default value instead of panic in new_with_raw_value

Author: umohr-irs

bitbybit/src/bitenum.rs

@@ -282,9 +282,10 @@ pub(crate) fn bitenum(config: Config, input: &syn::ItemEnum) -> syn::Result<Toke
         true => quote!(Result<Self, #base_type>),
         false => quote!(Self),
     };
+    let last_element = input.variants.iter().last().unwrap().ident.clone();
     let new_default_branch = match non_exhaustive {
         true => quote!(value => Err(value)),
-        false => quote!(_ => unreachable!()),
+        false => quote!(_ => #ok(Self::#last_element)),
     };
     let new_match_branches = input.variants.iter().zip(values).map(|(variant, value)| {
         let cfg_attrs = variant.attrs.iter().filter(|a| conditional_attr(a));