He admits that situations 1-4 are pretty much solved once you have a parse tree. I think situations 5 and 7 are too. My perspective is that the compiler's wor

He admits that situations 1-4 are pretty much solved once you have a parse tree. I think situations 5 and 7 are too. My perspective is that the compiler's work is only just getting started once you have a parse tree. I was hoping for a hint as to what about compilers was so important; if it's just parsing then no news here.