You are using a function that uses the pretty-xexpr/c contract that exists so the Web Server can display those beautiful errors for users who are learning xexprs.
Jay On Mon, Jun 7, 2010 at 11:12 PM, Eli Barzilay <eli at barzilay.org> wrote: > I just ran into some problem that might be in the contract system, or > more likely in the xml collection (or maybe in both). ?I basically ran > some code that I was editing, and got the lovely error message below. > IIUC, it says that xexpr is broken, which is potentially one problem. > It's probably not strict enough about what it accepts, since the > problem was basically due to my code using #<void> as the value of an > attribute. ?But the second problem is this error message shows the > "Context" as a dump of the whole xexpr -- pretty printed across ~4500 > lines. > > > /download/chronology/index.ss: running... > <collects>/xml/private/xexpr.rkt: > ?(file > ? /home/scheme/plt/collects/xml/private/syntax.rkt) > ?broke the contract (-> xexpr? string?) on xexpr->string given to > ?(file > ? /home/scheme/iplt/web/old/common/layout.ss) > ; Not an Xexpr. Expected a string, given #<void> > > Context: > (html > ...126 lines... > ? ? ? ? ((href "http://download.plt-scheme.org/chronology/racket5.0.html";)) > ? ? ? ? (font ((color #<void>)) "Racket" nbsp (tt () "5.0")) > ...4300 lines... > ?"\n")) > > ?=== context === > /home/scheme/plt/collects/racket/contract/private/blame.rkt:54:0: > raise-blame-error > /home/scheme/plt/collects/racket/private/more-scheme.rkt:173:2: > select-handler/no-breaks > /home/scheme/plt/collects/racket/contract/private/arrow.rkt:1434:3 > /home/scheme/iplt/web/old/common/layout.ss:44:0: xexpr->string* > /home/scheme/iplt/web/old/download/chronology/index.ss:66:0: run > /home/scheme/iplt/web/old/common/utils.ss:8:50: run-file > /home/scheme/iplt/web/old/common/build.ss:20:2: for-loop > /home/scheme/iplt/web/old/common/build.ss:20:2: for-loop > /home/scheme/plt/collects/racket/private/map.rkt:45:11: for-each > /home/scheme/iplt/web/old/common/utils.ss:8:50: build > > > -- > ? ? ? ? ?((lambda (x) (x x)) (lambda (x) (x x))) ? ? ? ? ?Eli Barzilay: > ? ? ? ? ? ? ? ? ? ?http://barzilay.org/ ? ? ? ? ? ? ? ? ? Maze is Life! > _________________________________________________ > ?For list-related administrative tasks: > ?http://lists.racket-lang.org/listinfo/dev > -- Jay McCarthy <jay at cs.byu.edu> Assistant Professor / Brigham Young University http://teammccarthy.org/jay "The glory of God is Intelligence" - D&C 93
