code: function enterFunction(node) {
  			scopeInfo = {
  				isBound: isCalleeOfBindMethod(node),
  				thisFound: false,
  				upper: scopeInfo
  			};
  		}
docs: Adds a scope information object to the stack.
  
  @param {ASTNode} node - A node to add. This node is a FunctionExpression
  or a FunctionDeclaration node.
  @returns {void}