syntax_data: {"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"Some(\"legacy\")"}]}
source_snippet:             Some("legacy") => Some(SymbolManglingVersion::Legacy),
context_before:         *slot = match v {
context_after:             Some("v0") => Some(SymbolManglingVersion::V0),