ES6 getter/setter with arrow function

According to the ES2015 grammar, a property on an object literal can only be one of three things:

PropertyDefinition:

• IdentifierReference
• PropertyName : AssignmentExpression
• MethodDefinition

The only one of these type that allows a leading get is MethodDefinition:

MethodDefinition :

• PropertyName ( StrictFormalParameters ) { FunctionBody }
• GeneratorMethod
• get PropertyName ( ) { FunctionBody }
• set PropertyName ( PropertySetParameterList ) { FunctionBody }

As you can see, the get form follows a very limited grammar that must be of the form

get NAME () { BODY }

The grammar does not allow functions of the form get NAME = ....