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This should be done via the preprocessor
I think your usecase can be implemented using existing language features and functionality (via dynamic allocation of files etc).
So imho introducing pretty questionable functionality into PL/I would not improve the language.
I might have missed something, just my 0.02€,
br johann
But the CSTG will work on the code generated by the pre-processor!
CSTG will not work on output from the pre-processor.
This can easily be done using the pre-processor...