fn append_attrs_and_stream_as_token_trees_to(
attrs: &[Attribute],
target_tokens: &LazyTokenStream,
configure: &mut (dyn FnMut(&mut AttrsTarget) -> bool + '_),
res: &mut Vec<TokenTree>,
)fn append_attrs_and_stream_as_token_trees_to(
attrs: &[Attribute],
target_tokens: &LazyTokenStream,
configure: &mut (dyn FnMut(&mut AttrsTarget) -> bool + '_),
res: &mut Vec<TokenTree>,
)