{ "type": "File", "start":0,"end":41,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}}, "errors": [ "SyntaxError: Yield expression is not allowed in formal parameters. (2:8)" ], "program": { "type": "Program", "start":0,"end":41,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}}, "sourceType": "script", "interpreter": null, "body": [ { "type": "FunctionDeclaration", "start":0,"end":41,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}}, "id": { "type": "Identifier", "start":10,"end":12,"loc":{"start":{"line":1,"column":10},"end":{"line":1,"column":12},"identifierName":"fn"}, "name": "fn" }, "generator": true, "async": false, "params": [], "body": { "type": "BlockStatement", "start":15,"end":41,"loc":{"start":{"line":1,"column":15},"end":{"line":3,"column":1}}, "body": [ { "type": "ExpressionStatement", "start":19,"end":39,"loc":{"start":{"line":2,"column":2},"end":{"line":2,"column":22}}, "expression": { "type": "ArrowFunctionExpression", "start":19,"end":38,"loc":{"start":{"line":2,"column":2},"end":{"line":2,"column":21}}, "id": null, "generator": false, "async": false, "params": [ { "type": "AssignmentPattern", "start":20,"end":31,"loc":{"start":{"line":2,"column":3},"end":{"line":2,"column":14}}, "left": { "type": "Identifier", "start":20,"end":21,"loc":{"start":{"line":2,"column":3},"end":{"line":2,"column":4},"identifierName":"x"}, "name": "x" }, "right": { "type": "YieldExpression", "start":25,"end":30,"loc":{"start":{"line":2,"column":8},"end":{"line":2,"column":13}}, "extra": { "parenthesized": true, "parenStart": 24 }, "delegate": false, "argument": null } } ], "body": { "type": "BlockStatement", "start":36,"end":38,"loc":{"start":{"line":2,"column":19},"end":{"line":2,"column":21}}, "body": [], "directives": [] } } } ], "directives": [] } } ], "directives": [] } }