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[roonwhit]

While it appears that, e.g., the F77 standard does not permit X = Y+-Z, most compilers I have used over the years (LF, MS, CVF, DVF, IVF) have been able to handle this correctly as X = Y + (-Z). I am surprised that FTN95 fails such a simple interpretation with errors 441 or 565, depending on whether the cope is on a single line or is continued onto the next.