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• WinDbg can't find mfc90 version 9.0.30729.4148 symbols on msdl.microsoft.com

  - by Simon Hofverberg

  I think the title states my problem fairly well. Where are those mfc symbols? Some background info: I have a crash dump that I want to analyze in WinDbg. My symbol path contains msdl.microsoft.com/download/symbols (and it says h t t p first but I'm a new user here so I'm not allowed to write that twice. The 9.0.30729.4148 version seems to be installed by some Windows update When a dump contains an earlier version of mfc90, it is located by WinDbg on the Microsoft symbol server with the same settings. When I use !sym noisy, the output for mfc90.dll contains: SYMSRV: http://msdl.microsoft.com/download/symbols/mfc90.dll/4A596D4939c000/mfc90.dll not found The same thing happens on two different computers Edit: See my comments below. The symbols are present on the server, but WinDbg can't get them.

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• Ogg/Vorbis: _ov_fopen cannot be found

  - by knight666

  I'm trying to use Ogg/Vorbis with OpenAL to get sound in my game. Right now I'm simply trying to load a .ogg file and read its data, I'm not actually doing anything with it. I first tried using ov_open, however, the documentation said I should really be using ov_fopen on Windows. However, when I try to use that I get the following: 1>AudioManager.obj : error LNK2019: unresolved external symbol _ov_fopen referenced in function "private: static struct SomeGame::SoundData * __cdecl SomeGame::AudioManager::LoadOGG(char *)" (?LoadOGG@AudioManager@SomeGame@@CAPAUSoundData@2@PAD@Z) ...and when I Google "unresolved external symbol _ov_fopen", I get exactly one result. And it's in Japanese. So I tried downloading the ogg and vorbis source and compiling it, and inserting those in the project, but it still gives me the same error. Basically, how do I load in an Ogg/Vorbis file to be used with OpenAL on Windows? Thanks in advance.

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• C++ EZWindows Linker Errors when trying to run demos

  - by Brent Nash

  I'm attempting to download and use the EZWindows ( http://www.cs.virginia.edu/c++programdesign/software/ ) SPARC installation (the http://www.cs.virginia.edu/c++programdesign/software/EzWindows2a-SPARC.tar.gz file). When trying to build some of the examples that come with it, I'm getting some linker errors that I just can't figure out. Here's the result of the uname -a command on the machine I'm running on (on which I am NOT an administrator): SunOS AAA.BBB.edu 5.10 Generic_138888-07 sun4v sparc SUNW,T5240 And here is the result of the g++ -v command: gcc version 2.95.2 19991024 (release) If you untar/unzip the package, I'm trying to compile the example in samples/chap03/lawn by simply doing "gmake" in that directory, here's what I get. Here's the error I get: bash-3.00$ gtar xfz EzWindows2a-SPARC.tar.gz gtar: Removing leading `./' from member names bash-3.00$ cd chap03/lawn bash-3.00$ gmake clean ; gmake rm -f *.o *~ lawn make lawn g++ -I/X11.6/include -I../../EzWindows/include -c prog3-5.cpp prog3-5.cpp: In function `int ApiMain()': prog3-5.cpp:75: warning: initialization to `long int' from `const float' prog3-5.cpp:85: warning: initialization to `int' from `float' prog3-5.cpp:86: warning: initialization to `int' from `float' g++ -o lawn prog3-5.o -L/X11.6/lib -R/X11.6/lib -lX11 -lsocket -L../../EzWindows/lib -lezwin -lXpm ld: warning: symbol `clog' has differing types: (file /usr/usc/gnu/gcc/2.95.2/lib/gcc-lib/sparc-sun-solaris2.6/2.95.2/libstdc++.so type=OBJT; file /lib/libm.so type=FUNC); /usr/usc/gnu/gcc/2.95.2/lib/gcc-lib/sparc-sun-solaris2.6/2.95.2/libstdc++.so definition taken Undefined first referenced symbol in file __dl__Q2t12basic_string3ZcZt18string_char_traits1ZcZt24__default_alloc_template2b0i03RepPv ../../EzWindows/lib/libezwin.a(WindowManager.o) __eh_pc ../../EzWindows/lib/libezwin.a(WindowManager.o) clone__Q2t12basic_string3ZcZt18string_char_traits1ZcZt24__default_alloc_template2b0i03Rep ../../EzWindows/lib/libezwin.a(WindowManager.o) ld: fatal: Symbol referencing errors. No output written to lawn collect2: ld returned 1 exit status *** Error code 1 make: Fatal error: Command failed for target `lawn' Current working directory /export/samfs-bcf/rcf-11/bnash/sparc/chap03/lawn gmake: *** [default] Error 1 This particular run was built using g++ 2.95.2, but I've also tried with versions 3.3.2 and 4.2.1 with other equally strange errors. I'm pretty sure that EZWindows requires a 2.x version of gcc & g++. I've tried to make sure that my LD_LIBRARY_PATH and PATH are setup to include everything that's needed, but it seems that may be incorrect. I'm running out of ideas. Anyone have any other ones?

