syntax_data: {"ast_node_type":"function","tokens":[{"end":65,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn collect_and_apply<I, F>(mut iter: I, f: F) -> Result<R, E>
context_before:     /// Equivalent to `Ok(f(&iter.collect::<Result<Vec<_>>>()?))`.
context_after:     where