This is a simple library providing ParenthesizedC ZST that implements syn::parse::Parse and thus, for example, can be used with syn::parse2() for the purpose of parsing (C) attribute tokens as in #[repr(C)] outer attribute.

Example:

extern crate syn;
extern crate outer_attribute;
extern crate parenthesized_c;

use parenthesized_c::ParenthesizedC;
use outer_attribute::different_layout::OuterAttribute;

fn main() -> syn::Result<()> {
    let repr_c = syn::parse_str::<OuterAttribute>("#[repr(C)]")?;
    let repr_transpartent = syn::parse_str::<OuterAttribute>("#[repr(transparent)]")?;
    assert!(matches!(syn::parse2::<ParenthesizedC>(repr_c.tokens), Ok(_)));
    assert!(matches!(syn::parse2::<ParenthesizedC>(repr_transpartent.tokens), Err(_)));
    Ok(())
}

License