Patterns which need 'signatures' end up with excess linebreak

[kozross]

Problem

When using patterns which require 'signatures', hindent forces there to be a line break between the 'signature' and the 'definition'. This is a little awkward; ideally, it should mirror functions.

• I checked the issue tracker for existing issues about this problem.
• I'm using the latest version of hindent.

Input haskell

pattern Atom :: Bool -> Word64 -> AtomP
pattern Atom x y <- (view -> Just (x, y))

Expected output haskell

pattern Atom :: Bool -> Word64 -> AtomP
pattern Atom x y <- (view -> Just (x, y))

Actual output haskell

pattern Atom :: Bool -> Word64 -> AtomP

pattern Atom x y <- (view -> Just (x, y))