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• Link errors loading a Python extension for i386 MacOS that was compiled on a PPC

  - by deekoo

  I'm trying to compile a Python extension (written in C) on a PPC mac (running OS X 10.4, XCode 2.5), to run under Ren'Py on both PPC and i386 MacOS. The PPC version works; the i386 version fails to load with ImportError: dlopen(./fasttint_macos_i386.dylib, 2): Symbol not found: _PyType_GenericNew Referenced from: /Applications/Games/Demos/CuteKnightKingdom-demo-0.9.25.1-mac/CuteKnightKingdom-demo.app/Contents/Resources/autorun/game/fasttint_macos_i386.dylib Expected in: /Applications/Games/Demos/CuteKnightKingdom-demo-0.9.25.1-mac/CuteKnightKingdomdemo.app/Contents/Resources/autorun/game/fasttint_macos_i386.dylib As best I can tell, _PyType_GenericNew should be defined by Ren'Py's python - why is it trying to find an internal declaration for the symbol instead of the external one?

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• mysql C connector unresolved symbols on Win2k8 but not on XP?

  - by jimmy glick

  I have a visual C++ 2008 express project which compiles fine on Windows XP with mysql C connector 6.0.2. When I copy the project over to a Windows Server 2008 x64 machine, it gets a bunch of linker errors like "unresolved external symbol _mysql_server_end@0" "unresolved external symbol _mysql_close@4" "unresolved external _mysql_real_connect@32". Is the mysql C connector 6.0.2 known to not work with Win Server 2008? (Note, the C connector is installed into the same place on both machines, and since I just copied over the project wholesale, it still has the correct libmysql.lib include. The interesting thing is that the errors I get on XP if I remove the libmysql.lib are not the same errors I'm getting on Win2k8, so that's what makes me think it might be an incompatibility...or maybe it's just because win2k8 is x64 and XP is x86?) Thanks

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• Python + PostgreSQL + strange ascii = UTF8 encoding error

  - by Claudiu

  I have ascii strings which contain the character "\x80" to represent the euro symbol: >>> print "\x80" € When inserting string data containing this character into my database, I get: psycopg2.DataError: invalid byte sequence for encoding "UTF8": 0x80 HINT: This error can also happen if the byte sequence does not match the encodi ng expected by the server, which is controlled by "client_encoding". I'm a unicode newbie. How can I convert my strings containing "\x80" to valid UTF-8 containing that same euro symbol? I've tried calling .encode and .decode on various strings, but run into errors: >>> "\x80".encode("utf-8") Traceback (most recent call last): File "<pyshell#14>", line 1, in <module> "\x80".encode("utf-8") UnicodeDecodeError: 'ascii' codec can't decode byte 0x80 in position 0: ordinal not in range(128)

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• How to access Map in JSF

  - by Muneeswaran Balasubramanian

  Hi to all, I have try to access the map in jsf using C:foreach.But i can't access that in jsf by using"#" symbol.But i can access it using "$" symbol.But i need to access to displayed using jsf component h:outputtext.My sample code is h:form binding="#{MapInJsf.initForm}"> <c:forEach items="#{MapInJsf.nameMap}" var="nameMap"> <%--<li>${nameMap.key}</li>--%> I cann access it <%--<h:outputText value="#{nameMap}"/>--%> <h:outputText value="Name2 : #{nameMap.key}"/> <h:outputText value="Last Name1 : #{nameMap.value}"/> </c:forEach> </h:form> what i do wrong and how can i access that?My Ref link is Dynamic value binding of JSF component Please help me.

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• LNK2001: What have I forgotton to set?

