UnusedName Warning

Example

module UnusedNameExample where

plus :: Int -> Int -> Int
plus x y = y -- Name x was introduced but not used.

ignore :: forall a. a -> Unit
ignore value = unit -- Name value was introduced but not used.

Cause

This warning occurs when a name is introduced but is not used anywhere.

PureScript warns in this case because it could indicate a bug due to a value not being referenced where it should be.

Fix

If the unused name was unintentional, make use of it to fix the warning:

plus :: Int -> Int -> Int
plus x y = x + y

If the unused name is intentional, mark the name as unused by prefixing it with a _:

ignore :: forall a. a -> Unit
ignore _value = unit

Notes