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myReverse : Vect n elem -> Vect n elem | |
myReverse [] = [] | |
myReverse {n = S k} (x :: xs) | |
= let result = myReverse xs ++ [x] in | |
rewrite plusCommutative 1 k in ?myReverse_rhs_2 | |
{- my holes | |
elem : Type | |
k : Nat | |
x : elem | |
xs : Vect k elem | |
result : Vect (k + 1) elem | |
_rewrite_rule : fromInteger 1 + k = k + fromInteger 1 | |
----------------------------------------------------------------------------------- | |
myReverse_rhs_2 : (\replaced => Vect replaced elem) (plus k (fromInteger 1)) | |
-} | |
{- copied from textbook page 224 | |
elem : Type | |
k : Nat | |
x : elem | |
xs : Vect k elem | |
result : Vect (plus k 1) elem | |
_rewrite_rule : plus k 1 = S k | |
-------------------------------------- | |
myReverse_rhs_2 : Vect (plus k 1) elem | |
-} |
I'm also using Emacs idris-mode 20171212.759
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I'm using Idris Version 1.1.1