  - by graham.reeds

  Following on from my previous question regarding debugging of native code, I decided to create a simple test from a console app as I wasn't getting anywhere with debugging the service directly. So I created a vc6 console app, added the dll project to the workspace and ran it. Instead of executing as expected it spat out the following linker errors: main.obj : error LNK2001: unresolved external symbol "int __stdcall hmDocumentLAdd(char *,char *,long,char *,char *,long,long,long,long *)" (?hmDocumentLAdd@@YGHPAD0J00JJJPAJ@Z) main.obj : error LNK2001: unresolved external symbol "int __stdcall hmGetDocBasePath(char *,long)" (?hmGetDocBasePath@@YGHPADJ@Z) Debug/HazManTest.exe : fatal error LNK1120: 2 unresolved externals This seems to be a simple case of forgetting something in the linker options: However everything seems to be normal, and the lib file, dll and source is available. If I change the lib file to load to nonsense it kicks up the fatal error LNK1104: cannot open file "asdf.lib", so that isn't a problem. I have previously linked to dll and they have just worked, so what I have forgotton to do?

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• Xcode: code loses syntax coloring

  - by ColorMeFamous

  I find that in various situations Objective-C code in Xcode 3.1 (Leopard) can fail to get appropriate syntax coloring after typing or lose coloring that it had. This isn't just a "refresh" issue with new custom symbols -- but affects Cocoa framework symbols as well. Sometimes CMD-a to select all text on the code page will make the coloring (re)appear, sometimes double-clicking on a line to select it will work, sometimes I have to add/delete a space in a symbol to get that symbol to (re)color. Rebuilding, or closing/reopening the project may or may not work. Is this a known issue with Xcode? For something so annoying to me, I'm not finding the plentiful discussions of it on SO and elsewhere I'd expect. And is there any command to force global syntax recoloring?

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• subscript for a join (\bowtie) operation in LyX/LaTeX

  - by Amir Rachum

  I'm using LyX to write some Relational Algebra queries. I'm using the \bowtie symbol for the join operation but when I try to put a text in subscript directly under the symbol, I get the following error: ...a_{\t{pId}}\t{person}\right)\bowtie\limits {\t{pId}{1}=\t{pId}_{2}... I'm ignoring this misplaced \limits or \nolimits command. Anyone knows how to do what I want? Preferably in LyX, but ERT code snippets will also be appreciated. Thanks! Edit: \t is a macro for \text.

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• idiomatic property changed notification in scala?

  - by Jeremy Bell

  I'm trying to find a cleaner alternative (that is idiomatic to Scala) to the kind of thing you see with data-binding in WPF/silverlight data-binding - that is, implementing INotifyPropertyChanged. First, some background: In .Net WPF or silverlight applications, you have the concept of two-way data-binding (that is, binding the value of some element of the UI to a .net property of the DataContext in such a way that changes to the UI element affect the property, and vise versa. One way to enable this is to implement the INotifyPropertyChanged interface in your DataContext. Unfortunately, this introduces a lot of boilerplate code for any property you add to the "ModelView" type. Here is how it might look in Scala: trait IDrawable extends INotifyPropertyChanged { protected var drawOrder : Int = 0 def DrawOrder : Int = drawOrder def DrawOrder_=(value : Int) { if(drawOrder != value) { drawOrder = value OnPropertyChanged("DrawOrder") } } protected var visible : Boolean = true def Visible : Boolean = visible def Visible_=(value: Boolean) = { if(visible != value) { visible = value OnPropertyChanged("Visible") } } def Mutate() : Unit = { if(Visible) { DrawOrder += 1 // Should trigger the PropertyChanged "Event" of INotifyPropertyChanged trait } } } For the sake of space, let's assume the INotifyPropertyChanged type is a trait that manages a list of callbacks of type (AnyRef, String) = Unit, and that OnPropertyChanged is a method that invokes all those callbacks, passing "this" as the AnyRef, and the passed-in String). This would just be an event in C#. You can immediately see the problem: that's a ton of boilerplate code for just two properties. I've always wanted to write something like this instead: trait IDrawable { val Visible = new ObservableProperty[Boolean]('Visible, true) val DrawOrder = new ObservableProperty[Int]('DrawOrder, 0) def Mutate() : Unit = { if(Visible) { DrawOrder += 1 // Should trigger the PropertyChanged "Event" of ObservableProperty class } } } I know that I can easily write it like this, if ObservableProperty[T] has Value/Value_= methods (this is the method I'm using now): trait IDrawable { // on a side note, is there some way to get a Symbol representing the Visible field // on the following line, instead of hard-coding it in the ObservableProperty // constructor? val Visible = new ObservableProperty[Boolean]('Visible, true) val DrawOrder = new ObservableProperty[Int]('DrawOrder, 0) def Mutate() : Unit = { if(Visible.Value) { DrawOrder.Value += 1 } } } // given this implementation of ObservableProperty[T] in my library // note: IEvent, Event, and EventArgs are classes in my library for // handling lists of callbacks - they work similarly to events in C# class PropertyChangedEventArgs(val PropertyName: Symbol) extends EventArgs("") class ObservableProperty[T](val PropertyName: Symbol, private var value: T) { protected val propertyChanged = new Event[PropertyChangedEventArgs] def PropertyChanged: IEvent[PropertyChangedEventArgs] = propertyChanged def Value = value; def Value_=(value: T) { if(this.value != value) { this.value = value propertyChanged(this, new PropertyChangedEventArgs(PropertyName)) } } } But is there any way to implement the first version using implicits or some other feature/idiom of Scala to make ObservableProperty instances function as if they were regular "properties" in scala, without needing to call the Value methods? The only other thing I can think of is something like this, which is more verbose than either of the above two versions, but is still less verbose than the original: trait IDrawable { private val visible = new ObservableProperty[Boolean]('Visible, false) def Visible = visible.Value def Visible_=(value: Boolean): Unit = { visible.Value = value } private val drawOrder = new ObservableProperty[Int]('DrawOrder, 0) def DrawOrder = drawOrder.Value def DrawOrder_=(value: Int): Unit = { drawOrder.Value = value } def Mutate() : Unit = { if(Visible) { DrawOrder += 1 } } }

