Function blocks_to_string 

pub fn blocks_to_string<'ast, BIter, B, S, F>(
    blks: BIter,
    single_indent: &str,
) -> String
where
    BIter: IntoIterator<Item = B>,
    B: IntoUnindented<Output = View<'ast, S, F>> + 'ast,
    S: 'ast,
    F: Clone + ViewFn<&'ast S>,
    F::Output: ToString,