syntax_data: {"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"ExprKind::Assign"}]}
source_snippet:         ExprKind::Assign { .. } | ExprKind::AssignOp { .. } => {
context_before:         }
context_after:             error(GenericConstantTooComplexSub::AssignNotSupported(node.span))?