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> IB> All languages have an internal representation -- a parse tree, > IB> Java bytecodes, machine code, strings, or in Scheme's case, lists > IB> and symbols (this may not be the case with every Scheme > IB> implementation, but they hide that fact). Why is Pliant's > IB> internal representation more neutral than Scheme's? > >Don't confuse languages with implementations. Scheme has no `internal >representation' per se. I guess I'd mean that at certain points there's a representation which is made available to the outside. In the case of Scheme there's the ASCII text and the result of a 'read'. The result of a read is similar to a parse tree, which is kind of one step below any syntax. It looks like Pliant makes a few more levels available, primarily to allow optimization. > IB> And from what I can see from the website, Pliant seems to > IB> emphasize efficiency a great deal -- I don't think Guile shares > IB> this emphasis, it is meant as a compliment to more efficient > IB> languages (like C). Pliant seems to have a quite heavy compiling > IB> phase. > >That's why I'm saying that Guile and Pliant can complement one another. In what way were you thinking? >As to your comments about debugging, I encourage you to read the >documents on error handling. Pliant's low-level error mechanisms can >implement all sorts of crazy things like throw and catch. I didn't read through much about the finer points of Pliant, just the design document (I can't remember the name). The problem I see is a matter of perspective. I guess I don't like the Algol family of languages and the things that they emphasize -- Correctness and speed above high-level features like GC, debugging, and rich libraries. Pliant seems to be a reaction to C and C++ -- and while it's definately a move in the right direction from those languages it takes on the same assumptions that they do. So while debugging may be possible, I wonder if there's the will to make it really happen.