code: function(node) {
  			this.currentNode = node;
  
  			// Updates the code path due to node's position in its parent node.
  			if (node.parent) {
  				preprocess(this, node);
  			}
  
  			// Updates the code path.
  			// And emits onCodePathStart/onCodePathSegmentStart events.
  			processCodePathToEnter(this, node);
  
  			// Emits node events.
  			this.original.enterNode(node);
  
  			this.currentNode = null;
  		}
docs: Does the process to enter a given AST node.
  This updates state of analysis and calls `enterNode` of the wrapped.
  
  @param {ASTNode} node - A node which is entering.
  @returns {void}