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