Re: Proposal to deprecate and then drop fromJust

Michael and I came up with an approach of using a convention in mono-traversable where any partial function has the postfix `Ex`, which stands for (throws a pure) Exception. So there is a `headEx` and `tailEx` function. This is a very light-weight solution although it is certainly easy for someone to ignore a new naming convention. The automated warning stuff seems promising! On Tue, Feb 24, 2015 at 7:14 AM, Gregory Collins wrote:

On Mon, Feb 23, 2015 at 10:19 PM, Chris Allen wrote:

...

Just a quick look on Github, filtering for uses of fromJust rather than re-declarations (mostly), shows 9,418 uses. ... Searching for imports of Data.Maybe alone come to 19,985, indicating that at least ~half of the time people import Data.Maybe, they're using fromJust.

Are you guys crazy?! I don't like partial functions either, but forget the -1, I vote to nuke this thread from orbit.

I'm +1 to adding warning pragmas to the prelude's partial functions, however.

G -- Gregory Collins

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