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#include <stdio.h>
 
void func(struct { int x; } p)
{
    printf("%i\n", p.x);
}
 
int main(void) {
	func((struct { int x; }){8});
	return 0;
}
 

prog.c:3:11: warning: anonymous struct declared inside parameter list will not be visible outside of this definition or declaration
 void func(struct { int x; } p)
           ^~~~~~
prog.c: In function ‘main’:
prog.c:9:26: error: incompatible type for argument 1 of ‘func’
  func((struct { int x; }){8});
                          ^~~
prog.c:3:29: note: expected ‘struct <anonymous>’ but argument is of type ‘struct <anonymous>’
 void func(struct { int x; } p)
           ~~~~~~~~~~~~~~~~~~^

Standard output is empty