That is actually the R1000's raison d'etre: Rational built a truly semantic IDE, and the result of that is that if you change a line of source-code somewhere i

That is actually the R1000's raison d'etre: Rational built a truly semantic IDE, and the result of that is that if you change a line of source-code somewhere in a huge complicated project, it will know precisely what the consequences of that change are. Ultimately, this allows it often just recompile that single line.