syntax_data: {"ast_node_type":"variable","tokens":[{"end":68,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                         let variant_def = &def.variant(variant_idx);
context_before:                             contents.variant.expect("destructed const of adt without variant idx");
context_after:                         self.print_value_path(variant_def.def_id, args)?;