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gbrandl  committed 56eaa68

Add note about empty regex.

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File docs/src/lexerdevelopment.txt

   by putting values into the stack that don't exist in the token map. Also
   removing ``'root'`` from the stack can result in strange errors!
 
+- An empty regex at the end of a state list, combined with ``'#pop'``, can
+  act as a return point from a state that doesn't have a clear end marker.
+
 
 Using multiple lexers
 =====================