Re: Proposal: Add IsString instance for (Maybe a) to base

Simon Hengel writes:

Hi, what about adding

instance IsString a => IsString (Maybe a) where fromString = Just . fromString

It makes specifying optional String/Text/... values more convenient. Here is an example that uses System.Process.shell:

Use

shell "ls -l" { cwd = "/home/me" }

instead of

shell "ls -l" { cwd = Just "/home/me" }

I'm not yet sure how essential it is. But I somehow can't see any issues with it. So why not?

-1. It's called *IsString*. -- lelf