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• error with gtkmm 3 in ubuntu 12.04

  - by Grohiik

  i install libgtkmm-3.0-dev in ubuntu 12.04 and i try to learn and write program with c++ and gtkmm 3 i go to this link "http://developer.gnome.org/gtkmm-tutorial/unstable/sec-basics-simple-example.html.en" and try to compile simple example program : #include <gtkmm.h> int main(int argc, char *argv[]) { Glib::RefPtr<Gtk::Application> app = Gtk::Application::create(argc, argv, "org.gtkmm.examples.base"); Gtk::ApplicationWindow window; return app->run(window); } my file name is "basic.cc" and i open terminal and type following command to compile: g++ basic.cc -o basic `pkg-config gtkmm-3.0 --cflags --libs` compile completed without any error but when i try to run program with type ./basic in terminal i get following error : ~$ ./simple ./simple: symbol lookup error: ./simple: undefined symbol:_ZN3Gtk11Application6createERiRPPcRKN4Glib7ustringEN3Gio16ApplicationFlagsE ~$ how can i solve this problem ? i can cimpile any gtkmm 2.4 code with this command : " g++ basic.cc -o basic pkg-config gtkmm-3.0 --cflags --libs " and this command : " g++ basic.cc -o basic pkg-config gtkmm-2.4 --cflags --libs " thanks

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• The Definition of Regular Languages

  - by AraK

  Good Day, I have tried, and burned my brain to understand the definition of Regular Languages in Discrete Mathematics and its Applications(Rosen) without reaching the goal of understanding why the definition is like that in this book. On page(789), I am rephrasing the definition: Type 3 grammars are defined as: w1 --> w2 Where w1 is a non-terminal, and w2 is of the form: w2 = aB w2 = a Where B is a non-terminal, and a is a terminal. A special case is when w1 is the starting symbol and w2 is lambda(the empty string): w1 = S S --> lambda Two questions I couldn't find an answer for. First, Why can't w2 be of the form Ba. Second, Why lambda is only allowed for the starting symbol only. The book states that, regular languages are equivalent to Finite State Automaton, and we can easily see that a we can build FSA for both cases. I took a look at other resources, and these restrictions don't exist in these resources. Thanks,

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• Executing a dynamically bound function in Clojure

  - by Carl Smotricz

  I'd like to pre-store a bunch of function calls in a data structure and later evaluate/execute them from within another function. This works as planned for functions defined at namespace level with defn (even though the function definition comes after my creation of the data structure) but will not work with functions defined by let [name (fn or letfn inside the function. Here's my small self-contained example: (def todoA '(funcA)) (def todoB '(funcB)) (def todoC '(funcC)) (def todoD '(funcD)) ; unused (defn funcA [] (println "hello funcA!")) (declare funcB funcC) (defn runit [] (let [funcB (fn [] (println "hello funcB"))] (letfn [(funcC [] (println "hello funcC!"))] (funcA) (eval todoA) ; OK (funcB) ; OK (eval todoB) ; "Unable to resolve symbol: funcB in this context" at line 2 (funcC) ; OK (eval todoC) ; "Unable to resolve symbol: funcC in this context" at line 3 ))) Is there a simple fix I could undertake to get eval'd quoted calls to functions to work for functions defined inside another function?

