syntax_data: {"ast_node_type":"variable","tokens":[{"end":68,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let body_span = body.source_scopes[OUTERMOST_SOURCE_SCOPE].span;
context_before:     // (RETURNED, POISONED) of the function.
context_after:     let mut variant_source_info: IndexVec<VariantIdx, SourceInfo> = [