Question: I would like to define the following function: This function takes one argument and returns itself ignoring the argument. Just writing it like this in ghci gives me the following type error: If the function would use this argument ...
Question: What is the difference between IO (a) and IO a in Haskell? For instance: IO (String) vs IO String IO (Int) vs IO Int Most books I’ve seen wrap a type in parentheses before putting it after IO, but ...
Question: According the Rustonomicon, &mut T is invariant over T. How can the following code compile when &mut (str, str) is not a subtype of &mut (T, T)? The relevant chapter is here The Rustonomicon implies that you can call ...