PL/I was my favorite mainframe programming language my last two years as
an undergrad. I liked how it incorporated ideas from FORTRAN, ALGOL, and
COBOL. My student job was to enhance a PL/I package for a History professor.
What language were the PL/I compilers written in?
Wikipedia claims that IBM is still developing a PL/I compiler, which I suppose I have no reason to disbelieve, but I'm very curious as to who is using it and for what purpose.
-Henry