me too..

  λ let (_,(a:_)) = (10,"abc") in a
  can't find file: Imports.hs
  λ let (_,(a:_)) = (10,"abc") in a
  'a'
  :: Char

yep, you are not the only one that had that problem

λ foldr (:) [] [1,2,3]

:: Num a => [a]

λ foldr (:) [] [1,2,3]

[1,2,3] :: Num a => [a]

I had similar issues with the first expression, sometimes when executing a new expression I also had to type it twice to get the answer.