Unexpected token using arrow notation returning class with "extends"

Hi Buble team!

I found a bug where I am using arrow notation that returns a class having "extends" keyword extending a base class and got an "Unexpected token" error.

The source:

// this produces "Unexpected token" error
const mixin = (Base) =>
    class Test extends Base {
    }

Transpile result:

// this produces "Unexpected token" error
var mixin = function (Base) (function (Base) {
	    { return function Test () {
	      Base.apply(this, arguments);
	    }if ( Base ) Test.__proto__ = Base;
	    Test.prototype = Object.create( Base && Base.prototype );
	    Test.prototype.constructor = Test;

	    

	    return Test;
	  }(; }Base))

As for now, enclosing the arrow notation with bracket "{ class Classname extends Base {} return Classname; }" temporarily resolves the issue.

I hope this helps. Thanks :-)

Diko

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