- reset file pointers after evaluating arguments in __fb_query_symbol__, __fb_eval__, __fb_arg_extract__, __fb_iif__
- Some fbc built in macros like create a separate lexer context to evaluate arguments at compile time.
- When the lexer context is no longer needed, the previous lexer context needs to be restored.
- fbc was failing to correctly restore file pointers after freeing the context
- this would result in the file pointers being not synchronized with the memory buffers and memory pointers
- this would happen when the macros and arguments to be expanded sit on either side of an 8Kb boundary
- 8KB is the hard coded buffer size for reading in chunks of source code