rascal | Rascal meta-programming language | Parser library

I am executing a command in Rascal on Windows 10 (some batch file) which in itself works fine:

I'm using the eval function to evaluate an abstract list pattern against a list and it keeps coming up with an Undeclared Variable error. Below is included a small reproducible example.

I'm trying to create an outline for a syntax definition I create in rascal. I've managed to make the various object appear in the outline by simply adding label annotations like recommended in the documentation. However, I would also like to "categorise" these objects so that all the objects of the same type end up under a common collapsible category. Like the way that Rascal's outline is with all the annotations, functions, variables, tests and so on sorted into their own categories. I haven't found anything really in the documentation about it. I've tried applying @Category to the syntax and to the AST, neither really worked

I have this syntax definition

I'm attempting to create a Socket library in Rascal to operate a Java TCP socket class. For this the following basic setup is used: (src)>(Network)>(Socket.java, Socket.rsc) [1]: https://i.stack.imgur.com/a66RS.png

When attempting to import the Network::Socket module into a Rascal Terminal the following error occurs: "Cannot link method Network.Socket because: class not found"

The Rascal module:

When defining a syntax, it is possible to match 1 or more times (+) or 0 or more times (*) similarly to how it is done in regex. However, I have not found in the rascal documentation if it is possible to also match a Symbol a specific amount of times. In regex (and Rascal patterns) this is done with an integer between two curly brackets but this doesn't seem to work for syntax definition. Ideally, I'd want something like:

I want to show the data of table in a form for updating it.

So I'm using this code :

How can I create a set containing a loc, int and string? In the example below it seems my map is converted to the container type ' value'. I would like to use the characteristics of a set; Only one element should be contained in the set and the order does not matter . In the example below the same elements are contained in what I was hoping to be a set.

In java I would use: System.getProperty("os.name") to get Java to return the operating system. Is something similar possible in Rascal? My goal is to write a method to write text files to a folder that works OS-independent. Something like;