syntax_data: {"ast_node_type":"other","tokens":[{"end":34,"kind":"keyword","start":0,"text":"PatKind::Variant"}]}
source_snippet:                 PatKind::Variant {
context_before:                 let variant_index = VariantIdx::from_u32(variant_index.unwrap_leaf().to_u32());
context_after:                     adt_def: *adt_def,