syntax_data: {"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"PatKind::Variant"}]}
source_snippet:             PatKind::Variant { adt_def, variant_index, args, ref subpatterns } => {
context_after:                 let downcast_place = place_builder.downcast(adt_def, variant_index); // `(x as Variant)`