factor % ./Hello\ world/hello-ui The die word was called by the library. Unless you called it yourself, you have triggered a bug in Factor. Please report. Starting low level debugger... Basic commands: q -- continue executing Factor - NOT SAFE im -- save image to fep.image x -- exit Factor Advanced commands: d -- dump memory u -- dump object at tagged . -- print object at tagged t -- toggle output trimming s r -- dump data, retain stacks .s .r .c -- print data, retain, call stacks e -- dump environment g -- dump generations data -- data heap dump words -- words dump tuples -- tuples dump refs -- find data heap references to object push -- push object on data stack - NOT SAFE code -- code heap dump READY .c ==== CALL STACK: frame: 7f7c90478fc8 executing: kernel.private:c-to-factor scan: -1 word/quot addr: 7f7c83951c6c word/quot xt: 7f7c7f439f40 return address: 7f7c7f439f6e frame: 7f7c90478fa8 executing: [ init:boot T{ hashtables:hashtable 0 0 { T{ hashtables.private:tombstone f } T{ hashtables.private:tombstone f } T{ hashtables.private:tombstone f } T{ hashtables.private:tombstone f } T{ hashtables.private:tombstone f } T{ hashtables.private:tombstone f } T{ hashtables.private:tombstone f } T{ hashtables.private:tombstone f } } } kernel:clone alien.private:callbacks namespaces:set-global T{ hashtables:hashtable 0 0 { T{ hashtables.private:tombstone f } T{ hashtables.private:tombstone f } T{ hashtables.private:tombstone f } T{ hashtables.private:tombstone f } T{ hashtables.private:tombstone f } T{ hashtables.private:tombstone f } T{ hashtables.private:tombstone f } T{ hashtables.private:tombstone f } } } kernel:clone destructors:disposables namespaces:set-global T{ vectors:vector { } 0 }... ] scan: 72 word/quot addr: 7f7c83b95774 word/quot xt: 7f7c7f544660 return address: 7f7c7f5448a1 frame: 7f7c90478f88 executing: gtk-ui-backend=>(with-ui) scan: f word/quot addr: 7f7c83b6df6c word/quot xt: 7f7c7f52a9c0 return address: 7f7c7f52ad3b frame: 7f7c90478f68 executing: continuations:rethrow scan: f word/quot addr: 7f7c83943f5c word/quot xt: 7f7c7f428d50 return address: 7f7c7f428dce frame: 7f7c90478f48 executing: kernel:die scan: -1 word/quot addr: 7f7c8396da9c word/quot xt: 7f7c7f439a30 return address: 7f7c7f439a6b READY .r ==== RETAIN STACK: READY .s ==== DATA STACK: T{ kernel:compose [ ui.private:init-ui ] T{ kernel:compose T{ kernel:compose [ f ] T{ kernel:curry T{ ui.gadgets.worlds:world-attributes ui.gadgets.worlds:world f "Hi" f f { ui.pixel-formats:windowed ui.pixel-formats:double-buffered } { ui.gadgets.worlds:normal-title-bar ui.gadgets.worlds:close-button ui.gadgets.worlds:minimize-button ui.gadgets.worlds:maximize-button ui.gadgets.worlds:resize-handles } f } [ kernel:clone ] } } T{ kernel:compose [ "Hello world" ui.gadgets.labels: