On 23/03/2008, at 12:40 PM, Erick Tryzelaar wrote: > I was asked by someone in #llvm if felix can do polymorphic recursion, > and I wasn't sure if we could.
Nope, Felix doesn't have second order polymorphic functions so you can't even talk about polymorphic recursion. If you do fun f[t] (x:t, g:t->t):t => g(t); really g isn't polymorphic at all .. the 't' in it is fixed by f. EG: f (1,g) // f[int], g[int] Roughly, Felix only allows outermost universal quantification.. the lambda binder on the type "t" is only allowed to be universal over the whole function f, you can't do lambda t . f : t * (lambda v. v->v) -> t for example (that v->v is keeping the lambda *inside* so the function is polymorphic *inside f.) ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Felix-language mailing list Felix-language@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/felix-language