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#include <stdio.h>
#include <stddef.h>
 
template< int base_offs > struct pin {
  int y1;
};
 
struct wrap {
  int x1;
  char x2;
 
  char base1[0];
  pin< offsetof(wrap,base1) > r3;
 
  char base2[0];
  pin< offsetof(wrap,base2) > r4;
};
 
 
 
 

In file included from prog.cpp:2:0:
prog.cpp:13:8: error: invalid use of incomplete type ‘struct wrap’
   pin< offsetof(wrap,base1) > r3;
        ^
prog.cpp:8:8: error: forward declaration of ‘struct wrap’
 struct wrap {
        ^
prog.cpp:13:29: error: template argument 1 is invalid
   pin< offsetof(wrap,base1) > r3;
                             ^
In file included from prog.cpp:2:0:
prog.cpp:16:8: error: invalid use of incomplete type ‘struct wrap’
   pin< offsetof(wrap,base2) > r4;
        ^
prog.cpp:8:8: error: forward declaration of ‘struct wrap’
 struct wrap {
        ^
prog.cpp:16:29: error: template argument 1 is invalid
   pin< offsetof(wrap,base2) > r4;
                             ^

Standard output is empty