[Haskell-cafe] Error Monad and strings

[Gerald Gutierrez]

Reading the Control.Monad.Error documentation, I see that the Error class
has noMsg and strMsg as its only two functions.

Now, I understand that you can define your own Error instances such as in
example 1 of the documentation, so why the need to always support strings
via noMsg/strMsg ? What uses these? And if in my code, I will never throw an
error with a string, am I supposed to implement these functions and then
ignore them?
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