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• REGEX HELP: SUBDOMAIN CHECK

  - by NoviceCoding

  Hey I have a form where the person enters the subdomain like value.google.com and the entry would be "valid" I want to run a regex check (I am absolutely horrible at regex) that does the following: First Character: Cannot be symbol Middle Characters: a-z, A-Z, and symbols - and . ONLY Last character: Cannot be a symbol I want it to spit out false if it fails the test. Can anyone help me out with this? Thanks! Also any other limitations do you guys think should be in there?

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• Understanding run time code interpretation and execution

  - by Bob

  I'm creating a game in XNA and was thinking of creating my own scripting language (extremely simple mind you). I know there's better ways to go about this (and that I'm reinventing the wheel), but I want the learning experience more than to be productive and fast. When confronted with code at run time, from what I understand, the usual approach is to parse into a machine code or byte code or something else that is actually executable and then execute that, right? But, for instance, when Chrome first came out they said their JavaScript engine was fast because it compiles the JavaScript into machine code. This implies other engines weren't compiling into machine code. I'd prefer not compiling to a lower language, so are there any known modern techniques for parsing and executing code without compiling to low level? Perhaps something like parsing the code into some sort of tree, branching through the tree, and comparing each symbol and calling some function that handles that symbol? (Wild guessing and stabbing in the dark)

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• How to mark empty in a single element in a float array

  - by Vineeth Mohan

  I have a large float (primitive) array and not every element in the array is filled. How can i mark a particular element as EMPTY. I understand this can be achieved by some special symbols but still i would like to know the standard way. Even if i am using some special symbol , how will i handle a situation where the actual data item is the value of special symbol. In short my question is how to implement the NULL feature in a primitive type array in java. PS - The reason why i am not using Float object is to achieve a high memory and speed performance. Thanks Vineeth

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• Using Fortran to call C++ Functions

  - by Dane Larsen

  I'm trying to get some FORTRAN code to call a couple c++ functions that I wrote (c_tabs_ being one of them). Linking and everything works just fine, as long as I'm calling functions that don't belong to a class. My problem is that the functions I want the FORTRAN code to call belong to a class. I looked at the symbol table using nm and the function name is something ugly like this: 00000000 T _ZN9Interface7c_tabs_Ev FORTRAN won't allow me to call a function by that name, because of the underscore at the beginning, so I'm at a loss. The symbol for c_tabs when it's not in a class is quite simple, and FORTRAN has no problems with it: 00000030 T c_tabs_ Any suggestions? Thanks in advance.

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• How do you search for symbols without knowing what they're called?

  - by froadie

  This is a question that's been bothering me for a while, and it's likely that there's no way around it. But I was curious if anyone has any techniques for dealing with this. How do you search on a symbol using a search engine (such as Google or Bing) without knowing the symbol's name...? Most standard search engines seem to ignore symbols... (e.g. @, ^, etc.) Are there any engines that don't? Is there any other way to do this?

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• Integer output in Java method not same as pre-converted char value.

  - by David

  I'm trying to parse a simple text file in an integer method and then output an integer from such file so that other parts of the program can use it. For testing purposes it also displays the character value (9 in this case). The integer value for some reason is 57. I've also tried it with another part of the text file (which in that case should be 5, but is instead 53). After looking at an ASCII chart, I see that 57 is the ASCII version of the "symbol" 9 and that 53 is the ASCII version of the "symbol" 5. Is there any simple way I can fix this? I'm getting kind of frustrated as I'm a Java newbie (I've mostly only used FreePascal before this).

