Feature request: put parens around match inside type annotation

[ceastlund]

The following code:

((match foo with | Bar -> bar | Baz -> baz) : string)

Is now formatted like this:

(match foo with
 | Bar -> bar
 | Baz -> baz
  : string)

It used to leave the inner parentheses intact, to clearly associate the type annotation with match instead of baz.

On its own, the new code would probably be fine, as the indentation makes the association pretty clear. However, with our current use of ocp-indent, the : string gets indented flush with baz. So until we're ready to ditch ocp-indent, we'd like to keep the extra parentheses.

Edit: I only checked this with --profile=janestreet, and I'm only requesting the change in that profile.