PATCH: PR objc/18408 (but really a gimplifier fix)

[Jason Merrill]

On Thu, 11 Nov 2004 17:34:20 -0800, Ziemowit Laski <zlaski@apple.com> wrote:

> The gimplification process involves stripping useless (to the back-end --
> ObjC does need them!) type conversions, such as NOP_EXPRs.  This can be a
> problem if the NOP_EXPR in question is the argument of an INDIRECT_REF
> (e.g., '(*(List_linked*)collection).firstLink'); once the NOP_EXPR is
> removed, the INDIRECT_REF now has a type that is inconsistent with that of
> its (new) operand, leading to an assert failure later on.

Why is this conversion considered useless (and thus stripped)?  List and
List_linked certainly seem like different types to me.

Jason