syntax_data: {"ast_node_type":"other","tokens":[{"end":35,"kind":"keyword","start":0,"text":"ExprKind::Tuple"}]}
source_snippet:         ExprKind::Tuple { .. } => {
context_before:         }
context_after:             maybe_supported_error(GenericConstantTooComplexSub::TupleNotSupported(node.span))?