2.1.102 [ECMA-262/6] Section 21.2.5.10 get RegExp.prototype.source

V0143: RegExp.prototype.source is a data property, not an accessor property

The specification states:

 21.2.5.10 get RegExp.prototype.source
  
 RegExp.prototype.source is an accessor property whose set accessor function is undefined. 
 ...

IE11 Mode (All versions)

RegExp.prototype.source is a data property, not an accessor property. It has the following attributes:

    {[[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: false}