I've been trying to use the new operators for AST Node type conversion 
without rewrite rules.

Attempt (doesn't work for me):

between_number:
   : number DASH<BETWEEN>^ number
   ;

Works:

between_number:
   : n1=number DASH n2=number -> ^(BETWEEN $n1 $n2)
   ;

Am I perhaps missing something related to implicit lists (since `number` 
appears twice)?



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