It is mentioned in the environment
The following variables in the environment mention `a'
x :: a -> Int
- In an expression with expected type: forall a1.
- {Eq a1} =>
- a1 -> Int
+ In an expression with expected type:
+ forall a1. (Eq a1) => a1 -> Int
In an expression with a type signature:
x :: forall a. (Eq a) => a -> Int
-
-
Compilation had errors