syntax_data: {"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // Don't report arm reachability of desugared `match $iter.into_iter() { iter => .. }`
context_before:         match source {
context_after:             // when the iterator is an uninhabited type. unreachable_code will trigger instead.