Function Rf_charIsASCII_unchecked 

pub unsafe extern "C-unwind" fn Rf_charIsASCII_unchecked(
    x: SEXP,
) -> Rboolean

Unchecked FFI binding for Rf_charIsASCII. Generated from source location line 328, column 12. Generated from source file miniextendr-api/src/sys.rs.