I'm likely doing something silly, but I just don't see the mistake:  

 (-: a)+b++:c [ 'a b c' =. ;/ 1 2 3
8.5
   t =. 3 : ' ( -: a) + b + (+: c) [ 'a b c' =. y'
|syntax error
|   (-:a)    +b+(+:c)[

is it trying to form a train with [ as the rh most verb?
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