(x) => {foo: bar}

[Gary Guo]

I found that even without shorthand, the object literal can still be ambiguous with block.

```js()=>{  method()  {
  }}
shall it be interpreted as()=>({  method(){    // method body  }})
or 
()=>{  method();  {    // block statement  }}```
This is certainly an ambiguity that cannot be resolved by any transformation, or refinement of syntax. (so does the shorthand {x,y,z}) 		 	   		  
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