forward references in typedefs

[John Cowan]

In article <1989Jul20.152935.14872 at utzoo.uucp> henry at utzoo.uucp (Henry Spencer) writes:
>...it's very unusual for different
>struct pointers to have different representations, so the compiler knows
>how big a pointer it's got even if it's not quite sure what it points to.)

For "very unusual" read "illegal".  As someone (Chris Torek?) said earlier
in this group, "all 'struct' pointers must 'smell' the same."  If this
behavior is not guaranteed, forward references to structs would be 
unimplementable in one pass.

Ufcawss, if you talk to the people who wrote VMS C, they'll tell you that
all one-pass implementations of C are unacceptable!  (This has something to
do with generating good code for the 'switch' statement.)
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