syntax_data: {"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"hir::MatchSource::ForLoopDesugar"}]}
source_snippet:             hir::MatchSource::ForLoopDesugar if arms.len() == 1 => {}
context_before:             // when the iterator is an uninhabited type. unreachable_code will trigger instead.
context_after:             hir::MatchSource::ForLoopDesugar