syntax_data: {"ast_node_type":"import","tokens":[{"end":90,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // We never want to insert an unwind into unsafe code, because unwinding could
context_before:             // This calls panic_invalid_enum_construction, which is #[rustc_nounwind].
context_after:             // make a failing UB check turn into much worse UB when we start unwinding.