Migration to Experimental

[parsonsmatt]

This should occur in multiple phases:

esqueleto-3.5

#249. Introduce Database.Esqueleto.Legacy, warn on Database.Esqueleto, and point folks to Experimental syntax as new default.

esqueleto-3.6

This release ended up having enough going on that I want to do another breaking change, so I am delaying the default changing to 3.7.

esqueleto-3.7

#250. Database.Esqueleto officially points to experimental syntax. Database.Esqueleto.Legacy and Database.Esqueleto.Experimental get warnings, noting that they'll be deleted in the next version.

esqueleto-4.0

Legacy syntax is completely deleted.

[Philonous]

Is there a plan how to deal with legacy code that relies on the old syntax? I have inherited a significant code base written in the old style and it's hardly feasible to rewrite it all.

[parsonsmatt]

I've laid out the planned version releases here. If you need the old syntax, then you'll want to depend on esqueleto < 4.

I can create a branch at esqueleto-3.6 that someone else can use for backporting fixes if they want to continue to maintain the legacy style.