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Alan Watson wrote:
Per Bothner wrote:Common Lisp allows a compiler to *assume* / is defined to the standard / operation, unless there is a visible re-definition. Kawa makes more-or-less the same assumpions. I think that is a reasonable default mode for a compiler.Unless the compiler has the ability to see into the future, this assumption can be rather dangerous in an interactive system.
Not very, I believe: Redefining a standard function is not a wise thing to do, and not very common. Moreso: redefining a standard function (or even a non-standard builtin function) in a *different* separately-compiled compilation unit (module) is even more foolish and rare. (I compile most of Kawa's Scheme code with --warn-undefined-variable which is very nice for catching errors, and which encourages proper module imports. It doesn't preclude a typo or otehr error which accidentally matches a predefined function, I concede.)
Can you tell me where in the HyperSpec this behaviour is sanctioned? I had a quick look before posting my last message, but couldn't find it.
I can't find it either. I may have been thinking of: 220.127.116.11 Semantic Constraints A call within a file to a named function that is defined in the same file refers to that function, unless that function has been declared notinline. But I'm sure Common Lisp allows inlining standard function like (+ ...). Otherwise how could you possibly generate good code?
If I recall correctly, one of the advances of Dylan over Common Lisp was that that Dylan modules export names and *values* not whereas Common Lisp packages export names. This helps the compiler reason about the value of imported procedures. Bigloo is able to do this too, I think.
Kawa is similar, I think: A module exports a set of bindings. require-ing the module imports the bindings into the current (lexical) scope. -- --Per Bothner per@xxxxxxxxxxx http://per.bothner.com/