Re: [racket-dev] relationship between define-struct and struct
I've fixed `define-struct' in *SL to omit a reference to the non-existent `struct:' binding, so `struct-out' now works with the definitions. The error message from `struct-out' is also fixed to say binding instead of import. At Sat, 28 Aug 2010 16:15:26 -0600, Jay McCarthy wrote: The student languages have a completely separate implementation of define-struct from Racket. [lang/private/teach.rkt: do-define-struct: line 716 For a reason unknown to me, the struct type descriptor [line 805] returned by make-struct-type does not get defined (although it does check to make sure it could be defined.) [line 931] I'm not entirely sure why this is although I anticipate that is has to do with the fact that such a value has no worth in *SL, because there are no operations on it. Thus it would be very awkward in the docs to say that a thing is defined with define-struct that has no meaning to students. Since struct-out expects this thing to be defined, it errors. It is a bit awkward that the error suggests that it should have been imported, rather than defined in the file. Jay On Sat, Aug 28, 2010 at 1:23 PM, Shriram Krishnamurthi s...@cs.brown.edu wrote: What is the relationship between define-struct and struct in Racket 5.0.1? By define-struct I mean the construct provided in ASL. In my custom language I have (define-struct tv (tag value)) (provide (struct-out tv)) and I get the error struct-out: no import for structure-type identifier in: struct:tv Is this because define-struct suppresses the struct:tv structure-type information? (If so, why?) ((And if so, is there a way to make struct-out work shy of copying the implementation of define-struct and adding/removing the line that hides this?)) Shriram _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev -- Jay McCarthy j...@cs.byu.edu Assistant Professor / Brigham Young University http://teammccarthy.org/jay The glory of God is Intelligence - DC 93 _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
[racket-dev] relationship between define-struct and struct
What is the relationship between define-struct and struct in Racket 5.0.1? By define-struct I mean the construct provided in ASL. In my custom language I have (define-struct tv (tag value)) (provide (struct-out tv)) and I get the error struct-out: no import for structure-type identifier in: struct:tv Is this because define-struct suppresses the struct:tv structure-type information? (If so, why?) ((And if so, is there a way to make struct-out work shy of copying the implementation of define-struct and adding/removing the line that hides this?)) Shriram _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
Re: [racket-dev] relationship between define-struct and struct
On Sat, Aug 28, 2010 at 3:38 PM, Robby Findler ro...@eecs.northwestern.edu wrote: This works fine in #lang racket, eg: #lang racket (define-struct s (a b)) (provide (struct-out s)) I think that ASL's define-struct is not racket's tho, so you'd probably have to read the docs carefully to understand what's different and what it does and why it is not working properly with racket's struct-out. Yes, thank you, you've just repeated my question... _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
Re: [racket-dev] relationship between define-struct and struct
The student languages have a completely separate implementation of define-struct from Racket. [lang/private/teach.rkt: do-define-struct: line 716 For a reason unknown to me, the struct type descriptor [line 805] returned by make-struct-type does not get defined (although it does check to make sure it could be defined.) [line 931] I'm not entirely sure why this is although I anticipate that is has to do with the fact that such a value has no worth in *SL, because there are no operations on it. Thus it would be very awkward in the docs to say that a thing is defined with define-struct that has no meaning to students. Since struct-out expects this thing to be defined, it errors. It is a bit awkward that the error suggests that it should have been imported, rather than defined in the file. Jay On Sat, Aug 28, 2010 at 1:23 PM, Shriram Krishnamurthi s...@cs.brown.edu wrote: What is the relationship between define-struct and struct in Racket 5.0.1? By define-struct I mean the construct provided in ASL. In my custom language I have (define-struct tv (tag value)) (provide (struct-out tv)) and I get the error struct-out: no import for structure-type identifier in: struct:tv Is this because define-struct suppresses the struct:tv structure-type information? (If so, why?) ((And if so, is there a way to make struct-out work shy of copying the implementation of define-struct and adding/removing the line that hides this?)) Shriram _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev -- Jay McCarthy j...@cs.byu.edu Assistant Professor / Brigham Young University http://teammccarthy.org/jay The glory of God is Intelligence - DC 93 _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
