chrisdone/structured-haskell-mode — pull request #47 by ExternalReality (2014-02-04 03:22:41+00:00)
Title: Add shm/modify-type-constraint

Add new type constraints to a selected 'full' type signature node.

This is sort of a work around for not being able to select the relevant portion of a type constraint node. So simply select the whole type signature and invoke the command.