[Bug c/86668] New: mixing ansi prototype with K&R definition

[amrosalem820 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86668

            Bug ID: 86668
           Summary: mixing ansi prototype with K&R definition
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: amrosalem820 at gmail dot com
  Target Milestone: ---

I mix ansi prototype with K&R definition ,, I know it will be an error if the
parameters of the ansi form aren't compatible with the default promotions ..

 my problem is when I wrote the ansi prototype outside main it compiled well !! 

//this program compiled well 
int fun (float x) ;
int main ()
{
 fun (5.0);
}

int fun (x)
float x ;
{
      return x ;
}


but when I wrote it inside main it gave an error as expected 

//this program didn't compile and gave error "conflicting types for fun" 


int main ()
{
int fun (float x) ;
 fun (5.0 );
}

int fun (x)
float x ;
{
      return x ;
}

why there is difference between writing prototype inside main or outside main
in this case ?