function validate( node ) {
		if (
			node.expression.type === 'CallExpression' &&
			node.expression.callee &&
			node.expression.callee.type === 'Identifier' &&
			node.expression.callee.name === 'require'
		) {
			report( node );
		}
	}
Checks whether the result of a `require` call is assigned.

@private
@param {ASTNode} node - node to examine