There appears to be a missing gerund form for monadic }.  Basically to make a 
tacit version of this:

4 : 'x}y'

 0 1 (4 : 'x}y') 1 1 ,: 3 4 
1 4 


I'd suggest this:

  0 1 ([:`[`])} 1 1 ,: 3 4 
|domain error 


but is there already a trick for a tacit version?
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