Incorrect SOQL parsing

I have the following code, utilizing a custom object Location__c with a geocoordinate field called Coordinates__c and with a related custom object called Site__c with a name, along with a latitude/longitude pair and a value for a maximum great circle distance:

Location touchLocation = Location.newInstance(latitude, longitude);
List<Location__c> locations = [ // CRUD/FLS False Positive: Location matching must take place regardless of user permissions
        SELECT Id, Name, Site__c, Site__r.Name
                FROM Location__c
                WHERE DISTANCE(Coordinates__c, :touchLocation, 'km') < :maxDistance
        ORDER BY DISTANCE(Coordinates__c, :touchLocation, 'km')
        ASC LIMIT 1
];

The following errors are reported by IC2 but not by Salesforce:

<sobject field name> or GEOLOCATION expected, got ':'

ALL, FOR, GROUP, HAVING, LIMIT, OFFSET, ORDER, UPDATE or WITH expected, got ')'

The editor looks like:

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