[racket] Typed Racket frustration

Of course, developer time is limited, so I'm always reluctant to post
comments amounting to "it would be nice if someone else did such-and-such
for me ..." In this case I simply don't have the experience with TR to know
where the major breaks with idiomatic Racket occur.

But user time is limited too. In my case, I'm trying to decide whether TR
is a cost-effective upgrade for my Racket program. What I can't figure out
is whether `hash


On Sat, Jan 24, 2015 at 7:13 AM, Robby Findler <robby at eecs.northwestern.edu>
wrote:

> It seems like a small step to start by documenting the ones that
> people trip up against multiple times in our mailing lists.
>
> Robby
>
> On Sat, Jan 24, 2015 at 9:07 AM, Matthias Felleisen
> <matthias at ccs.neu.edu> wrote:
> >
> > On Jan 24, 2015, at 1:43 AM, Matthew Butterick wrote:
> >
> > FWIW, Sam's point that one can't expect every untyped program to work
> > without modification is entirely fair.
> >
> >
> > Correct.
> >
> > But Konrad's point is also fair: if a function like `append` or `hash`
> works
> > differently in TR, then it is, for practical purposes, not the same
> > function, even if it relies on the same code.
> >
> >
> > This statement is too coarse. There are at least two senses in which a TR
> > function f is distinct from an R function:
> >
> > 1. f's type restricts the usability of f to a strict "subset" [in the
> naive
> > set-theoretic sense]. This is most likely due to a weakness of the type
> > system; the language of "theorems" isn't strong enough to express R's
> > intention w/o making the inference rules unsound. [Unlike in the legal
> > world, In PL arguments of 'typedness' must be about truly-guilty or
> > not-guilty. The rulings are completely impartial and uniform, i.e.,
> totally
> > fair.]
> >
> > 2. f's type ___changes___ the meaning of the code. (That's also possible
> but
> > I don't want to fan the argument that Sam and I have about this.)
> >
> >
> > If it would be superfluous to repeat every TR function in the
> documentation,
> > it still could be valuable to document some of the major departures from
> > Racket. I mean, I would read that, for sure ;)
> >
> >
> >
> > Actually it would not be superfluous. We just don't have the manpower but
> > perhaps it's time to tackle this problem (perhaps in a semi-automated
> > manner).
> >
> > -- Matthias
> >
> >
> > ____________________
> >   Racket Users list:
> >   http://lists.racket-lang.org/users
> >
>
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