haskell-suite/haskell-src-exts — pull request #52 by rhymoid (2013-09-20 12:02:59+00:00)
Title: Eliminate PatBind's optional type argument.

This patch moves the optional type signature from the constructor PatBind to its pattern. So rather than

PatBind l p (Just ty) rhs binds

the parser will now yield

PatBind l (PatTypeSig l' p ty) rhs binds