Returning an illegal value from a function shows no visible error

[expositionrabbit]

Function Test() as Integer
   Return "This is no integer"
End Function

Print Test()

The editor shows no error when pasting in this code. However, it correctly refuses to run it. Calling ebeditor.runCode() from the browser console shows Error: Failed to cast "String" to "Number", but the editor does not display this in any way.