function sortExpressions( a, b ) {
		var aliasA = getAlias( a.arguments[ 0 ] );
		var aliasB = getAlias( b.arguments[ 0 ] );
		return aliasA.localeCompare( aliasB, 'en', OPTS_COMPARE );
	}
Compares two nodes and determines their order based on the alias property.

@private
@param {ASTNode} a - first node
@param {ASTNode} b - second node
@returns {number} number indicating sort order