* module/language/c99/compiler.mes (ident->size, expr->size): New function.
(expr->accu): Use them for ++,--,add, sub.
(i386:type-alist): Set void size to 1.
* scaffold/tests/71-struct-array.c (test):
* scaffold/tests/76-pointer-arithmetic.c: Test it.
* make.scm (add-scaffold-test): Build it.
