Is Delphi the only surviving Pascal? Why is the name "pas", not "pascal"
or even "delphi-pascal"?
No, but all surviving Pascals pretty much support the same syntax, so
when I say Pascal/Delphi, I mean either one. And Delphi does use the
.pas extension.
The keys are not file extensions ("ruby" example did the right thing by
not saying "rb").