FSO (FileSystemObject) Move folder in itself

Question

does anyone know how to recognize the error, when an Folder will be moved in itself?

with the FSO.moveFolder no Problem to move them:

fso.MoveFolder("C:\\Temp\\folder1", "C:\\Temp\\folder2\\");  

but whats happen when i try to move

fso.MoveFolder("C:\\Temp\\folder1", "C:\\Temp\\folder1\\");

in the console i will get an error, thats OK, but how recognize ist, lets say like the "FolderExists Method "

if (fso.FolderExists("C:\\Temp\\myFolder")) {  
    document.write("myFolder exists.");  
}  
else {  
    document.write("myFolder does not exist.");  
}