Declarations after statements in front ends

[Robert Dewar]

Zack Weinberg wrote:

> I would go even farther, and say that *all* front ends must be coded
> in ISO C90, and we should be compiling everything with -pedantic.

I don't see the need for this restriction. It seems to me that only
the C compiler need obey this rule. I see no reason why other front
ends cannot use GNU C extensions. So Zack, can you give your
reasoning here. To me, the restriction in non-C front ends seems
unnecessary and unhelpful.