Patch for PR c/12373

[Zack Weinberg]

Eric Botcazou <ebotcazou@libertysurf.fr> writes:

> Maybe.  You would have to take into account the criticality and the target 
> milestone.  But I think it is primarily the responsability of the assignee 
> to unassign PRs he doesn't plan to work on.

In this case I thought (incorrectly) that this bug required the big
c-decl rewrite to fix, so I thought I was working on it.

zw