Re: [Chicken-hackers] [PATCH] Restore row and column counting for ports (fixes #978)

[Jim Ursetto]

On Mar 28, 2013, at 3:48 AM, Moritz Heidkamp wrote:

> Jim Ursetto <address@hidden> writes:
>> Unfortunately, I think it is essentially impossible at this time to
>> have the compiler do this automatically via type analysis.  I believe
>> it is possible to get the compiler to treat string ports, for example,
>> as a separate type and specialize on that.  However, once you do this,
>> you cannot use the existing procedures (such as close-input-port)
>> which specialize on plain input-ports and output-ports, as there's no
>> way to say that a particular type (string-input-port) is derived from
>> another type (input-port) and is valid in lieu of the base type.
> 
> Doesn't (define-type string-input-port input-port) work here?

My understanding is that defines a type alias and so you won't
be able to generate code targeted only at string-input-port
in that case.

Jim