RExpression temp files can collide
There is an as of yet unsubmitted patch that should fix collisions with symbols in record names that are invalid in file names. Specifically, the patch addresses the cases where:
1. 2 ports have names that differ by reserved symbols
2. both ports cannot be converted to native tokens and so are saved to disk and
passed as file names
The problem arises because the committed code converts almost all non-alphanumeric characters to underscores (_) to create valid file names, creating potential collisions. There is some code to avoid this, but it is implemented before files generated by the firing actor ports are processed. In other words, the existing code can only avoid collisions with ports belonging to different actors and not similarly named ports on a single actor.