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• Binding a Java Integer to JavaScriptEngine doesn't work

  - by rplantiko

  To see how binding Java objects to symbols in a dynamic language works, I wrote the following spike test, binding a java.lang.Integer to the symbol i to be changed in JavaScript: @Test public void bindToLocalVariable() throws ScriptException { javax.script.ScriptEngineManager sem = new javax.script.ScriptEngineManager(); javax.script.ScriptEngine engine = sem.getEngineByName("JavaScript"); Integer i = new Integer(17); engine.put( "i", i ); engine.eval( "i++;" ); // Now execute JavaScript assertEquals( 18, i.intValue() ); } Unfortunately, I get a failure. java.lang.AssertionError: expected:<18> but was:<17> JavaScript knows the symbol i (otherwise it would have thrown a ScriptException which is not the case), but the increment operation i++ is not performed on the original Integer object. Any explanations?

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• Why does my submit button fail to trigger Javascript MVC?

  - by user54197

  I have a simple code from a book and the code should display data from my controller in the "results" span. What am I missing? <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <script type="text/javascript"> $("form[action$='GetQuote']").submit(function() { $.post($(this).attr("action"), $(this).serialize(), function(response) { $("#results").html(response); }); return false; }); </script> <h2>Index</h2> <%using (Html.BeginForm("GetQuote","Stocks")) { %> Symbol: <%= Html.TextBox("symbol") %> <input type="submit" /> <span id="results"></span> <% } %> <p><i><%=DateTime.Now.ToLongTimeString() %></i></p> </asp:Content>

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• use callback function to report stack backtrace

  - by user353394

  Assume I have the following: typedef struct { char *name; char binding; int address; } Fn_Symbol //definition of function symbol static Fn_Symbol *fnSymbols; //array of function symbols in a file statc int total; //number of symbol functions in the array and file static void PrintBacktrace(int sigum, siginfo_t * siginfo, void *context) { printf("\nSignal received %d (%s)\n", signum, strsignal(signum)); const int eip_index = 14; void *eip = (void *)((struct ucontext *)context)->uc_mcontext.gregs[eip_index]; printf("Error at [%p] %s (+0x%x), eip, fnName, offset from start); //????? exit(0); } I have this so far, but what is the best way using the fnSymbols static global pointer to identify the function where the error occured and then back trace through the stack to identify each calling function by address, name, and offset?

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• dynamic memory error [closed]

  - by gcc

  /usr/bin/ld: warning: cannot find entry symbol rrors; defaulting to 000000000040 0520 meaning of the that error

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• Backtracking infinite loop

  - by Greenhorn

  This is Exercise 28.1.2 from HtDP. I've successfully implemented the neighbors function and all test cases pass. (define Graph (list (list 'A (list 'B 'E)) (list 'B (list 'E 'F)) (list 'C (list 'D)) (list 'D empty) (list 'E (list 'C 'F)) (list 'F (list 'D 'G)) (list 'G empty))) (define (first-line n alist) (cond [(symbol=? (first alist) n) alist] [else empty])) ;; returns empty if node is not in graph (define (neighbors n g) (cond [(empty? g) empty] [(cons? (first g)) (cond [(symbol=? (first (first g)) n) (first-line n (first g))] [else (neighbors n (rest g))])])) ; test cases (equal? (neighbors 'A Graph) (list 'A (list 'B 'E))) (equal? (neighbors 'B Graph) (list 'B (list 'E 'F))) (equal? (neighbors 'C Graph) (list 'C (list 'D))) (equal? (neighbors 'D Graph) (list 'D empty)) (equal? (neighbors 'E Graph) (list 'E (list 'C 'F))) (equal? (neighbors 'F Graph) (list 'F (list 'D 'G))) (equal? (neighbors 'G Graph) (list 'G empty)) (equal? (neighbors 'H Graph) empty) The problem comes when I copy-paste the code from Figure 77 of the text. It is supposed to determine whether a destination node is reachable from an origin node. However it appears that the code goes into an infinite loop except for the most trivial case where the origin and destination nodes are the same. ;; find-route : node node graph -> (listof node) or false ;; to create a path from origination to destination in G ;; if there is no path, the function produces false (define (find-route origination destination G) (cond [(symbol=? origination destination) (list destination)] [else (local ((define possible-route (find-route/list (neighbors origination G) destination G))) (cond [(boolean? possible-route) false] [else (cons origination possible-route)]))])) ;; find-route/list : (listof node) node graph -> (listof node) or false ;; to create a path from some node on lo-Os to D ;; if there is no path, the function produces false (define (find-route/list lo-Os D G) (cond [(empty? lo-Os) false] [else (local ((define possible-route (find-route (first lo-Os) D G))) (cond [(boolean? possible-route) (find-route/list (rest lo-Os) D G)] [else possible-route]))])) Does the problem lie in my code? Thank you.

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