code: function(label) {
  			var forkContext = this.forkContext;
  
  			if (!forkContext.reachable) {
  				return;
  			}
  
  			var context = getBreakContext(this, label);
  
  			/* istanbul ignore else: foolproof (syntax error) */
  			if (context) {
  				context.brokenForkContext.add(forkContext.head);
  			}
  
  			forkContext.replaceHead(forkContext.makeUnreachable(-1, -1));
  		}
docs: Makes a path for a `break` statement.
  
  It registers the head segment to a context of `break`.
  It makes new unreachable segment, then it set the head with the segment.
  
  @param {string} label - A label of the break statement.
  @returns {void}