Question: Invalid Subscript selector - Maple 14

Hello

The following maple command returns an error in Maple 14 (internal error in Typesetting ... "invalid subscript selector") but not in Maple 2017.   

f:=(l::list)-> eval([y,y*z-x,-15*x*y-x*z-x],[x,y,z]=~l):

What did I miss?

 

Many thanks

 

Ed

 

 

 

 

 

 

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