Bump happstack dependency
Draft a bit
Use an underlying tree
Draft, take deep embedding to the next level
eval works a bit
Play with transformations
Annotate errors
Bit easier testing
Relax Monoid constraint a bit
Add choice function
lookupForm, optimize in transform
A more abstract Tree
Revert "A more abstract Tree"

This reverts commit 09c26228bfe8f9f216fbef7b272c60c29f0eeef7.
Add a View type
Remove probably unneeded `i` type parm
Could we implement a view like this?
Add getForm, postForm
More view utils
Nice query function, add inputSelect
Extracting errors