function collectExpressions( node ) {
		var object;
		var alias;

		if (
			node.callee.type === 'MemberExpression' &&
			node.callee.object.name === 'ns' &&
			node.callee.property.name === 'push'
		) {
			object = node.arguments[ 0 ];
			if ( object.type === 'ObjectExpression' ) {
				alias = getAlias( object );
				if ( alias ) {
					expressions.push( node );
				}
			}
		}
	}
Collects all expressions which add a package to a REPL namespace.

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