syntax_data: {"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"Some(SymbolManglingVersion::Legacy)"}]}
source_snippet:             Some(SymbolManglingVersion::Legacy) => {
context_before:             None => cg.symbol_mangling_version = Some(SymbolManglingVersion::V0),
context_after:                 early_dcx.early_warn(