Idris - Use implicit variable inside function -

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How can we use an inherent variable inside a function? Reducing the simplest possible case, it is possible that: dim: vect n -> Without error, net slow vec = n

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  while interpreting the right hand of the representative: no such variable n   
 Is there a way to use values ​​from inside? Or is it like asking for  n  inside  sin n ?  
 In this case, is it possible to prove that  Vect  is a "bijection" and can recover the variable from there?   
 
 
 Actually there is no such variable  n  because it is surrounded by pattern matching is not.  
 You obviously need to bring the underlying variable in the scope:  
  dim: vector no -> gt; Net Dame (NIT) vec = n   
 It is possible to see them in the IDRRL:  
  *> : Setsplicats * & gt; Set: Tee Dive Main .Dem: {n: Prelide. met. Net} - & gt; {A: type} - & gt; (__P__Rarg: Prelude.Wate. Search A) - & gt; Prelude.Nat.Nat

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